Aggregation kinetics of microplastics in aquatic environment: Complex roles of electrolytes, pH, and natural organic matter

doi:10.1016/j.envpol.2018.02.042

CORC > 重庆绿色智能技术研究院 > 中国科学院重庆绿色智能技术研究院 > 水污染过程与治理研究中心

	Aggregation kinetics of microplastics in aquatic environment: Complex roles of electrolytes, pH, and natural organic matter
	Li, Shuocong 1; Liu, Hong2,3 ; Gao, Rui 1; Abdurahman, Abliz 1; Dai, Juan 1; Zeng, Feng 1
刊名	ENVIRONMENTAL POLLUTION
	2018-06-01
卷号	237 页码:126-132
关键词	Microplastics Aggregation Solution chemistry Derjaguin-Landau-Verwey-Overbeek (DLVO) theory Attachment efficiency Critical coagulation concentration
ISSN号	0269-7491
DOI	10.1016/j.envpol.2018.02.042
英文摘要	Microplastics are an emerging contaminants of concern in aquatic environments. The aggregation behaviors of microplastics governing their fate and ecological risks in aquatic environments is in need of evaluation. In this study, the aggregation behavior of polystyrene microspheres (micro-PS) in aquatic environments was systematically investigated over a range of monovalent and divalent electrolytes with and without natural organic matter (i.e., Suwannee River humic acid (HA)), at pH 6.0, respectively. The zeta potentials and hydrodynamic diameters of micro-PS were measured and the subsequent aggregation kinetics and attachment efficiencies (a) were calculated. The aggregation kinetics of micro-PS exhibited reaction- and diffusion-limited regimes in the presence of monovalent or divalent electrolytes with distinct critical coagulation concentration (CCC) values, followed the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The CCC values of micro-PS were14.9, 13.7, 14.8, 2.95 and 3.20 mM for NaCl, NaNO3, KNO3, CaCl2 and BaCl2, respectively. As expected, divalent electrolytes (i.e., CaCl2 and BaCl2) had stronger influence on the aggregation behaviors of micro-PS as compared to monovalent electrolytes (i.e., NaCl, NaNO3 and KNO3). HA enhanced micro-PS stability and shifted the CCC values to higher electrolyte concentrations for all types of electrolytes. The CCC values of micro-PS were lower than reported carbonaceous nanoparticles CCC values. The CCC[Ca2+]/CCC [Na+] ratios in the absence and presence of HA at pH 6.0 were proportional to Z(-2.34) and Z(-2.30), respectively. These ratios were in accordance with the theoretical Schulze Hardy rule, which considers that the CCC is proportional to z(-6)-z(-2). These results indicate that the stability of micro-PS in the natural aquatic environment and the possibility of significant aqueous transport of micro-PS. (C) 2018 Elsevier Ltd. All rights reserved.
资助项目	National Science Foundation for Distinguished Young Scholars[51525805] ; Natural Science Foundation of China[21377170]
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000431158900013
内容类型	期刊论文
源URL	[http://119.78.100.138/handle/2HOD01W0/6354]
专题	水污染过程与治理研究中心
通讯作者	Zeng, Feng
作者单位	1.Sun Yat Sen Univ, Sch Chem, Guangzhou 510275, Guangdong, Peoples R China 2.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China 3.Guangzhou Univ, Sch Environm Sci & Engn, Key Lab Water Qual & Conservat Pearl River Delta, Minist Educ, Guangzhou 510006, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Li, Shuocong,Liu, Hong,Gao, Rui,et al. Aggregation kinetics of microplastics in aquatic environment: Complex roles of electrolytes, pH, and natural organic matter[J]. ENVIRONMENTAL POLLUTION,2018,237:126-132.
APA	Li, Shuocong,Liu, Hong,Gao, Rui,Abdurahman, Abliz,Dai, Juan,&Zeng, Feng.(2018).Aggregation kinetics of microplastics in aquatic environment: Complex roles of electrolytes, pH, and natural organic matter.ENVIRONMENTAL POLLUTION,237,126-132.
MLA	Li, Shuocong,et al."Aggregation kinetics of microplastics in aquatic environment: Complex roles of electrolytes, pH, and natural organic matter".ENVIRONMENTAL POLLUTION 237(2018):126-132.