Adsorption characteristics of cadmium onto microplastics from aqueous solutions
文献类型：期刊论文
| 作者 | Wang, Fayuan2; Yang, Weiwei; Cheng, Peng; Zhang, Shuqi; Zhang, Shuwu2; Jiao, Wentao1; Sun, Yuhuan2 |
| 刊名 | CHEMOSPHERE
 |
| 出版日期 | 2019-11-01 |
| 卷号 | 235页码:1073-1080 |
| 关键词 | Microplastics Cadmium Adsorption Desorption Toxic metals |
| ISSN号 | 0045-6535 |
| 英文摘要 | As one of emerging contaminants, microplastics (MPs) can enter the environment and adsorb toxic metals such as cadmium (Cd), thereby causing potential environmental risks. However, adsorption characteristics of MPs are poorly understood. Herein, batch experiments were performed to investigate the adsorption characteristics of Cd onto high-density polyethylene (HDPE) MPs with different particle sizes, that is, 1-2 mm, 0.6-1 mm, and 100-154 mu m. The adsorption of Cd was quite rapid initially, and the equilibrium time was approximately 90 min. An increase in the pH of the Cd solution led to an increase in Cd adsorption. MPs with particle size of 100-154 mu m had the highest adsorption capacity. Addition of 1, 10, and 100 mg/L NaCl all significantly decreased Cd adsorption. Adsorption kinetics fitted the pseudo-second-order model. Adsorption isotherm followed the Langmuir model and, to a lesser extent, the Freundlich model, with estimated maximum adsorption capacity of 30.5 mu g/g. The adsorbed Cd easily desorbed from the MPs. Energy-dispersive X-ray spectroscopy (EDS) analysis confirmed Cd adsorption to and desorption from MPs. Fourier transform infrared (FTIR) spectroscopy analysis showed no new functional groups formed during the adsorption and desorption processes, suggesting physical interaction may dominate the Cd adsorption onto MPs. The present study findings provide evidence that MPs can accumulate Cd, and the adsorbed Cd may be highly available, thus posing risks to the organisms exposed to these MPs. (C) 2019 Elsevier Ltd. All rights reserved. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/42375]  |
| 专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
| 作者单位 | 1.Qingdao Univ Sci & Technol, Coll Environm & Safety Engn, Qingdao 266042, Shandong, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China 3.Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & Resource, Qingdao 266237, Shandong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Fayuan,Yang, Weiwei,Cheng, Peng,et al. Adsorption characteristics of cadmium onto microplastics from aqueous solutions[J]. CHEMOSPHERE,2019,235:1073-1080. |
| APA | Wang, Fayuan.,Yang, Weiwei.,Cheng, Peng.,Zhang, Shuqi.,Zhang, Shuwu.,...&Sun, Yuhuan.(2019).Adsorption characteristics of cadmium onto microplastics from aqueous solutions.CHEMOSPHERE,235,1073-1080. |
| MLA | Wang, Fayuan,et al."Adsorption characteristics of cadmium onto microplastics from aqueous solutions".CHEMOSPHERE 235(2019):1073-1080. |
入库方式： OAI收割
来源：生态环境研究中心
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