Biosorption of Zn2+, Ni2+ and Co2+ from water samples onto Yarrowia lipolytica ISF7 using a response surface methodology, and analyzed by inductively coupled plasma optical emission spectrometry (ICP-OES). Issue 28 (1st March 2016)

• Record Type: Journal Article
• Authors: Asfaram, Arash; Ghaedi, Mehrorang; Ghezelbash, Gholam Reza
• Is Part Of: RSC advances. Volume 6:Issue 28(2016)
• Page Start: 23599
• Page End: 23610
• Publication Date: 2016-03-01
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra27170c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A response surface methodology (RSM) was employed to interpret biosorption efficiency. Abstract : A response surface methodology (RSM) based on a central composite design with five variables and five levels was employed to interpret the biosorption efficiency of Zn 2+, Ni 2+ and Co 2+ ions onto Yarrowia lipolytica ISF7. Independent variables, viz. pH, temperature, and Zn 2+, Ni 2+ and Co 2+ ion concentrations were transformed into coded values and a quadratic model was built to predict the responses. Analysis of variance (ANOVA) and t -test statistics were used to test the significance of the independent variables and their interactions. The predicted maximum biosorption efficiencies (99.65, 99.30 and 98.78% for Zn 2+, Ni 2+ and Co 2+ ions, respectively) under the optimum recommended conditions (pH 6.0, 25 °C, 30, 25 and 30 mg L −1 of Zn 2+, Ni 2+ and Co 2+ ions) following 24 h mixing were very close to the experimental values (99.65, 99.30 and 98.78% for Zn 2+, Ni 2+ and Co 2+ ions, respectively). The equilibrium equation was extensively investigated and found to be efficiently represented by a Langmuir model with maximum monolayer biosorption capacities of 31.96, 24.40 and 25.77 mg g −1 for Zn 2+, Ni 2+ and Co 2+, respectively. The biosorption data trend closely followed a pseudo-second-order kinetic model. FTIR and scanning electron microscopy coupled with X-ray energy dispersed analysis (SEM-EDX) provided proof of progress of ion biosorption on the yeast surfaces.