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Title: Bioremediation of industrial toxic metals with gum kondagogu (Cochlospermum gossypium): A natural carbohydrate biopolymer
Authors: Vinod, V T P
Sashidhar, R B
Keywords: Adsorption;biosorption;Cochlospermom gossypium;desorption;regeneration;FT-IR;ICP-MS;SEM-EDXA;gum kondagogu
Issue Date: Jan-2011
Publisher: NISCAIR-CSIR, India
Abstract: The ability of gum kondagogu [Cochlospermum gossypium (L.) DC.], a natural carbohydrate biopolymer, was investigated for adsorptive removal of toxic metal ions Cd2+, Cu2+, Fe2+, Pb2+, Ni2+, Zn2+, Hg2+ and total Cr present in industrial effluents. Various physico-chemical parameters, such as, pH, temperature, equilibrium contact time, % biosorption and adsorption capacity, were investigated. Metal biosorption (%) and adsorption capacity of the biopolymer was determined by ICP-MS. Gum kondagogu was capable of competitively biosorb 8 toxic metal ions from the samples of industrial effluents tested. The adsorption capacity was observed to be in the following order, Cd2+ > Cu2+ > Fe2+ > Pb2+ > Hg2+ > total Cr > Ni2+ > Zn2+. The maximum adsorption capacity of metals by gum kondagogu varied in the range of 31-37 mg g-1 for Fe2+ and minimum of 5.5-9.3 mg g-1 for Hg2+ in the effluent samples tested. The equilibrium adsorption data were fitted to Langmuir isotherm models for all the metal ions adsorbed. FT-IR studies were carried out to understand the type of functional groups in gum kondagogu responsible for metal biosorption process. Desorption studies on biosorbed metal ions showed that HCl was a good eluant for all metals tested. The re-adsorption capacity of the recycled gum kondagogu biopolymer sustained its biosorption property at 90% level, even after 3 cycle of desorption. Gum kondagogu biopolymer has the potential to be used as an effective, non-toxic, economical and an efficient biosorbent clean-up matrix for removal of toxic metals from industrial effluents.
Page(s): 113-120
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Appears in Collections:IJBT Vol.10(1) [January 2011]

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