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Title: Bioremediation of toxic metal ions using biomass of Aspergillus fumigatus from fermentative waste
Authors: Rao, K Rama
Rashmi, K
Latha, J Naveena Lavanya
Mohan, P Maruthi
Keywords: Aspergillus fumigatus
binding capacity
Issue Date: Jan-2005
Publisher: CSIR
IPC CodeInt. Cl.7 C 12 N 1/04, 1/24
Abstract: Dried, nonliving, granulated biomass of Aspergillus fumigatus from fermentation industry was used for the removal of Cd2+, Co2+, Cu2+ and Ni2+ from solutions. Sorption studies showed sequestration (70-90%) of Cd2+ from solutions (0.1-4 mM). However, with increase in concentration, Cd2+ sorption efficiency decreased due to saturation of the biosorbent. Cu2+ binds most efficiently (72%) to the biosorbent followed by Cd2+ (61%), Co2+ (49%) and Ni2+ (37%). Metal removal from solutions containing a mixture of metal ions (Cd2+, Cu2+, Co2+, and Ni2+), which reflects the features of the polluted wastewaters and industrial effluents, was also efficient (90%) at lower concentrations (0.1 mM each). At higher concentrations (5 mM to 25 mM), Cu2+ removal was predominant (>70%) over other ions. The biosorbent was reusuable up to 5 cycles with a 50% loss of initial Cd2+ binding capacity. However, a significant loss of Cd2+ binding capacity was observed when biosorbent was immobilized in polyvinyl foam. Infrared spectra of the biosorbent preparation showed the involvement of alcohol/amine (OH/NH2) and CH-OH functional groups in metal binding. The present studies suggest that fungal biomass, a waste from fermentative industry, has the potential for removal/recovery of toxic metal ions from aqueous solutions.
Page(s): 139-143
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Source:IJBT Vol.04(1) [January 2005]

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