مهندسی شیمی ایران

مهندسی شیمی ایران

مطالعۀ سینیتیک، ایزوترم و ترمودینامیک جذب زیستی اورانیوم به‌وسیلۀ میکروجلبک کلرلا ولگاریس

نوع مقاله : مقاله پژوهشی

نویسندگان
استادیار مهندسی شیمی، پزوهشگاه علوم و فنون هسته ای
چکیده
سینیتیک و ترمودینامیک جذب زیستی اورانیوم به‌وسیلۀ میکروجلبک کلرلا ولگاریس در یک سامانۀ ناپیوسته در دماها و غلظتهای مختلف مطالعه شد. اثر مشخصه‌های مؤثر همانند pH، زمان تماس، غلظت اولیۀ آلاینده و دما بر میزان جذب، مطالعه شد. با بررسی اثر pH مقدار بهینۀ آن 4/5 مشخص شد و در دامنۀ دما و غلظت مورد مطالعه بیشینۀ مقدار جذب در دمای   15 درجه سلسیوس و غلظت اولیۀ 500mg/L  رخ داد. مشاهده شد که ظرفیت جذب میکروجلبک کلرلا ولگاریس برای اورانیوم با افزایش دما کاهش می‌یابد. برای مطالعۀ سینیتیک فرایند جذب از مدل سینیتیکی نوع اشباعی استفاده شد و ضرایب همبستگی نشان داد که این مدل برای جذب زیستی اورانیوم مناسب است. با مدلسازی ایزوترم جذب اورانیوم به‌وسیلۀ میکروجلبک با مدل‌های لانگمیر و فرندلیچ مشاهده شد که داده‌های آزمایشگاهی با ایزوترم لانگمیر تطابق مناسبی دارد. همچنین با استفاده از ثابتهای تعادل در دماهای مختلف، مشخصه‌های ترمودینامیکی (DS، DH و DG) تعیین شد که حاکی از گرمازایی و خودبهخودی بودن فرایند است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Kinetic, Isotherm, and Thermodynamic Study of Uranium Biosorption by Microalgae Chlorella Vulgaris

نویسندگان English

M. H. Khani
A. A. Gh. Khamseh
Associate Professor of Chemical Engineering, Nuclear Science and Technology Research Institute
چکیده English

Kinetics and thermodynamics of biosorption of uranium by microalgae Chlorella vulgaris were studied in a batch system at different temperatures and concentrations. The effect of parameters such as pH, contact time, initial pollutant concentration and temperature on the absorption was studied. By investigating the effect of pH, its optimal value was determined to be 4.5 in the studied temperature and concentration range. The maximum absorption value occurred at a temperature of 15°C and an initial concentration of 500 mg/L. It was observed that the absorption capacity of microalgae Chlorella vulgaris for uranium, decreases with increasing temperature. To study the kinetics of the adsorption process, the saturation type kinetic model was used and the correlation coefficients showed that this model is suitable for uranium biosorption. By modeling the equilibrium sorption of uranium absorption by microalgae with Langmuir and Freundlich models, it was observed that the experimental data is in good agreement with the Langmuir isotherm. Also, by using equilibrium constants at different temperatures, thermodynamic parameters (DS, DH and DG) were determined, which indicates exothermal and spontaneity of the process

کلیدواژه‌ها English

Uranium
Biosorption Kinetics
Biosorption Thermodynamics
Microalgae Chlorella Vulgaris
Equilibrium Modeling
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