• 关键词：纳米塑料  聚苯乙烯  铅离子  吸附  吸附动力学  吸附等温线  NaCl溶液

• 基金项目：山西省基础研究计划项目（No.2015021119）；自然资源部生态地球化学重点实验室开放基金（No.ZSDHJJ201804）；山西省2019年度研究生教育改革研究课题项目

• 李亚男
• 太原理工大学环境科学与工程学院，晋中 030600

• 陈梦洁
• 太原理工大学环境科学与工程学院，晋中 030600;比亚迪汽车工业有限公司，深圳 518118

• 吴渊
• 太原理工大学环境科学与工程学院，晋中 030600

• 纪伟
• 太原理工大学环境科学与工程学院，晋中 030600

• 张国凯
• 中海国亚环保工程有限公司，太原 030006

• 王嘉琪
• 太原理工大学环境科学与工程学院，晋中 030600

• 李佳洁
• 太原理工大学矿业工程学院，太原 030024

• 摘要：纳米塑料作为一种新兴污染物在水中可长久稳定存在，其表面吸附的重金属对水环境产生了潜在危害.本文研究了纳米塑料聚苯乙烯微球在吸附时间、溶液pH、氯化钠溶液、锰离子、温度等不同实验条件下对铅离子的吸附行为.结果表明，粒径为400 nm的单分散聚苯乙烯微球可快速吸附铅离子，吸附平衡时间约为30 min，吸附率达到53.30%.聚苯乙烯微球对铅离子的吸附动力学符合伪一级动力学，吸附等温线遵循Freundlich模型，吸附过程主要为非线性吸附.随着溶液pH的增加，铅离子平衡吸附量增加，静电作用是影响铅离子在聚苯乙烯微球上吸附的关键因素.增加溶液盐浓度，微塑料发生聚集，比表面积减小，吸附位点减少，铅离子的吸附量显著降低，在3.5%氯化钠溶液中，纳米塑料对铅离子的吸附率仅为7.5%.与重金属锰离子共存，可促进聚苯乙烯微球对铅离子的吸附.升高温度，纳米塑料对铅离子的平衡吸附量增加.

• Abstract：Nanoplastics， as a new type of pollutant， can exist in water for a long time， and the adsorption of heavy metals on its surface has caused potential harm to the water environment. In this paper， the adsorption behavior of lead ions on nanoplastics polystyrene microspheres was studied under different experimental conditions， including adsorption time， pH value of solution， sodium chloride solution， manganese ions and temperature. The results showed that the monodisperse polystyrene microspheres with the particle size of 400 nm could adsorb lead ions rapidly， with the adsorption equilibrium time of about 30 min and the absorption efficiency 53.30%. The adsorption kinetics of lead ions by polystyrene microspheres conformed to the pseudo-first-order kinetics. The adsorption isotherm followed the Freundlich model， and the adsorption process was mainly nonlinear adsorption. The equilibrium adsorption capacity of lead ions improved with the increase of solution pH. Electrostatic action was the key factor affecting the adsorption of lead ions on the polystyrene microspheres. The increase of the concentration of sodium chloride solution caused the aggregation of nanoplastics and the decrease of both the specific surface area and the adsorption sites， leading to the significant decline of adsorption amount of lead ions. The adsorption rate of nanoplastics to lead ion was only 7.5% at the concentration of 3.5% sodium chloride solution. Coexistence with manganese ions promoted the adsorption of lead ions on polystyrene microspheres. With the increase of temperature， the equilibrium adsorption capacity of lead ions on nanoplastics increased.

• Key words：nanoplastics  polystyrene  lead ions  adsorption  adsorption kinetics  adsorption isotherm  NaCl solution

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