Sorption of cadmium from aqueous solution by surfactant-modified carbon adsorbents
Sorption capacities for cadmium, Cd(II) on indigenously prepared, steam activated, untreated, surfactant-modified carbon powder, from husk and pods of Moringa oleifera were investigated. The optimized conditions for all the experimental runs were pH 8.0 ± 0.2, temperature 30 ± 0.5 °C, contact tim...
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| Main Authors: | , , , , |
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| Format: | Citation Index Journal |
| Published: |
2009
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| Online Access: | http://eprints.utp.edu.my/2861/1/Sorption-of-cadmium-from-aqueous-solution-by-surfactant-modified-carbon-adsorbents_2009_Chemical-Engineering-Journal.pdf http://www.scopus.com/inward/record.url?eid=2-s2.0-61849132327&partnerID=40&md5=0615f4d31a208da6b03e071143c1c66a http://eprints.utp.edu.my/2861/ |
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| Summary: | Sorption capacities for cadmium, Cd(II) on indigenously prepared, steam activated, untreated, surfactant-modified carbon powder, from husk and pods of Moringa oleifera were investigated. The optimized conditions for all the experimental runs were pH 8.0 ± 0.2, temperature 30 ± 0.5 °C, contact time 120 min, agitation speed 160 rpm, initial metal concentration 30 mg L<sup>-1</sup> and adsorbent dosage 1.0 g L<sup>-1</sup>, respectively. Maximum Cd(II) removal, 98.0% was observed when cetyltrimethyl ammonium bromide (CTAB), cationic surfactant-treated carbon was used as an adsorbent. The Cd(II) removal percentages for sodium dodecyl sulphate (SDS), anionic surfactant, Triton X-100 (non-ionic surfactant) treated and untreated powder activated carbons were found to be 95.60, 81.50 and 73.36%, respectively. SEM images and BET surface area, porosity and pore volume measurements have revealed that surfactant-treated carbons have superior porosity and enhanced surface area than untreated carbons. The sorption data were correlated better with the Langmuir adsorption isotherm than Freundlich isotherm with R<sup>2</sup> values ranging from 0.91 to 0.98. © 2008 Elsevier B.V. All rights reserved.
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