微米级聚苯乙烯对铜的吸附特性

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Abstract This study systematically investigated the adsorption capacity of polystyrene (PS) plastic micro-spheres (0.5 and 6μm diameter) toward copper ions under the action of factors such as adsorption time, copper ion concentration, PS concentration, particle size and coexisting ions. Copper showed higher adsorbance on 0.5μm PS compared with 6.0μm PS, and the saturated adsorption capacity reached (0.1638±0.0204) and (0.1091±0.0133) mg/mg, respectively. The adsorption equilibrium was reached by 720min, both Pseudo-second-order kinetic model and Elovich model most suitably described the adsorption kinetics of copper, with R² of 0.929、0.904 and 0.866、0.885, respectively. The adsorption isotherms can be well fitted by Freundlich model and Langmuir model, with R² of 0.974、0.976 and 0.966、0.977, respectively. Our study also found that the copper adsorbance on PS increased with copper concentration but accompanying with a decrease of adsorption rate, while it decreased with PS concentration but adsorption rate increased. The coexisting ions promoted the copper adsorbance on PS. The findings could provide a theoretical basis for further research regarding heavy metals adsorbance on microplastics, their environmental behavior in marine environment, and influences on pollutants transport as well.

Key words： microplastics polystyrene (PS) sorption copper

Received: 10 April 2019

PACS:

X131

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	Articles by authors
	FU Dong-dong
	ZHANG Qiong-jie
	FAN Zheng-quan
	QI Huai-yuan
	WANG Ze-zheng
	PENG Li-cheng

Cite this article:

FU Dong-dong,ZHANG Qiong-jie,FAN Zheng-quan等. Adsorption characteristics of copper ions on polystyrene microplastics[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4769-4775.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I11/4769

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