بررسی کارایی سنتز پودر کربن فعال مغناطیسی شده با نانو ذرات Fe3O4 جهت حذف فلز کادمیوم از محلول های آبی با روش پاسخ-سطح مدل باکس بنکن

محورهای موضوعی : آلودگی محیط زیست (آب و فاضلاب)

خوشناز پاینده ¹ , صادق قاسمی ²

1 - استادیارگروه خاک شناسی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران * (مسوول مکاتبات).
2 - باشگاه پژوهشگران جوان و نخبگان، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

تاریخ دریافت : 1395/07/08 تاریخ پذیرش : 1395/09/03 تاریخ انتشار : 1398/08/01

کلید واژه: حذف آلاینده, کربن فعال مغناطیسی شده, فلز سنگین,

چکیده مقاله :

زمینه و هدف : روش جداسازی مغناطیسی به دلیل هزینه کم، سادگی و سرعت بالای جداسازی و همچنین راندمان بالا به طور گسترده ای در حذف آلاینده ها و رفع معضلات پیرامون محیط زیست استفاده شده است. هدف از این مطالعه سنتز کربن فعال مغناطیسی شده با نانو ذرات اکسید آهن مغناطیسی Fe3O4 جهت حذف فلز سمی کادمیوم از محیط های آبی می باشد . روش بررسی: جاذب مغناطیسی با استفاده از روش هم ترسیبی آماده شد و مشخصات فیزیکی و ساختاری جاذب سنتز شده با تکنیک های XRD، TEM و SEM مورد آنالیز قرار گرفت. برای بهینه سازی متغیرها، آزمایش ها با روش پاسخ سطح با کاربرد مدل باکس بنکن توسط نرم افزارMinitab 17 طراحی شدند. متغیرهای (9-5) pH، دما (45-25 درجه سانتی گراد) و مقدار جاذب (2-5/0 گرم) بررسی شدند و تعداد 15 آزمایش طراحی شد. یافته ها: شرایط بهینه بدست آمده جهت حذف کادمیوم با سنتز کربن فعال مغناطیسی شده با نانو ذرات Fe3O4 ، pH=7، دمای 45 درجه سانتی گراد و مقدار 2 گرم جاذب بود . بحث و نتیجه گیری : مطالعه حاضر نشان داد که کربن فعال مغناطیسی پتانسیل بالایی جهت حذف آلاینده کادمیوم دارد. لذا انتظار می رود که مغناطیسی کردن پودر کربن فعال با حفظ خصوصیات فیزیکی و سطحی آن یک روش مناسب برای رفع مشکلات وابسته به آن به ویژه جداسازی و فیلتراسیون باشد.

چکیده انگلیسی:

Background and Objective: Due to its low cost, simplicity and speed of separation and high efficiency, the magnetic separation method widely used to remove contaminants and to solve the problems of the environment. The aim of this study was synthesis of magnetic activated carbon by Fe3O4 and investigating its efficiency in adsorption of Cadmium from aqueous solutions.   Method: Magnetic adsorbent prepared by the method of sequestration and physical characteristics and structure of synthesized absorbent were determined by XRD, SEM and TEM. To remove the Cadmium from aqueous solutions, the Box-behnken design (BBD) of response surface methodology (RSM) was employed for optimizing all parameters affecting the adsorption process. The studied parameters were pH (5-9), temperature (25-45 0C) and the amount of adsorbent (0.5-2 g). 15 experimental runs were calculated by using BBD. Findings: The optimal condition for removal Cadmium by synthesis of magnetic activated carbon by Fe3O4 nanoparticles were pH=7, 450C temperature and the 2 g of adsorbent. Discussion and conclusion: The study showed that magnetic activated carbon has a high potential for removing cadmium. Therefore, it is believed that magnetized active carbon by keeping its physical and surface properties could be a suitable method to solve some related problems including separation and filtration.

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