Selenium removal from drinking water by adsorption to chitosan-clay composites and oxides: Batch and columns tests

Nimrod Bleiman, Yael G. Mishael*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

213 Scopus citations

Abstract

Polymer-clay composites were designed to adsorb selenium from water. The highest adsorption efficiency was obtained for chitosan-montmorillonite composites. These composites were characterized by XRD, zeta potential, and FTIR measurements. Adsorption isotherms of selenate on the composite, on Al-oxide and on Fe-oxide were in good agreement with the Langmuir model, yielding a somewhat higher capacity for the composite, 18.4, 17.2 and 8.2. mg/g, respectively. In addition, adsorption by the composite was not pH dependent while its adsorption by the oxides decreased at high pH. Selenium removal from well water (closed due to high selenium concentrations, 0.1. mg/L) by the composite, brought levels to below the WHO limit (0.01. mg/L) and was selective for selenium even in the presence of sulfur (13. mg/L). Selenium adsorption by the composite was higher than by the Al-oxide due to high adsorption of sulfur by the later. Unlike employment in batch Al-oxide is more suitable for employment in filtration columns due to its high hydraulic conductivity. A semi-pilot columns experiment demonstrated selenium removal from the well water below the recommended limit (first 400 pore volumes) by Al-oxide columns. Regeneration of Al-oxide and of the composite was studied and readsorption of selenium was demonstrated.

Original languageAmerican English
Pages (from-to)590-595
Number of pages6
JournalJournal of Hazardous Materials
Volume183
Issue number1-3
DOIs
StatePublished - Nov 2010

Bibliographical note

Funding Information:
This research was supported by The Katamon Grant for water technologies from the Israeli Ministry of Industry, Trade and Labor .

Keywords

  • Adsorption
  • Aluminum oxides
  • Chitosan-clay composites
  • Selenium
  • Water treatment

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