Efficiency of Fe-montmorillonite on the removal of Rhodamine B and hexavalent chromium from aqueous solution

Ma, Lingya, Xi, Yunfei, He, Hongping, Ayoko, Godwin A., Zhu, Runliang, & Zhu, Jianxi (2016) Efficiency of Fe-montmorillonite on the removal of Rhodamine B and hexavalent chromium from aqueous solution. Applied Clay Science, 120, pp. 9-15.

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Abstract

Fe-montmorillonite (Fe-Mt) was prepared and tested for its potential application in the simultaneous removal of hexavalent chromium (Cr(VI)) and rhodamine B (RhB) from aqueous solution. The adsorption kinetics and capacities of Fe-Mt toward Cr(VI) and RhB were determined in relation to the initial contaminant concentration, pH of the solution and concentration of coexist contaminant. The adsorption kinetics of Cr(VI) or/and RhB in both single and simultaneous systems were investigated, which showed that an equilibrium time of a few hours was needed for the adsorption of Cr(VI) and RhB on Fe-Mt. The pseudo-second order model offers a better fit than pseudo-first order model for the Cr(VI) and RhB adsorption. Compared with the single adsorption systems, adsorption rates and quantities of Cr(VI) and RhB adsorbed on Fe-Mt were slightly enhanced in the simultaneous adsorption system. The most effective pH range for the removal of Cr(VI) and RhB was found to be 3.0–4.0. Cr(VI) adsorption isotherms were best represented by the two-site Langmuir model while RhB isotherms followed the Freundlich model. For both contaminants, the adsorption of one contaminant increases with increase in the initial concentration of the other one. Therefore, Fe-Mt could simultaneously remove Cr(VI) and RhB from water. The properties of Fe-Mt were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and thermogravimetric analysis (TG). The findings of this study provide novel information for the development of clay-based adsorbents toward dyes and heavy metals.

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ID Code: 98377
Item Type: Journal Article
Refereed: Yes
Keywords: Simultaneous adsorption, Fe-montmorillonite, Hexavalent chromium, Rhodamine B
DOI: 10.1016/j.clay.2015.11.010
ISSN: 0169-1317
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000)
Divisions: Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
  • QUT/Vice Chancellor's research grant
  • CAS-SAFEA/20140491534
  • CAS/2014324
  • CSC/No ID
Facilities: Central Analytical Research Facility
Copyright Owner: Copyright 2016 Elsevier
Copyright Statement: Licensed under the Creative Commons Attribution; Non-Commercial; No-Derivatives 4.0 International. DOI 10.1016/j.clay.2015.11.010
Deposited On: 25 Aug 2016 04:04
Last Modified: 29 Aug 2016 16:13

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