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Bismuth/carbon nitride composite catalyst, and preparation method and applications thereof

A composite catalyst and bismuth-based technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of weak visible light response and low photocatalytic efficiency

Active Publication Date: 2018-01-26
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing photocatalysts generally have problems such as weak visible light response and low photocatalytic efficiency.

Method used

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  • Bismuth/carbon nitride composite catalyst, and preparation method and applications thereof
  • Bismuth/carbon nitride composite catalyst, and preparation method and applications thereof
  • Bismuth/carbon nitride composite catalyst, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0057] Bismuth / C 3 N 4 The preparation method of composite catalyst comprises the steps:

[0058] (1) Bi 2 o 3 / C 3 N 4 preparation of

[0059] The catalyst uses melamine, dicyandiamide and urea as C 3 N 4 precursors. In order to exclude carbon nitride (C 3 N 4) effect on the performance of the catalyst (the molar ratio of fixed elements Bi and C, the initial ratio is set to 1:2, that is, Bi:C=1:2) set five ratios 1:1 to 1:5. The specific method is as follows (take 1:2 as an example):

[0060] 1) Mix 0.526g urea (urea) with 4.85g bismuth nitrate pentahydrate (Bi(NO 3 ).5H 2 (purity: 99.0%) placed in an agate mortar and mixed evenly, after grinding finely, using a dropper to drop 4-5 drops of deionized water and continue grinding, finally showing a thick white paste.

[0061] 2) Mix 0.368g melamine with 4.85g bismuth nitrate pentahydrate (Bi(NO 3 ).5H 2 (purity 99.0%) was placed in an agate mortar and mixed evenly, and then step 1 was repeated.

[0062] 3) Mix ...

Embodiment 1

[0082] Catalysts containing 5 different components were selected, and the effectiveness of each component was determined by comparing their degradation performance. Depend on figure 1 , it can be found that when the light intensity is 100mW / m 2 , adding 50 mg of catalyst to 50 ml of 5 mg per liter of phenol solution, the trend of phenol degradation over time. Bi@Bi 2 o 3 -BiOI / C 3 N 4 It has the best degradation effect, and phenol is completely degraded in 60 minutes.

[0083] refer to figure 1 , found that although the degradation effect of the other four catalysts is not very good, and some are relatively poor, but through comparison, it can be found that:

[0084] 1) Compare g / C 3 N 4 and Bi 2 o 3 / C 3 N 4 In terms of degradation efficiency, it can be found that Bi 2 o 3 Doping can improve the catalytic degradation effect of the catalyst to a certain extent.

[0085] 2) Compare Bi 2 o 3 -BiOI / C 3 N 4 and Bi 2 o 3 / C 3 N 4 From the degradation efficie...

Embodiment 2

[0088] The effect of catalysts prepared from different carbon nitride precursors on the degradation performance of phenol was investigated. The experiment selects three common carbon nitride precursors, which are melamine, dicyandiamide and urea; respectively recorded as u-type Bi@Bi 2 o 3 -BiOI / C 3 N 4 (urea), m-type Bi@Bi 2 o 3 -BiOI / C 3 N 4 (melamine), d-type Bi@Bi 2 o 3 -BiOI / C 3 N 4 (dicyandiamide).

[0089] From the degradation effect diagram ( figure 2 ) It can be found that Bi@Bi prepared from three different precursors 2 o 3 -BiOI / C 3 N 4 It has a good degradation effect on phenol, but the m-type Bi@Bi 2 o 3 -BiOI / C3 N 4 (Using melamine as the precursor of carbon nitride) has the fastest degradation rate and can completely degrade phenol. The other two prepared catalysts also had good effects.

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Abstract

The invention discloses a bismuth / carbon nitride composite catalyst, and a preparation method and applications thereof. The preparation method comprises following steps: 1, C3N4 precursor and Bi2O3 precursor are mixed at a certain ratio so as to obtain a Bi2O3 / C3N4 powder; 2, the Bi2O3 / C3N4 powder and KI are mixed at a certain ratio, an obtained mixed material is dispersed in water, stirring is carried out continuously after uniform mixing, a diluted sulfuric acid solution is added dropwise with stirring, after reaction, centrifugation, water washing, drying, and grinding are carried out so asto obtain a Bi2O3-BiOI / C3N4 powder; 3, the Bi2O3-BiOI / C3N4 powder is dispersed in methanol, ultraviolet irradiation is carried out under anoxic conditions, and centrifugation, water washing, drying,and grinding are carried out so as to obtain Bi@Bi2O3-BiOI / C3N4. According to the preparation method, synchronous introduction of C3N4 in preparation process of Bi2O3 is capable of obtaining Bi2O3 / C3N4; Bi2O3-BiOI / C3N4 is prepared under KI etching effect; in-suit ultraviolet reduction of a part of Bi plasma is realized so as to realize improvement of visible light responsiveness, and Bi@Bi2O3-BiOI / C3N4 is obtained.

Description

technical field [0001] The invention relates to the technical field of high-efficiency visible light photocatalytic materials, in particular to a bismuth-based / C 3 N 4 Composite catalyst and its preparation method and application. Background technique [0002] In recent years, with the continuous development and progress of science and technology, while people enjoy many conveniences, environmental pollution and energy shortages present a severe development trend, which has also attracted widespread attention from people from all walks of life. On the one hand, under the tide of vigorously developing science and technology and industry, the three industrial wastes (waste water, waste gas, solid waste) are produced in the process of industrial and agricultural production and are discharged into the environment in large quantities, and migrate with the cycle of the natural environment. On the other hand, the continuous consumption of traditional non-renewable resources, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/16B01J37/34C02F1/30C02F101/34
Inventor 王齐吴宏高桥远黄思伟邹紫莹张晨露
Owner ZHEJIANG GONGSHANG UNIVERSITY
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