A kind of preparation method of polyoxometalate-based composite visible light catalyst

A polyoxometalate and visible light technology, applied in the field of photocatalytic materials, can solve the problem of low visible light response, and achieve the effects of high visible light activity, low cost and simple preparation method

Active Publication Date: 2020-06-16
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the visible light response of POMs is not high, and they can only use the ultraviolet region, which accounts for less of the total energy of sunlight.

Method used

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  • A kind of preparation method of polyoxometalate-based composite visible light catalyst
  • A kind of preparation method of polyoxometalate-based composite visible light catalyst
  • A kind of preparation method of polyoxometalate-based composite visible light catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1. Preparation method of AgHPMo:

[0033] (1) Dissolve 0.376g of silver nitrate in 10ml of distilled water, stir until completely dissolved to obtain reaction solution A; dissolve 0.5g of phosphomolybdic acid in 5ml of distilled water, stir magnetically, and fully dissolve to obtain reaction solution B;

[0034] (2) Add solution B dropwise to solution A, silver phosphomolybdate suspension, move the solution to a hydrothermal reaction kettle, conduct a hydrothermal reaction at 140°C for 2 hours, centrifuge, wash 3 times with distilled water, and dry to obtain AgHPMo (molar ratio of silver nitrate to phosphomolybdic acid 1:10).

[0035] 2. AgHPMo / Ag 3 VO 4 Preparation:

[0036] (1) Dissolve 0.376g of silver nitrate in 10ml of distilled water, stir until completely dissolved to obtain reaction solution A; dissolve 0.5g of phosphomolybdic acid in 5ml of distilled water, stir magnetically, and fully dissolve to obtain reaction solution B;

[0037] (2) Solution B is added...

Embodiment 2

[0048] The amount of sodium vanadate added will affect the Ag in the catalyst 3 VO 4 The content will also affect the dispersibility of the catalyst during preparation. Change AgHPMo / Ag in embodiment 1 3 VO 4 In the preparation method, the amount of sodium vanadate added, that is, the molar ratio of silver phosphomolybdate to silver vanadate, is used to prepare a series of catalysts.

[0049] Taking the degradation of chromium-containing Cr(VI) wastewater as an example to test the catalyst activity, add 50 mL of chromium-containing Cr(VI) wastewater with a concentration of 80 μmol / L to the reactor, and add 50 mg of AgHPMo / Ag prepared in different proportions 3 VO 4 Visible light catalyst, adjust pH = 2, continue to stir, stir in the dark for 30 minutes to adsorption equilibrium, turn on the visible light source, and take samples at intervals of 30 minutes.

[0050] Such as figure 1 , when the molar ratio of silver phosphomolybdate and silver vanadate is 1:10, the removal...

Embodiment 3

[0052] Adjusted different light time will affect the formation of simple Ag, the lack of simple Ag in the composite catalyst may lead to low reduction efficiency, and too much simple Ag will inhibit the formation of AgHPMo and Ag. 3 VO 4 The effect of the heterojunction, which leads to a decrease in the efficiency of reducing Cr(VI), so we can change the Ag@AgHPMo / Ag in Example 1 3 VO 4 In the preparation method, different illumination times are adjusted, a series of catalysts are prepared, and the chromium reduction operation in Example 2 is compared to obtain figure 2 .

[0053] Depend on figure 2 It can be seen that the reduction effect of Cr(VI) is the best when the light time is 30min, so the Ag@AgHPMo / Ag prepared by reducing for 30min 3 VO 4 The photocatalytic activity is the best.

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Abstract

The invention discloses a preparation method of a polyoxometallate-based composite visible-light photo-catalyst. The method includes the steps of: 1) dropwise adding an AgNO3 water solution to a phosphomolybdic acid water solution to prepare silver phosphomolybdate suspension liquid; 2) adding a sodium vanadate solution to the silver phosphomolybdate suspension liquid, uniformly mixing the solution, and moving the solution into a hydrothermal reaction kettle to perform hydrothermal reaction, and after the reaction is finished, and performing centrifugation, water washing and drying to obtain an intermediate AgHPMo / Ag3VO4; 3) adding methanol to the AgHPMo / Ag3VO4, removing oxygen, performing ultraviolet irradiation, and washing and drying the product. The method is simple, is easy to carry out, is low in cost, and not only maintains the photo-catalytic activity of the polyoxometallate but also overcomes the dissolubility of same.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to the technical field of visible light-responsive photocatalytic materials, in particular to a polyoxometalate-based composite visible light catalyst and a preparation method thereof. Background technique [0002] As an economical and environmentally friendly technology, photocatalytic technology has attracted much attention due to its wide application in the treatment of environmental pollutants, solar energy conversion, and organic synthesis. For example, in water treatment applications, TiO 2 The representative photocatalyst can generate photogenerated electron-hole pairs under ultraviolet light irradiation, which can restore and recover heavy metals while mineralizing and removing refractory organic matter. However, TiO 2 The band gap is wide, and it can only absorb ultraviolet light which accounts for less than 5% of solar energy, so the utilization rate of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/199C02F1/30C02F101/22
CPCB01J27/199B01J35/004C02F1/30C02F2101/22C02F2305/10
Inventor 张晨露王齐刘恩秦吴宏高桥远
Owner ZHEJIANG GONGSHANG UNIVERSITY
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