State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
Sci Total Environ. 2023 Jul 1;880:163261. doi: 10.1016/j.scitotenv.2023.163261. Epub 2023 Apr 5.
Microplastics (MPs) widely exist in all kinds of water bodies. The physical and chemical properties of MPs make them easy to become the carrier of pollutants, but the interaction between disinfection by-products (DBPs) and MPs has not been studied yet. In this study, the occurrence of emerging high-toxic chlorophenylacetonitriles (CPANs) in wastewater treatment plant (WWTP) effluents was determined. CPANs ubiquitously existed in WWTP effluents, and the concentration ranged from 88 ± 5 ng/L to 219 ± 16 ng/L. The typical MPs (i.e., polyethylene (PE), polyethylene terephthalate (PET), and polystyrene (PS)) were selected to study their adsorption of CPANs. Adsorption kinetics and isotherm analysis were carried out. The maximum Langmuir adsorption capacities were 8.602 ± 0.849 to 9.833 ± 0.946 μg/g for PE, 13.340 ± 1.055 to 29.405 ± 5.233 μg/g for PET, and 20.537 ± 1.649 to 43.597 ± 1.871 for PS. Dichloro-CPANs had higher adsorption capacity than monochloro-CPANs. After that, the specific surface area, contact angle, FTIR spectrum, crystallinity, and glass transition temperature (Tg) of MPs were measured. Based on the analysis of the properties of both MPs and CPANs, the mechanism of adsorption was studied. The adsorption of CPANs on PE was mainly affected by pore-filling and van der Waals force. In addition to these two factors, the adsorption of PET was also affected by hydrophobic interaction. Due to the substituents on the benzene ring, there was π-π interaction between PS and CPANs, which might be the reason why PS had the highest adsorption capacity for CPANs. Finally, the effects of pH and dissolved organic matter were studied, and their effects were relatively limited. The results indicated that MPs may adsorb CPANs in actual WWTP effluents, and special attention should be paid to the possible impacts on the aquatic environment caused by the transfer of CPANs on MPs.
微塑料（MPs）广泛存在于各种水体中。MPs 的物理化学性质使其容易成为污染物的载体，但消毒副产物（DBPs）与 MPs 之间的相互作用尚未得到研究。本研究确定了污水处理厂（WWTP）废水中新兴高毒性氯代苯乙腈（CPANs）的发生情况。CPANs 普遍存在于 WWTP 废水中，浓度范围为 88±5ng/L 至 219±16ng/L。选择典型的 MPs（即聚乙烯（PE）、聚对苯二甲酸乙二醇酯（PET）和聚苯乙烯（PS））来研究它们对 CPANs 的吸附。进行了吸附动力学和等温线分析。PE 的最大 Langmuir 吸附容量为 8.602±0.849 至 9.833±0.946μg/g，PET 的最大 Langmuir 吸附容量为 13.340±1.055 至 29.405±5.233μg/g，PS 的最大 Langmuir 吸附容量为 20.537±1.649 至 43.597±1.871μg/g。二氯-CPANs 的吸附容量高于一氯-CPANs。之后，测量了 MPs 的比表面积、接触角、FTIR 光谱、结晶度和玻璃化转变温度（Tg）。基于 MPs 和 CPANs 的性质分析，研究了吸附机制。CPANs 在 PE 上的吸附主要受孔填充和范德华力的影响。除了这两个因素外，PET 的吸附还受疏水相互作用的影响。由于苯环上的取代基，PS 与 CPANs 之间存在π-π相互作用，这可能是 PS 对 CPANs 具有最高吸附能力的原因。最后，研究了 pH 和溶解有机物的影响，它们的影响相对有限。结果表明，MPs 可能在实际 WWTP 废水中吸附 CPANs，应特别注意 CPANs 在 MPs 上转移可能对水生环境造成的影响。
