Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 183, Issue 1-3, Pages 87-97Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2010.06.110
Keywords
Bentonite; Arquad (R) 2HT-75; Organoclay; Hexavalent chromium; Adsorption
Categories
Funding
- University of South Australia
- Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE)
- Centre for Environmental Risk Assessment and Remediation (CERAR), University of South Australia
Ask authors/readers for more resources
Unlike hydrophobic organic pollutants, the potential of organoclays to adsorb inorganic ionic contaminants is relatively underexplored. The present study attempts to characterise bentonite (QB) based organoclays synthesised from a commercially available, low-cost alkyl ammonium surfactant Arquad (R) 2HT-75 (Aq) and test their ability to adsorb hexavalent chromium (Cr (VI)) in aqueous solution. XRD, FTIR and TGA characterisation techniques prove successful modification of the bentonite structure and reveal that higher surfactant loadings gives rise to more ordered surfactant conformation in the organoclays. The zeta potential values indicate that higher surfactant loadings also create positive charges on the organoclay surfaces. Detailed isothermal and kinetic studies show that the organoclays effectively remove hexavalent chromium (Cr (VI)) from aqueous solution by both physical and chemical adsorption processes. Higher surfactant loadings provide better adsorption efficiency. The adsorption performance is reasonably efficient under the levels of pH, temperature, electrolyte concentration and natural organic matter concentration that generally prevail in contaminated soil and water. This study shows that organoclay sorbents offer good potential for remediating Cr (VI) under real environmental conditions. (C) 2010 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available