期刊
CHEMICAL ENGINEERING JOURNAL
卷 300, 期 -, 页码 306-316出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.04.084
关键词
Starch/SnO2 nanocomposite; Adsorption; Toxic metal ion; Kinetics; Regeneration
资金
- Deanship of Scientific Research at King Saud University through the Research Group [RG-1436-034]
In this study, starch based nanocomposite (starch/SnO2) was synthesized and used as an effective adsorbent for the removal of Hg2+ from aqueous medium. The as-prepared starch/SnO2 nanocomposite was characterized by means of the XPS, XRD, BET, FTIR, SEM and TEM analyses. The effects of contact time, pH, initial Hg2+ concentration and temperature on the adsorption performance of starch/SnO2 nanocomposite were investigated thoroughly. The experimental results showed that starch/SnO2 nanocomposite had high ability to remove Hg2+ ion from aqueous medium. The adsorption of Hg2+ was maximum at the pH 6 and equilibrium was achieved within 60 min. The pseudo-second-order equation represented the adsorption kinetics with high correlation coefficient (>0.998) and the Freundlich isotherm model fitted the adsorption data better than the Langmuir. The maximum adsorption capacity was found to be 192 mg g(-1) at 25 degrees C which was increased with the temperature, indicated the endothermic adsorption. The feasibility of Hg2+ adsorption onto starch/SnO2 nanocomposite was also studied thermodynamically and the results showed that the adsorption was spontaneous and chemical in nature. The adsorption capacity of the regenerated adsorbents could still be maintained at 94% by the fourth adsorption-desorption cycle. (C) 2016 Elsevier B.V. All rights reserved.
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