Solar TiO2-assisted photocatalytic degradation of IGCC power station effluents using a Fresnel lens

被引：15

作者：

Monteagudo, J. M. ^{[1
]}

Duran, A. ^{[1
]}

Guerra, J. ^{[1
]}

Garcia-Pena, F. ^{[2
]}

Coca, P. ^{[2
]}

机构：

[1] Univ Castilla La Mancha, Dept Chem Engn, Escuela Tecn Super Ingn Ind, E-13071 Ciudad Real, Spain

[2] Elcogas SA, CT GICC Puertollano, Ciudad Real 13500, Spain

来源：

CHEMOSPHERE | 2008年 / 71卷 / 01期

关键词：

cyanide; formate; photocatalysis; solar UV radiation; titanium dioxide;

D O I：

10.1016/j.chemosphere.2007.10.067

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The heterogeneous TiO2 assisted photocatalytic degradation of wastewater from a thermoelectric power station under concentrated solar light irradiation using a Fresnel lens has been studied. The efficiency of photocatalytic degradation was determined from the analysis of cyanide and formate removal. Firstly, the influence of the initial concentration of H2O2 and TiO2 on the degradation kinetics of cyanides and formates was studied based on a factorial experimental design. Experimental kinetic constants were fitted using neural networks. Results showed that the photocatalytic process was effective for cyanides destruction (mainly following a molecular mechanism), whereas most of formates (degraded mainly via a radical path) remained unaffected. Finally, to improve formates degradation, the effect of lowering pH on their degradation rate was evaluated after complete cyanide destruction. The photooxidation efficiency of formates reaches a maximum at pH around 5-6. Above pH 6, formate anion is subjected to electrostatic repulsion with the negative surface of TiO2. At pH < 4.5, formate adsorption and photon absorption are reduced due to some catalyst agglomeration. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：161 / 167

页数：7

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