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Bi/BiOCl (bismuth oxychloride) composite photocatalyst as well as in-situ reduction preparation method and application thereof

A photocatalyst, catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as poor lattice matching, unfavorable charge transfer, etc., to improve photocatalytic ability, high ultraviolet Photocatalytic activity and visible light catalytic performance, controllable effect of in situ reduction process

Inactive Publication Date: 2014-07-09
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the BiOCl nanomaterial has a wide band gap and only responds to ultraviolet light, while commonly used chemical methods to deposit narrow-bandgap semiconductors, noble metal nanoparticles and other modification methods are easy to form nanoparticle agglomeration, and with The poor lattice matching between BiOCl is not conducive to the charge transfer between the two

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The Bi / BiOCl composite photocatalyst was prepared by the liquid phase reduction method, and the specific steps were as follows:

[0021] ① Preparation of BiOCl photocatalyst

[0022] 2mmol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 25 mL of ethylene glycol, 2 mmol of NaCl was dissolved in 25 mL of deionized water, and after complete dissolution, NaCl was slowly added dropwise to Bi(NO 3 ) 3 After fully reacting in the solution, the solution was transferred to a reaction kettle and kept at 150°C for 10h. The precipitate after the reaction was centrifuged and washed several times with absolute ethanol and deionized water respectively, and the obtained powder was dried in an oven at 40°C for later use.

[0023] ② Preparation of Bi / BiOCl composite photocatalyst

[0024] Take 0.5g of BiOCl powder in step ① and put it in 0.1mol / L KBH 4 In aqueous solution, ultrasonically react at 50°C for 10 minutes. After the reaction, the precipitate was centrifuged and washed several tim...

Embodiment 2

[0027] The preparation method of this embodiment is the same as embodiment 1, and the difference is that KBH in step 2. 4 The concentration was changed to 0.05mol / L.

[0028] The Bi / BiOCl photocatalyst synthesized by this process is about 100-600nm nanosheets, and the reduced Bi nanoparticles are evenly distributed on the nanosheets, and the particle size is about 5-20nm. Under the irradiation of ultraviolet light and visible light, it has good degradation ability to the simulated pollutant methyl orange. The methyl orange can be completely degraded within 10 minutes under ultraviolet light, and the degradation rate of visible light can exceed 70% within 1 hour. The effect is obviously better than that of BiOCl powder without reduction.

Embodiment 3

[0030] The preparation method of this embodiment is the same as embodiment 1, and the difference is that KBH in step 2. 4 The concentration was changed to 0.025mol / L.

[0031] The Bi / BiOCl photocatalyst synthesized by this process is about 100-600nm nanosheets, and the reduced Bi nanoparticles are evenly distributed on the nanosheets, and the particle size is about 5-20nm. Under the irradiation of ultraviolet light and visible light, it has good degradation ability to the simulated pollutant methyl orange. The methyl orange can be completely degraded within 10 minutes under ultraviolet light, and the degradation rate of visible light can exceed 70% within 1 hour. The effect is obviously better than that of BiOCl powder without reduction.

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Abstract

The invention relates to the technical field of nanometer materials and photocatalytic degradation of organic pollutants, and in particular relates to a Bi / BiOCl (bismuth oxychloride) composite photocatalyst as well as an in-situ reduction preparation method and application thereof. Bi nano-particles with particle sizes of 5-20nm are uniformly distributed on a BiOCl nanosheet with 100-600nm or a the surface of a BiOCl microsphere being 1-3 microns to obtain the Bi / BiOCl composite photocatalyst; the Bi / BiOCl composite photocatalyst is prepared by gaseous-phase in-situ reduction or liquid-phase in-situ reduction; as Bi nano-particles are formed on a BiOCl substrate in an in-situ manner, the lattice matching degree of interfaces between the Bi and the BiOCl is high and the charge migration is facilitated; the Bi nano-particles have the good dispersibility, are difficult to cause agglomeration, and have the good size and distribution controllability; the Bi nano-particles can be well combined with the BiOCl and are difficult to drop off, the photo catalytic capability of the BiOCl under the existence of ultraviolet light can be improved, the spectral response range is expanded, and the visible photo catalytic capability can be acquired, and the Bi / BiOCl composite photocatalyst can be effectively applied to photocatalytic degradation of organic pollutants in a water body.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and photocatalytic degradation of organic pollutants, in particular to a Bi / BiOCl composite photocatalyst, an in-situ reduction preparation method and an application thereof. Background technique [0002] With the rapid development of modern industry and agriculture, more and more organic pollutants such as industrial waste, domestic garbage, residual pesticides and chemical fertilizers enter the water bodies on which humans depend through various channels, and photocatalytic degradation technology is to solve organic pollution. It provides a green and reliable way to solve the problem of substances, and semiconductor photocatalyst is the key link in photocatalytic degradation technology. BiOCl is a new type of layered semiconductor compound. BiOCl with flake and flower spherical micro-nano structures shows good ultraviolet photocatalytic performance. The patent (publication number: CN10291...

Claims

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Application Information

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IPC IPC(8): B01J27/10B01J37/16C02F1/30C02F1/32
Inventor 徐光青胡家佳吕珺吴玉程
Owner HEFEI UNIV OF TECH
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