Investigation onto feasibility of an adsorbent for chromium abatement with its extended application for real mine drainage water

Investigation onto feasibility of an adsorbent for chromium abatement with its extended application for real mine drainage water

The feasibilities of the adsorbents ferrous modified calcined bauxite (FEMCB) and ferric modified calcined bauxite (FRMCB) in the abatement of Cr(VI) was investigated in the present study. The adsorbents were characterized by scanning electron micrographs (SEM), electro diffraction spectra (EDS), X-...

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Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Vol. 48; no. 1; pp. 67 - 78
Main Authors: Perikamana, Krishnadas, Sasidharan Pillai, Indu M, Gupta, Ashok K, Sulaiman, Ayoob
Format: Journal Article
Language:English
Published: England Taylor & Francis Group 2013
Taylor & Francis Ltd
Subjects:
Adsorbents
Adsorption
Aluminum base alloys
calcined bauxite
Chromium
Chromium - chemistry
Drainage
drainage water
Fourier transform infrared spectroscopy
Fourier transforms
hexavalent chromium
isotherm
Isotherms
Kinetics
Microscopy, Electron, Scanning
Mine drainage
Models, Theoretical
Optimization
Roasting
Sorption
sorption isotherms
Spectroscopy, Fourier Transform Infrared
Temperature
Thermodynamics
X-Ray Diffraction
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Summary:The feasibilities of the adsorbents ferrous modified calcined bauxite (FEMCB) and ferric modified calcined bauxite (FRMCB) in the abatement of Cr(VI) was investigated in the present study. The adsorbents were characterized by scanning electron micrographs (SEM), electro diffraction spectra (EDS), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectra. Parameter optimization of both adsorbents was done and performance efficiencies in the removal of Cr(VI) were compared. Although pH and temperature seemed to have no significant role in the removal efficiency of FEMCB, sorption by FRMCB was found to be depending on both. The optimum pH and temperature was found to be 5 ± 0.2, and 30°C, respectively. At optimum conditions, both adsorbents demonstrated removal efficiencies of >99% for a concentration of 5 mg L⁻¹. Sorption of Cr(VI) by FEMCB followed Freundlich isotherm model, while that of FRMCB fitted well with Langmuir isotherm model. The isotherm parameters were optimized by minimizing the error functions. The kinetics of sorption by FEMCB followed a pseudo-second-order model confirming chemisorptive mechanism, while FRMCB followed pseudo-first-order. Thermodynamic study revealed that sorption process was spontaneous and that the rate limiting step was governed by film diffusion. Both the adsorbents showed removal efficiencies of >99% in removing Cr(VI) from real sample of mine drainage water of concentration 1.86 mg L⁻¹ at optimum conditions.
Bibliography:http://dx.doi.org/10.1080/10934529.2012.707847
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:1532-4117
1093-4529
1532-4117
DOI:10.1080/10934529.2012.707847