• 文献标题:   The aggregation behaviour and mechanism of commercial graphene oxide in surface aquatic environments
  • 文献类型:   Article
  • 作  者:   GAO Y, ZENG X, ZHANG W, ZHOU LA, XUE WJ, TANG MY, SUN SQ
  • 作者关键词:   commercial graphene oxide, xiangjiang river, complex cationic condition, aggregation mechanism
  • 出版物名称:   SCIENCE OF THE TOTAL ENVIRONMENT
  • ISSN:   0048-9697 EI 1879-1026
  • 通讯作者地址:  
  • 被引频次:   10
  • DOI:   10.1016/j.scitotenv.2021.150942 EA NOV 2021
  • 出版年:   2022

▎ 摘  要

In this study, we comprehensively and critically discuss the aggregation mechanism of commercial graphene oxide (CGO) in surface aquatic environments. The aggregation kinetics and critical coagulation concentration of CGO were obtained through time-resolved dynamic light scattering and batch techniques over a wide range of water types. By employing transmission electron microscopy and elemental mapping, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy, we studied the effects of cations in natural waters on the microstructure transformation, element content and distribution, and oxygen-containing functional group vibrations of CGO. The aggregation of CGO in natural water is induced mainly by Ca2+ by complexing; Na+, with a higher concentration, plays a more important role than Mg2+ in inducing aggregation via electric double layer suppression. Ca2+ mainly interacts with C - COOH, while Mg2+ has a greater effect on C - OH.Na+ has less effect on the oxygen-containing functional group but decreases the C/O ratio in contrast with Mg2+/Ca2+/natural water, indicating the different inducing mechanisms. This study looks forward to providing pivotal knowledge to predict the environmental fate of CGO more accurately in natural surface water. (C) 2021 Elsevier B.V. All rights reserved.