Removal of bisphenol A from wastewater by Ca-montmorillonite modified with selected surfactants

Zheng, Shuilin, Sun, Zhiming, Park, Yuri, Ayoko, Godwin A., & Frost, Ray L. (2013) Removal of bisphenol A from wastewater by Ca-montmorillonite modified with selected surfactants. Chemical Engineering Journal, 234, pp. 416-422.

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Abstract

Organo Arizona SAz-2 Ca-montmorillonite was prepared with different surfactant (DDTMA and HDTMA) loadings through direct ion exchange. The structural properties of the prepared organoclays were characterized by XRD and BET instruments. Batch experiments were carried out on the adsorption of bisphenol A (BPA) under different experimental conditions of pH and temperature to determine the optimum adsorption conditions. The hydrophobic phase and positively charged surface created by the loaded surfactant molecules are responsible for the adsorption of BPA. The adsorption of BPA onto organoclays is well described by pseudo-second order kinetic model and the Langmuir isotherm. The maximum adsorption capacity of the organoclays for BPA obtained from a Langmuir isotherm was 151.52 mg/g at 297 K. This value is among the highest values for BPA adsorption compared with other adsorbents. In addition, the adsorption process was spontaneous and exothermic based on the adsorption thermodynamics study. The organoclays intercalated with longer chain surfactant molecules possessed a greater adsorption capacity for BPA even under alkaline conditions. This process provides a pathway for the removal of BPA from contaminated waters.

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ID Code: 64409
Item Type: Journal Article
Refereed: Yes
Keywords: Adsorption, BPA, Organoclays, Ca-montmorillonite, Environmental remediation
DOI: 10.1016/j.cej.2013.08.115
ISSN: 13858947
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 Elsevier B.V.
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Chemical Engineering Journal. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chemical Engineering Journal, [Volume 234, (December 2013)] DOI: 10.1016/j.cej.2013.08.115
Deposited On: 12 Nov 2013 23:27
Last Modified: 05 Dec 2015 18:28

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