Abstract

The study illustrates the use of polyelectrolyte multilayer (PEM) membranes prepared with weak/strong polyelectrolyte combination of poly(ethyleneimine)/chondroitin sulfate A (PEI/CS) for the removal of metolachlor (MTR) from water samples. The proposed PEM membranes were characterized by chemical, physical, thermal, and morphological properties. The removal of MTR herbicide by PEI/CS multilayer deposited on a microfiltration polyamide membrane was found to be efficient with a retention rate of about 96.46% for 8 bilayers sat an excellent permeate flux of 6.27 m³/m² day. The photodegradation of metolachlor which got trapped in PEMs in the presence of riboflavin (Rb) sensitizer was investigated at various concentrations. A comparative study on photo-elimination of MTR without the presence of Rb was also done. The degradation time was greatly shortened from more than 1 h for direct photolysis to 5–15 min depending on the initial concentration of the sensitizer. The degradation of metolachlor in the presence of Rb as well as direct photolysis was also experimentally studied.

中文翻译：

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聚电解质多层膜去除和光降解异丙甲草胺除草剂

摘要

该研究说明了使用由聚乙烯亚胺/硫酸软骨素 A (PEI/CS) 的弱/强聚电解质组合制备的聚电解质多层 (PEM) 膜用于去除水样中的异丙甲草胺 (MTR)。所提出的 PEM 膜具有化学、物理、热和形态特性的特征。发现通过沉积在微滤聚酰胺膜上的PEI/CS多层去除MTR除草剂是有效的，8个双层的保留率为约96.46%，渗透通量为6.27 m 3 / ^m 2^天。在核黄素 (Rb) 敏化剂存在下，研究了不同浓度下捕获在 PEM 中的异丙甲草胺的光降解情况。还对不存在 Rb 的情况下 MTR 的光消除进行了比较研究。根据敏化剂的初始浓度，降解时间从直接光解的 1 多小时大大缩短到 5-15 分钟。还对异丙甲草胺在铷存在下的降解以及直接光解进行了实验研究。