جذب سطحی آنتیموان از پساب کارخانه طلای زرشوران بر روی نانو ذرات آهن صفرظرفیتی پوشش داده شده بر روی بنتونیت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد فراوری مواد معدنی، دانشگاه تربیت مدرس، تهران

2 دانشیار، رئیس پژوهشگاه محیط زیست، دانشگاه تربیت مدرس، تهران

3 استاد، بخش مهندسی معدن، دانشگاه تربیت مدرس، تهران

چکیده

پساب کارخانه طلای زرشوران دارای مقدار فراوانی آرسنیک، آنتیموان، جیوه و بیسموت است که همگى از عناصر سمی محسوب می‌شوند. زائدات این معادن نیز بسیار سمی بوده و با در معرض انحلال قرارگرفتن آن‌ها، خطر آلودگی کل منطقه وجود دارد. هدفاین پژوهش،بررسیروش‌هایمختلفحذفآنتیموانازآبوپسابودر نهایتتولید نانو ذرات آهن صفر ظرفیتی پوشش داده شده بر روی کانی‌های صنعتی به‌عنوانروشیمؤثروکمهزینهواستفادهازآنبرای حذفآنتیموانازپسابواقعی بود. در این تحقیق نانو ذرات آهن صفر ظرفیتی با ابعاد 40 تا 100 نانومتر با افزودن قطره‌ای از محلول بوروهیدرید سدیم به محلول آبی آهن سه ظرفیتی، در دمای محیط با اختلاط به‌وسیله گاز نیتروژن سنتز شد. برای جلوگیری از آگلومراسیون و افزایش قابلیت کاربرد آن در مصارف محیط‌ زیستی، نانو ذرات‌ آهن بر روی کانی صنعتی بنتونیت پوشش داده شد. برای انجام آزمایش‌های جذب سطحی از شیشه پنی‌سیلین 20 میلی‌لیتری استفاده شد. 10 سی سی از پساب سنتزی - واقعی به داخل شیشه ریخته شد و آزمایش‌ها با مقدار جاذب، زمان،pH و دماهای مختلف، تحت شرایط اختلاط شدید با همزن مغناطیسی انجام شد. بعد از اتمام زمان آزمایش، پساب، فیلتر شد و برای انجام آنالیز جذب اتمی مورد استفاده قرار گرفت. آزمایش‌ها نشان داد که جذب سطحی ذرات سنتز شده از سینتیک مرتبه دوم و ایزوترم فروندلیچ تبعیت می‌کند. ظرفیت جذب آنتیموان برای این ذرات از پساب واقعی 6/2 میلی‌گرم بر گرم جاذب و حداکثر حذف آنتیموان 56/99 درصد به‌دست آمد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Antimony Adsorption from Zarshouran Gold Mineral Processing Plant Wastewater by Nano Zero Valent Iron Coated on Bentonite

نویسندگان [English]

  • nader nosrati 1
  • Ahmad Khodadadi Darban 2
  • Mahmood Abdollahi 3
چکیده [English]

The effluent from Zarshouran gold mineral processing plant contains high quantities of arsenic, antimony, mercury, and bismuth. These metals and metalloids are soluble in water and very toxic when they enter the environment. Their solubility in water causes the polluted area to extend beyond their point of origin. In this article, different methods of antimony removal from water and wastewater were reviewed and the zero-valent iron nanoparticles coated on Bentonite were selected as an effective and low cost material for removing antimony from wastewater. For the purposes of this study, zero-valent iron nanoparticles of 40-100 nanometers in size were synthesized by dropwise addition of sodium borohydride solution to an Iron (III) aqueous solution at  ambient temperature and mixed with nitrogen gas. To avoid particle agglomeration and to enhance the product’s environmentally safe application, the  nanoparticles were coated on Bentonite and characterized by SEM/EDAX and BET. The experiments were carried out by intense mixing of the adsorbent with 10ml of real/synthtic wastewater samples in 20ml bottles.  The effects of pH, contact time, temperature, and adsorbent dosage on antimony removal efficiency were investigated under intense mixing using a magnetic mixer. Finally, the effluents were filtered upon completion of the experiments and used for atomic adsorption analysis. The results of the experiments showed that the adsorption isotherms of the synthesized nanoparticles obeyed the Langmuir and Freundlich models. The experiments carried out on real samples showed that antimony adsorption capacity for B-nZVI was 2.6 mg/g of the adsorbent and that the highest antimony removal efficiency was 99.56%.

کلیدواژه‌ها [English]

  • Antimony
  • Water Pollution
  • Adsorption
  • Nano Zero Valent Iron
  • Bentonite

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