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Sorption of Chromium(VI) from Aqueous Solution by Cassava ( Manihot sculenta C ranz .) Waste Biomass
Author(s) -
Horsfall Michael,
Ogban Fred,
Akporhonor Eyitemi Emmanuel
Publication year - 2006
Publication title -
chemistry and biodiversity
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 70
eISSN - 1612-1880
pISSN - 1612-1872
DOI - 10.1002/cbdv.200690019
Subject(s) - sorption , chemistry , adsorption , sorbent , biomass (ecology) , freundlich equation , aqueous solution , langmuir , chromium , physisorption , exothermic reaction , langmuir adsorption model , nuclear chemistry , kinetics , chemical engineering , organic chemistry , agronomy , physics , quantum mechanics , biology , engineering
The sorption of highly toxic Cr VI ions by cassava waste biomass was quantitatively investigated. The sorption was found to be influenced by several physico‐chemical factors such as agitation speed, temperature, contact time, pH, and sorbent/sorbate ratio. The adsorption data at equilibrium were fitted to Freundlich and Langmuir isotherms. The monolayer sorption capacity was found to be 61.79 mg of Cr VI per gram of biomass. The kinetics of Cr VI adsorption to pure cassava‐tuber‐bark wastes were determined based on a pseudo‐second‐order‐rate model using the batch‐sorption technique at a temperature of 30°. The kinetics data suggest that the adsorption process is exothermic, and that the rate‐limiting step is physisorption. Negative Δ G ads values indicate that the adsorption is spontaneous and exothermic in nature. Also, under optimal conditions (in agitated 1 M H 2 SO 4 at 30°), the cassava waste biomass appears to be recyclable.