Journal
CHEMICAL SPECIATION AND BIOAVAILABILITY
Volume 29, Issue 1, Pages 161-169Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09542299.2017.1378596
Keywords
Cabon nanotubes; functionalized MWCNTs; Hg2+; methylmercury; adsorption
Funding
- National Key R&D Program of China [2016YFA0203102]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB14020101]
- National Natural Science Foundation of China [21621064]
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Adsorption of Hg2+ and methylmercury (MeHg) to multi-walled carbon nanotubes (MWCNTs) modified, respectively, with hydroxyl, amine and carboxyl groups was studied. The effect of various factors like the initial pH, natural organic matter (NOM), Cl-and adsorbent dose on the sorption efficiency were evaluated. It was found that amine-modified MWCNTs showed a strong adsorption capacity to Hg2+ and MeHg, and the removal efficiency could reach up to 92% (0.5 g/L MWCNTs, and 100 mu g/L Hg2+ and MeHg) which is independent of pH. NOM had complex effects on the adsorption of Hg2+ and MeHg to MWCNTs. Cl-inhibited the adsorption of Hg2+ and MeHg to MWCNTs. The adsorption of Hg2+ and MeHg was found to be inhomogeneous and homogeneous chemisorption, respectively. Our results suggested that MWCNTs modified with different functional groups can efficiently adsorb both Hg2+ and MeHg in aqueous environment.
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