Preparation method and application of bismuth oxybromide/biochar composite visible-light-induced photocatalyst

A technology of bismuth oxybromide and biochar, which is applied in the field of photocatalysis, can solve the problems of small specific surface area of ​​biochar adsorption materials and cannot be reused, and achieve excellent photocatalytic degradation activity of pollutants, good adsorption capacity, and enhanced adsorption capacity. Effect

Inactive Publication Date: 2021-03-12
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0003] The problem to be solved by the present invention is: to provide a preparation method of bismuth oxybromide / biochar composite visible light catalyst, which can solve the problems that the existing biochar adsorption materials have small specific surface area, no photocatalytic activity, and cannot be reused

Method used

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  • Preparation method and application of bismuth oxybromide/biochar composite visible-light-induced photocatalyst
  • Preparation method and application of bismuth oxybromide/biochar composite visible-light-induced photocatalyst

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Embodiment 1

[0026] Step 1. Preparation of biochar powder: Weigh 20 g of bamboo charcoal and put it into a mortar, grind it thoroughly to obtain biochar powder, which is recorded as Biochar;

[0027] Step 2. Preparation of bismuth oxybromide powder: Weigh 6 g of bismuth nitrate pentahydrate, add 150 ml of deionized water, and stir at 20-30°C for 15 min to obtain an aqueous solution of bismuth nitrate. Weigh 4.508 g of cetyltrimethylammonium bromide, add it to the bismuth nitrate solution, and stir for 30 min at 20-30 °C. Put the mixed solution into a reaction kettle, place it in an oven at 160 °C for 18 h, take it out, centrifuge it, wash it three times with deionized water and absolute ethanol, and then dry it. Carry out calcining, fully grind after cooling, obtain bismuth oxybromide powder, denote as BiOBr;

[0028] Step 3. Preparation of bismuth oxybromide / biochar composite visible light catalyst: Weigh 1.4 g of biochar powder obtained in step 1 and 0.6 g of bismuth oxybromide powder o...

Embodiment 2

[0030] Embodiment 2: The difference from Example 1 is: 0.6 g of biochar powder is weighed in step 1, 1.4 g of bismuth oxybromide powder is weighed in step 2, and the obtained bismuth oxybromide / biochar composite visible light catalyst is denoted as 70% BiOBr / Biochar.

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Abstract

The invention discloses a preparation method and application of a bismuth oxybromide / biochar composite photocatalyst, and aims at solving the problems that an existing biochar adsorbent cannot be repeatedly used and is small in adsorption capacity to prepare the bismuth oxybromide / biochar composite photocatalyst. According to the preparation method, adopting hydrothermal method firstly to synthesis bismuth oxybromide, then preparing the bismuth oxybromide / biochar composite visible-light-induced photocatalyst with high specific surface area by adopting a ball milling method. According to the photocatalyst disclosed by the invention, biochar with good adsorption performance and BiOBr are subjected to ball-milling mixing, so that the adsorption capacity of Biochar to organic pollutants is improved, meanwhile, compared with Biochar, the capacity of the bismuth oxybromide / biochar compound for synergistically adsorbing and degrading the organic pollutants under visible light is further enhanced, and the photocatalytic material can be applied to visible light catalytic degradation of pollutants in the field of energy. And the biochar is provided with the capability of repeated use.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a preparation method and application of a bismuth oxybromide / biochar composite visible light catalyst. Background technique [0002] In recent years, energy shortage and environmental pollution have been two major crises that threaten the long-term stable development of human society. The research and development of green and sustainable new materials has always been a hot topic of research. Biochar, a porous carbon-based material, has been widely used as an adsorbent for the adsorption and treatment of pollutants in the environment. However, as an adsorbent, it does not have photocatalytic activity, so the adsorption of organic pollutants can only be performed once. Bismuth oxybromide (BiOBr) has visible light activity, can absorb part of visible light and has good chemical stability, and its preparation process is simple. As a photocatalyst, it has a good application pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J21/18B01J27/32B01J35/00B01J37/00C02F1/30C02F101/30
CPCB01J27/06B01J21/18B01J35/004B01J37/0036B01J27/32C02F1/30C02F2305/10C02F2101/30
Inventor 罗一丹程伊薛名山谢宇吴雯艳吴蓓殷祚炷洪珍
Owner NANCHANG HANGKONG UNIVERSITY
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