Aquatic environment

Adsorption of atrazine by natural organic matter and surfactant dispersedcarbon nanotubes

Baoyou Shi , Xiaoyan Zhuang , Xiaomin Yan , Jiajuan Lu , Hongxiao Tang


Received October 10, 2009,Revised December 21, 2009, Accepted , Available online

Volume 22,2010,Pages 1195-1202

  • Summary
  • References
  • Related Articles
The aggregation and dispersion behaviors of carbon nanotubes (CNTs) can regulate the environmental spread and fate of CNTs, as well as the organic pollutants adsorbed onto them. In this study, multi-walled carbon nanotubes (MWNTs) and single-walled carbon nanotubes (SWNTs) were surface modified with humic acids from di erent sources and with surfactants of di erent ionic types. The dispersion stability of surface modified CNTs was observed by UV-Vis spectrophotometry. The e ect of humic acid and surfactant dispersion on the adsorption of atrazine by CNTs was investigated by batch equilibrium experiments. Both humic acid and surfactant could e ectively disperse MWNTs, but not SWNTs, into stable suspensions under the studied conditions. Surface modified CNTs had a greatly reduced capacity for adsorption of atrazine. The inhibitory e ect of peat humic acid was relatively stronger than that of soil humic acid, but the two surfactants had a similar inhibitory e ect on atrazine adsorption by the two CNT types. Increases in surfactant concentration resulted in rapid decreases in the adsorption of atrazine by CNTs when the surfactant concentration was less than 0.5 critical micelle concentration.

Copyright © Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.京ICP备05002858号-3