Tin(IV) cross-linked chitosan for the removal of As(III)

Anita Shekhawat; Shashikant Kahu; D Saravanan; Ravin Jugade

doi:10.1016/j.carbpol.2017.05.038

Tin(IV) cross-linked chitosan for the removal of As(III)

Carbohydr Polym. 2017 Sep 15:172:205-212. doi: 10.1016/j.carbpol.2017.05.038. Epub 2017 May 20.

Authors

Anita Shekhawat¹, Shashikant Kahu¹, D Saravanan², Ravin Jugade³

Affiliations

¹ Department of Chemistry, R.T.M. Nagpur University, Nagpur-440033, India.
² Department of Chemistry, National College, Tiruchirappalli-620001, India.
³ Department of Chemistry, R.T.M. Nagpur University, Nagpur-440033, India. Electronic address: ravinj2001@yahoo.co.in.

PMID: 28606527
DOI: 10.1016/j.carbpol.2017.05.038

Abstract

Chitosan, a potent amino polysaccharide, has been cross-linked with Sn(IV) chloride. The material was thoroughly characterized using FT-IR, XRD, SEM, EDX, TGA-DTA and BET studies. This Sn(IV) chloride cross-linked chitosan (Sn-Ch) has been exploited for As(III) adsorption. Various parameters like pH, amount of adsorbent, adsorption time etc have been optimized to achieve maximum adsorption efficiency. Under optimum conditions of pH 7.0±0.2, adsorption time of 45min and adsorbent dose 200mg, Sn-Ch was found to have adsorption capacity of 17.10mg/g at 298K. Adsorption of As(III) by Sn-Ch follow non-linear Freundlich isotherm model. The equilibrium studies showed that the experimental data fits well with non-linear pseudo-second-order kinetic model. Adsorption process was found to be exothermic and spontaneous. Column study proves the applicability of Sn-Ch to the larger sample volumes. It was found to be recyclable material and could be regenerated and reused multiple times adding a greener dimension.

Keywords: Adsorption; As(III); Stannic chloride crosslinked chitosan.