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Bismuth oxyiodide/bismuth molybdate composite photocatalyst and preparation method thereof

A technology of bismuth oxyiodide and compound light, which is applied in the field of photocatalysis, can solve the problems that limit the large-scale application of bismuth molybdate and the easy recombination of photogenerated electrons and holes, and achieve high-efficiency visible light catalytic activity, easy operation, and accelerated migration rate Effect

Active Publication Date: 2016-08-24
日照经济技术开发区客商服务有限公司
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  • Summary
  • 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 the bismuth oxyiodide sample prepared in step (1) and add it into ethylene glycol solution for ultrasonic dispersion for 0.5 h, and dissolve 0.11 g of sodium molybdate in ethylene glycol solution Then slowly add it in...

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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. Its main feature is that bismuth oxyiodide and bismuth molybdate form a heterogeneous structure through in-situ conversion, which is beneficial to the separation of photogenerated electrons and holes, and the formed composite photocatalyst has a wide spectral response range, and has efficient photocatalysis under visible light. active. The preparation steps are as follows: ① Preparation of bismuth oxyiodide: first dissolve the bismuth salt in a certain volume of alcohol solution, then slowly add the iodide alcohol solution in a metered ratio, stir evenly, and prepare the sample by solvothermal method. ② Take a certain amount of the bismuth oxyiodide sample prepared in step ① and disperse it in the alcohol solution, slowly add a certain amount of molybdate alcohol solution, stir evenly, put it into the reaction kettle for solvothermal in-situ conversion reaction, and obtain bismuth oxyiodide / bismuth molybdate composite photocatalyst. The method has simple process and low cost, and the prepared bismuth oxyiodide / bismuth molybdate composite photocatalyst has high-efficiency 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 Patents(China)
IPC IPC(8): B01J27/132B01J35/02B01J37/08B01J35/00
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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