Removal of Cd(II) and Cr(VI) ions by highly cross-linked Thiocarbohydrazide-chitosan gel
| Autor: | Zengqiang Zhang, Jim J. Wang, Wen Liang, Mukesh Kumar Awasthi, Manlin Li, Shuncheng Jiang, Ronghua Li, Hui Huang |
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| Rok vydání: | 2017 |
| Předmět: |
Chromium
Inorganic chemistry Formaldehyde 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry Endothermic process Water Purification Ion Chitosan chemistry.chemical_compound symbols.namesake Adsorption Structural Biology Molecular Biology Thiocarbohydrazide Aqueous solution Temperature Langmuir adsorption model General Medicine Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology 0104 chemical sciences Kinetics Hydrazines chemistry symbols 0210 nano-technology Gels Water Pollutants Chemical Cadmium |
| Zdroj: | International Journal of Biological Macromolecules. 104:1072-1081 |
| ISSN: | 0141-8130 |
| DOI: | 10.1016/j.ijbiomac.2017.07.005 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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