期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 472, 期 -, 页码 130-136出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2013.11.005
关键词
Parabens; Photodegradation; Fe(III)-citrate; Matrix effect; Mechanism
资金
- National Natural Science Foundation of China [21007018, 21377034]
- Research Fund of State Key Laboratory of Environmental Chemistry and Ecotoxicology [KF2011-02]
The photodegradation of four parabens including methyl-, ethyl-, propyl-, and butyl-paraben in the presence of Fe(III)-citrate complexes under simulated sunlight was investigated. The degradation of parabens increased with decreasing pH within the range of 5.0-8.0 at the Fe(III)-to-citrate ratio of 10:150 (mu M). The addition of low-molecular-weight carboxylic acids showed different effects on the photodegradation of methylparaben. The low-photoreactive carboxylic acids inhibited the photodegradation of methylparaben in the order of formic acid > succinic acid > acetic acid > malonic acid. In contrast, oxalic acid enhanced the photodegradation and exhibited appreciable synergistic effect with Fe(III)-citrate at concentration higher than 500 mu M. Up to 99.0% of substrate was degraded after 30 min at pH 6.0 in the Fe(III)-citrate-oxalate system. The various fractions of fulvic acid inhibited the photodegradation of methylparaben. The inhibition increased with increasing nominal molecular weight of fractionated fulvic acid. Moreover, the photodegradation of methylparaben was inhibited in natural waters in the order of Liangzi Lake < Donghu Lake < Changjiang River approximate to Seawater. The photoproducts of methylparaben were identified by GC-MS analyses and the degradation pathway was proposed. (c) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据