Method for preparing simply regulated and controlled different-crystal-form bismuth-titanium composite oxide photocatalysts and application of method

A technology of titanium composite oxide and photocatalyst, which is applied in the fields of physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc. It can solve the problems of difficult to effectively use sunlight, large band gap, and low quantum yield, etc. problem, achieve good application prospects, simple equipment, and simple synthesis process

Inactive Publication Date: 2017-03-29
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

TiO 2 Photocatalysts are a research hotspot in the field of environmental and energy chemistry: TiO 2 Efficient and non-toxic, but its large band gap and low quantum yield make it difficult to effectively use sunlight, so one of the hot spots in photocatalytic material research is to develop new semiconductor photocatalysts with higher activity

Method used

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  • Method for preparing simply regulated and controlled different-crystal-form bismuth-titanium composite oxide photocatalysts and application of method
  • Method for preparing simply regulated and controlled different-crystal-form bismuth-titanium composite oxide photocatalysts and application of method
  • Method for preparing simply regulated and controlled different-crystal-form bismuth-titanium composite oxide photocatalysts and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: bismuth chloride (BiCl 3 ) in 20 ml N,N dimethylformamide and 5 ml acetic acid; add 2 g polyvinylpyrrolidone (PVP), stir until the solution is clear; drop n-butyl titanate (Ti(OiPr) 4 ) solution, stirred for 2 h to form a uniform yellow and transparent spinning precursor solution. Take the precursor solution into the syringe, put it into the electrospinning equipment, and perform spinning. The obtained fibers are calcined at a temperature of 300 o C-700 oC , and finally cooled to room temperature in air to obtain bismuth titanate composite oxides of different crystal forms.

[0023] The specific steps are:

[0024] 1. Dissolve 0.315 g of bismuth chloride in 20 ml of N,N dimethylformamide and 5 ml of acetic acid, and stir until clear.

[0025] 2. While stirring, add 2 g of polyvinylpyrrolidone to the above solution, and stir until clear.

[0026] 3. Add 0.34 ml of n-butyl titanate solution dropwise to the above solution, and stir for 2 hours to form a...

Embodiment 2

[0030] Under simulated sunlight irradiation, the photocatalyst prepared by the preparation method in Example 1 was used to photocatalyze the 50 mg / L tetracycline hydrochloride solution respectively.

[0031] 1. Weigh 100 mg of the photocatalyst obtained by the preparation method in Example 1 and place it in a photocatalytic reactor.

[0032] 2. Add 100 ml tetracycline hydrochloride solution (50 mg / L).

[0033] 3. Before light exposure, the mixture was magnetically stirred for 1 h in the dark in the dark to allow the system to reach adsorption / desorption equilibrium, and samples were taken and centrifuged.

[0034] 4. Then irradiate with simulated sunlight (xenon lamp) as the excitation light source of the photocatalyst, sample every 20 min and centrifuge.

[0035] The obtained supernatant is measured absorbance (wherein the maximum absorption peak wavelength of the tetracycline hydrochloride solution is 364 nm) with a UV spectrophotometer, and the degradation situation compar...

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Abstract

The invention discloses a method for preparing simply regulated and controlled different-crystal-form bismuth-titanium composite oxide photocatalysts and application of the method. The method comprises the following steps: electrospinning prepared a polyvinylpyrrolidone / bismuth chloride / titanium tetrabutoxide precursor solution into polyvinylpyrrolidone / bismuth chloride / titanium tetrabutoxide composite nanofibers by using a prepared electrostatic spinning solution through an electrostatic spinning device under the effect of high-voltage static electricity; and then calcining the composite nanofibers at different temperatures to generate different-crystal-form bismuth-titanium composite oxides. Crystal forms of the oxides can be regulated and controlled by controlling the calcination temperature of the prepared polyvinylpyrrolidone / bismuth chloride / titanium tetrabutoxide composite nanofibers, and the composite oxides obtained by calcination can effectively degrade a tetracycline hydrochloride solution under simulated sunlight.

Description

technical field [0001] The invention relates to a preparation method and application of a bismuth-titanium composite oxide photocatalyst for antibiotic organic wastewater treatment. Background technique [0002] Since 1943, penicillin was used clinically, and antibiotics developed rapidly. Nowadays, a large number of antibiotics are used in actual production and life, which leads to the abuse of antibiotics, and there are antibiotic residues in groundwater, surface water and soil. Although the residual concentration is not high, the long-term presence of antibiotics may lead to the transmission and spread of drug-resistant bacteria and antibiotic resistance genes, which can seriously affect the ecosystem. At present, the environmental pollution and toxicological effects of antibiotics have become one of the environmental problems facing the world. Tetracycline hydrochloride is a broad-spectrum antibiotic. Compared with other antibiotics, tetracycline hydrochloride can exis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18C02F1/30
CPCY02W10/37B01J23/18B01J35/004B01J37/082B01J37/342C02F1/30C02F2305/10
Inventor 许玉羡罗永晋刘欣萍陈庆华钱庆荣
Owner FUJIAN NORMAL UNIV
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