Photooxidation of azo dye in aqueous dispersions of H2O2/α-FeOOH

被引：176
作者：
He, J
Ma, WH
He, JJ
Zhao, JC [1 ]
Yu, JC
机构：
[1] Chinese Acad Sci, Inst Chem, Lab Photochem, Ctr Mol Sci, Beijing 100080, Peoples R China
[2] Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2002年 / 39卷 / 03期
基金：
中国国家自然科学基金;
关键词：
goethite; hydrogen peroxide; photooxidation; azo dye;
D O I：
10.1016/S0926-3373(02)00085-1
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 photodegradation of an azo dye, Mordant Yellow 10 (MY 10), in aqueous dispersions of goethite (alpha-FeOOH)/H2O2 at neutral pHs under UV irradiation was studied in comparison with the dark reaction. It was found that UV irradiation could significantly accelerate the degradation of MY10. This provides an alternative approach to the treatment of non-biodegradable azo dye pollutants. The degradation process were investigated by infrared (IR), H-1 NMR, total organic carbon (TOC) and gas chromatography-mass spectroscopy (GC-MS) analysis. Evidence for enhancement of (OH)-O-. radical generation by UV irradiation was obtained using 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) spin-trapping EPR spectroscopy. A possible degradation mechanism of MY10 by alpha-FeOOH/H2O2 under UV irradiation was proposed, which involves the photolysis of the surface complex of H2O2 with the oxide surface metal centers to produce (OH)-O-. radicals, leading to the decomposition of organic compounds. (C) 2002 Published by Elsevier Science B.V.
引用
收藏
页码：211 / 220
页数：10
相关论文
共 34 条
[1]  
ALLEN RLM, 1971, COLOR CHEM STUDIES M, pCH4
[2]   Atrazine degradation in irradiated iron oxalate systems: Effects of pH and oxalate [J].
Balmer, ME ;
Sulzberger, B .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1999, 33 (14) :2418-2424
[3]   New evidence against hydroxyl radicals as reactive intermediates in the thermal and photochemically enhanced fenton reactions [J].
Bossmann, SH ;
Oliveros, E ;
Göb, S ;
Siegwart, S ;
Dahlen, EP ;
Payawan, L ;
Straub, M ;
Wörner, M ;
Braun, AM .
JOURNAL OF PHYSICAL CHEMISTRY A, 1998, 102 (28) :5542-5550
[4]   Application of a supported iron oxyhydroxide catalyst in oxidation of benzoic acid by hydrogen peroxide [J].
Chou, SS ;
Huang, CP .
CHEMOSPHERE, 1999, 38 (12) :2719-2731
[5]   A HIGH-VALENT NONHEME IRON INTERMEDIATE - STRUCTURE AND PROPERTIES OF [FE-2(MU-O)(2)(5-ME-TPA)(2)](CLO4)(3) [J].
DONG, YH ;
FUJII, H ;
HENDRICH, MP ;
LEISING, RA ;
PAN, GF ;
RANDALL, CR ;
WILKINSON, EC ;
ZANG, Y ;
QUE, L ;
FOX, BG ;
KAUFFMANN, K ;
MUNCK, E .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1995, 117 (10) :2778-2792
[6]   Evidence for Fenton photoassisted processes mediated by encapsulated Fe ions at biocompatible pH values [J].
Fernandez, J ;
Dhananjeyan, MR ;
Kiwi, J ;
Senuma, Y ;
Hilborn, J .
JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (22) :5298-5301
[7]  
FLYNN CM, 1984, CHEM REV, V31, P84
[8]   Heterogeneous photo-fenton degradation of an azo dye in aqueous H2O2/iron oxide dispersions at neutral pHs [J].
He, J ;
Tao, X ;
Ma, WH ;
Zhao, JC .
CHEMISTRY LETTERS, 2002, (01) :86-87
[9]  
HELZ GR, 1994, AQUATIC SURFACE PHOT, P3
[10]   ENVIRONMENTAL APPLICATIONS OF SEMICONDUCTOR PHOTOCATALYSIS [J].
HOFFMANN, MR ;
MARTIN, ST ;
CHOI, WY ;
BAHNEMANN, DW .
CHEMICAL REVIEWS, 1995, 95 (01) :69-96
1234