جذب زیستی سرب توسط پوست میگو: سینتیک، همدما و جذب وابسته به pH

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجو

2 عضو هیات علمی

3 دانشگاه ولی عصر رفسنجان

چکیده

در این مطالعه برخی عوامل موثر بر جذب سطحی سرب توسط پوست میگو شامل زمان ، pH، غلظت اولیه سرب و مدل‌های سینتیکی و همدمای جذب مورد بررسی قرار گرفت. زمان رسیدن به تعادل برای جذب سرب به‌وسیله‌ی جاذب با افزایش غلظت سرب از 100 تا 1000 میلی‌گرم بر لیتر از 9 میلی‌گرم بر گرم به 2/90 میلی‌گرم بر گرم افزایش یافت. با افزایش pH سوسپانسیون از 4 تا 7، جذب سرب افزایش یافت ولی افزایش بیشتر pH منجر به کاهش معنی‌دار جذب سطحی سرب گردید. به طور متوسط جذب سرب توسط جاذب در pHهای 6 و 7 بیش از 95 درصد بود. مدل شبه رده دوم بهترین برازش را بر داده‌های جذب سرب داشت (99/0≤ R2). مدل‌های سیپس و فروندلیچ داده‌های همدمای جذب سرب را به خوبی توصیف کرده‌اند (96/0≤ R2). طیف مادون قرمز نمونه‌های جاذب قبل و بعد از جذب سرب نشان داد که اتم‌های N گروه‌های عامل آمین در پوست میگو نقش عمده‌ای در جذب سرب داشتند.

کلیدواژه‌ها

عنوان مقاله [English]

Lead biosorption using shrimp shell: Kinetics, isotherms and pH-dependent adsorption

چکیده [English]

The adsorption of lead (Pb) ions from an aqueous solution onto shrimp shell was evaluated in the present study. Several such important parameters influencing the adsorption of Pb (II) ions as initial pH, equilibrium time as well as different initial concentrations of Pb (II) ions was evaluated. The results indicated that the pseudo-second-order kinetic model could describe the kinetics of Pb adsorption by the adsorbent. With increase in Pb concentration from 100 to 1000 mgL-1, the level of Pb adsorbed by shrimp shell increased from 9 mg g-1 to 90.2 mg g-1. Increasing suspension pH from 4 to 7 enhanced the adsorption of Pb. Further increase in pH from 7 to 10 resulted in decrease in the adsorption of the metal ion. The average adsorption of Pb by the adsorbent at pHs 6 and 7 exceeded 95 percent. The Sips and Freundlich models well described the adsorption of Pb isotherms, data. Infrared spectrum analysis of adsorbent (prior to, and after adsorption of Pb) showed that the N atoms of the amine functional groups played a major role in shrimp shell for the adsorption of Pb. 

کلیدواژه‌ها [English]

  • Water and Wastewater
  • Isotherms
  • kinetic
  • Surface adsorption

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تحقیقات آب و خاک ایران
دوره 47، شماره 1
اردیبهشت 1395
صفحه 109-117

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