حذف موثر کادمیوم از محیطهای آبی با کامپوزیتی از خاکستر سبک زغالسنگ و زیست سطح ساز رامنولیپیدی

پوربهاءالدینی زرندی, مهلا; خوشدست, حمید; دره زرشکی, اسماعیل; شجاعی, وحیده

doi:10.30479/jmre.2020.11434.1309

حذف موثر کادمیوم از محیطهای آبی با کامپوزیتی از خاکستر سبک زغالسنگ و زیست سطح ساز رامنولیپیدی

نوع مقاله : علمی-پژوهشی

نویسندگان

¹ دانشجوی کارشناسی ارشد فرآوری مواد معدنی، بخش مهندسی معدن، مجتمع آموزش عالی زرند، زرند

² استادیار، بخش مهندسی معدن، مجتمع آموزش عالی زرند، زرند

³ استادیار، آزمایشگاه تحقیقات و علوم کاربردی، دانشگاه شهید باهنر کرمان، کرمان

10.30479/jmre.2020.11434.1309

چکیده

در این پژوهش امکان حذف کادمیوم از محیط‌های آب با استفاده از یک زیست‌کامپوزیت جدید که بر پایه خاکستر سبک زغال‌سنگ و بیوسورفکتانت رامنولیپیدی تولید شده، مورد بررسی قرار گرفته است. شرایط عملیاتی فرایند جذب، با در نظرگرفتن pH محلول و نسبت جاذب به فلز به‌عنوان معیارهای عملیاتی و تأثیر آنها بر کارآیی حذف کادمیوم به‌عنوان پاسخ فرایند، در قالب یک طرح آزمایشی مرکب مرکزی بررسی و بهینه شد. نتایج نشان داد که هر دو معیار به‎طور مستقیم بر کارایی حذف، اثر مثبت دارند. بر اساس نتایج بهینه‌سازی، در مقدار pH برابر 10 و نسبت جاذب به فلز 40، بیش از 99درصد فلز از محلول حذف شد. مطالعه پیشرفت فرایند نسبت به زمان، نشان داد که جذب از سینتیک مرتبه اول با نرخ 57/548 بر دقیقه پیروی می‌کند. مقایسه مدل‌های مختلف هم‌دمای جذب نیز نشان داد که این فرایند به دلیل تطابق با معادله لانگمویر، از جذبی تک‌لایه با توزیع یکنواخت انرژی جذب بر سطح جاذب پیروی می‌کند. در این شرایط، بیشینه جذب برابر 11/67 میلی‌گرم فلز به ازای هر گرم زیست‌کامپوزیت حاصل شد. نتایج مطالعات گزینش‌پذیری نیز نشان‌دهنده قدرت جذب بسیار بالای جاذب بود و ضرایب گزینش‌پذیری برای فلزات کادمیوم، مس، سرب و روی تقریباً یکسان با یکدیگر و برابر واحد به‌دست آمد. این نتایج نشان داد که کامپوزیت‌های پایه خاکستر سبک و بیوسورفکتانت‌ها را می‌توان به‎عنوان منبعی امیدبخش برای اهداف پالایش زیست‌محیطی مورد استفاده قرار داد.

کلیدواژه‌ها

عنوان مقاله [English]

Efficient Cadmium Removal from Aqueous Environments Using a Composite Produced by Coal Fly Ash and Rhamnolipid Biosurfactants

نویسندگان [English]

M. Poorbahaadini Zarandi ¹
H. Khoshdast ²
E. Darezereshki ³
V. Shojaei ²

¹ M.Sc Student, Dept. of Mining Engineering, Higher Education Complex of Zarand, Zarand, Iran

² Assistant Professor, Dept. of Mining Engineering, Higher Education Complex of Zarand, Zarand, Iran

³ Assistant Professor, Central Laboratory of Applied Research, Shahid Bahonar University of Kerman, Kerman, Iran

چکیده [English]

A novel bio-composite produced from coal fly ash accompanied by rhamnolipid biosurfactants was produced and used as an efficient adsorbent for the removal of cadmium from aqueous solution. Effects of initial solution pH (3-11) and absorbent to cadmium ratio (40-200) on cadmium removal, as process response, were studied and optimized using a central composite type response surface methodology. Results showed that both factors significantly affect the removal efficiency. Optimum adsorption conditions, resulting in over 99% cadmium removal, were achieved at pH 10 and absorbent to cadmium ratio of 40. Time-wise studies revealed that a maximum removal can be achieved following a classic first order model with a rate of 548.57 min-1. The cadmium adsorption on activated fly ash was also found to follow the Langmuir isotherm model with monolayer adsorption mechanism. Moreover, the bio-composite yielded a maximum adsorptive capacity of 67.11 mg/g. The selectivity study in bimetal aqueous systems using copper, lead and zinc metals also confirmed the high adsorption capacity of bio-composite. This study demonstrated that rhamnolipid-fly ash bio-composite could be considered as a promising efficient, low-cost resource material for the treatment of heavy metal polluted wastewaters.

کلیدواژه‌ها [English]

Fly Ash
Rhamnolipid Biosurfactant
Adsorption
Heavy Metal
Wastewater

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