研究报告
林陆健,汤帅,孙璇,冯安芯,梁伟,王学松.铅离子和四环素在微塑料表面的吸附机理与协同效应[J].环境科学学报,2021,41(10):4022-4031
铅离子和四环素在微塑料表面的吸附机理与协同效应
- Adsorption of Pb(Ⅱ) ions and tetracycline onto microplastics: Interaction mechanisms and synergistic effects
- 基金项目：江苏省高等学校自然科学重点基金项目（No.19KJA430009）；江苏省研究生科研与实践创新计划项目（No.KYCX20-2787，KYCX19-2274）
- 作者
- 单位
- 林陆健
- 江苏海洋大学环境与化学工程学院, 连云港 222000
- 汤帅
- 江苏海洋大学环境与化学工程学院, 连云港 222000
- 孙璇
- 江苏海洋大学环境与化学工程学院, 连云港 222000
- 冯安芯
- 江苏海洋大学环境与化学工程学院, 连云港 222000
- 梁伟
- 江苏海洋大学环境与化学工程学院, 连云港 222000
- 王学松
- 江苏海洋大学环境与化学工程学院, 连云港 222000
- 摘要：水环境中存在的微塑料能够显著地影响无机或者有机物污染物的迁移和转化.本文探究了Pb （II）和四环素（TC）在聚氯乙烯（PVC）和聚酰胺（PA）微塑料上的吸附特征与作用机制.结果表明，在二元体系中，TC与Pb （Ⅱ）相互促进在PVC和PA表面上的吸附行为，呈现出协同效应.PA和PVC对TC的吸附等温线呈高度的线型，而PA对Pb （II）的吸附过程则符合Langmuir模型.溶液pH值显著地影响TC和Pb （II）在PVC和PA表面的吸附.溶液中NaCl的存在明显地降低了PA对Pb （Ⅱ）的吸附，但对TC吸附特征影响很小.傅里叶红外光谱（FTIR）和X射线光电子能谱（XPS）分析表明，PVC主要通过疏水相互作用键合TC，而PA则主要通过氢键和疏水相互作用与TC作用，通过静电相互作用与Pb （II）结合.本研究结果加深了对微塑料与污染物之间作用机制的理解，可为环境中微塑料风险评估提供一定的科学依据.
- Abstract：Microplastics can significantly affect the migration and transformation of inorganic or organic pollutants in the water environment. In this study, adsorption properties and interaction mechanisms for Pb(Ⅱ) and TC adsorption onto polyvinyl chloride (PVC) and polyamide (PA) microplastics were investigated. In binary systems, TC and Pb(Ⅱ) mutually promoted adsorption behavior onto the surface of PVC and PA, which presented a synergistic effect. Adsorption isotherms of TC onto PVC and PA were highly linear. However, the adsorption process of Pb(II) onto PA was better simulated with Langmuir model. Solution pH played a significant role in the adsorption of TC and Pb(Ⅱ) onto PVC and PA. The effect of NaCl content on the adsorption of TC onto the two microplastics was negligible. However, the increase of NaCl content resulted in the decrease of Pb(Ⅱ) adsorption onto PA. Results of Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis showed that PVC bonded with TC mainly through hydrophobic interaction, while PA interacted with TC mainly through hydrogen bond and hydrophobic interaction; electrostatic interaction was the major interaction mechanism between PA and Pb(Ⅱ). Results of this study deepen the understanding of the interaction mechanisms between microplastics and pollutants, and provide a scientific basis for the risk assessment of microplastics in the environment.
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