The mechanism for adsorption of Cr(VI) ions by PE microplastics in ternary system of natural water environment

微塑料 吸附 化学 水溶液中的金属离子 污染物 金属 环境化学 三元运算 离子 吸附 化学工程 弗伦德利希方程 水溶液 朗缪尔 无机化学 离子强度 朗缪尔吸附模型 有机化学
作者
Wei Zhang,Liying Zhang,Hua Tian,LI Yong-gan,Xing Zhou,Wenxia Wang,Zhangchao You,Shuangfeng Wang,Mengjia Li
出处
期刊:Environmental Pollution [Elsevier BV]
卷期号:257: 113440-113440 被引量:76
标识
DOI:10.1016/j.envpol.2019.113440
摘要

More attention was paid to the attachment between microplastics and environmental pollutants. The adsorption performance of Polyethylene (PE) beads (a typical type of microplastics) and Cr(VI) ions with the existence of sodium dodecyl benzene sulfonate (SDBS) was investigated in this paper. The adsorption experiments of Cr(VI) ions by PE microplastics were conducted at different conditions, i.e. PE doses, pH and SDBS concentrations, respectively. The adsorption capability of Cr(VI) ions was increased from 0.39 to 1.36 mg⋅g-1 when the dosage of PE microplastics was increased from 2 to 14 g ⋅L-1 at pH of 5 with addition of SDBS, compared with increasing adsorption capability from 0.03 to 0.32 mg⋅g-1 without addition of SDBS. The pH would influence the adsorption capability with and without the addition of SDBS. When the pH was less than 6, the adsorption capability of Cr(VI) would be promoted by the addition of SDBS; however, there was a contrast tendency when the pH was more than 6, which was attributed to that SDBS would compete with CrO42- for occupying the adsorption sites of PE microplastic. The SDBS concentration would affect the adsorption performance of Cr(VI) ions onto PE microplastics. The peak of the adsorption capacity was at SDBS concentration between 1 and 1.5 mM. This research would provide a basis for investigating the influence of SDBS on adsorption performance of heavy metal by PE microplastics to simulate the surface attachment model of those three kinds of pollutants.
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