KINETIC-STUDIES IN HETEROGENEOUS PHOTOCATALYSIS .4. THE PHOTOMINERALIZATION OF A HYDROQUINONE AND A CATECHOL

被引:41
作者
TERZIAN, R
SERPONE, N
MINERO, C
PELIZZETTI, E
HIDAKA, H
机构
[1] CONCORDIA UNIV,DEPT CHEM,MONTREAL H3G 1M8,QUEBEC,CANADA
[2] UNIV TURIN,DIPARTMENTO CHIM ANALIT,I-10125 TURIN,ITALY
[3] UNIV PARMA,DIPARTIMENTO CHIM FIS APPL,I-43100 PARMA,ITALY
[4] MEISEI UNIV,DEPT CHEM,HINO,TOKYO 191,JAPAN
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/1010-6030(90)80035-V
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 photocatalysed mineralization of methylhydroquinone (MHQ) and 4-methylcatechol (4-MCC) was examined in air-equilibrated, irradiated (UV-visible light) aqueous suspensions of TiO2 (Degussa P 25) at pH 3. The temporal course of the degradation was followed by high performance liquid chromatography and gas chromatography (for CO2 evolution), and also by diffuse reflectance spectroscopy for 4-MCC. Total disappearance of MHQ occurs in approximately 1 h via apparent first-order kinetics (k(app) almost-equal-to 0.041 +/- 0.003 min-1; t(1/2) = 17 min), followed by the concomitant stoichiometric evolution of CO2 which is complete after approximately 1 h of irradiation. 4-MCC is strongly adsorbed (approximately 53%) to the catalyst's surface, and its disappearance is complete within approximately 20 min of irradiation (confirmed by the diffuse reflectance spectra of the catalyst powder). Evolution of CO2 for 4-MCC occurs via first-order kinetics (k(app) almost-equal-to 0.025 +/- 0.005 min-1; t(1/2) = 28 min) and is complete after approximately 1.5 h of irradiation.
引用
收藏
页码:243 / 249
页数:7
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