典型水环境因素对聚酯微塑料沉降的影响机制研究

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Abstract In this study, the sedimentation behaviors of polyethylene terephthalate (PET) microplastic in aquatic environment were investigated under various electrolyte concentration, electrolyte type, and pH conditions. The results indicated that PET microplastic sedimentation was significantly enhanced with electrolyte concentration, and the minimum standardized concentration (C/C₀) was 0.64. The similar electrolytes showed similar impacts on PET microplastic sedimentation. However, compared with 1-1electrolytes (e.g. NaCl and KCl), the 1-2electrolytes (e.g. CaCl₂ and MgCl₂) remarkably improved PET microplastic sedimentation. PET microplastic sedimentation in aquatic environment was enhanced with decreasing pH. When pH values decreased from 10 to 4, the maximum C/C₀ of PET microplastic suspension decreased from 0.98 to 0.76. The one-site kinetic settlement model well described PET microplastic sedimentation in aquatic environment. The tendency of DLVO results was consistent with the experimental results, which may reflect the sedimentation behaviors of PET microplastic. Findings from this work were useful on improving current knowledge of microplastic environmental behaviors and providing theoretical basis for environmental risk evaluation of microplastic.

Key words： PET microplastic sedimentation mechanism electrolyte concentration electrolyte type pH

Received: 12 June 2020

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	Articles by authors
	DONG Shu-nan
	XIA Ji-hong
	WANG Wei-mu
	LIU Hui
	SHENG Li-ting

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DONG Shu-nan,XIA Ji-hong,WANG Wei-mu等. Effect mechanism of aquatic environmental factor on the sedimentation of polyethylene terephthalate microplastic[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 735-742.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/735

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