Effect of algal organic matter (AOM) extracted from Microcystis aeruginosa on photo-degradation of Diuron
Effect of algal organic matter (AOM) extracted from Microcystis aeruginosa on photo-degradation of Diuron
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铜绿微囊藻提取的藻类有机物（AOM）对敌草隆光降解的影响
DOI：
10.1016/j.cej.2015.06.091
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发表时间：
2015-12
影响因子：
15.1
通讯作者：
Lu, Ning
中科院分区：
文献类型：
--
作者：
Yu, Shuili;Yin, Daqiang;Gao, Naiyun;Lu, Ning
饮用水源中藻类有机物（AOM）和新兴有机污染物的存在近年来受到越来越多的关注。然而，这两种有害共存化合物在水源中的相互作用很少报道。研究了在紫外和可见光（VL）照射下，细胞内有机物（IOM）和细胞外有机物（EOM）对敌草隆（Diuron）光降解的影响。动力学分析表明，敌草隆的直接和间接光解均符合准一级反应（R2> 0.98）。敌草隆在紫外光照射下被迅速去除，并伴随着AOM的轻微影响。在VL照射下，IOM中的光激发藻蓝蛋白能够加速敌草隆的降解，而IOM中其他有机物的共存则由于屏蔽效应抑制了反应，导致敌草隆降解的总体速率较慢。相比之下，EOM促进反应时，pH值超过5.0。在IOM和EOM存在下，AOM介导的三重态DOM（3DOM-3）的产生分别占敌草隆去除率的82%和64%。AOM在溶液中产生的光谱激发-发射矩阵证明了共存AOM对敌草隆降解的主要机制。
The presence of algal organic matter (AOM) and emerging organic contaminants in surface drinking water sources has received increasing attention recently. Nevertheless, interactions between these two harmful co-existing compounds in water sources have rarely been reported. This study investigated the influence of AOM, including intracellular organic matter (IOM) and extracellular organic matter (EOM), on the photo-degradation of Diuron, under UV and visible light (VL) irradiation. Kinetics analyses indicated that both the direct and indirect photolysis of Diuron followed a pseudo-first-order reaction (R2> 0.98). Diuron was rapidly removed under UV irradiation accompanied by minor impacts from AOM. Under VL irradiation, the photo-excited phycocyanin in the IOM was capable of accelerating Diuron degradation, whereas the coexistence of other organic compounds in the IOM inhibited the reaction due to a screening effect, resulting in a slower overall rate of Diuron degradation. By comparison, EOM promoted the reactions when pH exceeded 5.0. The AOM-mediated generation of triplet DOM (3DOM∗) accounted for 82% and 64% of the Diuron removal in the presence of IOM and EOM, respectively. Spectral excitation–emission matrices produced by AOM in solutions demonstrated the primary mechanisms of the co-existing AOM on Diuron degradation.
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影响因子：
12.8
作者：
Huacheng Xu;Haiyuan Cai;Guanghui Yu;Helong Jiang
通讯作者：
Huacheng Xu;Haiyuan Cai;Guanghui Yu;Helong Jiang
影响因子：
11.4
作者：
Walse, SS;Morgan, SL;Ferry, JL
通讯作者：
Ferry, JL
DOI：
10.1002/(sici)1099-1409(199908/10)3:6/7
发表时间：
1999-08
影响因子：
1.5
作者：
Peter K. J. Robertson;L. Lawton;Benjamin J P A Cornish
通讯作者：
Peter K. J. Robertson;L. Lawton;Benjamin J P A Cornish
影响因子：
12.8
作者：
S. Sanchis;A. Polo;M. Tobajas;Juan J. Rodríguez;Á. F. Mohedano
通讯作者：
S. Sanchis;A. Polo;M. Tobajas;Juan J. Rodríguez;Á. F. Mohedano
影响因子：
2.9
作者：
R. Zepp;M. M. Gumz-M.;A. L. Miller;H. Gao
通讯作者：
R. Zepp;M. M. Gumz-M.;A. L. Miller;H. Gao