ارزیابی قدرت جذب اگزروژل تترااتوکسی‌سیلان برای کاتیون‌های Cr3+ و Cu2+

نوع مقاله: مقاله علمی پژوهشی

نویسندگان

1 دانشگاه پیام نور مشهد

2 پژوهشگاه زیست فناوری و مهندسی ژنتیک

چکیده

.دراین تحقیق توانایی اگزروژل  تترااتوکسی سیلان(TEOS) برای جذب دو یون فلزی (+Cr3+,Cu2) ازمحلول های آبی مورد مطالعه قرار گرفت و تاثیر عوامل مختلف مانند زمان، pH، مقدار جاذب و دما روی جذب این فلزات بررسی گردید. همچنین رفتار جذب این دو کاتیون توسط مدل های مختلف ایزوترم مورد ارزیابی قرارگرفت. نتایج جذب بهترین تطابق را با مدل ایزوترم دوبینین- راداشکویچ داشتند که موید قدرت جذب بالاتر +Cr3 با بیشینه ظرفیت جذب   20/65 mg/g نسبت به+Cu2  با بیشینه ظرفیت جذب 10/42 mg/g بودند. مطالعات سینتیکی نیز نشان داد که فرایند جذب در مورد+ Cr3 و+Cu2 از مدل شبه درجه دوم تبعیت می کند. بررسی های ترمودینامیکی نشان از خودبخودی بودن فرآیند جذب کاتیون های فوق دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of adsorption of Chromium & Copper ions on TEOS xerogel

نویسندگان [English]

  • Ali Aslrousta 1
  • Khamal haghbeen 2
چکیده [English]

In this research, TEOS xerogel was produced by sol-gel method and the best adsorbents for removal of heavy metals were chosen by test on this xerogel. TEOS xerogel was used for adsorption of Cr(III) and Cu(II). Various parameters such as contact time, pH, amount of adsorbent and temperature effect on metals adsorption were investigated.Besides , different models of equilibrium adsorption isotherms like Freundlich , Tempkin and Dubinin-Radoshkevich isotherm model were studied and their constants were determined. By searching on final results got from these isotherms were showed that the Dubinin-Radoshkevich isotherm model was fitted well with adsorption data.  From the kinetic studies were carried out, it became clear that Pesudo-second order model was fitted with adsorption data of Cr(III)  and Cu (II) on TEOS .  Thermodynamic investigations were showed that the adsorption process of all heavy metals on adsorbents is spontaneous. 

کلیدواژه‌ها [English]

  • Xerogel
  • Adsorption
  • Cu2+
  • Cr3+
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