Method for preparing tungsten photocatalyst heterojunction through doping induction
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A photocatalyst and heterojunction technology, applied in the field of materials, can solve the problems of high carrier interface transport energy barrier, lower carrier energy, unstable combination of "junction" structure, etc., so as to improve the photocatalytic performance and energy. Effects with structural optimization
Pending Publication Date: 2020-03-24
哈尔滨芳新佳环保科技有限公司
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Problems solved by technology
Although the above-mentioned efficiency improvement strategies have been widely adopted, and the performance of photocatalysts has also been greatly improved, the effect of the improvement is not significant, and there are many technical bottlenecks.
For example, the "junction" structure generally has carrier energy reduction, the carrier interface transport energy barrier is too high, and the "junction" structure is unstable and easy to separate, etc.
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Embodiment 1
[0026] The method for preparing a tungsten-based photocatalyst heterojunction photocatalyst induced by doping with alkali metal Na ions comprises the following steps:
[0027] (1) 0.005mol of sodium tungstate (Na 2 WO 4 2H 2 O), 0.025 sodium sulfate (Na 2 SO 4 ) and 0.1 citric acid (C 6 h 8 o 7 ) was quickly dissolved in 50mL of deionized water under vigorous magnetic stirring, and continued to stir for 10 minutes after it was completely dissolved;
[0028] (2) Add hydrochloric acid (HCl) drop by drop with a pipette gun to adjust the pH to 1.8, and continue stirring for 10 minutes after the pH reading is stable;
[0029] (3) The above solution was then transferred to a polytetrafluoroethylene reactor, and reacted at a high temperature of 150°C for 24 hours in a hydrothermal oven, and precipitated at the bottom of the reactor after the reaction;
[0030] (4) Centrifuge the precipitated sample obtained above, wash three times with deionized water, and then wash three tim...
Embodiment 2
[0048] A method for preparing a tungsten-based photocatalyst heterojunction photocatalyst induced by doping with alkali metal K ions comprises the following steps:
[0049] (1) 3g potassium tungstate (K 2 WO 4 2H 2 O), 1.84g potassium sulfate (K 2 SO 4 ) and tartaric acid under intense magnetic stirring conditions, quickly dissolved in 50mL of deionized water, after waiting for it to dissolve completely, continue to stir for 10min;
[0050] (2) Add hydrochloric acid (HCl) dropwise with a pipette gun to adjust pH=2.5;
[0051] (3) The above solution was then transferred to a polytetrafluoroethylene reactor, and reacted at a high temperature of 180°C for 30 hours in a hydrothermal oven, and precipitated at the bottom of the reactor after the reaction;
[0052] (4) Centrifuge the precipitated sample obtained above, wash it three times with deionized water, and then wash it three times with absolute ethanol, and then dry the obtained wet sample in a hydrothermal oven at 60°C ...
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Abstract
The invention belongs to the field of materials, and particularly relates to an in-situ heterojunction photocatalyst and a preparation method and application thereof. The tungsten heterojunction photocatalyst provided by the invention is of a core-shell structure, wherein the inner layer and the outer layer of the photocatalyst are tungsten semiconductor oxides with different structures. Through diffusion of doping ions in crystal lattices, the shell structure is controllably adjusted under the induction of the doping ions, so tungsten heterojunction photocatalysts with different junction structures are obtained, and the toptimization of photo-induced electron-hole transport, separation efficiency and an energy band structure is realized; and thus, the photocatalytic performance of the heterojunction photocatalyst is remarkably improved. Results in embodiments show that when the heterojunction photocatalyst provided by the invention is used for photocatalytic decomposition of water, the generation amount of oxygen can reach 210 [mu]mol / h / g; when the heterojunction photocatalyst provided by the invention is used for degrading azo macromolecular rhodamine B (RhB), the degradation rate of RhB with a high concentration of 100 mg / L reaches 93% after degrading for 60 minutes, and the degradation rate of formaldehyde with a high concentration of 10 mg / L reaches 89% after degrading for180 minutes.
Description
technical field [0001] The invention belongs to the field of materials, and specifically relates to a method for in-situ doping induction to prepare a heterojunction of tungsten-based photocatalysts, in particular to a simple control of the crystal phase composition of the inner and outer layers by diffusion of doped ions in tungsten oxide channels And the surface structure of the catalyst, and the preparation method of different heterojunctions, so as to control the photocatalytic performance and application of the tungsten-based photocatalyst heterojunction. Background technique [0002] In the past few decades, the rapid development of science and technology has brought about rapid changes in human life. However, due to the excessive dependence of human beings on fossil fuels such as petroleum, coal, natural gas, etc. without delay. In the exploration of various new energy sources, it is found that the direct conversion of solar energy into chemical energy is considered...
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