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BiOCOOH/g-C3N4 composite photocatalyst and preparation method and application thereof

A g-c3n4, composite light technology, applied in catalyst activation/preparation, organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, etc., can solve the complex synthesis process, affect practical application, and increase cost and other problems, to achieve the effect of high catalytic activity, high degradation efficiency and simple process

Inactive Publication Date: 2018-11-13
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently used with g-C 3 N 4 Most of the composite materials are semiconductor materials with high price or complicated synthesis process, which leads to increased cost, which reduces the g-C 3 N 4 Advantages as an inexpensive catalyst, thereby affecting its practical application

Method used

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  • BiOCOOH/g-C3N4 composite photocatalyst and preparation method and application thereof
  • BiOCOOH/g-C3N4 composite photocatalyst and preparation method and application thereof
  • BiOCOOH/g-C3N4 composite photocatalyst and preparation method and application thereof

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preparation example Construction

[0056] According to a second aspect of the present invention, there is provided a BiOCOOH / g-C 3 N 4 The preparation method of composite photocatalyst comprises the following steps:

[0057] will g-C 3 N 4 , soluble bismuth salt and solvent to synthesize BiOCOOH / g-C by hydrothermal method 3 N 4 Composite photocatalyst; soluble bismuth salt and g-C 3 N 4 The molar ratio is (0.15~4.75):1.

[0058] Soluble Bismuth Salt and g-C 3 N 4 Typical but non-limiting molar ratios are, for example, 0.15:1, 0.25:1, 0.3:1, 0.5:1, 0.8:1, 1:1, 1.2:1, 1.5:1, 1.8:1, 2:1 , 2.5:1, 3:1, 4:1, or 4.75:1.

[0059] Hydrothermal synthesis refers to the synthesis by chemical reaction of substances in aqueous solution at a temperature of 100-1000°C and a pressure of 1MPa-1GPa. Under hydrothermal conditions, because the reaction is at the molecular level, the reactivity is enhanced, so hydrothermal reactions can replace some high-temperature solid-state reactions. Use hydrothermal method to synth...

Embodiment 1

[0107] A BiOCOOH / g-C 3 N 4 Composite photocatalyst, flower-like BiOCOOH embedded in g-C 3 N 4 In the sheet structure; BiOCOOH and g-C 3 N 4 The molar ratio is 3:1;

[0108] The above BiOCOOH / g-C 3 N 4 The preferred preparation method of composite photocatalyst comprises the following steps:

[0109] (1) Add 1 mmol of bismuth nitrate pentahydrate to 5 mL of N, N-dimethylformamide, and mix well at room temperature until transparent;

[0110] (2) Add 40mL of deionized water and mix ultrasonically for 5min;

[0111] (3) Add 0.031g g-C 3 N 4 Powder, ultrasonically mixed for 5 minutes;

[0112] (4) Transfer the suspension obtained in step (3) into a 100mL stainless steel autoclave lined with polytetrafluoroethylene, and keep it warm at 130°C for 11h;

[0113] (5) The product obtained in step (4) was centrifuged, washed three times with deionized water and absolute ethanol, dried at 70°C for 10 hours, and ground to obtain BiOCOOH / g-C with a particle size of about 1200nm ...

Embodiment 2

[0115]A BiOCOOH / g-C 3 N 4 Composite photocatalyst, flower-like BiOCOOH embedded in g-C 3 N 4 In the sheet structure; BiOCOOH and g-C 3 N 4 The molar ratio is 0.25:1;

[0116] The above BiOCOOH / g-C 3 N 4 The preferred preparation method of composite photocatalyst comprises the following steps:

[0117] (1) Add 1 mmol of bismuth nitrate pentahydrate to 5 mL of N, N-dimethylformamide, and mix well at room temperature until transparent;

[0118] (2) Add 40mL of deionized water and mix ultrasonically for 5min;

[0119] (3) Add 0.368g g-C 3 N 4 Powder, ultrasonically mixed for 5 minutes;

[0120] (4) Transfer the suspension obtained in step (3) into a 100mL stainless steel autoclave lined with polytetrafluoroethylene, and keep it warm at 130°C for 11h;

[0121] (5) Centrifuge the product obtained in step (4), wash with deionized water and absolute ethanol for 5 times, dry at 50°C for 14 hours, and grind to obtain BiOCOOH / g-C with a particle size of about 300nm 3 N 4 co...

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Abstract

The invention discloses a BiOCOOH / g-C3N4 composite photocatalyst and a preparation method and application thereof and relates to the technical field of photocatalysis. In the BiOCOOH / g-C3N4 compositephotocatalyst, the BiOCOOH is inlaid in the lamellar structure of the g-C3N4; and the molar ratio of the BiOCOOH to the g-C3N4 is (0.15-4.75):1. The composite photocatalyst has stronger visible lightresponse capability, higher photo-induced electron-hole pair separation efficiency, high catalytic activity and high efficiency of visible light catalytic degradation of organic dye-containing wastewater. The preparation method comprises the following steps of synthesizing the composite photocatalyst from the g-C3N4, soluble bismuth salt and a solvent through a hydrothermal method, wherein the molar ratio of the soluble bismuth salt to the g-C3N4 is (0.15-4.75):1. The preparation method has the advantages that the raw materials are cheap and easy to obtain, the process is simple, the operationis simple and convenient, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of preparation of nano functional materials and photocatalysis, in particular to a BiOCOOH / g-C 3 N 4 Composite photocatalyst and its preparation method and application. Background technique [0002] With the rapid development of modern society and economy, the problems of environmental pollution and energy crisis have become more and more serious, which have seriously threatened human health and social development. Semiconductor photocatalysis technology has shown superior performance in solving environmental pollution and energy crisis, the application of semiconductor photocatalysts in the conversion of solar energy into chemical energy and electrical energy, and the degradation of organic pollutants into small molecules of H by semiconductor photocatalysts 2 O and CO 2 , all show its very good application prospects. [0003] Some traditional semiconductor photocatalysts, such as TiO 2 Although photoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J31/04B01J37/10B01J37/08C02F1/30C02F101/38
CPCC02F1/30B01J27/24B01J31/04B01J37/082B01J37/10C02F2305/10C02F2101/38C02F2101/308B01J35/39
Inventor 程修文崔雨琦黄燕张新怡李波
Owner LANZHOU UNIVERSITY
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