PE 微塑料在天然水环境三元体系中对 Cr(VI)离子的吸附机制。
The mechanism for adsorption of Cr(VI) ions by PE microplastics in ternary system of natural water environment.
机构信息
School of Water Conservancy & Environment, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan, 450001, PR China; Zhengzhou Key Laboratory of Water Resource and Environment, Zhengzhou, 450001, China; Henan Key Laboratory of Groundwater Pollution Prevention and Rehabilitation, Zhengzhou, 450001, China; Henan Province Key Laboratory of Water Pollution Control and Rehabilitation Technology, Pingdingshan, Henan, PR China.
School of Water Conservancy & Environment, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, Henan, 450001, PR China; Zhengzhou Key Laboratory of Water Resource and Environment, Zhengzhou, 450001, China; Henan Key Laboratory of Groundwater Pollution Prevention and Rehabilitation, Zhengzhou, 450001, China.
出版信息
Environ Pollut. 2020 Feb;257:113440. doi: 10.1016/j.envpol.2019.113440. Epub 2019 Oct 25.
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 when the dosage of PE microplastics was increased from 2 to 14 g ⋅L at pH of 5 with addition of SDBS, compared with increasing adsorption capability from 0.03 to 0.32 mg⋅g 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 CrO 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.
更多的注意力集中在微塑料与环境污染物的附着上。本文研究了在十二烷基苯磺酸钠（SDBS）存在的情况下，聚乙烯（PE）珠粒（一种典型的微塑料）和六价铬（Cr（VI））离子的吸附性能。在不同条件下，即 PE 剂量、pH 和 SDBS 浓度下，进行了 PE 微塑料对 Cr（VI）离子的吸附实验。当添加 SDBS 时，PE 微塑料的剂量从 2 增加到 14 g·L -1 ，在 pH 值为 5 的条件下，Cr（VI）离子的吸附能力从 0.39 增加到 1.36mg·g -1 ，与不添加 SDBS 时从 0.03 增加到 0.32mg·g -1 的吸附能力相比有所提高。pH 值会影响有无 SDBS 存在时的吸附能力。当 pH 值小于 6 时，添加 SDBS 会促进 Cr（VI）的吸附能力；然而，当 pH 值大于 6 时，会出现相反的趋势，这是由于 SDBS 会与 CrO 4 2- 竞争占据 PE 微塑料的吸附位点。SDBS 浓度会影响 Cr（VI）离子在 PE 微塑料上的吸附性能。吸附容量的峰值出现在 SDBS 浓度在 1 到 1.5 mM 之间。这项研究为研究 SDBS 对 PE 微塑料吸附重金属性能的影响提供了依据，以模拟这三种污染物的表面附着模型。
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