纳米塑料在环境中运输迁移后表面会产生氨基官能团,易与抗生素形成复合污染物。选取400 nm氨基官能化聚苯乙烯纳米塑料(PSNPs-NH₂)与氟喹诺酮类抗生素培氟沙星(PEF)、依诺沙星(ENO)为研究对象,研究PEF、ENO在PSNPs-NH₂上的吸附行为,探讨环境条件对吸附的影响。结果表明,PSNPs-NH₂对PEF和ENO的最大吸附量分别为331.235 mg/g和345.065 mg/g,吸附动力学均符合拟二级动力学模型,吸附速率受外扩散和颗粒内扩散控制,吸附等温线符合langmuir模型。强酸强碱、盐度、Cu²⁺、Zn²⁺抑制PSNPs-NH₂吸附PEF和ENO,海藻酸钠抑制PSNPs-NH₂吸附PEF。量子化学计算结果表明,该吸附行为主要通过氢键和范德华力进行,范德华最大穿透距离为PEF-PSNPs-NH₂(1.19 Å)、ENO-PSNPs-NH₂(1.20 Å)。

After transportation and migration in the environment,amino functional groups will be generated on the surface of nano-plastics,which are easy to form complex pollutants with antibiotics.To solve this problem,400 nm amino-functionalized polystyrene nano-plastics (PSNPs-NH₂) and fluoroquinolone antibiotics including pefloxacin and enoxacin are selected as objects to study the adsorption behavior of pefloxacin or enoxacin on PSNPs-NH₂,and to explore the influence of environmental conditions on adsorption.Study results show that the maximum adsorption capacities of PSNPs-NH₂ for pefloxacin and enoxacin are 331.235 mg·g^-1 and 345.065 mg·g^-1,respectively.Their adsorption kinetics accords with the pseudo-second-order kinetic model,the adsorption speed is controlled by external diffusion and intraparticle diffusion,and the adsorption isotherm is consistent with Langmuir model.High acidity,high alkalinity,salinity,Cu²⁺,and Zn²⁺ inhibit PSNPs-NH₂ adsorption for pefloxacin and enoxacin,sodium alginate inhibits PSNPs-NH₂ adsorption for pefloxacin.The results from quantum chemistry calculation show that this adsorption behavior performs mainly through hydrogen bond and Van der Waals force,and the maximum Van der Waals penetration distance is 1.19 Å for pefloxacin-PSNPs-NH₂,and 1.20 Å for enoxacin-PSNPs-NH₂.

姚美婧(1999-),女,硕士生,研究方向为污废水处理技术,984347528@qq.com;李亚男(1983-),女,博士,副教授,研究方向为污废水处理技术,通讯联系人,liyanan@tyut.edu.cn。