Solar photocatalytic degradation of azo dye:: comparison of photocatalytic efficiency of ZnO and TiO2

被引:1441
作者
Sakthivel, S
Neppolian, B
Shankar, MV
Arabindoo, B
Palanichamy, M
Murugesan, V [1 ]
机构
[1] Anna Univ, Dept Chem, Madras 600025, Tamil Nadu, India
[2] Aussenstelle Hannover, Inst Solarenergieforsch Hameln Emmerthal, ISFH, D-30165 Hannover, Germany
关键词
photocatalysis; acid brown 14; ZnO; TiO2; degradation;
D O I
10.1016/S0927-0248(02)00255-6
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The photocatalytic activity of commercial ZnO powder has been investigated and compared with that of Degussa P25 TiO2. Laboratory experiments with acid brown 14 as the model pollutant have been carried out to evaluate the performance of both ZnO and TiO2 catalysts. Solar light was used as the energy source for the photocatalytic experiments, These catalysts were examined for surface area, particle size and crystallinity. The effect of initial dye concentration, catalyst loading, irradiation time, pH, adsorption of acid brown 14 on ZnO and TiO2 intensity of light and comparison of photocatalytic activity with different commercial catalysts were Studied. The progress of photocatalytic degradation of the acid brown 14 has been observed by monitoring the change in substrate concentration of the model compound employing HPLC and measuring the absorbance in UV-Visible spectrophotometer for decolourisation. The photodegradation rate was determined for each experiment and the highest values were observed for ZnO suggesting that it absorbs large fraction of the solar spectrum and absorption of more light quanta than TiO2 The complete mineralisation was confirmed by total organic carbon (TOC) analysis, COD measurement and estimation of the formation of inorganic ions such as NH4+, NO3, Cl- and SO42-. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:65 / 82
页数:18
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