Mechanism analysis of heavy metal lead captured by natural-aged microplastics

被引：183
作者：
Fu, Qianmin [1 ,2 ]
Tan, Xiaofei [1 ,2 ]
Ye, Shujing [1 ,2 ]
Ma, Lili [3 ]
Gu, Yanling [4 ]
Zhang, Peng [1 ,2 ]
Chen, Qiang [1 ,2 ]
Yang, Yuanyuan [1 ,2 ]
Tang, Yuanqiang [1 ,2 ]
机构：
[1] HunanUniv, Coll Environm Sci & Engn, Changsha 410082, Peoples R China
[2] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Peoples R China
[3] Guilin Univ Technol, Coll Environm Sci & Engn, Guilin 541004, Peoples R China
[4] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China
来源：
CHEMOSPHERE | 2021年 / 270卷
基金：
中国国家自然科学基金;
关键词：
Natural-aged microplastics; Pb(II); Capture; Organic film; Interaction mechanism;
D O I：
10.1016/j.chemosphere.2020.128624
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this paper, the mechanism of lead (Pb(II)) captured by natural-aged microplastics in aqueous medium was explored. Compared with pristine microplastics, the natural-aged microplastics were more efficient for adsorbing Pb(II). After treated by hydrochloric acid (HCl) or sodium hydroxide (NaOH), the organic film was damaged and the adsorption efficiency decreased obviously, which proved that the organic film played an important role in Pb(II) capture. The fitting results of the isothermal adsorption model showed that this adsorption process was more in line with Langmuir model than with Freundlich model, and the maximum adsorption amount (13.60 mg/g) could also be obtained from the Langmuir model. Based on the comprehensive analysis of XRD, XPS and FTIR results, it was found that Pb(II) capture by natural-aged microplastics was mainly determined by the oxygen containing functional groups (carboxyl and hydroxyl groups) on the organic film. Besides, the measurement results of Zeta potential and pH effect showed that electrostatic interaction was mainly responsible for the Pb(II) capture process. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：9
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