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Iranian Biomedical Journal، جلد ۲۱، شماره ۶، صفحات ۳۸۰-۳۹۱
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عنوان انگلیسی Equilibrium Isotherm, Kinetic Modeling, Optimization, and Characterization Studies of Cadmium Adsorption by Surface-Engineered Escherichia coli
چکیده انگلیسی مقاله Background: Amongst the methods that remove heavy metals from environment, biosorption approaches have received increased attention because of their environmentally friendly and cost-effective feature, as well as their superior performances. Methods: In the present study, we investigated the ability of a surface-engineered Escherichia coli, carrying the cyanobacterial metallothionein on the cell surface, in the removal of Ca (II) from solution under different experimental conditions. The biosorption process was optimized using central composite design. In parallel, the kinetics of metal biosorption was studied, and the rate constants of different kinetic models were calculated. Results: Cadmium biosorption is followed by the second-order kinetics. Freundlich and Langmuir equations were used to analyze sorption data; characteristic parameters were determined for each adsorption isotherm. The biosorption process was optimized using the central composite design. The optimal cadmium sorption capacity (284.69 nmol/mg biomass) was obtained at 40°C (pH 8) and a biomass dosage of 10 mg. The influence of two elutants, EDTA and CaCl2, was also assessed on metal recovery. Approximately, 68.58% and 56.54% of the adsorbed cadmium were removed by EDTA and CaCl2 during desorption, respectively. The Fourier transform infrared spectrophotometer (FTIR) analysis indicated that carboxyl, amino, phosphoryl, thiol, and hydroxyl are the main chemical groups involved in the cadmium bioadsorption process. Conclusion: Results from this study implied that chemical adsorption on the heterogeneous surface of E. coli E and optimization of adsorption parameters provides a highly efficient bioadsorbent. 
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نویسندگان مقاله ویدا تفکری | vida tafakori
department of cell and molecular sciences, school of biological science, kharazmi university, tehran, iran


رضا zadmard | reza zadmard
chemistry and chemical engineering research center of iran, tehran, iran;


فاطمه تابنده | fatemeh tabandeh
department of industrial and environmental biotechnology, national institute of genetic engineering and biotechnology nigeb , tehran, iran;

سازمان اصلی تایید شده: پژوهشگاه ملی مهندسی ژنتیک و زیست فناوری

محمد علی آموزگار | mohammad ali amoozegar
extremophiles laboratory, department of microbiology, school of biology, college of science, university of tehran, tehran, iran

سازمان اصلی تایید شده: دانشگاه تهران (Tehran university)

غلامرضا احمدیان | gholamreza ahmadian
department of industrial and environmental biotechnology, national institute of genetic engineering and biotechnology nigeb , tehran, iran;

سازمان اصلی تایید شده: پژوهشگاه ملی مهندسی ژنتیک و زیست فناوری

نشانی اینترنتی http://ibj.pasteur.ac.ir/browse.php?a_code=A-10-1-664&slc_lang=en&sid=en
فایل مقاله اشکال در دسترسی به فایل - ./files/site1/rds_journals/125/article-125-421394.pdf
کد مقاله (doi)
زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده Molecular Microbiology
نوع مقاله منتشر شده مقاله کامل
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