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Composite photocatalyst nano SnO_2/ZnO Preparation, Characterization and Photocatalytic Activity

Author: ShenLiChun
Tutor: ZhouBingMing；CaoJianXin
School: Guizhou University
Course: Chemical Engineering and Technology
Keywords: Coprecipitation Composite photocatalyst Zinc oxide Tin oxide
CLC: TQ426
Type: Master's thesis
Year: 2008
Downloads: 252
Quote: 2
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Abstract


In recent years, semiconductor photocatalytic degradation of technology as a new type of environmental purification technology has been more and more importance for the people . ZnO is an important semiconductor material, the material bulk band gap of 3.2eV, corresponding to the wavelength of 387nm UV light . However, the pure ZnO photocatalytic efficiency is low, difficult engineering applications . Semiconductor composite or doping can improve the photocatalytic efficiency , thus causing widespread concern. This article was prepared by co-precipitation of nano SnO 2 / ZnO composite photocatalyst . By thermal analyzer composite photocatalyst precursor thermal reaction behavior , X-ray diffraction analysis of the calcined composite photocatalyst phase composition and morphology was observed by transmission electron microscopy and particle size distribution : In the high-pressure mercury lamp , using its degradation methyl orange, formaldehyde solution , and its photocatalytic activity for analysis. The experimental results showed that: ( 1 ) to ZnSO 4 · 7H 2 O and SnCl 4 · 5H 2 O is raw materials, ammonia as precipitating agent , prepared by co-precipitation of nano- SnO 2 / ZnO composite photocatalyst , the best n (Zn) / n (Sn) ratio of 2:1 , the optimum calcination temperature of 600 ℃ insulation 6h. Nano- SnO 2 / ZnO as a photocatalyst , compared with only ZnO nanoparticles under the same conditions the degradation rate of methyl orange increased significantly . Composite catalyst dosage of 2.5g / L, after 20min illumination , the degradation rate of methyl orange reached 100% . Photodegradation reaction of methyl orange line with a kinetic equation , and the repeated use of good performance . ( 2 ) According to the experiments to determine the optimal preparation conditions , the precursor by different calcination temperatures, different holding time composite photocatalyst prepared formaldehyde, methyl phenol and wine wastewater photodegradation . Experimental results show that : 600 ℃ calcined 6h best composite catalyst . Composite catalysts for formaldehyde photocatalytic degradation of methyl orange is similar to the reaction are in line with a kinetic equation , but more difficult to degrade formaldehyde ; pairs of methyl phenol photodegradation zero order kinetics equation . Composite catalysts for brewery wastewater COD removal , to achieve good results .

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst )
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