نوع مقاله: مقاله پژوهشی
نویسندگان
1 پژوهشکده ی چرخه ی سوخت هسته ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، صندوق پستی: 8486-11365، تهران ـ ایران
2 گروه مهندسی معدن، دانشکده ی فنی و مهندسی، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، صندوق پستی: 143-14115، تهران ـ ایران
چکیده
جذب زیستی فلزهای سنگین از پس‌آب تأسیسات فراوری شیمیایی اورانیم اصفهان با استفاده از «زیست‌جاذب مغناطیسی» متشکل از تفاله‌ی نیشکر آلاییده شده با نانوذرات منیتیت (4O3Fe) و بهینه‌سازی پارامترهای فرایندی آن به روش ناپیوسته مورد بررسی آزمایشگاهی قرار گرفت. نتایج جذب نشان داد که زیست‌جاذب مغناطیسی تهیه شده عملکرد خوبی در جذب یونهای فلزهای سنگین (U، Ni و Cu) دارد. علاوه بر آن pH حدود 5 و زمان تماس 90 دقیقه به عنوان شرایط بهینه‌ی فرایند جذب زیستی یونهای سنگین به دست آمد. هم‌چنین داده‌های سینتیکی با معادله‌ی سرعت شبه مرتبه‌ی دوم به خوبی برازش شدند. از طرف دیگر، با افزایش مقدار زیست توده، ظرفیت جذب کاهش یافت. بررسی نتایج طیف‌سنجی تبدیل فوریه‌ی زیرقرمز قبل و بعد از تماس جاذب با پس‌آب نشان داد که در جذب فلزهای سنگین از پس‌آب، بیش‌ترین نقش از آنِ گروه‌های عاملی هیدروکسیل، کربوکسیل و آمین روی جاذب بوده است.
کلیدواژه‌ها
عنوان مقاله [English]
Adsorptive remval of heavy metals from Esfahan uranium conversion facility (UCF) wastewater by bagass impregnated with magnetic nanoparticles
نویسندگان [English]
- Saeid Alamdarmilani 1
- kaveh Darabi 2
- Behzad Maraghemianji 1
- Ahmad Amrolah Abhari 1
چکیده [English]
The adsorptive removal of heavy metals (U, Ni and Cu) from Esfahan Uranium Conversion Facility (UCF) wastewater was studied in the laboratory by means of batch method using a magnetic biosorbent composed of nanoparticles of magnetite coverd with sugarcane bagas. The findings indicated that the prepared magnetic biosorbent is suitable for the removal of heavy metals. Furthemore, pH of 5 and equilibrium time of 90 min were adequate to set out the optimum condition of heavy metal biosorption process. The kinetic data were fitted well to a pseudo-second-order rate equation. On the other hand, the results showed that biosorption capacity is decreased by increasing the biosorben dosage. The FT-IR analysis of the adsorbent before and after entering into the contact with wastewater showed that functional groups of hydroxyl, carboxyl and amine have the most important role in the heavy metal biosorption.
کلیدواژه‌ها [English]
- Heavy metals removal
- Magnetic biosorbent
- Bagass
- Wastewater
- Kinetics
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