Enhanced Biosorption of Pb(II) Ions from Aqueous Solutions onto Citric Acid Treated Aspergillus niger Biomass: Equilibrium and Kinetic Studies

Vinay Kumar Chintalapudi1,2, Ramya Krishna S.L. Kanamarlapudi2, Useni Reddy Mallu1 and Sudhamani Muddada2,*

1R V Labs, Flat No. 1, First Floor Greeshma Residency, Beside Military Canteen, Syamala Nagar, Guntur-522006, India

2Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Greenfields, Vaddeswaram-522502, India

*Corresponding author: Fax: +91 863 2388999; Tel.: +91 863 2399999; E-mail: sudhamani1@rediffmail.com

Abstract

In the present study, initially Aspergillus niger was tested for biosorption of Pb(II) ions and then studied the effect of pretreatment for enhanced biosorption. It was found that the maximum biosorption potential was achieved with citric acid treatment (70.56 %) in comparison with the biomass without treatment (65.46 %) at a biosorbent dose of 20 mg/L, pH 4, 100 rpm, 37 ºC for 8 h. The optimized conditions for treated Aspergillus niger were determined by optimizing the biosorption parameters such as pH, temperature, biomass dose, incubation time and agitation speed. This study indicates that the citric acid treated Aspergillus niger is an effective biosorbent for removal of lead(II) at optimized conditions with the maximum biosorption potential of 83.6 % as compared to previous reported work. SEM-EDX and FTIR analysis showed the structural variations and the functional groups involved in lead biosorption, respectively. Biosorption kinetics showed that pseudo second order kinetic model as the better fit.

Keywords

Aspergillus niger, Biosorption, Citric acid, Incubation, Kinetics, Lead.

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