ADSORPTION PROPERTIES OF TIO2 RELATED TO THE PHOTOCATALYTIC DEGRADATION OF ORGANIC CONTAMINANTS IN WATER

被引:84
作者
CHEN, HY [1 ]
ZAHRAA, O [1 ]
BOUCHY, M [1 ]
THOMAS, F [1 ]
BOTTERO, JY [1 ]
机构
[1] CNRS,ENVIRONNEMENT & MINERAL LAB,UA 235,F-54501 VANDOEUVRE NANCY,FRANCE
关键词
ADSORPTION; PHOTOCATALYTIC DEGRADATION; ORGANIC CONTAMINANTS;
D O I
10.1016/1010-6030(94)03900-F
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The purpose of this study was to correlate the photocatalytic degradation of water contaminants with the adsorption phenomena, taking both the equilibrium state and kinetics into consideration. 1,2-Dichloroethane (DCE) was chosen as a test pollutant. The adsorption isotherm was found to follow the Langmuir model. The kinetics of adsorption were studied and interpreted as a mass transfer process. The kinetics of photocatalytic degradation were analysed with special attention given to the influence of the reactant concentration. A kinetic model is proposed, which includes mass transfer, leading to an apparent Langmuir-Hinshelwood equation for the degradation rate, even when the kinetics are controlled by mass transfer. The experimental results show an agreement with the model at concentrations above 0.5 mmol.l(-1), but at lower concentrations the rate is lower than expected, possibly due to a loss of DCE or hydroxyl radicals.
引用
收藏
页码:179 / 186
页数:8
相关论文
共 33 条
[1]   SEMICONDUCTOR-SENSITIZED PHOTODEGRADATION OF 4-CHLOROPHENOL IN WATER [J].
ALSAYYED, G ;
DOLIVEIRA, JC ;
PICHAT, P .
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 1991, 58 (01) :99-114
[2]  
BAHNEMANN D, 1991, DECHEMA MONOGR, V124, P261
[3]   FEASIBILITY STUDY OF AQUEOUS ADSORPTION OF CR(VI) ON TITANIUM-DIOXIDE [J].
BHUTANI, MM ;
KUMARI, R ;
MITRA, AK .
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES, 1992, 159 (02) :343-351
[4]   KINETIC AND MECHANISTIC OVERVIEW OF TIO2-PHOTOCATALYZED OXIDATION REACTIONS IN AQUEOUS-SOLUTION [J].
BLAKE, DM ;
WEBB, J ;
TURCHI, C ;
MAGRINI, K .
SOLAR ENERGY MATERIALS, 1991, 24 (1-4) :584-593
[5]   ADSORPTION CHARACTERISTICS OF POLYACETIC AMINO-ACIDS ONTO HYDROUS GAMMA-AL2O3 [J].
BOWERS, AR ;
HUANG, CP .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1985, 105 (01) :197-215
[6]   METHYL-ORANGE AS A PROBE FOR PHOTOOXIDATION REACTIONS OF COLLOIDAL TIO2 [J].
BROWN, GT ;
DARWENT, JR .
JOURNAL OF PHYSICAL CHEMISTRY, 1984, 88 (21) :4955-4959
[7]   A STUDY OF THE PRIMARY STEP IN THE PHOTOCHEMICAL DEGRADATION OF ACETIC-ACID AND CHLOROACETIC ACIDS ON A TIO2 PHOTOCATALYST [J].
CHEMSEDDINE, A ;
BOEHM, HP .
JOURNAL OF MOLECULAR CATALYSIS, 1990, 60 (03) :295-311
[8]   PHOTOASSISTED HETEROGENEOUS CATALYSIS - RATE-EQUATIONS FOR OXIDATION OF 2-METHYL-2-BUTYL-ALCOHOL AND ISOBUTANE [J].
CHILDS, LP ;
OLLIS, DF .
JOURNAL OF CATALYSIS, 1981, 67 (01) :35-48
[9]   SENSITIZED PHOTO-OXIDATIONS OF DISSOLVED ALCOHOLS IN HOMOGENEOUS AND HETEROGENEOUS SYSTEMS .2. TIO2-SENSITIZED PHOTODEHYDROGENATIONS OF BENZYL ALCOHOL [J].
CUNNINGHAM, J ;
SRIJARANAI, S .
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, 1991, 58 (03) :361-371
[10]   FACTORS INFLUENCING EFFICIENCIES OF TIO2-SENSITIZED PHOTODEGRADATION .1. SUBSTITUTED BENZOIC-ACIDS - DISCREPANCIES WITH DARK-ADSORPTION PARAMETERS [J].
CUNNINGHAM, J ;
ALSAYYED, G .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1990, 86 (23) :3935-3941