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جذب توریم (IV) از محلول‌های آبی با استفاده از زیست‌جاذب زوج عامل‌دار شده با جلبک و مخمر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پژوهشکده‌ی چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران

2 دانشکده‌ی مهندسی شیمی، پردیس دانشکده‌های فنی، دانشگاه تهران

چکیده

با تثبیت جلبک سیستوسریاایندیکا و مخمرنان ساکارومایسز سرویسیا در سیلیکاژل، یک زیست­‌جاذب دوعاملی برای جذب یون­‌های توریم­(IV) از محلول­‌های آبی فراهم شد. توانایی و ظرفیت جذب این زیست‌­جاذب دوعاملی برای جذب توریم­(IV) از محلول­‌های آبی در روش ناپیوسته ارزیابی شد. با استفاده از روش سطح پاسخ بر پایه‌­ی طرح مرکب مرکزی، تأثیر متغیرهای فرایندی pH (2 تا 6)، زمان (10تا min 180)، غلظت اولیه­‌ی محلول توریم­(IV) (50 تاmg/l  300) و مقدار جاذب (0.5 تا g/l 5) بر جذب زیستی توریم­(IV) از
محیط­‌های آبی بررسی، و فرایند جذب بهینه‌­سازی شد. تحلیل واریانس نشان داد که مقادیر جاذب، غلظت اولیه­‌ی محلول توریم­(IV)، زمان و pH به ترتیب، مؤثرترین عوامل در جذب زیستی توریم(IV) هستند. تحت شرایط بهینه­ (pH برابر با 5، زمان­ تماس min 137.5، غلظت اولیه­‌ی g/l 237.5 محلول توریم­(IV) و مقدار
جاذب g/l1.63) میزان ­جذب mg/g 128.82 براورد شد. داده­‌های سینتیکی با معادله‌­ی سینتیکی درجه­‌ی دوم به خوبی برازش شدند. داده‌­های جذب نیز با هم­دمای لانگمویر در مقایسه با هم‌­دمای فروندلیچ و تمکین بهتر توصیف شدند. ظرفیت بیشینه­‌ی زیست­‌جاذب برای جذب توریم(IV) با هم‌­دمای لانگمویر برابر mg/g 142.86 براورد شد. مقادیر
محاسبه‌­شده­‌ی پارامترهای ترمودینامیکی نشان داد که فرایند جذب توریم(IV) در شرایط کاری به کار گرفته شده، خودبه­‌خودی و گرماگیر بوده است و سازوکار فیزیکی دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Adsorption of Th‌(IV) From Aqueous Solutions Using Bi-Functionalized Algae-Yeast Biosorbent

نویسندگان [English]

  • s A. Milani 1
  • Mohamad Karimi 2
  • B Maraghe Mianji 1

چکیده [English]

Immobilized Cystoseira indica algae and Saccharomyces Cerevisiae on the silica gel were used for the biosorption of Th­(IV) from aqueous solutions. Ability and capacity of bi-functionalized algae-­yeast biosorbent for adsorption of thorium­(IV) from aqueous solutions were investigated in a batch method. The response surface methodology (RSM) based on the central composite design (CCD) was used to investigate the effect of pH (2-6), time (10-180 min), initial thorium(IV) concentration (50-300 mg/l) and adsorbent dosage (0.5-5 g/l) on the sorption of thorium­(IV) from aqueous solutions, and to optimize the biosorption of Th­(IV). Variance analysis showed that the adsorbent dosage, initial Th(IV) concentration, time and pH were respectively, the most effective factors in the biosorption of thorium(IV). Under optimal conditions (pH 5, contact time 137.5 min, initial Th(IV) concentration 237.5 mg/l, and adsorbent dosage 1.63 g/l­) the capacity of the biosorbent for Th(IV) was estimated to be 128.82 mg/g. The kinetic data were fitted well the pseudo-second-order rate equation. The biosorption data could be well described by Langmuir isotherm in comparison to Freundlich and Temkin isotherms. The maximum sorption capacity of the biosorbent for Th­(IV), by Langmuir isotherm was estimated to be 142.86 mg/g. The thermodynamic parameters indicated that the biosorption of Th(IV) on the biomass was a spontaneous, and endothermic process, at the studied temperatures and would occur via physical adsorption.

کلیدواژه‌ها [English]

  • Thorium Adsorption
  • Bi-Functionalized Adsorbent
  • Cystoseira Indica
  • Saccharo-Myces Cerevisiae
  • Response Surface Methodology
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مجله علوم و فنون هسته ای
دوره 38، شماره 2 - شماره پیاپی 80
شهریور 1396
صفحه 64-80
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