Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Optimization of Tellurium Biosorption by Pseudomonas Putida Using the Response Surface Method (RSM)

Document Type : Research Article

Authors
Esmaeil Eivazi 1
Seyed Mohammad Ali Mousavian 1
Parisa Tajer Mohammad Ghazvini 2
Ali Reza Keshtkar 2
Hozhabr Sohbatzadeh Lonbar 2
1 Department of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran, I.R. IRAN
2 Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, I.R. IRAN
Abstract
In this research, the biosorption of tellurium from aqueous solutions by Pseudomonas putida was investigated. One Factor at a Time (OFAT) method was used for the investigation of the pH effect, and Response Surface Method (RSM) based on the Central Composite Design (CCD) was used for the investigation of initial tellurium concentration, biosorbent dosage, and contact time on biosorption. Based on the results, the second-order polynomial regression model with correlation coefficient R2=0.937, by proper prediction of process behavior, determined initial Te concentration 109 mg/l, biosorbent dosage 1.17 g/L, contact time 94 minutes optimized as the optimum point at pH=8.5. The adsorption capacity of the biosorbent was 10.1 mg/g at the optimum conditions. The experimental data were analyzed using Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm. Moreover, the Kinetic of biosorption was determined. The equilibrium data were fitted well by the Freundlich model with a correlation coefficient R2=0.996, which showed the biosorption of tellurium is multilayer, and the biosorbent surface is heterogeneous. The maximum biosorption capacity of tellurium was 19.63 mg/g using D-R isotherm. The kinetic studies showed that the tellurium biosorption is very fast and the biosorption capacity reached a maximum of 15 minutes. Finally, the present research precisely confirmed that RSM is a suitable method to predict tellurium biosorption by Pseudomonas putida.
Keywords
Tellurium
Pseudomonas putida
Biosorption
Response surface method (RSM)

Subjects

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