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Title: Bioremediation of industrial toxic metals with gum kondagogu (<i>Cochlospermum gossypium</i>): A natural carbohydrate biopolymer
Authors: Vinod, V T P
Sashidhar, R B
Keywords: Adsorption
<i style="">Cochlospermom gossypium</i>
gum kondagogu
Issue Date: Jan-2011
Publisher: NISCAIR-CSIR, India
Abstract: The ability of gum kondagogu [<i>Cochlospermum gossypium </i>(L.) DC.], a natural carbohydrate biopolymer, was investigated for adsorptive removal of toxic metal ions Cd<sup>2+</sup>, Cu<sup>2+</sup>, Fe<sup>2+</sup>, Pb<sup>2+</sup>, Ni<sup>2+</sup>, Zn<sup>2+</sup>, Hg<sup>2+</sup> and total Cr present in industrial effluents. Various physico-chemical parameters, such as, <i style="">p</i>H, 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, Cd<sup>2+</sup> > Cu<sup>2+</sup> > Fe<sup>2+</sup> > Pb<sup>2+</sup> > Hg<sup>2+</sup> > total Cr<sup> </sup>> Ni<sup>2+</sup> > Zn<sup>2+</sup>. The maximum adsorption capacity of metals by gum kondagogu varied in the range of 31-37 mg g<sup>-1</sup> for Fe<sup>2+</sup> and minimum of 5.5-9.3 mg g<sup>-1</sup> for Hg<sup>2+</sup> 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.
Description: 113-120
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Appears in Collections:IJBT Vol.10(1) [January 2011]

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