BiOI composite material and preparation method and application of BiOI composite material

A composite material and reaction technology, applied in chemical instruments and methods, light water/sewage treatment, energy wastewater treatment, etc., can solve the problems of low solar energy utilization rate, narrow spectral response range, low photon quantum efficiency, etc., to prevent toxic disinfection By-product generation, excellent stability, and high removal efficiency

Inactive Publication Date: 2012-08-15
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, there are two main problems in photocatalytic technology: first, the light quantum efficiency is low; second, the spectral response range is narrow, and the utilization rate of solar energy is low.
So far, the reports on BiOI and BiOI composite catalysts on microorganisms and algal toxins in drinking water have not involved

Method used

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  • BiOI composite material and preparation method and application of BiOI composite material
  • BiOI composite material and preparation method and application of BiOI composite material
  • BiOI composite material and preparation method and application of BiOI composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Preparation of BiOI

[0041] Dissolve 1.66g KI in 60 mL ethylene glycol, stir with a magnetic stirrer for 30min, then add 4.85g Bi(NO 3 ) 3 ·5H 2 O, continue stirring for 2.0 h to obtain a uniformly distributed yellow transparent liquid. Pour the transparent liquid obtained above into an autoclave, heat at 160 °C for 12, and cool to room temperature to obtain a yellow precipitate, centrifuge at 3000 rpm for 20 min, filter with a 0.22 μm water filter, and filter the product with ethanol and deionized water respectively Wash 5 times, and dry at 55°C to obtain BiOI.

Embodiment 2

[0042] Example 2 Ag / BiOI composite material removes Escherichia coli under visible light

[0043] The preparation method of the Ag / BiOI composite material is as follows: 1.0 g BiOI powder and 0.079 g AgNO 3 Add 40 mL of deionized water containing 10 mmol / L of HCOOH. The above mixed liquid was ultrasonicated for 30 min and then stirred to obtain a uniform BiOI and AgNO 3 Mixture. A 500 W high-pressure mercury lamp was used to irradiate the mixture for 30 min, and stirring was carried out during the irradiation process, so that Ag was evenly loaded on the surface of BiOI. After the above reaction, the Ag / BiOI composite catalyst (abbreviated as 5.0%Ag / BiOI) with Ag doping content (wt.%) of 5.0% was obtained by filtering through a 0.22 μm water filter membrane.

[0044] The photocatalytic treatment device used in the experiment is as follows: figure 1 As shown, the device includes a 400 W iodine-gallium lamp (irradiation wavelength greater than 420 nm, Shanghai Aojia Lightin...

Embodiment 3

[0048] Example 3 Pt / BiOI composite material removes Escherichia coli under visible light

[0049] The preparation method of Pt / BiOI composite material is as follows: 1.0 g BiOI powder was placed in 40 mL of 2.2 mmol / L chloroplatinic acid solution containing 10 mmol / L HCOOH. The above mixed liquid was ultrasonicated for 30 min and then stirred to obtain a uniform mixture of BiOI and chloroplatinic acid. A 500 W high-pressure mercury lamp was used to irradiate the mixture for 30 min, and stirring was carried out during the irradiation process, so that Pt was uniformly loaded on the surface of BiOI. After the above reaction was completed, a Pt / BiOI composite catalyst with a Pt doping content (wt.%) of 2.0% (abbreviated as 2.0% Pt / BiOI) was obtained by filtering through a 0.22 μm water filter membrane.

[0050] The photocatalytic treatment device used in the experiment is as follows: figure 1 As shown, the device was used to remove Escherichia coli. The treatment object is Es...

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Abstract

The invention discloses a BiOI composite material and a preparation method and an application of the BiOI composite material. The BiOI composite material is formed by doping noble metal materials, AgI or multi-walled carbon nanotubes in BiOI, wherein the noble metal materials comprises Pt and Ag. Catalysts refer to Pt/BiOI, Ag/BiOI, multi-walled carbon nanotubes (MWCNTs)/BiOI and AgI/BiOI Catalysts which are obtained by doping noble metal Pt, Ag or multi-walled carbon nanotubes and AgI on the basis of BiOI. The BiOI composite material is simple in preparation process, good in stability and narrow in energy band, can efficiently utilize solar energy and can be excited under visible light to generate substances with strong oxidizing property, such as hydroxyl free radical which can effectively remove microorganism, difficultly-biodegradable organic substances and microcystin from water.

Description

technical field [0001] The invention relates to a BiOI composite material and its preparation method and application. Background technique [0002] my country is a country that lacks fresh water resources. With the rapid development of economy and population growth, the demand for water continues to increase, and the contradiction between supply and demand of fresh water resources has intensified. At the same time, the discharge of urban sewage in my country is increasing year by year, and water pollution is serious. Therefore, water treatment is very important. Disinfection is an essential link in the process of drinking water treatment, which provides an important guarantee for the safety of water supply. Research at home and abroad shows that many health problems are closely related to the pollution of drinking water. In order to prevent the occurrence of infectious diseases and ensure human health, drinking water must be sterilized before drinking. From the perspecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/13B01J27/08C02F1/30
CPCY02W10/37
Inventor 何春朱林飞熊亚徐作成章嘉慧黄艳玲张琼杨婧羚
Owner SUN YAT SEN UNIV
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