Sorption and desorption studies of chromium(VI) from nonviable cyanobacterium Nostoc muscorum biomass
DOI: 10.1016/j.jhazmat.2007.10.032
Title: Sorption and desorption studies of chromium(VI) from nonviable cyanobacterium Nostoc muscorum biomass
Journal Title: Journal of Hazardous Materials
Volume: 154
Publication Date: 15 June 2008
Start Page: 347
End Page: 354
Published online: online 13 October 2007
ISSN: 0304-3894
Author: V.K. Gupta, A. Rastogi
Affiliations:
  • Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
  • Abstract: munication presents results pertaining to the sorptive and desorptive studies carried out on chromium(VI) removal onto nonviable freshwater cyanobacterium (Nostoc muscorum) biomass. Influence of varying the conditions for removal of chromium(VI), such as the pH of aqueous solution, the dosage of biosorbent, the contact time with the biosorbent, the temperature for the removal of chromium, the effect of light metal ions and the adSorption–deSorption studies were investigated. Sorption interaction of chromium on to cyanobacterial species obeyed both the first and the second-order rate equation and the experimental data showed good fit with both the Langmuir and freundlich adSorption isotherm models. The maximum adSorption capacity was 22.92 mg/g at 25 °C and pH 3.0. The adSorption process was endothermic and the values of thermodynamic parameters of the process were calculated. Various properties of the cyanobacterium, as adsorbent, explored in the characterization part were chemical composition of the adsorbent, surface area calculation by BET method and surface functionality by FTIR. Sorption–deSorption of chromium into inorganic solutions and distilled water were observed and this indicated the biosorbent could be regenerated using 0.1 M HNO3 and EDTA with upto 80% recovery. The biosorbents were reused in five bioSorption–deSorption cycles without a significant loss in bioSorption capacity. Thus, this study demonstrated that the cyanobacterial biomass N. muscorum could be used as an efficient biosorbent for the treatment of chromium(VI) bearing wastewater.
    Accepted: 10 October 2007
    Received: 14 September 2007
    Revised: 10 October 2007
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    Fax: +91 1332 273560
    Email: vinodfcy@iitr.ernet.in

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