با همکاری انجمن علوم و صنایع غذایی ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و صنایع غذایی، واحد شهر قدس، دانشگاه آزاد اسلامی، تهران، ایران.

2 باشگاه پژوهشگران جوان، واحد شهر قدس، دانشگاه آزاد اسلامی، تهران، ایران.

چکیده

پوست انار یکی از منابع مهم ترکیبات زیست فعال بوده که توانایی بالایی در جایگزینی منبع زغال فعال مناسب برای جذب فلزات سنگین و رنگ‌بری در محیط مایع دارد. هدف از این تحقیق بررسی توانایی پوست انار در کاهش غلظت فلزات سنگین موجود در آب و روغن و همچنین ارزیابی عملکرد رنگ‌بری روغن آن است. در مرحله اول تحقیق شرایط جذب یون‌های فلزی در محیط آبی بهینه‌سازی گردید به‌این‌ترتیب که سه متغیر مستقل pH (X1)، زمان مجاورت ماده جاذب و فلزات (X2)  و غلظت ماده جاذب در محیط آبی (X3) بر درصد جذب یون‌های آهن و کروم (متغیرهای وابسته) بر اساس طرح باکس- بانکن بررسی شد. نتایج نشان داد که بیشترین جذب فلزات در شرایط 3/5=pH، در زمان 200 دقیقه و غلظت ماده جاذب 5/2 گرم در لیتر روی می‌دهد. در شرایط بهینه جذب فلزات سنگین سرب، جیوه و آرسنیک نیز مورد ارزیابی قرار گرفت و نتایج نشان داد که جاذب باعث کاهش 80 درصدی این یون‌ها می‌شود. در مرحله بعد توانایی رنگ‌بری و کاهش فلزات سنگین زغال فعال تولیدی در محیط روغن موردبررسی قرار گرفت. نتایج نشان داد این جاذب توانایی خوبی برای رنگ‌بری و پایداری اکسیداسیون روغن دارد. در رابطه با کاهش فلزات سنگین روغن نیز ماده جاذب تولیدشده از پوست انار عملکرد بهتری نسبت به خاک رنگ‌بر تجاری نشان داد.

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of pomegranate peel carbon potential as a adsorbent of pigment and bi and trivalent metals in liquid media

نویسندگان [English]

  • Narges Hadigol 1
  • Maryam Fahim danesh 1
  • Sepideh Hoseini 2

1 Department of Food Science and Technology, Shahr-e-Qods Branch, Islamic Azad University-Tehran- Iran.

2 Department of Food Science and Technology, Shahr-e-Qods Branch, Islamic Azad University-Tehran- Iran.

چکیده [English]

Introduction: Pomegranate peel is an important source of bioactive compounds which have high potential of alternative source of activated carbon for bleaching and the removal of heavy metal from liquid media. The present study was undertaken to evaluate the feasibility of pomegranate peel carbon for the removal of heavy metal from oil and aqueous solution and then to investigate its activity in the bleaching of sesame oil.
 
Materials and methods: Response surface methodology and Box-Behnken design were applied to study and optimize the adsorption condition to remove metal ions on prepared pomegranate peel adsorbent. For this purpose, the effects of three independent variable pH(X1), contact time (X2) and adsorbent dose (X3) on metal ions concentration (dependent variable) were studied using a three-level three-factor Box–Behnken design. In addition, different types of adsorbents (pomegranate peel carbon and activated earth) were tested for adsorption of pigment, peroxides and heavy metals of sesame oil.
 
Results and discussion: Results showed that optimum condition required for maximum adsorption were found to pH= 5.3, equilibrium time 200 min and adsorbent concentration 2.5 g/L. Under the optimal conditions the removal of heavy metals i.e. Fe, Cr, Pb, as and Hg from aqueous solution by activated carbon developed from pomegranate peel are more than 80%. Results of sesame oil bleaching with pomegranate peel carbon showed good bleaching efficiency and oxidative stability. Furthermore, pomegranate peel carbon comparing with bleaching earth showed better ability to decrease heavy metal content of oil.
 

کلیدواژه‌ها [English]

  • Adsorbatey
  • Adsorbent
  • Chromium
  • Heavy metals
  • Lead
  • Pomegranate Peel
  • Iron
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