ChitosanImmobilized Pumice for the Removal of As

Authors: Dilek Turan Cemre Kocahakimoğlu Ezel Boyacı Sait C Sofuoglu Ahmet E Eroğlu

Publish Date: 2014/04/11

Volume: 225, Issue: 5, Pages: 1931-

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Abstract

A novel sorbent chitosanimmobilized pumice has been prepared for the sorption of AsV from waters prior to its determination by hydride generation atomic absorption spectrometry The success of the immobilization has been checked with such characterization techniques as scanning electron microscopy thermal gravimetric analysis and elemental analysis Points of zero charge of the sorbents were determined with potentiometric mass titration Batchtype equilibration studies have shown that the novel sorbent can be employed at a wide pH range resulting in quantitative sorption 90  at pH 30–70 and greater than 70  sorption at pH 80 These results demonstrate the advantage of immobilizing chitosan onto pumice because under the same conditions pumice displays 20  sorption toward AsV whereas chitosan gives approximately 90  sorption only at pH 30 The validity of the method was verified through the analysis of ultrapure bottled drinking and tap water samples spiked with arsenate the respective sorption percentages of 932 ±07 890 ±10 and 809 ±13 were obtained by batchtype equilibration Arsenic sorption was also examined in the presence of common interfering ions resulting in competing effects of PO4 3− and NO3 − on AsV adsorptionThe authors thank the Center of Material Research for the facilities SEM and TGA Environmental Research Center for ICPMS analyses in preliminary studies at İzmir Institute of Technology Prof Dr Hürriyet Polat for particle size determination Dr Hüseyin Özgener for elemental analysis and Prof Dr Mehmet Kitis at Suleyman Demirel University Turkey for kindly providing the pumice samples are also acknowledged

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