Application of solar energy in wastewater treatment: Photocatalytic degradation of α-methylstyrene in water in presence of ZnO

被引:13
作者
Rajeev, B. [1 ]
Yesodharan, Suguna [1 ]
Yesodharan, E. P. [1 ]
机构
[1] Cochin Univ Sci & Technol, Sch Environm Studies, Kochi 682022, Kerala, India
关键词
Zinc oxide; Photocatalysis; alpha-Methylstyrene; Hydrogen peroxide; Solar energy; ORGANIC CONTAMINANTS; HYDROGEN-PEROXIDE; TIO2; OXIDATION; LIGHT; DYES; MINERALIZATION; DECOMPOSITION;
D O I
10.1016/j.jwpe.2015.09.005
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Zinc oxide mediated photocatalytic degradation of trace amounts of the petrochemical pollutant alpha-methylstyrene (AMS) in water is investigated using sunlight as the energy source. The influence of various parameters such as catalyst dosage, initial concentration of AMS, pH, insitu formed intermediates, humic acid, H2O2,O-2 etc., on the rate of degradation is investigated. Acetophenone (ACP) is identified as the major intermediate in the degradation. Both AMS and ACP inhibit the degradation of one another, the extent of inhibition being dependent on the relative concentration of one with respect to the other. H2O2 formed in the process acts as a reservoir of various Reactive Oxygen Species (ROS) which can enhance the degradation. However, H2O2 also acts as a scavenger for the ROS leading to its own concurrent decomposition. The degradation of AMS follows first order kinetics. The degradation is slow in deaerated system thereby reconfirming the role of O-2 in the photocatalytic process. The catalyst can be recycled at least three times repeatedly before there is reduction in activity. The study clearly shows that zinc oxide mediated solar photocatalysis can be used as an effective tool for the tertiary treatment of AMS contaminated water thus indicating its potential for achieving the twin objectives of solar energy harvesting and wastewater treatment. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:108 / 118
页数:11
相关论文
共 46 条
[1]   Photocatalytic activity of ZnO impregnated Hβ and mechanical mix of ZnO/Hβ in the degradation of monocrotophos in aqueous solution [J].
Anandan, S. ;
Vinu, A. ;
Venkatachalam, N. ;
Arabindoo, B. ;
Murugesan, V. .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2006, 256 (1-2) :312-320
[2]   Zinc oxide mediated sonophotocatalytic degradation of phenol in water [J].
Anju, S. G. ;
Yesodharan, Suguna ;
Yesodharan, E. P. .
CHEMICAL ENGINEERING JOURNAL, 2012, 189 :84-93
[3]   ZEOLITE EFFECT ON THE OXIDATION OF HYDROCARBONS WITH IRRADIATED TIO2 SEMICONDUCTOR [J].
BEAUNE, O ;
FINIELS, A ;
GENESTE, P ;
GRAFFIN, P ;
OLIVE, JL ;
SAAEDAN, A .
JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS, 1992, (22) :1649-1650
[4]   UV-induced photocatalytic degradation of azo dyes by organic-capped ZnO nanocrystals immobilized onto substrates [J].
Comparelli, R ;
Fanizza, E ;
Curri, ML ;
Cozzoli, PD ;
Mascolo, G ;
Agostiano, A .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2005, 60 (1-2) :1-11
[5]   Photocatalytic degradation of pesticide contaminants in water [J].
Devipriya, S ;
Yesodharan, S .
SOLAR ENERGY MATERIALS AND SOLAR CELLS, 2005, 86 (03) :309-348
[6]   Effect of hydrogen peroxide on the destruction of organic contaminants-synergism and inhibition in a continuous-mode photocatalytic reactor [J].
Dionysiou, DD ;
Suidan, MT ;
Baudin, I ;
Laîné, JM .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2004, 50 (04) :259-269
[7]   Semiconductor-sensitized photodegradation of dichlorvos in water using TiO2 and ZnO as catalysts [J].
Evgenidou, E ;
Fytianos, K ;
Poulios, I .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2005, 59 (1-2) :81-89
[8]   Heterogeneous photocatalytic degradation of organic contaminants over titanium dioxide: A review of fundamentals, progress and problems [J].
Gaya, Umar Ibrahim ;
Abdullah, Abdul Halim .
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS, 2008, 9 (01) :1-12
[9]   PHOTOGENERATION OF HYDROGEN-PEROXIDE IN AQUEOUS TIO2 DISPERSIONS [J].
HARBOUR, JR ;
TROMP, J ;
HAIR, ML .
CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE, 1985, 63 (01) :204-208
[10]   An approach to estimating photocatalytic activity of TiO2 suspension by monitoring dissolved oxygen and superoxide ion on decomposing organic compounds [J].
Hirakawa, Tsutomu ;
Daimon, Toshihiro ;
Kitazawa, Masahiro ;
Ohguri, Nobuaki ;
Koga, Chifumi ;
Negishi, Nobuaki ;
Matsuzawa, Sadao ;
Nosaka, Yoshio .
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 2007, 190 (01) :58-68