期刊
ENVIRONMENTAL POLLUTION
卷 204, 期 -, 页码 191-198出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2015.04.029
关键词
Engineered nanoparticles; Ionic organic contaminants; Mineral particles; Organo-mineral complex; Pharmaceuticals
资金
- National Natural Scientific Foundation of China [41222025, 41273138, 41361086]
- Recruitment Program of Highly-Qualified Scholars in Yunnan [2010CI109]
- USDA NIFA Hatch Program [00475]
Sorption of organic contaminants on organo-mineral complexes has been investigated extensively, but the sorption contribution of mineral particles was not properly addressed before calculating K-OC, especially for ionic organic contaminants. We measured the surface coverage of a humic acid (HA) on nano iron oxides (n-Fe2O3) in a series of synthesized organo-mineral complexes. The contribution of the coated HA to ofloxacin (OFL) and norfloxacin (NOR) sorption in HA n-Fe2O3 complexes was over 80% of the total sorption with the surface coverage of 36% and foc of 1.6%. All the coated HA showed higher sorption to NOR and OFL in comparison to the original HA, suggesting HA fractionation and/or physical re-conformation during organo-mineral complex formation. The decreased K-OC with multilayer coating may suggest the importance of site-specific interactions for OFL sorption, while the increased K-OC with multilayer coating may suggest the importance of partitioning in hydrophobic region for NOR sorption. (C) 2015 Elsevier Ltd. All rights reserved.
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