Interaction of Dissolved Organic Matters and Microplastics Regulates the Transport of Microplastics in Saturated Porous Media

• DOI: 10.1021/acsestengg.3c00615
• Publication Date: 2024-04-13T13:19:02Z
• Authors: Miao-Miao Tan; Li-Juan Feng; Song-Zu Bian; Jian-Lu Duan; Xiao-Hua Li; Xiao-Dong Sun; Yu-Chen Sun; Shu-Guang Wang; Xian-Zheng Yuan
• Keywords: DLVO theory; Hydrophobic effect; Biofouling; Isothermal Titration Calorimetry

The transport behavior of microplastics in soil environments is significantly affected by dissolved organic matter (DOM). However, the regulation different types DOM on media poorly understood, especially at a quantitative level. In this study, we found that three DOM, humic acid (HA), bovine serum albumin (BSA), and sodium alginate (SA), promoted polystyrene (PS) column experiments. PS was stronger with increasing concentrations. Among HA mobility most due to electrostatic repulsion steric hindrance. Through combination Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, isothermal titration calorimetry (ITC), colloidal atomic force microscopy (AFM), interactions between HA, as well BSA, were mainly van der Waals forces, hydrogen bonding, hydrophobic forces. contrast, SA mostly bonding results provide deep understanding interfacial interaction process, based both experimental measurements model predictions, are great significance evaluate fate environments.