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Preparation and decomposition of hydrogen sulfide semiconductor photocatalyst

Author: WuDan
Tutor: BaiXueFeng
School: Heilongjiang University
Course: Chemical processes
Keywords: Photocatalytic Hydrogen sulfide decomposition Hydrogen Production Composite photocatalyst
CLC: O643.36
Type: Master's thesis
Year: 2007
Downloads: 145
Quote: 0
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Abstract


This article was prepared ZnO / ZnS composite photocatalyst and series CdxZn1-xS solid solution state composite photocatalyst by XRD , UV- Vis diffuse reflectance spectroscopy , TPR , TG , SEM-EDS , SPS and other analytical tools , crystal photocatalyst the structure , photophysical properties were characterized , and investigated the catalytic decomposition of hydrogen sulfide Hydrogen . Prepared by precipitation ZnO / ZnS composite photocatalyst for the cubic crystal ZnS particles with hexagonal ZnO particles made ??of composite , based on the coupling of two semiconductor , this structure can effectively suppress the photo-generated electron - hole recombination and increase the spectral absorption range, photocatalytic hydrogen production efficiency is significantly improved compared with the single component of ZnS and ZnO . Prepared by coprecipitation series CdxZn1-xS solid solution state composite photocatalyst for the hexagonal structure . With CdxZn1-xS , x value is increased in the range of 0.1 to 0.9 , the band gap between 2.54 ~ 3.52eV was continuously decreased , reached the control of the semiconductor level structure . Photocatalytic decomposition of hydrogen sulfide, hydrogen production experiments showed that at 650 ° C , of roasting the Cd0.7Zn0.3S N2 atmosphere highest hydrogen production rate of up to 7.61 mmol / g · h . It also investigated the impact of the above prepared Cd0.7Zn0.3S catalytic hydrogen production rate of the amount of catalyst , the reaction solution concentration , irradiation flux . The results showed that the highest hydrogen production rate of up to 11.1 mmol / g · h , when the reaction solution to H2S saturated 2.0 mol / L NaOH solution . The best catalyst amount of 0.20 g . By fitting the experimental results , the hydrogen production rate with irradiation flux near rαΦ12 relationship .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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