بررسی جذب زیستی توریم از محلول‌های آبی توسط جلبک قهوه‌ای سیستوسیرا اندیکای اصلاح ‌شده به روش زانتاسیون

نوع مقاله: مقاله پژوهشی

نویسندگان

1 . دانشکده‌ی مهندسی شیمی، دانشگاه تهران، صندوق پستی: 4563-11155، تهران ـ ایران

2 پژوهشکده‌ی مواد و سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران ـ ایران

3 دانشکده‌ی مهندسی شیمی، دانشگاه تهران، صندوق پستی: 4563-11155، تهران ـ ایران

چکیده

توانایی جلبک سیستوسیرا اندیکای اصلاح ‌شده به روش زانتاسیون، در جذب زیستی یون­های توریم (IV) از محلول‌های آبی در روش ناپیوسته بررسی شد. اثر سه متغیر مستقل فرایند شامل pH (2-6)، غلظت اولیه­ی یون فلزی (1-mg L 50 تا 1-mg L 250) و مقدار جاذب
 (0.5 g L-1تا 2.5 g L-1) با استفاده از روش سطح پاسخ (RSM) براساس طرح مرکب مرکزی (CCD) مورد ارزیابی قرار گرفت. اعتبار مدل درجه­ی دوم با استفاده از تحلیل واریانس مانند مقدار کم‌ ارزش-P، مقدار بالای ارزش-F و ضریب رگرسیون بالا تأیید شد. نتیجه­های بهینه‌سازی نشان داد که میزان جذب توریم (IV) تحت شرایط بهینه (pH=3.31، غلظت اولیه­ی 1- mg L­250 و مقدار جاذب 0.5 g L-1) 230.628 mg g-1  است. داده­های مدل‌سازی نشان داد که داده‌های تجربی سرعت جذب توریم توسط مدل سینتیکی شبه مرتبه­ی دوم بهتر برازش می‌شوند و هم‌چنین هم­دمای لانگمیر داده‌های تجربی تعادلی جذب را به‌خوبی توصیف می‌کند. حداکثر ظرفیت جذب توریم به‌وسیله­ی هم­دمای لانگمیر329.90 mg g-1  تخمین زده شد. علاوه بر این، مشخصه­های سطح جلبک و سازوکار جذب با استفاده از تحلیل تبدیل فوریه زیرقرمز (FTIR) بررسی شد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Thorium Biosorption from Aqueous Solutions by Chemically Modified Brown Algae Cystoseira Indica using Xanthation Method

نویسندگان [English]

  • M Mofres 1
  • A Keshtkar 2
  • M.A Moosavian 3
چکیده [English]

In this work, the ability of the modified Cystoseira indica algae by the Xanthation method has been investigated for the biosorption of Th (IV) ions from aqueous solution in the batch mode. The effects of the three process independent variables including pH(2–6), biomass dosage (0.5 g L-1 – 2.5 g L-1) and initial metal concentration(50 mg L-1 – 250 mg L-1) were investigated using the response surface methodology (RSM) based on the central composite design (CCD). The accuracy of the model was confirmed by ANOVA such as low p-value, high F-value and Regression. The results of the optimization showed that the biosorption capacity of Th(IV) under the optimal conditions (pH=3.31, initial concentration 250 mg L-1, and biosorbent concentration 0.5 g L-1) will be 230.628 mg g-1. The results of the modeling showed that the experimental data of biosorption rate of thorium were better fitted by the pseudo second-order kinetic model, and also the Langmuir isotherm describes the experimental data of biosorption quite well. The maximum biosorption capacity of thorium was estimated to be 329.90 mg g-1 by the Langmuir isotherm. In addition, the specifications surface of algae and mechanism of biosorption were investigated using the Fourier transform infrared (FTIR) analysis.

کلیدواژه‌ها [English]

  • Biosorption
  • Thorium
  • Cystoseira Indica
  • Xanthation
  • Response surface methodology (RSM)
  • Central composite design (CCD)

 

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