期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 439, 期 -, 页码 1-7出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2012.08.022
关键词
Sorption; Herbicides; Carbon nanotubes (CNTs); Hydrophobic interaction; Hydrogen bonding; Carbonaceous adsorbents
资金
- National Natural Science Foundation of China [40803029]
- Open Research Funds for China Institute of Water Resources and Hydropower Research [IWHRKF201007]
- Fundamental Research Funds for the Central Universities
The sorption behaviors of diuron (DIU), fluridone (FLU) and norflurazon (NOR) by a single-walled carbon nanotube (SWCNT) and three multi-walled carbon nanotubes (MWCNT) samples including MWCNT10 (<10 nm, outer diameter), MWCNT20 (10-20 nm), and MWCNT40 (20-40 nm) were investigated. All adsorption isotherms were nonlinear and were well fitted with the Freundlich model and Dubinin Ashtakhov (DA) model. The linear relationships between the organic carbon (OC)-normalized saturated adsorption capacity (Q(OC)(0)) and surface area (SA) suggest that SA is presumably responsible for the adsorption of DIU and NOR on CNTs. While FLU, DIU, and NOR OC-normalized distribution coefficients (logK(OC)) of CNTs increased with increasing their hydrophobicity (logK(OW)) and the positive relationships between the logK(OW)-normalized logK(OC) (i.e., logK(OC)/logK(OW)) of FW. DIU, and NOR and their hydrogen bonding ability indicate that the adsorption of FLU. DIU and NOR was mainly controlled by the hydrophobic interaction and hydrogen bonding. The higher logK(OC) or Q(OC)(0) values of MWCNT10 and SWCNT relative to other large MWCNTs and carbonaceous adsorbents suggest that MWCNT10 has the potential to serve as an adsorbent used to reduce the mobility of herbicides in agricultural and environmental applications. (C) 2012 Elsevier B.V. All rights reserved.
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