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polypropylene microplastics alter the cadmium adsorption capacity on different soil solid fractions

Frontiers of Environmental Science & Engineering 2022年第1期16卷 65-76页

作者： Xianying Ma Xinhui Zhou Mengjie Zhao Wenzhuo Deng Yanxiao Cao Junfeng Wu Jingcheng Zhou School of Information and Safety Engineering Zhongnan University of Economics and LawWuhan 430073China Research Center for Environment and Health Zhongnan University of Economics and LawWuhan 430073China Wuhan Regen Environmental Remediation Co. LtdWuhan 430073China*

microplastics(MPs)are widely present in a variety of environmental media and have attracted more and more attention ***,the effect of MPs on the interaction between heavy metals and soil,especially in soil solid fraction level,is not well *** this study,batch experiments were performed to investigate the adsorption characteristics of Cd in bulk soil and three soil solid fractions(*** organo matter(POM),organic-mineral compounds(OMC),and mineral)with or without polypropylene(PP)*** results showed that the addition of PP-MPs reduced the Cd adsorption capacity of the bulk soil in aqueous solution,and the effects varied with PP-MPs dose and aging ***,the responses of the three fractions to PP-MPs were *** presence of PP-MPs,the POM and OMC fractions showed negative adsorption effects,while the mineral fraction showed positive *** the bulk soil,POM and OMC fractions,the adsorption isotherm fitted to the Langmuir model better than the Freundlich model,whereas,the Freundlich isotherm model was more fitted for the mineral *** with the comprehensive analysis of the partitioning coefficients,XRD and FTIR results,it was found that OMC fraction extremely likely play a leading role in the bulk soil adsorption of Cd in this ***,the effect of MPs on adsorption capacity of the bulk soil for Cd may be determined by the proportion of POM,OMC,and mineral fractions in the soil,but further confirmation is needed.

关键词： polypropylene microplastics Cadmium Adsorption POM OMC Mineral

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