Heteroaggregation of different surface-modified polystyrene nanoparticles with model natural colloids
文献类型：期刊论文
| 作者 | Yu, Su-juan; Li, Qing-cun; Shan, Wan-yu; Hao, Zhi-neng ; Li, Peng; Liu, Jing-fu
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| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
 |
| 出版日期 | 2021-08-25 |
| 卷号 | 784页码:- |
| 关键词 | Nanoplastics Hematite Kaolin Heteroaggregation Suwannee River natural organic matter |
| ISSN号 | 0048-9697 |
| 英文摘要 | This study investigated heteroaggregation of three surface-functionalized polystyrene nanoparticles (PSNPs), i.e. negatively charged unfunctionalized nanoparticles (Bare-PS) and carboxylated nanoparticles (COOH-PS), and positively charged amino-functionalized nanoparticles (NH2-PS), with two model natural colloids, positively charged hematite and negatively charged kaolin, respectively. Heteroaggregation was conducted at a constant natural colloid concentration and variable NP/colloid concentration ratios. Electrostatic interaction was the main mechanism driving the formation of heteroaggregates. In binary systems containing hematite and Bare-PS/COOH-PS, a charge neutralization - charge inverse mechanism was observed with the increase of PSNP concentration. At NP/hemetite concentration ratios much smaller or larger than the full charge neutralization point, the primary heteroaggregates were stable, while full charge neutralization induced the formation of large secondary heteroaggregates. Large aggregates were not observed in suspensions containing kaolin and NH2-PS, as highly positively charged NH2-PS reversed surface charges of kaolin at extremely low concentrations. Heteroaggregation between PSNPs and natural colloids with the same charge is unfavorable due to strong electrostatic repulsion. In the presence of electrolytes, homoaggregation and heteroaggregation both occurred, and homoaggregation of hematite played a key role when the concentration of PSNPs was low. The presence of Suwannee River natural organic matter (SRNOM) could modify surface charges of nanoparticles, and thus affect heteroaggregation behaviors of the binary suspension. When SRNOM and electrolytes were both present, whether SRNO Minducing or hindering the stability of the binary system was a combined effect ofNP/colloid concentration ratios, SRNOM concentrations, electrolyte types and ionic strength. Mechanisms extensively reported in homoaggregation such as steric hindrance and cation bridging effects between SRNOM and Ca2+ also stand for heteroaggregation. These results highlight the critical role of surface modification on the environmental behaviors of NPs, and will underpin our understanding of the fate and transport of NPs in the aquatic environment. (C) 2021 Elsevier B.V. All rights reserved. |
| WOS研究方向 | Environmental Sciences |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45740]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, POB 2871, Beijing 100085, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, Su-juan,Li, Qing-cun,Shan, Wan-yu,et al. Heteroaggregation of different surface-modified polystyrene nanoparticles with model natural colloids[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,784:-. |
| APA | Yu, Su-juan,Li, Qing-cun,Shan, Wan-yu,Hao, Zhi-neng,Li, Peng,&Liu, Jing-fu.(2021).Heteroaggregation of different surface-modified polystyrene nanoparticles with model natural colloids.SCIENCE OF THE TOTAL ENVIRONMENT,784,-. |
| MLA | Yu, Su-juan,et al."Heteroaggregation of different surface-modified polystyrene nanoparticles with model natural colloids".SCIENCE OF THE TOTAL ENVIRONMENT 784(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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