بررسی تجربی بازیافت کبالت اکسید از باطری های مستعمل
محورهای موضوعی : کاربرد شیمی در محیط زیست
کلید واژه: کلیدواژه: بازیافت, باطری مستعمل یون لیتیوم, نانوذرات مغناطیسی کبالت, هیدرازین, سدیم بورو هیدرات,
چکیده مقاله :
در این تحقیق ابتدا ترکیب کبالت اکسید در شرایط بهینه از باطری مستعمل یون لیتیوم با استفاده از روش هیدرومتالوژیکال بازیافت شد. بر اساس نتایج پراش اشعه ایکس (XRD) مقدار 89/81 درصد وزنی کبالت اکسید و 11/0 درصد نیکل اکسید در نمونه اولیه باطری مستعمل یون لیتیوم وجود دارد. شرایط بهینه در بازیافت کبالت اکسید از 5/0 گرم نمونه مستعمل باطری اولیه عبارت از مصرف 62/18 میلی لیتر هیدروکلریدریک اسید(607/0مول) به همراه 2 میلی لیتر هیدروژن پراکسید (065/0مول) در دمای 50 درجه سانتی گراد در مدت 2 ساعت فرآیند لیچینگ است. طیف پراش اشعه ایکس باز یافت کبالت اکسید را تایید می کند. در مرحله بعد، از طریق تبدیل کبالت اکسید به ترکیب نامحلول و واسطه کبالت کربنات، نانوذرات کبالت با روش سنتز فاز مایع از دو مسیر مختلف و با استفاده از دو کاهنده متفاوت هیدرازین و سدیم بورو هیدرات سنتز گردید. نتایج حاصل از پراش اشعه ایکس تشکیل نانو ذرات کبالت را تایید نمود. بررسی مورفولوژی و اندازه ذرات بر اساس تصاویر به دست آمده از میکروسکوپ الکترونی روبشی (SEM) حاکی از آن است که نانو ذرات نسبتا کروی شکل کبالت با استفاده از هیدرازین با قطر حد اکثر 30 نانو متر و با استفاده از سدیم بور هیدرید با قطرکم تر از 50 نانومتر به طور رضایت بخش سنتز شده است.
Abstract In this work, cobalt oxide was primarily recycled from spent lithium- ion battery at optimum condition by using hydro-metallurgical method. Based on the preliminary results from X-ray diffraction (XRD) analysis, there are cobalt oxide 81.89% and nickel oxide 0.11%, as typical nickel compounds in spent lithium- ion batteries. The optimum recycling condition of cobalt oxide from spent battery sample (0.5 g) by leaching is as follow: the use of 18.62 mL (0.607 mole) hydrochloric acid and 2 mL (0.065 mole) hydrogen peroxide at 50°C for 2 hours. The X-ray diffraction (XRD) spectrum confirms the recycling of cobalt oxide. In the second step, cobalt oxide was converted into insoluble cobalt carbonate intermediate. Consequently, cobalt nanoparticles were synthesized via liquid phase reaction by using two separate reducing agents; hydrazine or sodium boro-hydrate, while proceeding different routes. The molecular and crystal structures of the prepared cobalt nanoparticles were approved by X-ray diffraction. The morphology of surface and size characterization of nanoparticles by scanning electron microscopy (SEM) indicated that spherical shape cobalt nanoparticles with maximum 30 nm and 50 nm diameter were successfully synthesized by using hydrazine and sodium boro-hydrate reducing agents respectively.
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]21 [مرعشی، پ.، 1383، میکروسکوپهای الکترونی و روشهای نوین آنالیز ابزار شناسایی دنیای نانو، دانشگاه علم و صنعت ایران
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