A new guar gum-based adsorbent for the removal of Hg(II) from its aqueous solutions
| Autor: | Shiwali Thakur, Sapana Kumari, Ghanshyam S. Chauhan, Priyanka Dogra |
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| Rok vydání: | 2014 |
| Předmět: |
Polymers and Plastics
Metal ions in aqueous solution Kinetics Inorganic chemistry Diamines Galactans Water Purification Mannans chemistry.chemical_compound Adsorption Plant Gums Materials Chemistry Epichlorohydrin Freundlich equation Schiff Bases Aqueous solution Guar gum Mercury Compounds Poisoning Organic Chemistry Temperature Hydrogen-Ion Concentration Heavy Metal Poisoning Cross-Linking Reagents chemistry Hexamethylenediamine Water Pollutants Chemical |
| Zdroj: | Carbohydrate Polymers. 106:276-282 |
| ISSN: | 0144-8617 |
| DOI: | 10.1016/j.carbpol.2014.02.041 |
| Popis: | Modification of biopolymers by oxidation is an easy process to develop effective adsorbents for the removal of toxic metal ions from their aqueous solutions. In the present study, guar gum (GG) was crosslinked with epichlorohydrin and then oxidized to the polydialdehyde form (GG- cl PDA). The latter was converted to a Schiff-base, GG- cl CH N (CH 2 ) 6 N CH GG, by reaction with hexamethylenediamine. Different forms of the modified GG were characterized by SEM, FTIR and XRD and investigated as adsorbents for the removal of Hg(II) ions from their aqueous solutions. The adsorption process was carried out through the variation of time, temperature, pH and initial concentration of Hg(II) ions. GG- cl CH N (CH 2 ) 6 N CH GG was observed to be an efficient adsorbent with a maximum adsorption capacity of 41.13 mg/g. It is reusable up to five cycles at the optimum conditions obtained for the maximum ions uptake. The kinetic data generated fit the Freundlich isotherm and pseudo-second order kinetics. |
| Databáze: | OpenAIRE |
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