METHOD FOR PREPARING NANO CARBON DIOXIDE CAPTURE AGENT AND APPLICATION OF SAME

Abstract

A method for preparing a nano carbon dioxide agent and an application of the agent are disclosed. The method takes cationic surfactant modified bentonite as a carrier, and the CO.sub.2 nano agent prepared by loading cationic surfactant modified chitosan, graphene oxide and organic alkali modified hydrotalcite has the photocatalytic effect of nano materials, which can enhance photosynthesis, increase photosynthetic rate, inhibit light respiration at night, synthesize chlorophyll for crop growth, accumulate three essential elements of carbon, hydrogen and oxygen for crop growth, effectively absorb, synthesize and transform organic components such as nitrogen, phosphorus and potassium in soil, fully promote the gestation, growth and maturity of crops, and increases production and income. The CO.sub.2 capture agent of the disclosure can be used for both facility crops and field crops, and the CO2 capture agent under normal temperature and pressure has wide application.

Claims

1. A method for preparing a nano carbon dioxide capture agent, comprising: step (1), preparing an organic modified mineral soil solution: dissolving a mineral soil and a cationic surfactant in deionized water respectively, adding into a reaction kettle, heating and stirring, and adjusting pH to obtain an organic modified mineral soil solution; wherein the mass ratio of the mineral soil to the cationic surfactant is 3:1-1:1; step (2), preparing a modified chitosan solution: dissolving a chitosan in an acetic acid, adding the acetic aid into a reaction kettle, stirring and dissolving, dripping a cationic surfactant until the chitosan is completely dissolved, and adjusting pH to obtain the modified chitosan solution, wherein the mass ratio of the chitosan to the cationic surfactant is 9:1-11:1; step (3), dripping the modified chitosan solution into the organic modified mineral soil solution under a stirring condition, stirring for homogenization and ultrasonically dispersing, adjusting pH value to obtain an organic modified mineral soil loaded modified chitosan solution, filtering, drying and grinding to nanometer level, wherein the mass ratio of the modified chitosan solution to the organic modified mineral soil solution is 0.05-0.1; step (4), adding a graphene oxide into deionized water, stirring and dispersing to obtain a graphene oxide dispersion; filtering the organic modified mineral soil loaded modified chitosan solution obtained in the step (3) to nano level, adding the obtained organic modified mineral soil loaded modified chitosan nano level powder into the graphene oxide dispersion, reacting in a reactor, filtering, drying and grinding to nano level powder to obtain an organic modified mineral soil loaded modified chitosan and graphene oxide powder; wherein the mass ratio of the organic modified mineral soil loaded modified chitosan nano powder to the graphene oxide is 8:1-15:1; step (5), dispersing a hydrotalcite in deionized water for full dissolution, adding the nano powder prepared in the step (4) slowly, adjusting pH until a precipitation of the mixed solution occurs, and uniformly dispersing by magnetic stirring to obtain a nano carbon dioxide capture agent, wherein the mass ratio of the nano powder to the hydrotalcite is 2:1-4:1.

2. The method of claim 1, wherein the cationic surfactant is one or more than two of dodecyl trimethyl ammonium bromide (DTAB), polydimethyldiallyl ammonium chloride (PDMDAAC), dodecyl dimethyl benzyl ammonium chloride, cetyl trimethyl ammonium chloride (CTAC), cetyl trimethyl ammonium bromide (CTAB), tetradecyl trimethyl ammonium bromide, octadecyl trimethyl ammonium bromide (CTMAB) and octadecyl trimethyl ammonium chloride (OTAC).

3. The method of claim 1, wherein a pH regulator for adjusting pH in the step (1) to (3) is an organic amine or an organic alcohol amine; in the step (5), K2CO3 or KOH is adopted for the pH adjustment.

4. The method of claim 3, wherein the organic amine or the organic alcohol amine is one or more than two of diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylene pentamine (TEPA), pentaethylene hexamine (PEHA), n-methyl-1, 3-diaminopropane (MAPA) and n, n-. 4-pyridine methylamine, N′-(pyridine-4-ylmethyl) ethane-1,2-diamine, AMP-95, ethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), tertiary amine N-methyl glycol amine (MDEA), N, N-diethylethanolamine (DEEA) and N-ethylethanolamine.

5. The method of claim 1, wherein the step (5) is prepared by hydrotalcite co-precipitation method, comprising: mixing and dispersing an Na2CO3, a K2CO3, a Mg(NO3)2.6H2O and an Al(NO3)3.9H2O uniformly at a ratio of 3.5:0.5:0.5:1.2:1.0, and dissolving at a ratio of 100 g/L in deionized water.

6. The method of claim 1, wherein the mineral soil is one or more than two of a rare earth, a diatomite, an attapulgite, a bentonite, a kaolin or a montmorillonite, and the fineness reaches nanometer level; the mineral soil and the cationic surfactant are respectively dissolved in deionized water with a concentration of 10-15 g/l; in the reaction kettle, the stirring speed is 400-600 r/min, and the temperature is 60-80° C., and the mixture is heated and stirred for 1-3 hours.

7. The method of claim 1, wherein in the step (2), the mass concentration of the acetic acid is 3-8%, and the mass concentration of the chitosan dissolved in the acetic acid is 50-200 g/l; the stirring speed in the reaction kettle is 400-600 r/min, and the chitosan is completely dissolved by heating and stirring at 50-80° C.

8. The method of claim 1, wherein in the step (3), dripping the modified chitosan solution into the organic modified mineral soil solution at a stirring speed of 400-600 r/min and a temperature of 50-80° C., stirring for 2 hours, then introducing into a homogenizer, and uniformly dispersing for 6-15 hours at a rotating speed of 12,000-16,000 r/min, adjusting pH to 7.5-8.2 to obtain an organic modified mineral soil loaded modified chitosan solution, filtering, drying at 80-120° C. for 1-2 hours, and introducing into a nano grinder for grinding to nanometer level; or in the step (4), the mass concentration of the graphene oxide dispersed in deionized water in the step (4) is 1-2 g/L, and ultrasonic dispersion is performed for 1.5-2.5 hours; in a microwave reactor, the microwave power is 800-1000 w and the microwave radiation time is 15-25 min; the drying is at 80-120° C. for 1-2 hours; the grinding time is 1-2 hours.

9. The method of claim 1, further comprising a pulverize step of transferring the nano carbon dioxide capture agent mixed solution obtained in the step (5) into a reaction kettle with a jacket, performing a hydrothermal reaction at 100-120° C. for 30-40 hours, fully washing with an absolute ethyl alcohol and deionized water, performing a suction filtration, freeze drying, and introducing into a nano grinder for grinding for 1-2 h to obtain a powdery nano composite product.

10. A nano carbon dioxide capture agent prepared by the method claim 1 as a fertilizer for enhancing plant photosynthesis or an application in a fertilizer for enhancing plant photosynthesis.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The principles and features of the present disclosure are described below in connection with the following embodiments, which are given to illustrate the disclosure and are not intended to limit the scope of the disclosure.

Embodiment 1

[0042] Method for preparing a nano carbon dioxide capture agent:

[0043] Step 1: dissolving in deionized water with a mass/volume ratio of 11 g/L according to a ratio of m (diatomite):m (dodecyl trimethyl ammonium bromide (DTAB))=3:1 respectively, adding into a reaction kettle with a heating jacket, heating and stirring at 80° C. for 1 h at a rotating speed of 600 r/min, and adjusting pH value to 8 with ethanolamine (MEA) to obtain dodecyl trimethyl ammonium bromide (DTAB) modified organic diatomite;

[0044] Step 2: dissolving a chitosan in an acetic acid (concentration: 5%) according to a certain proportion (mass/volume ratio: 100 g/L), adding into a reaction kettle with a heating jacket, at a rotating speed of 500 r/min, and heating and stirring at 60° C. for complete dissolution; according to the ratio of m (chitosan):m (dodecyl trimethyl ammonium bromide (DTAB)=9:1, at a rotating speed of 450 r/min, heating and stirring at 70° C. for 1 hour for complete dissolution, dripping an ethanolamine (MEA) until complete dissolution, and adjusting pH value to 8 with an ethanolamine (MEA) to obtain a dodecyl trimethyl ammonium bromide (DTAB) modified chitosan solution;

[0045] Step 3: according to the ratio of m (dodecyl trimethyl ammonium bromide (DTAB) modified chitosan solution):m (dodecyl trimethyl ammonium bromide (DTAB) modified diatomite solution) of 0.05:1, dripping the solution prepared in the second step into the solution prepared in the first step at the rotating speed of 500 r/min and the temperature of 70° C., stirring for 2 h, introducing into a homogenize, homogenizing and dispersing for 10 min at the rotating speed of 12000 r/min, introducing an ultrasonic dispersion for 5 min, using ethanolamine (MEA) to adjust pH value to 8 to obtain a dodecyl trimethyl ammonium bromide (DTAB) modified organic diatomite loaded dodecyl trimethyl ammonium bromide (DTAB) modified chitosan solution, performing suction filtration, drying at 100° C. for 1 h, introducing into a nano-grinder for grinding for 2 hours, and distributing the particle size distribution to nanoscale;

[0046] Step 4: filling the graphene oxide into a dispersion tank of distilled water according to a ratio (1.5 g/L), performing an ultrasonic dispersion for 2 hours to uniformly disperse, adding the powder with a ration of m (dodecyl trimethyl ammonium bromide (DTAB) modified organic diatomite loaded dodecyl trimethyl ammonium bromide (DTAB) modified chitosan solution:m (graphene oxide)=8:1 into the graphene oxide dispersion liquid, under the power of 900 w, microwave radiation for 20 min, adjusting pH value to 8 by using ethanolamine (MEA), suction filtering, drying at 100° C. for 1 h, introducing into a nano-grinder for grin for 1 h, a dodecyltrimethylammonium bromide (DTAB) modified organic diatomaceous earth loaded dodecyltrimethylammonium bromide (DTAB) modified chitosan and a graphene oxide powder were obtained.

[0047] Step 5: preparing a nano hydrotalcite by an improved known coprecipitation method, uniformly mixing and dispersing according to a ration of m (Na.sub.2CO.sub.3):m (K.sub.2CO.sub.3):m (Mg(NO.sub.3).sub.2.6H.sub.2O):m (Al(NO.sub.3).sub.3.9H.sub.2O)=3.5:0.5:1.2:1.0, dissolving in deionized water in a ratio of (100 g/L) at a rotating speed of 1000 r/min, and stirring for 2 hours to fully dissolve, slowly adding (m (dodecyl trimethyl ammonium bromide (DTAB) modified organic diatomite supported dodecyl trimethyl ammonium bromide (DTAB) modified chitosan, graphene oxide powder:m (hydrotalcite)) in a ratio of 2:1, then slowly dripping K.sub.2CO.sub.3 or KOH to adjust the pH to 9, and the mixed solution will appear to precipitate (pH=9.0), finally, continuously magnetically stirring for 2 h, introducing a homogenizer, and dispersing for 10 min at a rotation speed of 15000 r/min, and introducing ultrasonic dispersion for 5 min to obtain a uniformly dispersed nano mixed solution product; further, transferring the mixed solution to a jacketed reaction kettle, and the liquid product was obtained after hydrothermal reaction at 110° C. for 36 hours. Further, fully washing with absolute ethanol and deionized water, filtering with suction, freeze drying, and introducing into a nano-grinder for grinding for 2 h to obtain a powder nano-composite material product.

Embodiment 2

[0048] Method for preparing a nano carbon dioxide capture agent:

[0049] Step 1: dissolving in deionized water (mass/volume ratio: 14 g/L) according to a ratio of m (kaolin):m (octadecyl trimethyl ammonium bromide (CTMAB))=1:1:1 respectively, adding into a reaction kettle with a heating jacket, heating and stirring at 70° C. for 2 h at a rotating speed of 500 r/min, and adjusting pH value to 8 with diethanolamine (DEA) to obtain an octadecyl trimethyl ammonium bromide (CTMAB) modified organic kaolin;

[0050] Step 2: dissolving a chitosan in an acetic acid (concentration: 5%) according to a certain proportion (mass/volume ratio: 100 g/L), adding into a reaction kettle with a heating jacket, at a rotating speed of 500 r/min, and heating and stirring at 70° C. for complete dissolution; according to the ratio of m (chitosan):m (octadecyl trimethyl ammonium bromide (CTMAB))=11:1, at a rotating speed of 500 r/min, heating and stirring at 60° C. for complete dissolution, dripping an ethanolamine (MEA) until complete dissolution, and adjusting pH value to 8 with diethanolamine (DEA) to obtain a octadecyl trimethyl ammonium bromide (CTMAB) modified chitosan;

[0051] Step 3: according to the ratio of m (octadecyl trimethyl ammonium bromide (CTMAB) modified chitosan):m (octadecyl trimethyl ammonium bromide (CTMAB) modified organic kaolin) of 0.05:1, dripping the solution prepared in the step 2 into the solution prepared in the first step at the rotating speed of 500 r/min and the temperature of 70° C., stirring for 2 h, introducing into a homogenize, homogenizing and dispersing for 10 min at the rotating speed of 12000 r/min, introducing an ultrasonic dispersion for 5 min, using a diethanolamine (DEA) to adjust pH value to 8 to obtain a octadecyl trimethyl ammonium bromide (CTMAB) modified organic kaolin loaded octadecyl trimethyl ammonium bromide (CTMAB) modified chitosan solution, performing suction filtration, drying at 100° C. for 1 h, introducing into a nano-grinder for grinding for 2 hours, and distributing the particle size distribution to nanoscale;

[0052] Step 4: dispersing the graphene oxide with distilled water according to a ratio (1.5 g/L), performing an ultrasonic dispersion for 2 h to uniformly disperse, adding the powder with a ration of m (octadecyl trimethyl ammonium bromide (CTMAB) modified organic diatomite loaded octadecyl trimethyl ammonium bromide (CTMAB) modified chitosan solution:m (graphene oxide)=8:1 into the graphene oxide dispersion liquid, under the power of 900 w, microwave radiation for 20 min, adjusting pH value to 8 by using diethanolamine (DEA), suction filtering, drying at 100° C. for 1 h, introducing into a nano-grinder for grin for 1 h, a octadecyl trimethyl ammonium bromide (CTMAB) modified organic diatomaceous earth loaded octadecyl trimethyl ammonium bromide (CTMAB) modified chitosan and a graphene oxide powder were obtained.

[0053] Step 5: preparing a nano hydrotalcite by an improved known coprecipitation method, uniformly mixing and dispersing according to a ration of m (Na.sub.2CO.sub.3):m (K.sub.2CO.sub.3):m (Mg(NO.sub.3).sub.2.6H.sub.2O):m (Al(NO.sub.3).sub.3.9H.sub.2O)=3.5:0.5:1.2:1.0, dissolving in deionized water in a ratio of (100 g/L) at a rotating speed of 1000 r/min, and stirring for 2 h to fully dissolve, slowly adding (m octadecyl trimethyl ammonium bromide (CTMAB) modified organic diatomite supported Octadecyl trimethyl ammonium bromide (CTMAB) modified chitosan, graphene oxide powder:m (hydrotalcite)) in a ratio of 1:2.5, then slowly dripping K.sub.2CO.sub.3 or KOH to adjust the pH to 9, and the mixed solution will appear to precipitate (pH=9.0), finally, continuously magnetically stirring for 2 h, introducing a homogenizer, and dispersing for 10 min at a rotation speed of 15000 r/min, and introducing ultrasonic dispersion for 5 min to obtain a uniformly dispersed nano mixed solution product; further, transferring the mixed solution to a jacketed reaction kettle, and the liquid product was obtained after hydrothermal reaction at 110° C. for 36 h. Further, fully washing with absolute ethanol and deionized water, filtering with suction, freeze drying, and introducing into a nano-grinder for grinding for 2 h to obtain a powder nano-composite material product.

Embodiment 3

[0054] Method for preparing a nano carbon dioxide capture agent:

[0055] Step 1: dissolving in deionized water (mass/volume ratio: 12 g/L) according to a ratio of m(bentonite):m(cetyl trimethyl ammonium bromide (CTAB))=2:1 respectively, adding into a reaction kettle with a heating jacket, heating and stirring at 70° C. for 2 h at a rotating speed of 500 r/min, and adjusting pH value to 8 with tetraethylenepentaamine (TEPA) to obtain cetyl trimethyl ammonium bromide (CTAB) modified organobentonite;

[0056] Step 2: dissolving a chitosan in an acetic acid (concentration: 5%) according to a certain proportion (mass/volume ratio: 100 g/L), adding into a reaction kettle with a heating jacket, at a rotating speed of 500 r/min, and heating and stirring at 70° C. for complete dissolution; according to the ratio of m (chitosan):m (cetyl trimethyl ammonium bromide (CTAB))=10:1, at a rotating speed of 500 r/min, heating and stirring at 60° C. for complete dissolution, dripping an cetyl trimethyl ammonium bromide (CTAB) until complete dissolution, and adjusting pH value to 8 with tetraethylene pentamine (TEPA) to obtain a cetyl trimethyl ammonium bromide (CTAB) modified chitosan;

[0057] Step 3: according to the ratio of m (modified chitosan):m (modified organic bentonite) of 0.1, dripping the solution prepared in the step 2 into the solution prepared in the first step at the rotating speed of 500 r/min and the temperature of 70° C., stirring for 2 h, introducing into a homogenize, homogenizing and dispersing for 10 min at the rotating speed of 15000 r/min, introducing an ultrasonic dispersion for 10 min, using a tetraethylene pentamine (TEPA) to adjust pH value to 8 to obtain a cetyl trimethyl ammonium bromide (CTAB) modified organic bentonite loaded modified chitosan solution, performing suction filtration, drying at 100° C. for 1 h, introducing into a nano-grinder for grinding for 2 h, and distributing the particle size distribution to nanoscale;

[0058] Step 4: dispersing the graphene oxide with distilled water according to a ratio (1.5 g/L), performing an ultrasonic dispersion for 2 h to uniformly disperse, adding the powder with a ration of m (modified organobentonite load modified chitosan):m (graphene oxide)=11:1 into the graphene oxide dispersion liquid, under the power of 900 w, microwave radiation for 20 min, adjusting pH value to 8 by using tetraethylene pentamine (TEPA), suction filtering, drying at 100° C. for 1 h, introducing into a nano-grinder for grin for 1 h, a modified organic bentonite load modified chitosan and a graphene oxide powder were obtained.

[0059] Step 5: preparing a nano hydrotalcite by an improved known coprecipitation method, uniformly mixing and dispersing according to a ration of m (Na.sub.2CO.sub.3):m (K.sub.2CO.sub.3):m (Mg(NO.sub.3).sub.2.6H.sub.2O):m (Al(NO.sub.3).sub.3.9H.sub.2O)=3.5:0.5:1.2:1.0, dissolving in deionized water in a ratio of (100 g/L) at a rotating speed of 1000 r/min, and stirring for 2 h to fully dissolve, slowly adding (m (modified organobentonite loaded modified chitosan, graphene oxide powder:m(hydrotalcite))=3:1, then slowly dripping K.sub.2CO.sub.3 or KOH to adjust the pH to 9, and the mixed solution will appear to precipitate (pH=9.0), finally, continuously magnetically stirring for 2 h, introducing a homogenizer, and dispersing for 10 min at a rotation speed of 15000 r/min, and introducing ultrasonic dispersion for 5 min to obtain a uniformly dispersed nano mixed solution product; further, transferring the mixed solution to a jacketed reaction kettle, and the liquid product was obtained after hydrothermal reaction at 110° C. for 36 h. Further, fully washing with absolute ethanol and deionized water, filtering with suction, freeze drying, and introducing into a nano-grinder for grinding for 2 h to obtain a powder nano-composite material product.

Embodiment 4

[0060] Method for preparing a nano carbon dioxide capture agent:

[0061] Step 1: dissolving in deionized water (mass/volume ratio: 12 g/L) according to a ratio of m (attapulgite):m (cetyltrimethylammonium chloride (CTAC))=1.5:1 respectively, adding into a reaction kettle with a heating jacket, heating and stirring at 70° C. for 2 h at a rotating speed of 500 r/min, and adjusting pH value to 8 with triethanolamine (TEA) to obtain hexadecyl trimethyl ammonium chloride (CTAC) modified organic attapulgite;

[0062] Step 2: dissolving a chitosan in an acetic acid (concentration: 5%) according to a certain proportion (mass/volume ratio: 100 g/L), adding into a reaction kettle with a heating jacket, at a rotating speed of 500 r/min, and heating and stirring at 60° C. for complete dissolution; according to the ratio of m (chitosan):m (cetyl trimethyl ammonium chloride (CTAC))=9.5:1, at a rotating speed of 500 r/min, heating and stirring at 60° C. for complete dissolution, dripping an cetyl trimethyl ammonium chloride (CTAC) until complete dissolution, and adjusting pH value to 8 with triethanolamine (TEA) to obtain a cetyl trimethyl ammonium chloride (CTAC) modified chitosan;

[0063] Step 3: according to the ratio of m (modified chitosan):m (modified organic attapulgite)=0.09:1, dripping the solution prepared in the step 2 into the solution prepared in the step 1 at the rotating speed of 500 r/min and the temperature of 70° C., stirring for 2 h, introducing into a homogenize, homogenizing and dispersing for 10 min at the rotating speed of 15000 r/min, introducing an ultrasonic dispersion for 5 min, using a triethanolamine (TEA) to adjust pH value to 8 to obtain a modified organic attapulgite load modified chitosan solution, performing a suction filtration, drying at 100° C. for 1 h, introducing into a nano-grinder for grinding for 2 h, and distributing the particle size distribution to nanoscale;

[0064] Step 4: dispersing the graphene oxide with distilled water according to a ratio (1.5 g/L), performing an ultrasonic dispersion for 2 h to uniformly disperse, adding the powder with a ration of m (modified organic attapulgite loaded modified chitosan):m (graphene oxide)=15:1 into the graphene oxide dispersion liquid, under the power of 900 w, microwave radiation for 20 min, adjusting pH value to 8 by using tetraethylene pentamine (TEPA), suction filtering, drying at 100° C. for 1 h, introducing into a nano-grinder for grin for 1 h, a modified organic attapulgite loaded modified chitosan and a graphene oxide powder were obtained.

[0065] Step 5: preparing a nano hydrotalcite by an improved known coprecipitation method, uniformly mixing and dispersing according to a ration of m (Na.sub.2CO.sub.3):m (K.sub.2CO.sub.3):m (Mg(NO.sub.3).sub.2.6H.sub.2O):m (Al(NO.sub.3).sub.3.9H.sub.2O)=3.5:0.5:1.2:1.0, dissolving in deionized water in a ratio of (100 g/L) at a rotating speed of 1000 r/min, and stirring for 2 h to fully dissolve, slowly adding (m(modified organic attapulgite loaded modified chitosan, graphene oxide powder:m(hydrotalcite))=4:1, then slowly dripping K.sub.2CO.sub.3 or KOH to adjust the pH to 9, and the mixed solution will appear to precipitate (pH=9.0), finally, continuously magnetically stirring for 2 h, introducing a homogenizer, and dispersing for 10 min at a rotation speed of 15000 r/min, and introducing ultrasonic dispersion for 5 min to obtain a uniformly dispersed nano mixed solution product; further, transferring the mixed solution to a jacketed reaction kettle, and the liquid product was obtained after hydrothermal reaction at 110° C. for 36 h. Further, fully washing with absolute ethanol and deionized water, filtering with suction, freeze drying, and introducing into a nano-grinder for grinding for 2 h to obtain a powder nano-composite material product.

Embodiment 5

[0066] Method for preparing a nano carbon dioxide capture agent:

[0067] Step 1: dissolving in deionized water (mass/volume ratio: 12 g/L) according to a ratio of m(rare earth):m (polydimethyldiallylammonium chloride (PDMDAAC))=2.5:1 respectively, adding into a reaction kettle with a heating jacket, heating and stirring at 70° C. for 2 h at a rotating speed of 500 r/min, and adjusting pH value to 8 with diethylenetriamine (DETA) to obtain polydimethyldiallylammonium chloride (PDMDAAC) modified organic rare earth;

[0068] Step 2: dissolving a chitosan in an acetic acid (concentration: 5%) according to a certain proportion (mass/volume ratio: 100 g/L), adding into a reaction kettle with a heating jacket, at a rotating speed of 500 r/min, and heating and stirring at 60° C. for complete dissolution; according to the ratio of m (chitosan):m(polydimethyldiallylammonium chloride (PDMDAAC))=10.5:1, at a rotating speed of 500 r/min, heating and stirring at 60° C. for complete dissolution, dripping an polydimethyldiallylammonium chloride (PDMDAAC) until complete dissolution, and adjusting pH value to 8 with diethylene triamine (DETA) to obtain a polydimethyldiallylammonium chloride (PDMDAAC) modified chitosan;

[0069] Step 3: according to the ratio of m (modified chitosan):m (modified organic rare earth)=0.08:1, dripping the solution prepared in the step 2 into the solution prepared in the step 1 at the rotating speed of 500 r/min and the temperature of 70° C., stirring for 2 h, introducing into a homogenize, homogenizing and dispersing for 10 min at the rotating speed of 15000 r/min, introducing an ultrasonic dispersion for 5 min, using a diethylene triamine (DETA) to adjust pH value to 8 to obtain a modified organic rare earth load modified chitosan solution, performing a suction filtration, drying at 100° C. for 1 h, introducing into a nano-grinder for grinding for 2 h, and distributing the particle size distribution to nanoscale;

[0070] Step 4: dispersing the graphene oxide with distilled water according to a ratio (1.5 g/L), performing an ultrasonic dispersion for 2 h to uniformly disperse, adding the powder with a ration of m (modified organic rare earth loaded modified chitosan):m (graphene oxide)=12:1 into the graphene oxide dispersion liquid, under the power of 900 w, microwave radiation for 20 min, adjusting pH value to 8 by using a diethylene triamine (DETA), suction filtering, drying at 100° C. for 1 h, introducing into a nano-grinder for grin for 1 h, a modified organic rare earth load modified chitosan and a graphene oxide powder were obtained.

[0071] Step 5: preparing a nano hydrotalcite by an improved known coprecipitation method, uniformly mixing and dispersing according to a ration of m (Na.sub.2CO.sub.3):m (K.sub.2CO.sub.3):m (Mg(NO.sub.3).sub.2.6H.sub.2O):m (Al(NO.sub.3).sub.3.9H.sub.2O)=3.5:0.5:1.2:1.0, dissolving in deionized water in a ratio of (100 g/L) at a rotating speed of 1000 r/min, and stirring for 2 h to fully dissolve, slowly adding (m(modified organic rare earth loaded modified chitosan, graphene oxide powder:m(hydrotalcite))=3.5:1, then slowly dripping K.sub.2CO.sub.3 or KOH to adjust the pH to 9, and the mixed solution will appear to precipitate (pH=9.0), finally, continuously magnetically stirring for 2 h, introducing a homogenizer, and dispersing for 10 min at a rotation speed of 15000 r/min, and introducing ultrasonic dispersion for 5 min to obtain a uniformly dispersed nano mixed solution product; further, transferring the mixed solution to a jacketed reaction kettle, and the liquid product was obtained after hydrothermal reaction at 110° C. for 36 h. Further, fully washing with absolute ethanol and deionized water, filtering with suction, freeze drying, and introducing into a nano-grinder for grinding for 2 h to obtain a powder nano-composite material product.

[0072] The preparation parameter of embodiments 1 to 5 and the product property such as CO.sub.2 capture of the nano carbon dioxide capture agent are shown in table 1 and table 2 below.

TABLE-US-00001 TABLE 1 preparation parameters and product properties of embodiments 1 to 5 M hydrotalcite:m (organic M modified M (modified mineral organic chitosan soil modified M supported supported mineral chitosan:m by modified CO2 capture soil: M organic mineral chitosan performance Types of Type M chitosan:m modified soil):m and mmol/g cationic of PH cationic cationic mineral graphene graphene 0° C. 25° C. 100° C. Embodiments surfactants regulator surfactant surfactant soil oxide oxide) 1 atm 1 atm 1 atm Embodiment l DTAB MEA   3:1   9:1 0.05:1  8:1 1:2   2.7 3.1 3.9 (diatomite) Embodiment 2 CTMAB DEA   1:1   11:1 0.06:1  9:1 1:2.5 3.0 3.9 5.2 (kaolin) Embodiment 3 CTAB TEPA   2:1   10:1  0.1:1 11:1 1:3   6.2 6.6 8.9 (bentonite) Embodiment 4 CTAC TEA 1.5:1  9.5:1 0.09:1 15:1 1:4   4.3 4.6 6.5 (Attapulgite) Embodiment 5 PDMDAAC DETA 2.5:1 10.5:1 0.08:1 12:1 1:3.5 3.7 4.1 5.8 (rare earth) Note: CO.sub.2 capture performance, at CO.sub.2 flow rate of 6 ml/min

TABLE-US-00002 TABLE 2 preparation parameters and powder product properties of embodiments 1 to 5 specific mean Total Types of Type of surface pore pore cationic pH area size volume Embodiments surfactants regulator g/m.sup.2 nm g/cm3 Embodiment 1 DTAB MEA 96.4 10.90 0.33 Embodiment 2 CTMAB DEA 132.1 9.82 0.85 Embodiment 3 CTAB TEPA 231.3 6.70 2.81 Embodiment 4 CTAC TEA 173.9 8.19 1.09 Embodiment 5 PDMDAAC DETA 111.8 13.53 0.97

[0073] Experiment Design

[0074] According to the above-mentioned 5 embodiments, the experiment group and one control group (CK group) were set for each of the 3 groups according to the experiment design

[0075] Experiment 1, five CO.sub.2 capture agent application areas and one non-application area were set up in six greenhouses (CK group as control). the experimental area and the control area were planted at the same time, the cucumber in the experimental area was applied with CO.sub.2 capture agent from November 26th, and there were five CO.sub.2 capture agent application areas in the greenhouse. the greenhouses in embodiments 1 and 2 were directly added with water according to liquid products (liquid products:water=1:30), and the spraying amount per mu of leaves was equivalent to 1 kg. In the greenhouses where Embodiments 3, 4 and 5 are located, according to the volume and mass ratio of powdery products to water (2 g/L), the amount of liquid products is 1 kg per mu. According to the investigation of botanical properties, the observation indexes include the plant height, stem circumference, number and area of functional leaves, weight of single melon and yield of cucumber in applied and non-applied areas. The results are shown in Table 3.

TABLE-US-00003 Application results of CO.sub.2 capture agents prepared in embodiments 1 to 5. Stem Functional Single Yield increase Leaf Leaf circum- plant Fruit leaf melon per Yield the width length ference height number. number weight plant per mu production Embodiments (cm) (cm) (cm) (cm) (pieces) (slice) (g) (kg) (kg) % CK 14.5 14.00 0.55 113.0 0.60 15.5 6.70 1.03 4654 / Embodiment 1 16.3 16.0 0.71 126.2 0.94 17.0 7.20 1.31 5653 21.5 Embodiment 2 16.5 16.1 0.73 132.0 1.00 16.0 7.40 1.74 5815 24.9 Embodiment 3 17.5 16.5 0.80 138.0 1.20 16.0 8.60 1.74 7667 64.5 Embodiment 4 17.0 16.3 0.75 132.0 1.10 16.5 8.20 1.52 6778 45.6 Embodiment 5 16.8 16.1 0.78 129.0 1.05 16.1 7.80 1.50 6701 43.9

[0076] Experiment 2, wherein five CO.sub.2 capture agent application areas of 5 mu each were set up outdoors, one unused area (CK group as control) was 1 mu, the experimental area and the control area were planted at the same time, and the cucumbers in the experimental area were applied with CO.sub.2 capture agent from April 30, In that five application area of CO.sub.2 capture agent (5 mu), the experiments of embodiment 1 and embodiment 2 were conducted by directly apply the powder product to the water volume mass ratio (2 g/L), and spraying the amount of liquid product per mu of leaf surface is equivalent to 1 kg of liquid product, In that experiment of embodiment 3, embodiment 4, and embodiment 5, the liquid product was directly mixed with wat (liquid product:Water=1:30), the amount of the liquid product per mu was sprayed, and the botanical properties were investigated, and the observed indexes include plant height, stem girth, the number of functional leaves and leaf area, single melon weight and yield in the applied and non-applied areas, as shown in Table 4.

TABLE-US-00004 TABLE 4 Application results of CO.sub.2 capture agents prepared in embodiments 1 to 5 Stem Functional Single Yield increase Leaf Leaf circum- plant Fruit leaf melon per Yield the width length ference height number. number weight plant per mu production Embodiments (cm) (cm) (cm) (cm) (pieces) (slice) (g) (kg) (kg) % CK 14.95 15.00 0.60 124.0 0.65 16.0 7.0 1.22 4789 / Embodiment 1 17.1 15.6 0.70 156.2 0.90 17.0 7.20 1.41 5788 20.8 Embodiment 2 17.3 16.5 0.71 162.4 0.94 17.1 8.0 1.54 6017 25.6 Embodiment 3 17.8 16.9 0.78 179.5 1.15 17.5 8.80 1.80 7983 66.7 Embodiment 4 17.5 16.7 0.73 164.0 1.05 17.0 8.50 1.73 7235 51.1 Embodiment 5 17.0 16.3 0.74 158.9 1.10 17.0 8.20 1.65 6908 44.0

[0077] Experiment 3, five CO.sub.2 capture agent application areas and one non-application area were set up in six greenhouses (CK group as control). The experimental area and the control area were planted at the same time. The pepper in the experimental area was applied with CO.sub.2 capture agents from October 18th, and five CO.sub.2 capture agent application areas were set up. The greenhouses in embodiment 1, embodiment 2 and embodiment 3 were directly watered according to liquid products (liquid products:water=1:30), and spraying on leaf surface per mu is equivalent to 1 kg of liquid products, while spraying on leaf surface per mu is equivalent to 1 kg of liquid products according to the volume-mass ratio of powdery products to water (2 g/L) in the greenhouses where embodiment 4 and embodiment 5 are located. According to the investigation of botanical characters, the observation indexes include the plant height, stem circumference, number and area of functional leaves, weight of single melon and yield of cucumber in applied and non-applied areas, as shown in Table 5.

TABLE-US-00005 TABLE 5 Application results of CO.sub.2 capture agents prepared in embodiment 1 to embodiment 5. Stem Fruit Yield increase leaf thick- plant setting rate pepper Pepper per the area ness height (individual/ length weight plant Yield per production Embodiments (cm2) (cm) (cm) plant) (cm) (g) (kg) mu (kg) % CK 132.95 0.47 79.3 67 13.1 9.26 0.92 4600 / Embodiment 1 162.6 0.59 85.1 84.00 17.6 14.9 1.26 6327 37.5 Embodiment 2 170.3 0.61 88.3 84.5 19.1 15.7 1.33 6633 44.2 Embodiment 3 179.23 0.67 95.2 85.25 21.6 16.2 1.381 6905 20.8 Embodiment 4 175.0 0.63 92.4 84.9 20.0 15.50 1.34 6700 50.1 Embodiment 5 172.6 0.62 91.3 84.0 18.8 15.20 1.30 6500 41.0

[0078] The above is only a preferred embodiment of the present disclosure, and is not intended to limit the present disclosure. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.