期刊
ENVIRONMENTAL POLLUTION
卷 157, 期 4, 页码 1095-1100出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2008.11.007
关键词
Carbon nanotubes; Fulvic acid; Adsorption; Surface area; pH
资金
- National Science Foundation of China [20777065, 20737002, 40503015]
- Natural Science Foundation of Zhejiang Province [Y506056]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars
- Massachusetts Agricultural Experiment Station [MAS860]
- Massachusetts Water Resources Research Center [2007MA73B]
This study investigated adsorption of fulvic acid (FA) by single-walled (SWCNT) and multi-walled carbon nanotubes (MWCNT) and activated carbon. Adsorption of FA depends greatly on the adsorbent surface area and solution pH. SWCNT has higher adsorption than MWCNT and activated carbon, Lower E4/E6 (absorbance at 465 nm to that at 665 nm) and higher E2/E3 (absorbance at 250 nm to that at 365 nm) ratios of the residual FA in solution after adsorption than that of original FA in low pH ranges suggest that aromatic rich FA fractions with polar moieties readily adsorb on the adsorbents, The apparent interaction mechanisms between FA and CNT surfaces include electrostatic, hydrophobic, pi-pi and hydrogen-bond interactions. FA adsorption was reduced greatly with increasing pH because of the increase of electrostatic repulsion and the decrease of hydrophobic and hydrogen-bond interactions. (C) 2008 Elsevier Ltd. All rights reserved.
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