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Photocatalyst for efficiently degrading organic dye in water and preparation method of photocatalyst

A technology of organic dyes and photocatalysts, which is applied in chemical instruments and methods, physical/chemical process catalysts, water pollutants, etc. Low problems, to achieve the effect of broadening the light absorption range, improving the photocatalytic activity, and high photocatalytic efficiency

Active Publication Date: 2019-07-09
北京东雷恒业环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of photocatalytic technology is still limited by the development of new and efficient photocatalysts
There are still two key problems in the current semiconductor photocatalysts: one is that the photoresponse wavelength range of most photocatalysts is mainly in the ultraviolet region, and the utilization rate of sunlight is low; the other is that the recombination rate of photogenerated carriers is very high, resulting in Photocatalytic quantum efficiency is low
The key reason for these problems is that a single semiconductor photocatalytic material system has been unable to break through performance limitations and meet application requirements.

Method used

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  • Photocatalyst for efficiently degrading organic dye in water and preparation method of photocatalyst
  • Photocatalyst for efficiently degrading organic dye in water and preparation method of photocatalyst
  • Photocatalyst for efficiently degrading organic dye in water and preparation method of photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: WO 3 Preparation of nanofibers

[0030] Dissolve 1 mmol of sodium metatungstate in 8 ml of DMF, stir for half an hour, add 1.0 g of polyvinylpyrrolidone (PVP, K88-96), and stir overnight to obtain a spinning solution. Transfer the spinning solution to a syringe with a spinneret, the distance between the spinneret and the receiving plate is 20±1cm, the applied voltage is 20kV, the room temperature is controlled at 20±2°C, and the humidity is below 30%. The spinning process obtains precursor nanofibers. Finally, the precursor nanofibers were calcined in the air at 500°C for 1 hour, and the heating rate was set at 2°C / min; naturally cooled to room temperature, the WO 3 Nanofibers.

Embodiment 2

[0031] Embodiment 2: the preparation of BiOCl nanosheet

[0032] Weigh 1 mmol of BiCl 3 and 0.25g of CTAB were dissolved in 10mL of ethylene glycol, and then the above two solutions were mixed uniformly and transferred to a 50mL polytetrafluoroethylene reactor, heated to 120°C and kept at a constant temperature for 8h, then naturally cooled to room temperature, and the product The precipitate was collected, washed, and dried to obtain BiOCl nanosheets.

Embodiment 3

[0033] Example 3: WO 3 Preparation of / BiOCl Composite Photocatalyst

[0034] Weigh 1mmol of prepared WO 3 The nanofibers were ultrasonically dispersed in 20mL of ethylene glycol to form a suspension to obtain suspension A; at the same time, weigh 0.5mmol of BiCl 3 Dissolve in 10ml ethylene glycol to obtain solution B; and weigh 0.2g of cetyltrimethylammonium bromide (CTAB) and dissolve it in 10mL ethylene glycol to obtain solution C; then, mix the above solution B and Solution C was added to suspension A, stirred evenly, transferred to a hydrothermal reaction kettle, kept at a constant temperature of 120°C for 8 hours, cooled to room temperature naturally, and the formed precipitate was collected, washed and dried to obtain WO 3 / BiOCl composite photocatalyst, the sample is marked as WO 3 / BiOCl(0.5).

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Abstract

The invention relates to the technical field of nano photocatalysts, in particular to a photocatalyst for efficiently degrading organic dyes in water and a preparation method of the photocatalyst. Thecatalyst is formed by uniformly loading bismuth oxychloride nanosheets onto tungsten oxide nanofibers, wherein the thickness of the BiOCl nanosheets is 10-15 nm, and the diameter of the WO3 nanofibers is from 200 to 300 nm. The WO3 / BiOCl composite photocatalyst of the invention has a broad light absorption range, effectively suppresses photo-generated electron-hole pair recombination, also greatly improves the surface catalytic activity, can rapidly degrade organic dye in water under the illumination of sunlight, and is easy to recycle and reuse.

Description

technical field [0001] The invention relates to the technical field of nano photocatalysts, in particular to a photocatalyst for efficiently degrading organic dyes in water and a preparation method thereof. Background technique [0002] With the rapid development of modern industry, environmental pollution is becoming more and more serious, especially the pollution of water resources is more serious. China is the world's largest textile producer. The wastewater discharge and total pollutants of my country's printing and dyeing industry rank second and fourth in the national industrial sector respectively, and it is one of the key polluting industries in my country. Dye wastewater has the characteristics of high organic matter content, complex structure, and low biodegradability, and most of them are potentially toxic and harmful to human health. Therefore, it is of great significance to develop advanced treatment methods for printing and dyeing wastewater and further reduce...

Claims

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Application Information

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IPC IPC(8): B01J27/132B01J35/02C02F1/30C02F101/30
CPCB01J27/132C02F1/30C02F2101/308B01J35/40B01J35/39
Inventor 李本侠何泽清肖依陶雪钦汪任山田青华
Owner 北京东雷恒业环保科技有限公司
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