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Bismuth oxyiodide/bismuth molybdate composite photocatalyst and preparation method thereof

A technology of bismuth oxyiodide and bismuth molybdate, which is applied in the field of photocatalysis, can solve the problems of easy recombination of photogenerated electrons and holes, limit the large-scale application of bismuth molybdate, achieve high-efficiency visible light catalytic activity, broaden the spectral response range, easy-to-use effects

Active Publication Date: 2014-12-10
日照经济技术开发区客商服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, bismuth molybdate is a typical bismuth-based photocatalyst with visible light photocatalytic performance, but it has the problem of easy recombination of photogenerated electrons and holes, which greatly limits the large-scale application of bismuth molybdate.

Method used

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  • Bismuth oxyiodide/bismuth molybdate composite photocatalyst and preparation method thereof
  • Bismuth oxyiodide/bismuth molybdate composite photocatalyst and preparation method thereof
  • Bismuth oxyiodide/bismuth molybdate composite photocatalyst and preparation method thereof

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preparation example Construction

[0015] A kind of preparation method of bismuth oxyiodide / bismuth molybdate composite photocatalyst of the present invention comprises the following steps:

[0016] (1) Preparation of bismuth oxyiodide: first dissolve the bismuth salt in a certain volume of alcohol solution, then dissolve the measured iodide in the alcohol solution, slowly add the latter to the former, stir for 0.5-1h, and then transfer to 50mL In a stainless steel autoclave with polytetrafluoroethylene lining, react at 100-180°C for 10-30 hours, centrifuge the obtained product, and dry it in vacuum at 50-80°C to obtain a bismuth oxyiodide sample;

[0017] (2) Preparation of bismuth oxyiodide / bismuth molybdate composite photocatalyst: Take 0.1-1.0 g of the bismuth oxyiodide sample prepared in step (1) and add it into alcohol solution for ultrasonic dispersion for 0.5-1 h, take a certain amount of molybdate and dissolve it in alcohol solution, then slowly add it into the dispersed bismuth oxyiodide alcohol solut...

Embodiment example 1

[0019] Embodiment example 1: the preparation method of a kind of bismuth oxyiodide / bismuth molybdate composite photocatalyst of the present invention comprises the following steps:

[0020] (1) Preparation of bismuth oxyiodide: first dissolve bismuth nitrate in a certain volume of ethylene glycol solution, then dissolve the metered ratio of sodium iodide in ethylene glycol solution, slowly add the latter to the former, stir for 0.5h, Then transfer it to a 50mL stainless steel autoclave lined with polytetrafluoroethylene, react at 160°C for 15h, centrifuge the obtained product, and dry it in vacuum at 50°C to obtain a bismuth oxyiodide sample;

[0021] (2) Preparation of bismuth oxyiodide / bismuth molybdate composite photocatalyst: Take 0.5 g of the bismuth oxyiodide sample prepared in step (1) and add it into ethylene glycol solution for ultrasonic dispersion for 0.5 h, and dissolve 0.15 g of sodium molybdate in ethylene glycol solution Then slowly add it into the dispersed bis...

Embodiment 2

[0023] Implementation example 2: the preparation method of a kind of bismuth oxyiodide / bismuth molybdate composite photocatalyst of the present invention comprises the following steps:

[0024] (1) Preparation of bismuth oxyiodide: first dissolve bismuth chloride in a certain volume of ethylene glycol solution, then dissolve the metered ratio of sodium iodide in ethylene glycol solution, slowly add the latter to the former, and stir for 0.5h , and then transferred to a 50mL stainless steel autoclave lined with polytetrafluoroethylene, reacted at 160°C for 15h, centrifuged the resulting product, and dried it in vacuum at 50°C to obtain a bismuth oxyiodide sample;

[0025] (2) Preparation of bismuth oxyiodide / bismuth molybdate composite photocatalyst: Take 0.5 g of bismuth oxyiodide sample prepared in step (1) and add it into ethylene glycol solution for ultrasonic dispersion for 0.5 h, and dissolve 0.11 g of sodium molybdate in ethylene glycol solution Then slowly add it into t...

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Abstract

The invention discloses a bismuth oxyiodide / bismuth molybdate composite photocatalyst and a preparation method thereof, belonging to the field of photocatalysis. The bismuth oxyiodide / bismuth molybdate composite photocatalyst is mainly characterized in that separation of photoinduced electrons and holes is facilitated due to a heterojunction structure formed by in-situ transformation of bismuth oxyiodide and bismuth molybdate, and the formed composite photocatalyst has relatively wide spectral response range, and achieves efficient visible light catalytic activity. The preparation method comprises the following steps: 1, preparation of bismuth oxyiodide, namely dissolving bismuth salt in an alcoholic solution of certain volume, slowly adding an iodide alcoholic solution at stoichiometric ratio, uniformly stirring, and preparing a sample through a solvothermal method; and 2, dispersing a certain quantity of bismuth oxyiodide samples prepared in the step 1 in the alcoholic solution, slowly adding a certain quantity of molybdate alcoholic solutions, uniformly stirring, feeding into a reaction kettle and performing a solvothermal in-situ conversion reaction, thus obtaining the bismuth oxyiodide / bismuth molybdate composite photocatalyst. The method is simple in process and low in cost, and the prepared bismuth oxyiodide / bismuth molybdate composite photocatalyst has efficient visible light catalytic activity.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and relates to the preparation of bismuth iodide oxide by a solvothermal method, and the preparation of a bismuth iodide oxide / bismuth molybdate composite photocatalyst by using a solvothermal in-situ conversion method, forming a p-n heterostructure, and accelerating the separation of electrons and holes , and broaden the spectral response range of the catalyst, and obtain a composite photocatalyst with superior performance. Background technique [0002] At present, the seriousness of environmental pollution has become a focal issue that directly threatens the survival of human beings and urgently needs to be resolved. Photocatalytic technology is a green technology that has been gradually developed since the 1970s and has important application prospects in the fields of energy and the environment. Since Fujishima and Honda, professors at the University of Tokyo in Japan, discovered in 1972 that Ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/132B01J35/02B01J37/08
Inventor 段芳张琴李娇娇张芬吴家浩魏取福陈明清
Owner 日照经济技术开发区客商服务有限公司
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