Method for removing hexavalent chromium in wide pH range by using ultrathin Bi24O31Br10 nanosheet through photocatalytic reduction
A bi24o31br10, hexavalent chromium technology, applied in chemical instruments and methods, physical/chemical process catalysts, reduced water/sewage treatment, etc., can solve problems such as low quantum yield, low solar energy utilization efficiency, and difficulty in removing hexavalent chromium. , to achieve the effects of good stability, simple removal process and operation, and high light energy utilization efficiency
Pending Publication Date: 2022-07-26
TIANJIN UNIV
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However, the current photocatalytic technology often encounters the limitations of low solar energy utilization efficiency and low quantum yield when solving the problem of reduction and removal of hexavalent chromium. h + , making it difficult to remove hexavalent chromium under alkaline conditions
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[0026] Preparation of ultrathin Bi 24 O 31 Br 10 Nanosheet photocatalysts. First measure 40ml of deionized water into a 100mL beaker, then dissolve 1mmol (0.119g) of analytically pure KBr (CAS: 7758-02-3) in deionized water, and then take 4mmol (0.697g) of analytically pure L-precipitation Amino acid (CAS: 74-79-3) was dissolved in the above solution under magnetic stirring. After 2 minutes of magnetic stirring, 1 mmol (0.485 g) of analytically pure Bi(NO) was added to the above clear and transparent solution. 3 ) 3 ·5H 2 O(CAS: 10035-06-0). The obtained mixture solution was continuously magnetically stirred at room temperature for 1 hour, and a pale yellow precipitate was formed at the same time. The formed precipitate was collected by centrifugation, washed three times with distilled water and ethanol, respectively, to remove the impurity ions attached to the surface, and finally dried in a blast drying oven at 60 °C for 12 h, and the dried samples were ground to obta...
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Abstract
The invention belongs to the technical field of environmental protection, and particularly relates to a method for removing hexavalent chromium in a wide pH range by using ultrathin Bi24O31Br10 nanosheets through photocatalytic reduction. Comprising the following steps: (1) preparing an ultrathin Bi24O31Br10 nanosheet photocatalyst; (2) adding the synthesized visible light photocatalyst into solutions containing 30mg / L of hexavalent chromium under different pH values; (3) starting a magnetic stirrer, and carrying out dark adsorption for 1 hour to enable hexavalent chromium to reach adsorption equilibrium on the synthesized ultrathin Bi24O31Br10 nanosheet with Bi vacancy; (4) using a 300W xenon lamp provided with a 420nm optical filter as a visible light source, and turning on the light source to carry out light treatment on the hexavalent chromium-containing solution; and (5) after the illumination reaction is finished, discharging the precipitated supernatant, recovering the photocatalytic material naturally settled in the settling tank, and sending the photocatalytic material back to the photocatalytic reaction tank. According to the method, the ultrathin Bi24O31Br10 nanosheet photocatalyst is utilized, efficient photocatalytic reduction removal of hexavalent chromium in a wide pH range is achieved, and the method has the advantages of being simple in process, energy-saving, efficient, free of secondary pollution, high in pH fluctuation resistance and the like.
Description
technical field [0001] The invention belongs to the technical field of environmental protection, in particular to a kind of ultra-thin Bi 24 O 31 Br 10 Photocatalytic reduction of nanosheets for removal of hexavalent chromium in a wide pH range Background technique [0002] With the rapid development of industrialization and urbanization, water pollution poses a serious threat to the ecological environment and human health, especially heavy metal pollution. The wide application of hexavalent chromium and its carcinogenicity to humans and high toxicity to the environment have made hexavalent chromium removal attract widespread attention. Photocatalytic technology has broad application prospects in water treatment due to its simple operation, low energy consumption, green and high efficiency. However, the current photocatalytic technology often encounters the limitation of low solar energy utilization efficiency and low quantum yield when solving the problem of reduction a...
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IPC IPC(8): C02F1/70C02F1/30B01J27/06C02F101/22
CPCC02F1/705C02F1/30B01J27/06B01J35/004B01J35/0013C02F2101/22C02F2305/10
Inventor 李艳芳于涛谭欣
Owner TIANJIN UNIV
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