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Research Journals >
Indian Journal of Biotechnology (IJBT) >
IJBT Vol.10 [2011] >
IJBT Vol.10(1) [January 2011] >
| 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 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0967 (Online); 0972-5849 (Print) |
| Source: | IJBT Vol.10(1) [January 2011]
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