Ag/Ag2Mo2O7/WS2 heterojunction photocatalytic material and preparation method thereof

A photocatalytic material, ag2mo2o7 technology, applied in the field of photocatalytic degradation of organic pollutants, can solve the problems of photocatalytic performance to be further improved, low separation efficiency of photogenerated carriers, and narrow spectral response range, so as to improve photocatalytic performance, Effects of promoting photocatalytic efficiency, promoting separation and migration

Active Publication Date: 2020-12-25
泰州润瀚环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, there are few studies on the photocatalytic performance of silver molybdate, which is mainly due to the narrow spectral response range of silver molybdate materials and the low separation efficiency of photogenerated carriers.
In response to this problem, there have been a small amount of photocatalytic research on silver molybdate-based composite materials recently. However, the synthesis steps of these composite materials are relatively cumbersome, and the photocatalytic performance needs to be further improved.

Method used

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  • Ag/Ag2Mo2O7/WS2 heterojunction photocatalytic material and preparation method thereof
  • Ag/Ag2Mo2O7/WS2 heterojunction photocatalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Weigh 1.5g of WS 2 The powder was dissolved in a mixed solution of 150mL ethanol and water, stirred evenly and then ultrasonicated for 5 hours, the resulting dispersion was centrifuged at a speed of 2400rmp, and the supernatant was taken as the stripped WS 2 nanosheet suspension;

[0021] (2) Prepare 0.1mol / L AgNO respectively 3 and 0.1mol / L Na 2 MoO 4 2H 2 O aqueous solution, and sequentially added dropwise to the WS in step (1) 2In the nanosheet suspension, make the molar ratio of Ag, Mo, and W in the mixed system 2:2:1, add 2mL polyvinylpyrrolidone as a stabilizer, continue stirring for 0.6h, add nitric acid to adjust the pH of the system to 3, continue Stir for 20 minutes, transfer the resulting mixture into a polytetrafluoroethylene-lined stainless steel reactor, heat up to 140°C for hydrothermal reaction for 20 hours, after the reaction is completed, naturally cool to room temperature, filter, and wash to obtain heterojunction Ag 2 Mo 2 o 7 / WS 2 comp...

Embodiment 2

[0024] (1) Weigh 2g of WS 2 The powder was dissolved in a mixed solution of 150mL ethanol and water, stirred evenly and then ultrasonicated for 8 hours, the resulting dispersion was centrifuged at a speed of 2000rmp, and the supernatant was taken as the stripped WS 2 nanosheet suspension;

[0025] (2) Prepare 0.1mol / L AgNO respectively 3 and 0.1mol / L Na 2 MoO 4 2H 2 O aqueous solution, and sequentially added dropwise to the WS in step (1) 2 In the nanosheet suspension, make the molar ratio of Ag, Mo, and W in the mixed system 1.7:1.7:1, add 2mL polyvinylpyrrolidone as a stabilizer, keep stirring for 0.6h, add nitric acid to adjust the pH of the system to 3, continue Stir for 30 minutes, transfer the resulting mixture into a polytetrafluoroethylene-lined stainless steel reactor, raise the temperature to 130°C for hydrothermal reaction for 18 hours, after the reaction is completed, naturally cool to room temperature, filter, and wash to obtain heterojunction Ag 2 Mo 2 o ...

Embodiment 3

[0028] Prepare 100ml of 0.1mM rhodamine B aqueous solution as simulated organic pollutant wastewater, add 5mg of photocatalytic material into the above rhodamine B aqueous solution, and stir for 2 hours in the dark to reach adsorption equilibrium. Using a 300W xenon lamp as the light source, the visible light was obtained through an ultraviolet filter, and the above system was irradiated for 1 hour to conduct a photocatalytic degradation test; for comparison, Ag 2 Mo 2 o 7 、WS 2 、Ag 2 Mo 2 o 7 / WS 2 The composite material was also subjected to the above photocatalytic degradation test; figure 2 That is to say, the Ag prepared by steps (1) and (2) in Example 1 of the present invention 2 Mo 2 o 7 / WS 2 Composite material, Ag / Ag prepared through steps (1)-(3) 2 Mo 2 o 7 / WS 2 Heterojunction photocatalytic materials and commercial Ag 2 Mo 2 o 7 and WS 2 The photocatalytic degradation efficiency of rhodamine B was determined by figure 2 It can be clearly seen t...

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Abstract

The invention relates to a Ag / Ag2Mo2O7 / WS2 heterojunction photocatalytic material and a preparation method thereof, and belongs to the technical field of photocatalytic degradation of organic pollutants. According to the preparation method, Ag2Mo2O7 nanocrystals grow on the surface of a WS2 nanosheet through an in-situ hydrothermal method for the first time, and a large amount of Ag<0> is doped onthe surface of a composite material through photochemical reduction, so that the Ag / Ag2Mo2O7 / WS2 heterojunction photocatalytic material is obtained. Compared with a Ag2Mo2O7 / WS2 composite material and commercial Ag2Mo2O7 and WS2, the Ag / Ag2Mo2O7 / WS2 heterojunction photocatalytic material prepared in the invention has more excellent photocatalytic degradation efficiency on organic pollutants, andthe preparation method is simple, high in product yield, high in product purity and considerable in application prospect.

Description

technical field [0001] The present invention relates to a kind of Ag / Ag 2 Mo 2 o 7 / WS 2 A heterojunction photocatalytic material and a preparation method thereof belong to the technical field of photocatalytic degradation of organic pollutants. Background technique [0002] Numerous research results in the field of photocatalysis have shown that highly active photocatalytic materials should have a light absorption range that matches the solar spectrum and a high migration rate of photogenerated carriers. Silver-containing semiconductor materials have shown good photocatalytic activity due to their narrow band gap, small effective mass of electrons and holes, and have become a research hotspot in the field of visible light catalysis. Among them, there are few studies on the photocatalytic performance of silver molybdate, which is mainly due to the narrow spectral response range of silver molybdate material and the low separation efficiency of photogenerated carriers. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051C02F1/30C02F101/30C02F101/38
CPCB01J27/051B01J35/004C02F1/30C02F2101/30C02F2101/38C02F2305/10
Inventor 朱轶宁徐卿孙峰
Owner 泰州润瀚环境科技有限公司
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