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pn type CaFe2O4@alpha-Fe2O3 heterojunction compound photocatalyst and preparation method and application thereof

A heterojunction and composite light technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve low production costs, cost saving, and good recyclability Effect

Inactive Publication Date: 2017-06-13
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is little information about pn-type CaFe in the open literature 2 o 4 @a-Fe 2 o 3 Preparation method of heterojunction composite photocatalyst and report on its photocatalytic application

Method used

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  • pn type CaFe2O4@alpha-Fe2O3 heterojunction compound photocatalyst and preparation method and application thereof
  • pn type CaFe2O4@alpha-Fe2O3 heterojunction compound photocatalyst and preparation method and application thereof
  • pn type CaFe2O4@alpha-Fe2O3 heterojunction compound photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Take 0.4mol / L FeCl 3 and 0.1mol / L CaCl 2 Mix 10 mL each of the solutions and add 0.69 g of Na 2 C 2 o 4 , mixed and stirred for 30min to obtain a clear mixed solution.

[0031] (2) Under stirring, use 1mol / L NaOH solution to adjust the pH value of the mixed solution prepared in step (1) to 5, dilute the solution to 50mL with deionized water, and transfer it into PTFE stainless steel high-pressure water In a thermal reaction kettle, conduct a hydrothermal reaction at 160°C for 8 hours, and cool naturally to room temperature to obtain a solid-liquid system containing primary precipitates.

[0032] (3) Use 1mol / L NaOH solution to adjust the pH of the solid-liquid system obtained in step (2) to 8.5, stir for 30 minutes and then let it stand for 8 hours, then wash with deionized water and ethanol three times each, and remove the precipitate Dry at 80°C for 12 hours and grind to obtain a precursor.

[0033] (4) Heat-treat the precursor prepared in step (3) in an air...

Embodiment 2

[0037] (1) Take 0.6mol / L FeCl 3 and 0.1mol / L CaCl 2 10 mL of the solution was mixed and 0.97 g of Na 2 C 2 o 4 , mixed and stirred for 40min to obtain a clear mixed solution.

[0038] (2) While stirring, use 0.8mol / L KOH solution to adjust the pH value of the mixed solution prepared in step (1) to 4.5, use deionized water to make the solution volume up to 70mL, and transfer it into a polytetrafluoroethylene stainless steel high-pressure In a hydrothermal reaction kettle, conduct a hydrothermal reaction at 180°C for 6 hours, and cool naturally to room temperature to obtain a solid-liquid system containing primary precipitates.

[0039] (3) Use 0.8 mol / L KOH solution to adjust the pH of the solid-liquid system obtained in step (2) to 9, stir for 40 minutes and let it stand for 7 hours, wash with deionized water and ethanol three times each, and remove the precipitate The material was dried at 70°C for 20 hours and ground to obtain the precursor.

[0040] (4) Heat-treat the...

Embodiment 3

[0044] (1) Take 1mol / L FeCl 3 and 0.1mol / L CaCl 2 10 mL each of the solution was mixed, and 1.5 g of Na 2 C 2 o 4 , mixed and stirred for 50 min to obtain a clear mixed solution.

[0045] (2) Under stirring, use 0.5mol / L ammonia water to adjust the pH value of the mixed solution prepared in step (1) to 5.5, use deionized water to dilute the solution to 100mL, and transfer it into PTFE stainless steel high-pressure water In a hot reaction kettle, hydrothermally react at 170°C for 7 hours, and cool down to room temperature naturally to obtain a solid-liquid system containing primary precipitates.

[0046] (3) Use 0.5 mol / L ammonia water to adjust the pH of the solid-liquid system obtained in step (2) to 9.5, stir for 50 minutes and let it stand for 6 hours, wash with deionized water and ethanol three times each, and remove the precipitate Dry at 90°C for 10 hours and grind to obtain the precursor.

[0047] (4) Heat-treat the precursor prepared in step (3) in an air atmosph...

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Abstract

The invention discloses a pn type CaFe2O4@alpha-Fe2O3 heterojunction compound photocatalyst and a preparation method and an application thereof. The preparation method comprises the following steps of: firstly, dissolving ferric chloride and calcium chloride in deionized water; then adding sodium oxalate and uniformly stirring the mixture to obtain a mixed solution; adjusting the pH value of the mixed solution with an alkaline solution, and transferring the mixed solution into a reaction kettle for a hydrothermal reaction; after the hydrothermal reaction, cooling the solution to room temperature for secondary settlement; then adjusting the pH value of the mixed solution with the alkaline solution; and finally, centrifugalizing, washing, drying and grinding the product and thermally treating the product within a short time to obtain a product. The preparation process is simple, the cost is low, the preparation cost is pollution-free, and the prepared catalyst has a structure of short sticks, granules or a short stick / granule mixed microstructure, has good photocatalytic activity and regenerating recyclability and can be effectively applied to photocatalytic degradation of organic dye pollutants in wastewater.

Description

technical field [0001] The invention belongs to the technical field of photocatalyst preparation, in particular to a pn type CaFe 2 o 4 @a-Fe 2 o 3 Heterojunction composite photocatalyst and its preparation method and application. Background technique [0002] Photocatalysis has the functions of energy saving, environmental protection and high efficiency, and it is expected to become the best way for human beings to solve the fossil energy crisis and water pollution. Photocatalyst is the decisive factor of photocatalytic reaction efficiency. In order to improve photocatalytic efficiency, constructing heterojunction composite photocatalytic materials to reduce the recombination rate of photogenerated electrons and holes has become a research and development hotspot in this field. At present, the heterojunction composite photocatalysts that have been researched and developed are mainly nn-type heterojunctions. Due to the lack of p-type oxide semiconductors, there are not m...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J35/00C02F1/30C02F101/30C02F101/36C02F101/38
CPCC02F1/30B01J23/002B01J23/78C02F2305/10C02F2101/36C02F2101/38C02F2101/40C02F2101/308B01J35/39Y02W10/37
Inventor 吴照金朱妍彭超刘伟明王平曹发斌
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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