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Year: 2014 Volume: 9 Issue: 3

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Critical evaluation of adsorption-desorption hysteresis of heavy metal ions from carbon nanotubes: influence of wall number and surface functionalization.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Li, Jie Chen, Changlun Zhang, Shouwei Ren, Xuemei Tan, Xiaoli Wang, Xiangke
Description	Author Affiliation: Li J ( Key Laboratory of Novel Thin Film Solar Cells, Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, 230031 Hefei (PR China).)
Abstract	Single-, double-, and multi-walled carbon nanotubes (SWCNTs, DWCNTs, and MWCNTs), and two oxidized MWCNTs with different oxygen contents (2.51âwt % and 3.5âwt %) were used to study the effect of the wall number and surface functionalization of CNTs on their adsorption capacity and adsorption-desorption hysteresis for heavy metal ions (Ni(II), Cd(II), and Pb(II)). Metal ions adsorbed on CNTs could be desorbed by lowering the solution pH. Adsoprtion of heavy metal ions was not completely reversible when the supernatant was replaced with metal ion-free electrolyte solution. With increasing wall number and amount of surface functional groups, CNTs had more surface defects and exhibited higher adsorption capacity and higher adsorption-desorption hysteresis index (HI) values. The coverage of heavy metal ions on the surface of CNTs, solution pH, and temperature affect the metal ion adsorption-desorption hysteresis. A possible shift in the adsorption mechanism from mainly irreversible to largely reversible processes may take place, as the amount of metal ions adsorbed on CNTs increases. Heavy metal ions may be irreversibly adsorbed on defect sites.
File Format	HTM / HTML
ISSN	18614728
Issue Number	4
Journal	Chemistry - An Asian Journal
Volume Number	9
e-ISSN	1861471X
Language	English
Publisher	Wiley-VCH
Publisher Date	2014-04-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry

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