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Photodegradation of propranolol by Fe(III)-citrate complexes: Kinetics, mechanism and effect of environmental media
被引:82
作者:
Chen, Yong
[1
]
Liu, Zizheng
[1
]
Wang, Zongping
[1
]
Xue, Miaomiao
[1
]
Zhu, Xianchen
[1
]
Tao, Tao
[1
]
机构:
[1] Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, Wuhan 430074, Peoples R China
基金:
高等学校博士学科点专项科研基金;
中国国家自然科学基金;
关键词:
Propranolol;
Fe(III)-citrate system;
Photodegradation;
Neutral pH;
RECEPTOR-BLOCKING PHARMACEUTICALS;
AQUEOUS-SOLUTION;
BETA-BLOCKERS;
HYDROXYL RADICALS;
WASTE-WATER;
PHOTOCATALYTIC DEGRADATION;
OXIDATION;
PH;
PHOTOLYSIS;
REMOVAL;
D O I:
10.1016/j.jhazmat.2011.07.081
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
Photogeneration of HO(center dot) was optimized in Fe(III)-citrate solution within the pH range of 3.0-9.0 to investigate its photoreactivity at neutral pH without the addition of H(2)O(2) under simulated sunlight. The generation of HO(center dot) decreased with increasing pH within the range of 6.0-9.0 at the Fe(III)-to-citrate ratio of 10:50 (10(-6) M). However, when the concentration of citrate increased to 1.5 x 10(-4) M, the formation rate of HO(center dot) increased in the order of pH 9.0 < 3.0 < 7.0 < 4.0 < 5.0. The pH-dependent HO(center dot) production was governed by the stability of Fe(II)/Fe(II)-citrate and the amount of O(2) in the solution. Propranolol can be efficiently photodegraded in Fe(III)-citrate system at pH 7.0 with pseudo-first-order constant 3.1 x 10(-4) s(-1). HO(center dot) was verified to be the main reactive oxygen species (ROS) responsible for the photodegradation of propranolol. The presence of metal ions inhibited the Fe(III)-cit-induced photodegradation in the order of Mn(2+) > Cu(2+) > Ca(2+) > Mg(2+). Both humic acid (HA) and fulvic acid (FA) markedly suppressed the degradation of propranolol. Moreover, the iron in Fe(III)-citrate system was reused by a simple addition of citrate to the reaction solution. By GC-MS analysis, the photoproducts of the propranolol were identified and the degradation pathway was proposed. This work suggests that Fe(III)-citrate complexes are good alternative for the advanced treatment of organic pollutants at neutral pH in aqueous solution. (C) 2011 Elsevier B.V. All rights reserved.
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页码:202 / 208
页数:7
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