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Silver halide/ silver phosphate heterojunction membrane visible photo-catalysis material and preparation method thereof

A catalytic material, silver phosphate technology, applied in the field of photocatalytic materials, can solve problems such as difficulty in recycling, and achieve the effect of solving difficult recycling, easy operation, and improving photocatalytic activity

Inactive Publication Date: 2012-10-03
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most heterojunction photocatalysts are in powder configuration, which is difficult to recover during use

Method used

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  • Silver halide/ silver phosphate heterojunction membrane visible photo-catalysis material and preparation method thereof
  • Silver halide/ silver phosphate heterojunction membrane visible photo-catalysis material and preparation method thereof
  • Silver halide/ silver phosphate heterojunction membrane visible photo-catalysis material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Electrodeposition of Ag on the surface of ITO to prepare ITO / Ag film: ITO is the research electrode, the platinum electrode is the auxiliary electrode, and the mercury-mercurous sulfate electrode (Hg 2 SO 4 / Hg, the salt bridge is saturated potassium sulfate solution) as the reference electrode, and the electrolyte is 20 mL containing 0.1 mol L -1 AgNO 3 and 0.1 mol L -1 KNO 3 Add 4mL of ammonia water and mix evenly, and deposit at -1 V at a constant potential, with a deposition charge of 1 coulomb, to obtain an ITO / Ag film;

[0023] (2) Na 2 HPO 4 , NaCl and PVP are dissolved in water together to prepare an electrolyte, and the Na in the prepared electrolyte 2 HPO 4 The solution concentration is 0.2 mol / L, the NaCl solution concentration is 0.005 mol / L, and the PVP solution concentration is 0.05 mol / L;

[0024] (3) ITO / Ag film anodized to AgCl / Ag 3 PO 4 Membrane: The ITO / Ag membrane prepared in step (1) is used as the research electrode, the platinum e...

Embodiment 2

[0026] (1) Electrodeposit Ag on the surface of Cu sheet to prepare Cu / Ag film: Cu sheet is used as research electrode, platinum electrode is used as auxiliary electrode, mercury-mercurous sulfate electrode (Hg 2 SO 4 / Hg, the salt bridge is saturated potassium sulfate solution) as the reference electrode, and the electrolyte is 20 mL containing 0.1 mol / L AgNO 3 and 0.1 mol / L KNO 3 Add 4mL of ammonia water and mix evenly, and deposit at -1 V at a constant potential with a deposition charge of 1 coulomb to obtain a Cu / Ag film;

[0027] (2) Na 2 HPO 4 , NaCl and PVP are dissolved in water together to prepare an electrolyte, and the Na in the prepared electrolyte 2 HPO 4 The solution concentration is 0.5 mol / L, the NaCl solution concentration is 0.005 mol / L, and the PVP solution concentration is 0.05 mol / L;

[0028] (3) Cu / Ag film anodized to AgCl / Ag 3 PO 4 Membrane: The Cu / Ag film prepared in step (1) is used as the research electrode, the platinum electrode is used as t...

Embodiment 3

[0030](1) Electrodeposit Ag on the surface of Si sheet to prepare Si / Ag film: semiconductor Si sheet is used as research electrode, platinum electrode is used as auxiliary electrode, mercury-mercurous sulfate electrode (Hg 2 SO 4 / Hg, the salt bridge is saturated potassium sulfate solution) as the reference electrode, and the electrolyte is 20 mL containing 0.1 mol / L AgNO 3 and 0.1 mol / L KNO 3 Aqueous solution, add 4mL of ammonia water and mix evenly, and conduct potentiostatic deposition at -1 V for 60 seconds to obtain Si / Ag film;

[0031] (2) Na 2 HPO 4 , NaBr and PVP are dissolved in water together to prepare an electrolyte, and the Na in the prepared electrolyte 2 HPO 4 The concentration of the solution is mol / L, the concentration of the NaBr solution is 0.02 mol / L, and the concentration of the PVP solution is 0.005 mol / L;

[0032] (3) Si / Ag film anodized to AgBr / Ag 3 PO 4 Membrane: The Si / Ag film prepared in step (1) is used as the research electrode, the platin...

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Abstract

The invention discloses a silver halide / silver phosphate heterojunction membrane visible photo-catalysis material and a preparation method thereof. The chemical formula of the silver halide / silver phosphate heterojunction membrane visible photo-catalysis material is AgX / Ag3PO4, wherein X is Cl, Br or I. The method comprises the following steps of: dissolving phosphate, halide and polyvinyl pyrrolidone into water to form electrolyte, performing anodic oxidation for 20 to 50 minutes under the potential of 0 to 1V by using a Ag membrane as a research electrode, using a platinum electrode as an auxiliary electrode and using a mercury-mercurous sulfate as a reference electrode, flushing the obtained material by using distilled water, naturally drying in air in dark, and thus obtaining the silver halide / silver phosphate heterojunction membrane visible photo-catalysis material, wherein the Ag membrane is a silver foil of which the purity is more than 99 percent or is prepared from conductive matrix by a deposition process, and the purities of the chemical reagents are greater than chemical purities. Through a prepared heterojunction membrane, the photo-catalytic activity of the silver phosphate can be improved, and the problem that powdery photo-catalyst is difficult to recover is solved at the same time.

Description

technical field [0001] The technical field of the invention belongs to the technical field of photocatalytic materials, and in particular relates to a silver halide / silver phosphate heterojunction visible light catalytic material and a preparation method thereof. Background technique [0002] Semiconductor photocatalytic materials can be used as catalysts to degrade pollutants in air or water by utilizing solar energy. Especially in terms of environmental governance, photocatalytic degradation technology is gradually becoming a supplement and improvement to traditional pollution control technologies. Its biggest advantage is that the degradation reaction is generally carried out at normal temperature and pressure, which can completely decompose organic pollutants in water and air, and mineralize them into CO 2 and H 2 O. Semiconductor photocatalytic materials have many functions such as oxidative decomposition of organic pollutants, reduction of heavy metal ions, deodoriz...

Claims

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Application Information

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IPC IPC(8): B01J27/18B01J37/34
Inventor 刘勇平方亮吕慧丹徐旭芦璐冯佰军张艳飞
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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