| Literature DB >> 28684353 |
Ronghua Li1, Wen Liang2, Manlin Li3, Shuncheng Jiang2, Hui Huang4, Zengqiang Zhang2, Jim J Wang4, Mukesh Kumar Awasthi2.
Abstract
A highly cross-linked Thiocarbohydrazide-modified chitosan (TCCS) gel was synthesized by using formaldehyde as linkage, and was used in removal of Cd(II) and Cr(VI) from aqueous solution. The results showed that TCCS could be used in a wider pH range and had higher adsorption abilities than raw chitosan for Cd(II) and Cr(VI) ions. The maximum adsorption capacities of the synthetic TCCS for two ions reached 81.26 and 144.68mg/g at 298K, respectively. The endothermic adsorption exhibited pseudo-second-order kinetic behavior and the adsorption isotherm could be well described by Langmuir model. The Cd(II) ion adsorption mechanism was dominated by a complexation reaction process, while the Cr(VI) adsorption was governed by a multiple mechanism including electrostatic attraction, reduction and complexation process. TCCS was easy to be regenerated and had great reusability potential in Cd(II) and Cr(VI) ions capture from aqueous solution.Entities:
Keywords: Adsorption; Cd(II) and Cr(VI); Chitosan hydrogel; Thiocarbohydrazide
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Year: 2017 PMID： 28684353 DOI： 10.1016/j.ijbiomac.2017.07.005
Source DB: PubMed Journal: Int J Biol Macromol ISSN： 0141-8130 Impact factor: 6.953