METHOD FOR PREPARING CARBON-FUNCTIONALIZED PR6O11

Abstract

A method for preparing carbon-functionalized praseodymium oxide includes the following steps: dissolving Pr(NO.sub.3).sub.3.6H.sub.2O in an acid dye solution and stirring to form a mixed solution; adding NH.sub.3H.sub.2O dropwise in the mixed solution while stirring to adjust a pH value of the mixed solution, thereby forming a suspension, and then aging the suspension for 2 to 4 hours; filtering, washing with water, washing with alcohol, and drying the aged suspension to obtain a carbon-functionalized Pr.sub.6O.sub.11 precursor; and placing the carbon-functional zed Pr.sub.6O.sub.11 precursor in a tube furnace under a protection of nitrogen, heating the carbon-functionalized Pr.sub.6O.sub.11 precursor to a sintering temperature at a heating rate of 4 to 6 degrees Celsius/min, keeping at the sintering temperature for 3 to 4 hours, and then cooling to room temperature, thereby obtaining the carbon-functionalized. Pr.sub.6O.sub.11.

Claims

1. A method for preparing carbon-functionalized Pr.sub.6O.sub.11 comprising: dissolving Pr(NO.sub.3).sub.3.6H.sub.2O in an acid dye solution and stirring to form a mixed solution; adding NH.sub.3.H.sub.2O dropwise in the mixed solution while stirring to adjust a pH value of the mixed solution, thereby forming a suspension, and then aging the suspension for 2 to 4 hours; filtering, washing with water, washing with alcohol, and drying the aged suspension to obtain a carbon-functionalized Pr.sub.6O.sub.11 precursor; and placing the carbon-functionalized Pr.sub.6O.sub.11 precursor in a tube furnace and under a protection of nitrogen, heating the carbon-functionalized Pr.sub.6O.sub.11 precursor to a sintering temperature at a heating rate of 4 to 6 degrees Celsius/min, keeping at the sintering temperature for 3 to 4 hours, and then cooling to room temperature, thereby obtaining the carbon-functionalized Pr.sub.6O.sub.11.

2. The method for preparing carbon-functionalized Pr.sub.6O.sub.11 of claim 1, wherein the acid dye solution comprises at least one acid dye selected from a grouts consisting of Acid Red 14, Acid Red 17, and any combination thereof.

3. The method for preparing carbon-functionalized Pr.sub.6O.sub.11 of claim 2, wherein a concentration of the acid dye solution is in a range of 0.05 mmol/L to 0.10 mmol/L.

4. The method for preparing carbon-functionalized Pr.sub.6O.sub.11 of claim 1, wherein in the mixed solution, Pr(NO.sub.3).sub.3.6H.sub.2O is completely dissolved in the acid dye solution.

5. The method for preparing carbon-functionalized Pr.sub.6O.sub.11 of claim 1, wherein the pH value of the suspension is adjusted to 8.0 to 9.5 by NH.sub.3.H.sub.2O to precipitate Pr(OH).sub.3 and acid dyes from the mixed solution simultaneously to obtain the suspension.

6. The method for preparing carbon-functionalized Pr.sub.6O.sub.11 of claim 1, wherein the carbon-functionalized Pr.sub.6O.sub.11 precursor comprises Pr(OH).sub.3 and acid dyes, Pr(OH).sub.3 and the acid dyes are uniformly dispersed, and after heating, in the carbon-functionalized Pr.sub.6O.sub.11, Pr.sub.6O.sub.11 and C are uniformly dispersed.

7. The method for preparing carbon-functionalized Pr.sub.6O.sub.11 of claim 1, wherein the sintering temperature is in a range of 550 to 650 degrees Celsius.

8. The method for preparing carbon-functionalized Pr.sub.6O.sub.11 of claim 1, Wherein a mass percentage of NH.sub.3.H.sub.2O is 25%.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Implementations of the present disclosure will now be described, by way of embodiments, with reference to the attached figures.

[0029] FIG. 1 is an X-Ray diffraction spectrum of Pr.sub.6O.sub.11 and carbon-functionalized Pr.sub.6O.sub.11.

[0030] FIG. 2 is an ultraviolet-visible light absorption spectrum of Pr.sub.6O.sub.11 and carbon-functionalized Pr.sub.6O.sub.11.

[0031] FIG. 3a is an XPS spectrum of Pr.sub.6O.sub.11 and carbon-functionalized Pr.sub.6O.sub.11 showing C 1s peaks.

[0032] FIG. 3b is a fluorescence spectrum of Pr.sub.6O.sub.11 and carbon-functionalized Pr.sub.6O.sub.11.

[0033] FIG. 4 is a catalytic degradation efficiency image of Pr.sub.6O.sub.11 and carbon-functionalized Pr.sub.6O.sub.11 for Acid Red 14 under visible light irradiation, wherein the Acid Red 14 solution has a concentration of 0.2 mM, a volume of 20 mL, a catalyst mass of 20 mg, and a pH value of 6.

DETAILED DESCRIPTION

[0034] It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale, and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure.

[0035] The term “comprising” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like.

Embodiment 1

[0036] 0.8 g of Pr(NO.sub.3).sub.3.6H.sub.2O was dissolved in 80 mL of an acid dye solution with a concentration of 0.05 mmol/L, and stirred to form an uniform mixed solution. NH.sub.3.H.sub.2O with a mass percentage of 25% was dropwise added in the mixed solution while stirring to adjust the pH value of the mixed solution to 8.0, thereby forming a suspension, and then the suspension was aged for 2 hours. A carbon-functionalized Pr.sub.6O.sub.11 precursor was obtained by filtering, washing with water, washing with alcohol, and drying the aged suspension. The carbon-functionalized Pr.sub.6O.sub.11 precursor was placed in a tube furnace, under a protection of nitrogen, heated to 550 degrees Celsius at a heating rate of 4 degrees Celsius/min, kept 550 degrees Celsius for 3 hours, and then naturally cooled to room temperature, thereby obtaining the carbon-functionalized Pr.sub.6O.sub.11.

Embodiment 2

[0037] 0.8 g of Pr(NO.sub.3).sub.3.6H.sub.2O was dissolved in 100 mL of an acid dye solution with a concentration of 0.75 mmol/L and stirred to form an uniform mixed solution. NH.sub.3.H.sub.2O with a mass percentage of 25% was dropwise added in the mixed solution while stirring to adjust the pH value of the mixed solution to 8.5, thereby forming a suspension, and then the suspension was aged for 3 hours. A carbon-functionalized Pr.sub.6O.sub.11 precursor was obtained by filtering, washing with water, washing with alcohol, and drying the aged suspension. The carbon-functionalized Pr.sub.6O.sub.11 precursor was placed in a tube furnace, under a protection of nitrogen, heated to 600 degrees Celsius at a heating rate of 5 degrees Celsius/min, kept 600 degrees Celsius for 3.5 hours, and then naturally cooled to room temperature, thereby obtaining the carbon-functionalized Pr.sub.6O.sub.11.

Embodiment 3

[0038] 0.8 g of Pr(NO.sub.3).sub.3.6H.sub.2O was dissolved in 120 mL of an acid dye solution with a concentration of 0.10 mmol/L and stirred to form an uniform mixed solution. NH.sub.3.H.sub.2O with a mass percentage of 25% was dropwise added in the mixed solution while stirring to adjust the pH value of the mixed solution to 9.5, thereby forming a suspension, and then the suspension was aged for 4 hours. A carbon-functionalized Pr.sub.6O.sub.11 precursor was obtained by filtering, washing with water, washing with alcohol, and drying the aged suspension. The carbon-functionalized Pr.sub.6O.sub.11 precursor was placed in a tube furnace, under a protection of nitrogen, heated to 650 degrees Celsius at a heating rate of 6 degrees Celsius/min, kept 650 degrees Celsius for 4 hours, and then naturally cooled to room temperature, thereby obtaining the carbon-functionalized Pr.sub.6O.sub.11.

Embodiment 4

[0039] 1.0 g of Pr(NO.sub.3).sub.3.6H.sub.2O was dissolved in 80 mL of an acid dye solution with a concentration of 0.05 mmol/L and stirred to form an uniform mixed solution. NH.sub.3.H.sub.2O with a mass percentage of 25% was dropwise added in the mixed solution while stirring to adjust the pH value of the mixed solution to 8.0, thereby forming a suspension, and then the suspension was aged for 2 hours. A carbon-functionalized Pr.sub.6O.sub.11 precursor was obtained by filtering, washing with water, washing with alcohol, and drying the aged suspension. The carbon-functionalized Pr.sub.6O.sub.11 precursor was placed in a tube furnace, under a protection of nitrogen, heated to 550 degrees Celsius at a heating rate of 4 degrees Celsius/min, kept 550 degrees Celsius for 3 hours, and then naturally cooled to room temperature, thereby obtaining the carbon-functionalized Pr.sub.6O.sub.11.

Embodiment 5

[0040] 1.0 g of Pr(NO.sub.3).sub.3.6H.sub.2O was dissolved in 100 mL of an acid dye solution with a concentration of 0.75 mmol/L and stirred to form an uniform mixed solution. NH.sub.3.H.sub.2O with a mass percentage of 25% was dropwise added in the mixed solution while stirring to adjust the pH value of the mixed solution to 8.5, thereby forming a suspension, and then the suspension was aged for 3 hours. A carbon-functionalized Pr.sub.6O.sub.11 precursor was obtained by filtering, washing with water, washing with alcohol, and drying the aged mixed solution. The carbon-functionalized Pr.sub.6O.sub.11 precursor was placed in a tube furnace, under a protection of nitrogen, heated to 600 degrees Celsius at a heating rate of 5 degrees Celsius/min, kept 600 degrees Celsius for 3.5 hours, and then naturally cooled to room temperature, thereby obtaining the carbon-functionalized Pr.sub.6O.sub.11.

Embodiment 6

[0041] 1.0 g of Pr(NO.sub.3).sub.3.6H.sub.2O was dissolved in 120 mL of an acid dye solution with a concentration of 0.10 mmol/L and stirred to form an uniform mixed solution. NH.sub.3H.sub.2O with a mass percentage of 25% was dropwise added in the mixed solution while stirring to adjust the pH value of the mixed solution to 9.5, thereby forming a suspension, and then the suspension was aged for 4 hours. A carbon-functionalized Pr.sub.6O.sub.11 precursor was obtained by filtering, washing with water, washing with alcohol, and drying the aged mixed solution. The carbon-functionalized Pr.sub.6O.sub.11 precursor was placed in a tube furnace, under a protection of nitrogen, heated to 650 degrees Celsius at a heating rate of 6 degrees Celsius/min, kept 650 degrees Celsius for 4 hours, and then naturally cooled to room temperature, thereby obtaining the carbon-functionalized Pr.sub.6O.sub.11.

Embodiment 7

[0042] 1.2 g of Pr(NO.sub.3).sub.3.6H.sub.2O was dissolved in 80 mL of an acid dye solution with a concentration of 0.05 mmol/L and stirred to form an uniform mixed solution. NH.sub.3.H.sub.2O with a mass percentage of 25% was dropwise added in the mixed solution while stirring to adjust the pH value of the mixed solution to 8.0, thereby forming a suspension, and then the suspension was aged for 2 hours. A carbon-functionalized Pr.sub.6O.sub.11 precursor was obtained by filtering, washing with water, washing with alcohol, and drying the aged mixed solution. The carbon-functionalized Pr.sub.6O.sub.11 precursor was placed in a tube furnace, under a protection of nitrogen, heated to 550 degrees Celsius at a heating rate of 4 degrees Celsius/min, kept 550 degrees Celsius for 3 hours, and then naturally cooled to room temperature, thereby obtaining the carbon-functionalized Pr.sub.6O.sub.11.

Embodiment 8

[0043] 1.2 g of Pr(NO.sub.3).sub.3.6H.sub.2O was dissolved in 100 mL of an acid dye solution with a concentration of 0.75 mmol/L and stirred to form an uniform mixed solution. NH.sub.3.H.sub.2O with a mass percentage of 25% was dropwise added in the mixed solution while stirring to adjust the pH value of the mixed solution to 8.5, thereby forming a suspension, and then the suspension was aged for 3 hours. A carbon-functionalized Pr.sub.6O.sub.11 precursor was obtained by filtering, washing with water, washing with alcohol, and drying the aged suspension. The carbon-functionalized Pr.sub.6O.sub.11 precursor was placed in a tube furnace, under a protection of nitrogen, heated to 600 degrees Celsius at a heating rate of 5 degrees Celsius/min, kept 600 degrees Celsius for 3.5 hours, and then naturally cooled to room temperature, thereby obtaining the carbon-functionalized Pr.sub.6O.sub.11.

Embodiment 9

[0044] 1.2 g of Pr(NO.sub.3).sub.3.6H.sub.2O was dissolved in 120 mL, of an acid dye solution with a concentration of 0.10 mmol/L, and stirred to form an uniform mixed solution. NH.sub.3.H.sub.2O with a mass percentage of 25% was dropwise added in the mixed solution while stirring to adjust the pH value of the mixed solution to 9.5, thereby forming a suspension, and then the suspension was aged for 4 hours. A carbon-functionalized Pr.sub.6O.sub.11 precursor was obtained by filtering, washing with water, washing with alcohol, and drying the aged mixed solution. The carbon-functionalized Pr.sub.6O.sub.11 precursor was placed in a tube furnace, under a protection of nitrogen, heated to 650 degrees Celsius at a heating rate of 6 degrees Celsius/min, kept 650 degrees Celsius for 4 hours, and then naturally cooled to room temperature, thereby obtaining the carbon-functionalized Pr.sub.6O.sub.11.

[0045] It is to be understood, even though information and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the present embodiments, the disclosure is illustrative only; changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extent indicated by the plain meaning of the terms in which the appended claims are expressed.