Method for efficiently preparing ferrate based on nascent interfacial activity

Abstract

A method for efficiently preparing ferrate based on nascent state interfacial activity. The method is as follows: (a) preparing nascent iron solution; (b) adding an oxidizing agent to the iron solution of step (a); (c) adding alkali solution or alkali particles to the mixed solution of step (b), mixing by stirring, and carrying out solid-liquid separation; (d) adding a stabilizing agent to the liquid separated out in step (c), and thus obtaining ferrate solution. The yield is 78-98%. The prepared ferrate solution is stable and can be stored for 3-15 days.

Claims

1. A high efficiency preparation method for ferrate based on activity in nascent state interface, characterized in that, the high efficiency preparation method for ferrate based on activity in nascent state interface comprises the steps of: (a) adding solid iron salt to a first alkaline solution with a pH of 5˜9 for hydrolysis and producing an iron solution in nascent state with an equivalent concentration of iron of 0.0001˜1 mol/L; (b) measuring and obtaining 5˜100 mL of the iron solution in nascent state from step (a), adding an oxidizing agent based on a molar ratio of the iron in nascent state and the oxidizing agent at 1:0.1˜20 and mixing the oxidizing agent with the iron solution in nascent state to obtain a mixture; (c) under 5° C.-60° C., adding 5-100 mL second alkaline solution or 0.2˜70 g alkaline granules to the mixture from the step (b), wherein the second alkaline solution has a concentration of 0.1˜16 mol/L; then stirring and mixing for 0.1˜30 min to form an intermediate solution; after the intermediate solution turns purplish black color completely, processing solid-liquid separation by centrifugation or filtration to obtain a liquid; and (d) adding stabilizing agent based on a molar ratio of the equivalent concentration of iron in the liquid from the step (c) and the stabilizing agent to obtain a ferrate solution, where a molar ratio of an equivalent concentration or iron in the liquid from the step (c) to the stabilizing agent is 1:0.1-10.

2. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 1, characterized in that, in the step (a), the iron salt is one or more of the group consisting of: ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate, ferrous chloride and ferric chloride.

3. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 1, characterized in that, in the step (a), the first alkaline solution is one or more of the group consisting of: sodium phosphate, disodium hydrogen phosphate solution, sodium aluminate, sodium borate, sodium acetate, sodium bicarbonate solution, sodium carbonate solution, sodium silicate solution, potassium carbonate solution and potassium bicarbonate solution.

4. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 1, characterized in that, in the step (b), the oxidizing agent is one or more of the group consisting of: perchloric acid, peracetic acid, sodium persulfate, potassium persulfate, potassium monopersulfate, sodium hypochlorite, potassium hypochlorite and ozone.

5. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 1, characterized in that, in the step (c), the alkaline granules is one or more of the group consisting of: potassium hydroxide and sodium hydroxide; the second alkaline solution is one or more of the group consisting of: potassium hydroxide solution and sodium hydroxide solution.

6. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 1, characterized in that, in the step (d), the stabilizing agent is one or more of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, sodium hypochlorite, potassium hypochlorite and sodium phosphate.

7. A high efficiency preparation method for ferrate based on activity in nascent state interface, characterized in that, the high efficiency preparation method for ferrate based on activity in nascent state interface comprises the steps of: (a) adding solid iron salt to a first alkaline solution with a pH of 5˜9 for hydrolysis and producing an iron solution in nascent state with an equivalent concentration of iron of 0.0001˜1 mol/L; (b) measuring and obtaining 5˜100 mL of the iron solution in nascent state from the step (a), adding 5˜100 mL second alkaline solution or 0.2˜70 g alkaline granules to the iron solution in nascent state, wherein with the second alkaline solution has a concentration of 0.1˜16 mol/L; stirring to mix and obtaining a mixture; (c) under 5° C.-60° C., adding an oxidizing agent based on a molar ratio of the iron in nascent state and the oxidizing agent at 1:0.1˜20 to the mixture obtained from the step (b), stirring and mixing for 0.1˜30 min to form an intermediate solution; after the intermediate solution turns purplish black color completely, processing solid-liquid separation by centrifugation or filtration to obtain a liquid; and (d) adding stabilizing agent based on a molar ratio of the equivalent concentration of iron in the liquid obtained from the step (c) and the stabilizing agent to obtain a ferrate solution, wherein a molar ratio of an equivalent concentration of iron in the liquid from the step (c) to the stabilizing agent is 1:0.1-10.

8. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 7, characterized in that, in the step (a), the iron salt is one or more of the group consisting of: ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate, ferrous chloride and ferric chloride; in the step (a), the first alkaline solution is one or more of the group consisting of: sodium phosphate, disodium hydrogen phosphate solution, sodium aluminate, sodium borate, sodium acetate, sodium bicarbonate solution, sodium carbonate solution, sodium silicate solution, potassium carbonate solution and potassium bicarbonate solution; in the step (b), the alkaline granules is one or more of the group consisting of: potassium hydroxide and sodium hydroxide; in the step (b), the second alkaline solution is one or more of the group consisting of: potassium hydroxide solution and sodium hydroxide solution; in the step (c), the oxidizing agent is one or more of the group consisting of: perchloric acid, peracetic acid, sodium persulfate, potassium persulfate, potassium monopersulfate, sodium hypochlorite, potassium hypochlorite and ozone; in the step (d), the stabilizing agent is one or more of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, sodium hypochlorite, potassium hypochlorite and sodium phosphate.

9. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 2, characterized in that, in the step (c), the alkaline granules is one or more of the group consisting of: potassium hydroxide and sodium hydroxide; the second alkaline solution is one or more of the group consisting of: potassium hydroxide solution and sodium hydroxide solution.

10. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 2, characterized in that, in the step (d), the stabilizing agent is one or more of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, sodium hypochlorite, potassium hypochlorite and sodium phosphate.

11. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 3, characterized in that, in the step (c), the alkaline granules is one or more of the group consisting of: potassium hydroxide and sodium hydroxide; the second alkaline solution is one or more of the group consisting of: potassium hydroxide solution and sodium hydroxide solution.

12. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 3, characterized in that, in the step (d), the stabilizing agent is one or more of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, sodium hypochlorite, potassium hypochlorite and sodium phosphate.

13. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 4, characterized in that, in the step (c), the alkaline granules is one or more of the group consisting of: potassium hydroxide and sodium hydroxide; the second alkaline solution is one or more of the group consisting of: potassium hydroxide solution and sodium hydroxide solution.

14. The high efficiency preparation method for ferrate based on activity in nascent state interface according to claim 4, characterized in that, in the step (d), the stabilizing agent is one or more of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, sodium hypochlorite, potassium hypochlorite and sodium phosphate.

Description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(1) The embodiment of the present invention as shown and described below is exemplary only and not intended to be limiting. This invention includes all combinations of different embodiments of the present invention.

(2) Preferred embodiment 1: According to a high efficiency preparation method for ferrate based on activity in nascent state interface of the preferred embodiment of the present invention, the method comprises the steps of:

(3) (a) adding iron salt to a first alkaline solution having a pH of 5˜9 for hydrolysis and producing an iron solution in nascent state with an equivalent concentration of iron of 0.0001˜1 mol/L;

(4) (b) measuring and obtaining 5˜100 mL of the iron solution in nascent state obtained from step (a), adding oxidizing agent based on a molar ratio of the iron in nascent state and the oxidizing agent at 1:0.1˜20, and allowing to mix to obtain a mixture;

(5) (c) under the condition of 5° C.˜60° C., adding 5˜100 mL second alkaline solution with a concentration of 0.1˜16 mol/L or adding 0.2˜70 g alkaline granules to the mixture obtained from the step (b); stirring and mixing for 0.1˜30 min; allowing the solution to turn purplish black color completely and then process solid-liquid separation by centrifugation or filtration to obtain a liquid; and

(6) (d) adding stabilizing agent based on a molar ratio of the equivalent concentration of iron in the liquid obtained from the step (c) and the stabilizing agent of 1:0.1˜10 to obtain a ferrate solution, wherein a yield is 80˜98%.

(7) Preferred embodiment 2: The difference between this preferred embodiment and the above preferred embodiment 1 is that: in the step (a), the iron salt is one or a combination of the group consisting of: ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate, ferrous chloride and ferric chloride. All others are the same as that of the above preferred embodiment 1.

(8) According to this embodiment, if the iron salt is a combination of different compounds, the ratio of different compounds can be any ratio.

(9) Preferred embodiment 3: The difference between this preferred embodiment and the above preferred embodiment 1 or 2 is that: in the step (a), the first alkaline solution is one or a combination of the group consisting of: sodium phosphate, disodium hydrogen phosphate solution, sodium aluminate, sodium borate, sodium acetate, sodium bicarbonate solution, sodium carbonate solution, sodium silicate solution, potassium carbonate solution and potassium bicarbonate solution. All others are the same as that of the above preferred embodiment 1 or 2.

(10) According to this embodiment, if the first alkaline solution is a combination of different compounds, the ratio of different compounds can be any ratio.

(11) Preferred embodiment 4: The difference between this preferred embodiment and one of the above preferred embodiments 1-3 is that: in the step (b), the oxidizing agent is one or a combination of the group consisting of: perchloric acid, peracetic acid, sodium persulfate, potassium persulfate, potassium monopersulfate, sodium hypochlorite, potassium hypochlorite and ozone. All others are the same as that one of the above preferred embodiments 1-3.

(12) According to this embodiment, if the oxidizing agent is a combination of different compounds, the ratio of different compounds can be any ratio.

(13) Preferred embodiment 5: The difference between this preferred embodiment and one of the above preferred embodiments 1-4 is that: in the step (c), the alkaline granules is one or a combination of the group consisting of: potassium hydroxide and sodium hydroxide; in the step (c), the second alkaline solution is one or a combination of the group consisting of: potassium hydroxide solution and sodium hydroxide solution All others are the same as that one of the above preferred embodiments 1-4.

(14) According to this embodiment, if the second alkaline solution is a combination of different compounds, the ratio of different compounds can be any ratio.

(15) Preferred embodiment 6: The difference between this preferred embodiment and one of the above preferred embodiments 1-5 is that: in the step (d), the stabilizing agent is one or a combination of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogencarbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, hydrogen peroxide, sodium hypochlorite, potassium hypochlorite and sodium phosphate. All others are the same as that one of the above preferred embodiments 1-5.

(16) According to this embodiment, if the stabilizing agent is a combination of different compounds, the ratio of different compounds can be any ratio.

(17) Preferred embodiment 7: According to a high efficiency preparation method for ferrate based on activity in nascent state interface of the preferred embodiment of the present invention, the method comprises the steps of:

(18) (a) adding iron salt to a first alkaline solution having a pH of 5˜9 for hydrolysis and producing an iron solution in nascent state with an equivalent concentration of iron of 0.0001˜1 mol/L;

(19) (b) measuring and obtaining 5˜100 mL of the iron solution in nascent state from step (a), adding 5˜100 mL second alkaline solution with a concentration of 0.1˜16 mol/L or adding 0.2˜70 g alkaline granules to the iron solution in nascent state; stirring to mix and obtaining a mixture;

(20) (c) under the condition of 5° C.˜60° C., adding oxidizing agent based on a molar ratio of the iron in nascent state and the oxidizing agent at 1:0.1˜20 to the mixture obtained from the step (b), stirring and mixing for 0.1˜30 min; allowing the solution to turn purplish black color completely and then process solid-liquid separation by centrifugation or filtration to obtain a liquid; and

(21) (d) adding stabilizing agent based on a molar ratio of the equivalent concentration of iron in the liquid obtained from the step (c) and the stabilizing agent of 1:0.1˜10 to obtain a ferrate solution, wherein a yield is 78˜98%.

(22) Preferred embodiment 8: The difference between this preferred embodiment and the above preferred embodiment 7 is that:

(23) in the step (a), the iron salt is one or a combination of the group consisting of: ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate, ferrous chloride and ferric chloride;

(24) in the step (a), the first alkaline solution is one or a combination of the group consisting of: sodium phosphate, disodium hydrogen phosphate solution, sodium aluminate, sodium borate, sodium acetate, sodium bicarbonate solution, sodium carbonate solution, sodium silicate solution, potassium carbonate solution and potassium bicarbonate solution;

(25) in the step (b), the alkaline granules is one or a combination of the group consisting of: potassium hydroxide and sodium hydroxide; in the step (b), the second alkaline solution is one or a combination of the group consisting of: potassium hydroxide solution and sodium hydroxide solution;

(26) in the step (c), the oxidizing agent is one or a combination of the group consisting of: perchloric acid, peracetic acid, sodium persulfate, potassium persulfate, potassium monopersulfate, sodium hypochlorite, potassium hypochlorite and ozone;

(27) in the step (d), the stabilizing agent is one or a combination of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, hydrogen peroxide, sodium hypochlorite, potassium hypochlorite and sodium phosphate. All others are the same as that of the above preferred embodiment 7.

(28) According to this embodiment, if the iron salt is a combination of different compounds, the ratio of different compounds can be any ratio.

(29) According to this embodiment, if the first alkaline solution is a combination of different compounds, the ratio of different compounds can be any ratio.

(30) According to this embodiment, if the oxidizing agent is a combination of different compounds, the ratio of different compounds can be any ratio.

(31) According to this embodiment, if the second alkaline solution is a combination of different compounds, the ratio of different compounds can be any ratio.

(32) According to this embodiment, if the stabilizing agent is a combination of different compounds, the ratio of different compounds can be any ratio.

(33) Preferred embodiment 9: According to a high efficiency preparation method for ferrate based on activity in nascent state interface of the preferred embodiment of the present invention, the method comprises the steps of:

(34) (a) adding iron salt to a first alkaline solution having a pH of 5˜9 for hydrolysis and producing an iron solution in nascent state with an equivalent concentration of iron of 0.0001˜1 mol/L;

(35) (b) measuring and obtaining 5˜100 mL of the iron solution in nascent state from step (a), adding oxidizing agent based on a molar ratio of the iron in nascent state and the oxidizing agent at 1:0.1˜20, and allowing to mix to obtain a mixture;

(36) (c) mixing 5˜100 mL second alkaline solution with a concentration of 0.1˜16 mol/L or adding 0.2˜70 g alkaline granules with a stabilizing agent; and

(37) (d) under the condition of 5° C.˜60° C., adding the product obtained from step (c), to the mixture obtained from the step (b); stirring and mixing for 0.1˜30 min; allowing the solution to turn purplish black color completely and then process solid-liquid separation by centrifugation or filtration to obtain a ferrate solution, wherein a yield is 84˜98%;

(38) wherein a molar ratio of the stabilizing agent in the step (c) and the iron in nascent state in the step (b) is 1:0.1˜10.

(39) Preferred embodiment 10: The difference between this preferred embodiment and the above preferred embodiment 9 is that:

(40) in the step (a), the iron salt is one or a combination of the group consisting of: ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate, ferrous chloride and ferric chloride;

(41) in the step (a), the first alkaline solution is one or a combination of the group consisting of: sodium phosphate, disodium hydrogen phosphate solution, sodium aluminate, sodium borate, sodium acetate, sodium bicarbonate solution, sodium carbonate solution, sodium silicate solution, potassium carbonate solution and potassium bicarbonate solution;

(42) in the step (b), the oxidizing agent is one or a combination of the group consisting of: perchloric acid, peracetic acid, sodium persulfate, potassium persulfate, potassium monopersulfate, sodium hypochlorite, potassium hypochlorite and ozone;

(43) in the step (c), the alkaline granules is one or a combination of the group to consisting of: potassium hydroxide and sodium hydroxide; in the step (b), the second alkaline solution is one or a combination of the group consisting of: potassium hydroxide solution and sodium hydroxide solution;

(44) in the step (c), the stabilizing agent is one or a combination of the group consisting of: sodium perchlorate, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium bicarbonate, sodium pyrophosphate, peracetic acid, hydrogen peroxide, sodium hypochlorite, potassium hypochlorite and sodium phosphate.

(45) All others are the same as that of the above preferred embodiment 9.

(46) According to this embodiment, if the iron salt is a combination of different compounds, the ratio of different compounds can be any ratio.

(47) According to this embodiment, if the first alkaline solution is a combination of different compounds, the ratio of different compounds can be any ratio.

(48) According to this embodiment, if the oxidizing agent is a combination of different compounds, the ratio of different compounds can be any ratio.

(49) According to this embodiment, if the second alkaline solution is a combination of different compounds, the ratio of different compounds can be any ratio.

(50) According to this embodiment, if the stabilizing agent is a combination of different compounds, the ratio of different compounds can be any ratio.

(51) The following experiments are used to test and verify the advantageous effect of the present invention:

(52) Experiment 1:

(53) A high efficiency preparation method for ferrate based on activity in nascent state interface comprises the following steps of:

(54) (a) adding ferric nitrate to sodium borate solution having a pH of 5˜6 for hydrolysis under room temperature for 5˜30 min and producing an iron solution in nascent state with an equivalent concentration of iron of 0.0001˜0.0005 mol/L;

(55) (b) measuring and obtaining 5 mL of the iron solution in nascent state obtained from the step (a), adding peracetic acid based on a molar ratio of the iron in nascent state and the peracetic acid of 1:0.1˜0.2, and allowing to mix to obtain a mixture;

(56) (c) under the condition of 5° C., adding 5 mL sodium hydroxide solution with a concentration of 0.1˜0.2 mol/L to the mixture obtained from the step (b); stirring and mixing for 25˜30 min; allowing the solution to turn purplish black color completely and then process solid-liquid separation by centrifugation or filtration to obtain a liquid; and

(57) (d) adding sodium perchlorate based on a molar ratio of the equivalent concentration of iron in the liquid obtained from the step (c) and the sodium perchlorate of 1:1˜2 to obtain a ferrate solution, where a yield is 87˜90%.

(58) The resulting ferrate solution obtained from this experiment can be stored for 5˜15 days.

(59) Experiment 2:

(60) A high efficiency preparation method for ferrate based on activity in nascent state interface comprises the following steps of:

(61) (a) adding an iron salt ferric sulfate to an alkaline solution having a pH of 8˜9 for hydrolysis under room temperature for 5˜30 min and producing an iron solution in nascent state having an equivalent concentration of iron of 0.001˜0.005 mol/L;

(62) (b) measuring and obtaining 5 mL of the iron solution in nascent state obtained from the step (a), adding potassium hypochlorite based on a molar ratio of the iron in nascent state and the potassium hypochlorite of 1:1˜2, and allowing to mix to obtain a mixture;

(63) (c) under the condition of 15° C., adding 5 mL potassium hydroxide with a concentration of 1˜2 mol/L to the mixture obtained from the step (b); stirring and mixing for 2.5˜5 min; allowing the solution to turn purplish black color completely and then process solid-liquid separation by centrifugation or filtration to obtain a liquid; and

(64) (d) adding sodium perchlorate based on a molar ratio of the equivalent concentration of iron in the liquid obtained from the step (c) and the sodium perchlorate of 1:3˜5 to obtain a ferrate solution, where a yield is 95˜98%.

(65) The iron salt is a mixture of ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate and ferrous chloride at any ratio.

(66) The alkaline solution is mixture of sodium phosphate, disodium hydrogen phosphate solution, sodium aluminate, sodium borate, sodium acetate, sodium bicarbonate solution, sodium carbonate solution, sodium silicate solution, potassium carbonate solution and potassium bicarbonate solution at any ratio.

(67) The resulting ferrate solution obtained from this experiment can be stored for 5˜14 days.

(68) Experiment 3:

(69) A high efficiency preparation method for ferrate based on activity in nascent state interface comprises the following steps of:

(70) (a) adding an iron to sodium carbonate solution having a pH of 7˜8 for hydrolysis under room temperature for 5˜30 min and producing an iron solution in nascent state with an equivalent concentration of iron of 0.0001˜0.0005 mol/L;

(71) (b) measuring and obtaining 10 mL of the iron solution in nascent state obtained from the step (a), adding potassium monopersulfate based on a molar ratio of the iron in nascent state and the potassium monopersulfate of 1:2˜3, and allowing to mix to obtain a mixture;

(72) (c) under the condition of 20° C., adding 15 mL potassium hydroxide with a concentration of 6˜8 mol/L to the mixture obtained from the step (b); stirring and mixing for 1.5˜3 min; allowing the solution to turn purplish black color completely and then process solid-liquid separation by centrifugation or filtration to obtain a liquid; and

(73) (d) adding sodium silicate based on a molar ratio of the equivalent concentration of iron in the liquid obtained from the step (c) and the sodium silicate of 1:0.1˜5 to obtain a ferrate solution, where a yield is 94˜98%.

(74) The iron salt is a mixture of ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate and ferrous chloride at any ratio.

(75) The resulting ferrate solution obtained from this experiment can be stored for 6˜15 days.

(76) Experiment 4:

(77) A high efficiency preparation method for ferrate based on activity in nascent state interface comprises the following steps of:

(78) (a) adding an iron to potassium bicarbonate solution having a pH of 7˜9 for hydrolysis under room temperature for 5˜30 min and producing an iron solution in nascent state with an equivalent concentration of iron of 0.01˜0.02 mol/L;

(79) (b) measuring and obtaining 20 mL of the iron solution in nascent state obtained from the step (a), adding an oxidizing agent based on a molar ratio of the iron in nascent state and the oxidizing agent of 1:0.1˜0.2, and allowing to mix to obtain a mixture;

(80) (c) under the condition of 35° C., adding 20 mL potassium hydroxide with a concentration of 6˜8 mol/L to the mixture obtained from the step (b); stirring and mixing for 15˜20 min; allowing the solution to turn purplish black color completely and then process solid-liquid separation by centrifugation or filtration to obtain a liquid; and

(81) (d) adding sodium perchlorate based on a molar ratio of the equivalent concentration of iron in the liquid obtained from the step (c) and the sodium perchlorate of 1:4˜5 to obtain a ferrate solution, where a yield is 89˜93%.

(82) The iron salt is a mixture of ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate and ferrous chloride at any ratio.

(83) The oxidizing agent is a mixture of perchloric acid, peracetic acid, sodium persulfate, potassium persulfate, potassium monopersulfate, sodium hypochlorite, potassium hypochlorite and ozone at any ratio.

(84) The resulting ferrate solution obtained from this experiment can be stored for 7˜15 days.

(85) Experiment 5:

(86) A high efficiency preparation method for ferrate based on activity in nascent state interface comprises the following steps of:

(87) (a) adding an iron to sodium acetate solution having a pH of 5˜7 for hydrolysis under room temperature for 5˜30 min and producing an iron solution in nascent state with an equivalent concentration of iron of 0.007˜0.01 mol/L;

(88) (b) measuring and obtaining 10 mL of the iron solution in nascent state obtained from the step (a), adding an oxidizing agent based on a molar ratio of the iron in nascent state and the oxidizing agent of 1:0.1˜0.2, and allowing to mix to obtain a mixture;

(89) (c) under the condition of 25° C., adding 4.5˜5 g granules of potassium hydroxide or sodium hydroxide to the mixture obtained from the step (b); stirring and mixing for 2˜5 min; allowing the solution to turn purplish black color completely and then process solid-liquid separation by centrifugation or filtration to obtain a liquid; and

(90) (d) adding sodium perchlorate based on a molar ratio of the equivalent concentration of iron in the liquid obtained from the step (c) and the sodium perchlorate of 1:0.1˜0.5 to obtain a ferrate solution, where a yield is 82˜85%.

(91) The iron salt is a mixture of ferric nitrate, ferrous nitrate, ferric sulfate, ferrous sulfate and ferrous chloride at any ratio.

(92) The oxidizing agent is a mixture of perchloric acid, peracetic acid, sodium persulfate, potassium persulfate, potassium monopersulfate, sodium hypochlorite, potassium hypochlorite and ozone at any ratio.

(93) The resulting ferrate solution obtained from this experiment can be stored for 8˜15 days.