Removal of hexavalent chromium using coffee husk | Zendy

N. Ahalya | Zendy; R D Kanamadi | Zendy; T. V. Ramachandra | Zendy

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Removal of hexavalent chromium using coffee husk

Author(s) -

N. Ahalya,

R D Kanamadi,

T. V. Ramachandra

Publication year - 2010

Publication title -

international journal of environment and pollution

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.167

H-Index - 46

eISSN - 1741-5101

pISSN - 0957-4352

DOI - 10.1504/ijep.2010.035917

Subject(s) - biosorption , hexavalent chromium , freundlich equation , husk , adsorption , langmuir , chromium , chemistry , nuclear chemistry , desorption , aqueous solution , langmuir adsorption model , sorption , organic chemistry , botany , biology

The potential to remove chromium(VI) from aqueous solutions through biosorption using coffee husk was investigated. The effects of pH, contact time, initial concentration and adsorbent dosage on the adsorption of Cr(VI) were studied. The data obeyed Langmuir and Freundlich adsorption isotherms. The Langmuir adsorption capacity was found to be 44.95 mg/g. The Freundlich constants Kf and n were 1.027 (mg/g (l/mg) n ) and 1.493, respectively. Desorption studies indicated the removal of 60% of the hexavalent chromium. Infrared spectral studies revealed the presence of functional groups, such as hydroxyl and carboxyl groups, on the surface of the biomass, which facilitates biosorption of Cr(VI).

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