Removal of parabens and their chlorinated by-products by periphyton: influence of light and temperature

文献类型： 外文期刊

第一作者： Song, Chaofeng

作者： Song, Chaofeng;Hu, Hongjuan;Ao, Hongyi;Wu, Chenxi;Song, Chaofeng;Wu, Yonghong

作者机构：

关键词： Microbial community; Preservatives; Metabolites; Dissipation; Carbon source utilization; Aquatic ecosystem

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

年卷期： 2017 年 24 卷 6 期

页码：

收录情况： SCI

摘要： The extensive use of parabens as preservatives in food and pharmaceuticals and personal care products results in frequent detection of their residuals in aquatic environment. In this work, the adsorption and removal of four parabens (methyl-, ethyl-, propyl-, and butyl-paraben) and two chlorinated methyl-parabens (CMPs) by periphyton were studied. Characteristics of the periphyton were identified to explore the possible relationship between paraben removal and periphyton properties. Results showed that linear adsorption coefficients (K-d) vary from 554.4 to 808.6 L kg(-1) for the adsorption parabens and CMPs to autoclaved periphyton. The adsorption strength is positively related to the hydrophobicity of these compounds. Removal of parabens from water by periphyton was efficient with half-life (t(1/2)) values estimated using firstorder kinetic model ranging from 0.49 to 3.29 days, but CMPs were more persistent with t(1/2) ranging from 1.15 to 25.57 days, and t(1/2) increased with the chlorination degree. Higher incubation temperature accelerated the removal of all tested compounds, while a better removal of CMPs was observed in dark condition. Analysis of periphyton properties suggests that bacteria played a more important role in the removal of CMPs, but no specific relationship between periphyton properties and paraben removal ability can be established.

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