Preparation and application of dendriform TiO2-coating CdS hollow double-shell material

A technology of titanium dioxide and cadmium sulfide, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of unstable catalyst performance and insufficient catalyst efficiency, so as to enhance photocatalytic performance and improve photocatalytic performance. Catalytic efficiency, effect of increasing specific surface area

Active Publication Date: 2014-07-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of insufficient catalyst efficiency and unstable catalyst performance in the prior art, the present invention provides the preparation and application of a dendritic titanium dioxide-coated cadmium sulfide hollow double-shell material, which is effective against various organic pollutants in water, especially for rhodan Ming B simulated printing and dyeing wastewater has an excellent treatment effect, and the degradation ability of the degradable material is still good after repeated use, which is environmentally friendly and economical

Method used

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  • Preparation and application of dendriform TiO2-coating CdS hollow double-shell material
  • Preparation and application of dendriform TiO2-coating CdS hollow double-shell material
  • Preparation and application of dendriform TiO2-coating CdS hollow double-shell material

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Experimental program
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Effect test

Embodiment 1

[0047] The preparation method of dendritic titanium dioxide coated cadmium sulfide hollow double-shell material is as follows:

[0048] (1) Polystyrene template (PS) was prepared, and a 500mL round-bottomed flask was heated in a 70°C water bath. Add deionized water 200mL, sodium bicarbonate (NaHCO 3 ) 0.0412g, sodium p-styrene sulfonate (SSS) 0.0412g and styrene (St) 19.59g. Nitrogen gas was introduced to remove the air in the reactor, and 0.288 g of potassium persulfate (KPS) was added, and the stirring rate was 200 r / min. After reacting for 15 hours, the reaction product was collected by cooling.

[0049] (2) Preparation of cadmium sulfide-coated polystyrene core-shell material. Take 1.2 mL of the prepared PS emulsion and dissolve it in 20 mL of ethanol, take it out after ultrasonication for 10 min, and add 0.2 g of polyvinylpyrrolidone PVP. Get 2.66g cadmium acetate (Cd(Ac) 2 2H 2 O) and 1.06 g of thioacetamide (TAA) were dissolved in 100 mL of deionized water and added...

Embodiment 2

[0056] The dendritic titania coated cadmium sulfide hollow double-shell material (dendritic CdSTiO 2 HDNPs) and dendritic titania-coated cadmium sulfide-coated polystyrene core-shell-shell materials (PSCdSTiO 2 ), cadmium sulfide-coated polystyrene core-shell material (PSCdS) and titanium dioxide-coated polystyrene core-shell material (PSTiO 2) to conduct 5mg / LRhB simulated printing and dyeing wastewater degradation experiments, using a 500W xenon lamp as a visible light source, fixed in a cylindrical glass reactor, cooled with circulating water and kept at 20-30°C. Use a cut-off filter to ensure that it is fully illuminated by visible light sources (>450nm). The average intensity of irradiation measured by a digital illuminance meter is 6.5×10 4 lux. Add 0.2 g of the prepared catalyst to 200 mL of 5 mg / L Sudan Red B (RhB) solution, and stir for 30 min in a dark place before light exposure to ensure that the adsorption-degradation equilibrium is reached. Start to illuminat...

Embodiment 3

[0059] The dendritic titania-coated cadmium sulfide hollow double-shell material prepared in the present invention was subjected to degradation experiments at different RhB concentrations of 5-15 mg / L. The specific steps were the same as in Example 2, and 5, 10, and 15 mg / L RhB simulated printing and dyeing wastewater were respectively configured for experimentation. The experimental results take C as the instant RhB concentration, Co as the initial RhB concentration, and C / C o Indicates the degree of degradation, and the experimental results are drawn as Image 6 shown.

[0060] It can be seen from the figure that the prepared dendritic titania-coated cadmium sulfide hollow double-shell material has treatment effects in the case of different concentrations of pollutants, and has better catalytic performance in the case of low concentration (5mg / L). This coincides with the fact that the photocatalytic method is suitable for treating low-concentration wastewater, and at the s...

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Abstract

The invention discloses preparation and application of a dendriform TiO2-coating CdS hollow double-shell material. The preparation comprises the following steps: preparing a CdS-coating polystyrene core-shell material (PS@CdS) by adopting an ultrasonic wave assistance method, introducing CTAC, coating a TiO2 shell through a wet chemistry method to prepare the dendriform outer morphology (dendriform PS@CdS@TiO2), and sintering to remove polystyrene to obtain the target material, namely the dendriform hollow CdS@TiO2, wherein the dendriform hollow CdS@TiO2 has efficient light degradation performance for organic wastewater, especially RhB printing and dyeing wastewater under condition with visible light. The preparation conditions are mild, the method is novel, the operation process is simple, the treatment is rapid, the hollow double-shell material has good stability, photocorrosion generated by CdS is effectively avoided, the degradation capability during the recycling process is basically kept stable, the preparation and the application are economical and environmentally friendly, and the hollow double-shell material can be widely applied to degradation and recycling of other organic wastewater, especially deep degradation of organic wastewater with low concentration.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst, in particular to the preparation and application of a dendritic titania-coated cadmium sulfide hollow double-shell material. Background technique [0002] Nano-photocatalysis technology is a nano-bionic technology, which is used in many cutting-edge fields such as environmental purification, self-cleaning materials, advanced new energy, cancer medical treatment, and high-efficiency antibacterial. There are many materials that can be used as photocatalysts in the world, including titanium dioxide (TiO 2 ), zinc oxide (ZnO), tin oxide (SnO 2 ), zirconium dioxide (ZrO 2 ), cadmium sulfide (CdS) and other oxide sulfide semiconductors. Among them, titanium dioxide (TiO 2 ) has become the most deeply researched nano-photocatalytic material in the world because of its strong oxidation ability, stable and non-toxic chemical properties, but it can only absorb ultraviolet light. When it is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J35/02C02F1/30
Inventor 郑经堂孙冠华江波朱超胜袁建军薛庆忠尹华承吴明铂闫子峰仇实郑景伟杨柳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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