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Positively-symmetric double-Z-type sonocatalyst SnO2-CdSe-Bi2O3 and preparation method and application thereof

A catalyst and system technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as low transparency and photocatalysis, achieve stable properties, widen the response range, and inhibit separation.

Active Publication Date: 2018-09-25
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, photocatalysis is powerless for high concentrations, low transparency or opaque organic pollutants

Method used

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  • Positively-symmetric double-Z-type sonocatalyst SnO2-CdSe-Bi2O3 and preparation method and application thereof
  • Positively-symmetric double-Z-type sonocatalyst SnO2-CdSe-Bi2O3 and preparation method and application thereof
  • Positively-symmetric double-Z-type sonocatalyst SnO2-CdSe-Bi2O3 and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Positive Symmetrical Double Z Type System Acoustic Catalyst SnO 2 –CdSe–Bi 2 o 3

[0037] (1) Preparation method

[0038] 1. Preparation of SnO 2 powder

[0039] 3mmol SnCl 4 ·5H 2 O was dissolved in a mixed solution of 45ml absolute ethanol and 5ml distilled water (volume ratio=9:1). Then put it into an autoclave and seal it, and heat it in an electric oven at 180°C for 12h. After the autoclave was naturally cooled to room temperature, it was centrifuged, and the obtained precipitate was washed several times with absolute ethanol and deionized water, dried at 60°C for 6 hours, and fully ground to obtain SnO 2 Powder, spare.

[0040] 2. Preparation of CdSe powder

[0041] 4g anhydrous sodium sulfite (Na 2 SO 3 ) and 0.2 g of selenium powder (Se) with 20 mL of distilled water were vigorously stirred at a constant temperature of 70 °C to form Na 2 SeSO 3 solution. In another reaction vessel, 2 mL of ammonium hydroxide solution (NH 4 OH) was added...

Embodiment 2

[0058] Example 2 Positive Symmetric Double Z Type System Acoustic Catalyst SnO 2 –CdSe–Bi 2 o 3 Application in Degradation of Organic Dyes Solution (1) Acoustic Catalyst SnO in Different Time Periods 2 –CdSe–Bi 2 o 3 The UV absorption spectrum of degraded rhodamine B and the change of degradation rate calculated based on UV-visible (UV-vis) and total organic carbon (TOC).

[0059] Experimental method: 0.2g SnO 2 –CdSe–Bi 2 o 3 And 200mL of 10.0mg / L rhodamine B aqueous solution. At a temperature of 25–28°C, 300W, 40KHz ultrasonic irradiation was used for 150min with an interval of 30min.

[0060] Since rhodamine B has double bonds and conjugated double bonds, the π→π* electronic transitions can be excited at matching wavelengths. In addition, there are some heteroatom double bonds containing lone pairs of electrons, and n→π* electron transitions will also occur. From Figure 5a It can be seen that there are absorption peaks at 553nm, 258nm and 352nm wavelengths. Amo...

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PUM

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Abstract

The invention relates to a positively symmetric double-Z type a sonocatalyst SnO2-CdSe-Bi2O3 and a preparation method and application thereof. The sonocatalyst is prepared by adding SnO2, Bi2O3 and CdSe powder into distilled water, adjusting the pH of the obtained solution to be 5, performing ultrasonic dispersion for 10 min, then performing magnetic stirring for 4-6 h, washing an obtained productwith distilled water, performing centrifugation, drying at 80 DEG C, finally performing calcination at 450 DEG C for 2 h, and grinding a product to obtain the sonocatalyst. The sonocatalyst can effectively suppress recombination of photogenerated electrons and holes, broaden the response range of light, and provide more holes for sonocatalytic degradation. The synthesized sonocatalyst has high sonocatalytic activity when being applied for ultrasonic degradation of organic dye wastewater.

Description

technical field [0001] The invention belongs to the field of ultrasonic catalytic degradation, in particular to a catalyst with a positive symmetrical double Z-type system and its application in ultrasonic degradation of organic dyes. Background technique [0002] With the rapid development of social economy, a large amount of industrial and agricultural wastewater containing organic pollutants has entered the water body. Due to the characteristics of high toxicity, refractory degradation and easy accumulation, these pollutants pose a serious threat to the ecosystem and human health. The harm of organic pollutants in water has aroused widespread concern worldwide. Many studies have shown that for complex organic pollutants, traditional and single biological, chemical and physical methods are difficult to remove, or the removal efficiency is low. Photocatalysis has been widely used in the degradation of organic pollutants due to its advantages of strong mineralization, clea...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J35/00C02F1/30C02F1/36C02F101/30
CPCC02F1/30C02F1/36B01J27/0573C02F2101/308C02F2305/10B01J35/39
Inventor 王君李思怡张朝红张萌王国伟乔静张洪波
Owner LIAONING UNIVERSITY
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