聚乙烯和聚氯乙烯微塑料对邻苯二甲酸酯的吸附  

Adsorption of Polyethylene and Polyvinyl Chloride to Phthalate Esters

作　　者：孙淑 孟硕 周震峰[1,2] SUN Shu;MENG Shuo;ZHOU Zhenfeng(College of Resources&Environment,Qingdao Agricultural University,Qingdao 266109,China;Qingdao Research Center of Rural Environmental Engincering,Qingdao 266109,China)

机构地区：[1]青岛农业大学资源与环境学院,山东青岛266109 [2]青岛市农村环境工程研究中心,山东青岛266109

出　　处：《环境科学与技术》2022年第8期9-16,共8页Environmental Science & Technology

基　　金：国家自然科学基金项目(41201507);宁夏回族自治区重点研发计划项目(2021BEG03013);山东省大学生创新创业训练计划项目(S202110435094)。

摘　　要：环境介质中普遍存在的微塑料被认为是有机污染物迁移转化的有效载体,探究微塑料与有机污染物的相互作用已成为环境领域的研究热点。该文选择邻苯二甲酸二甲酯(DMP)和邻苯二甲酸二乙酯(DEP)作为目标污染物,重点考察2种典型微塑料聚乙烯(PE)和聚氯乙烯(PVC)对DMP和DEP的吸附行为及机理。结果表明,2种微塑料均能够吸附DMP和DEP。PE的吸附量大于PVC,与微塑料的种类以及比表面积和孔隙率有关。同一种微塑料对DEP的吸附能力大于DMP,主要与污染物的理化性质有关。准二级动力学模型能够描述2种微塑料对DMP和DEP吸附动力学过程,颗粒内扩散和膜扩散参与控制其吸附过程。吸附等温线可以用Linear模型、Langmuir模型和Freundlich模型进行拟合,其吸附过程由疏水分配作用主导,同时存在微孔填充作用。Microplastics that are ubiquitous in environmental media are considered to be effective carriers for the migration and transformation of organic pollutants. Exploring the interaction between microplastics and organic pollutants has become a research hotspot in the environmental field. In this paper, dimethyl phthalate(DMP) and diethyl phthalate(DEP) were selected as the target pollutants, and the adsorption behavior and mechanism of two typical microplastics polyethylene(PE)and polyvinyl chloride(PVC) to DMP and DEP were mainly studied. The results show that the two kinds of microplastics have adsorption capacity for DMP and DEP, and the adsorption capacity of PE is greater than that of PVC, which may be related to the type of microplastics and the specific surface area and porosity. The adsorption capacity of the same microplastic to DEP is greater than that of DMP, which is mainly related to the physical and chemical properties of pollutants. The pseudosecond-order model can well describe the adsorption kinetic process of two microplastics to DMP and DEP, both intraparticle and film diffusion could dominate the adsorption. The adsorption isotherm can be well fitted by the Linear model, the Langmuir model and the Freundlich model. The adsorption process is distributed by hydrophobicity. The role is dominant, and there may be a micropore filling effect.

关 键 词：微塑料 邻苯二甲酸酯 吸附 动力学 

分 类 号：X132[环境科学与工程—环境科学]