Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China; Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China.
Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, College of Life Science and Technology, Jinan University, Guangzhou 510632, China.
Sci Total Environ. 2022 Oct 15;843:157042. doi: 10.1016/j.scitotenv.2022.157042. Epub 2022 Jun 28.
With the rapid development of the nano-material and chemical industry, more and more microplastic (MP) and nano-material were discharged into the environment. In this study, a two-dimensional (2D) surface of Extended Darjaguin-Landau-Verwe-Overbeek (XDLVO) is proposed to quantitatively investigate the effect of polyamide (PA) on the transport of graphene oxide (GO) in porous media. The influences of mass fraction of PA, flow rate, GO concentration, ionic type and strength on the migration of GO in saturated porous media are investigated by column experiments and numerical models. The two-dimensional (2D) surfaces of XDLVO interaction energy between GO and GO, GO and QS, GO and PA, are firstly calculated to analyze the transport of GO in saturated porous media. Experimental results suggest the mobility of GO is enhanced when flow velocity and initial concentration of GO are increased. However, the mobility of GO is inhibited when the mass fraction of PA and ionic strength are increased. More important, the inhibitory effect of divalent cations on GO migration is stronger than that of monovalent cations. Simultaneously, XDLVO results suggest that ionic types and strengths are important factors affecting the mobility of GO in porous media, and the critical ionic strength is observed from the continuous variation of the secondary minimum trap of XDLVO interaction energy. Model results show that there is a linear relationship between the logarithm of the secondary minimum trap of XDLVO interaction energy and the parameters related to GO mobility, which suggests XDLVO energy surface has an important application significance in the accurate quantification of GO mobility in porous media. These findings contribute to GO transport affected by microplastic in porous media, thus laying a significant foundation for the environmental risk and contamination remediation.
随着纳米材料和化学工业的飞速发展，越来越多的微塑料（MP）和纳米材料被排放到环境中。在本研究中，提出了二维（2D）扩展达杰林-朗道-维韦-奥弗贝克（XDLVO）表面来定量研究聚酰胺（PA）对氧化石墨烯（GO）在多孔介质中传输的影响。通过柱实验和数值模型研究了 PA 的质量分数、流速、GO 浓度、离子类型和强度对饱和多孔介质中 GO 迁移的影响。首先计算了 GO 之间、GO 和 QS 之间、GO 和 PA 之间的二维（2D）XDLVO 相互作用能表面，以分析 GO 在饱和多孔介质中的传输。实验结果表明，当流速和 GO 的初始浓度增加时，GO 的迁移率会增强。然而，当 PA 的质量分数和离子强度增加时，GO 的迁移率会受到抑制。更重要的是，二价阳离子对 GO 迁移的抑制作用强于一价阳离子。同时，XDLVO 结果表明，离子类型和强度是影响 GO 在多孔介质中迁移率的重要因素，并且可以从 XDLVO 相互作用能二次最小陷阱的连续变化中观察到临界离子强度。模型结果表明，XDLVO 相互作用能二次最小陷阱的对数与与 GO 迁移率相关的参数之间存在线性关系，这表明 XDLVO 能量表面在准确量化 GO 在多孔介质中的迁移率方面具有重要的应用意义。这些发现有助于了解微塑料对多孔介质中 GO 传输的影响，从而为环境风险和污染修复奠定了重要基础。
