Cu(OH)(2)nanorods undergo sulfidation in water: in situ formation of CuO nanorods as intermediates and enhanced toxicity toEscherichia coli

文献类型： 外文期刊

第一作者： Su, Heming

作者： Su, Heming;Qian, Xiaoting;Lou, Haijin;Bian, Xinyun;Li, Lingxiangyu;Gu, Zhouhang;Xu, Zhenlan;Zeng, Tao;Lin, Daohui;Filser, Juliane

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关键词： Cu(OH)(2)nanorods; Sulfidation; In situ transformation; Dissolved oxygen; Escherichia coli

期刊名称：ENVIRONMENTAL CHEMISTRY LETTERS （ 影响因子：9.027； 五年影响因子：8.216 ）

ISSN： 1610-3653

年卷期： 2020 年 18 卷 5 期

页码：

收录情况： SCI

摘要： Fate and risk of nanomaterials in the environment have attracted wide attention over the years. Copper hydroxide (Cu(OH)(2)) nanorods have been used as antibacterial nanomaterials in agricultural products, leading to their release into the environment. Yet, knowledge about the transformation of Cu(OH)(2)nanorods is currently scarce, representing a potential for the environment. Here we investigated the sulfidation process of Cu(OH)(2)nanorods by dissolved sulfide (Na2S) in aqueous solutions with varied molar ratios of Cu(OH)(2)nanorods versus Na2S. The solid products were characterized with focus on the roles of dissolved oxygen (DO) and dissolved sulfide on CuS formation. The impact of sulfidation on the toxicity of Cu(OH)(2)nanorods for Escherichia coliwas also investigated. Copper oxide (CuO) nanorods with comparable morphology to Cu(OH)(2)nanorods were identified as the intermediate of Cu(OH)(2)nanorods sulfidation. We proposed that in situ formation of self-assembly CuS nanorods was achieved through an anion-exchange reaction between O(2-)of CuO and S(2-)of Na2S. We found that sulfidation enhanced the toxicity of Cu(OH)(2)nanorods toE. coli: the inhibition ofE. coligrowth increased from 1.2 to 22.6% with increasing sulfidation due to an increase of dissolved Cu concentration.

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