بررسی سینتیک و تعادل فرایند جذب سرب توسط پودر کربن فعال مغناطیسی شده با نانو ذرات Fe3O4 از محلول‌های آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه خاک شناسی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 دانشجوی دکترا، باشگاه پژوهشگران جوان و نخبگان، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

چکیده

ترکیب نانوذرات مغناطیسی با سایر جاذب‌ها، نه تنها تأثیری بر خواص مغناطیسی‌شان نمی‌گذارد بلکه منجر به ایجاد جاذب‌هایی می‌شود که فرایند تصفیه را اصلاح کرده و بهبود می‌بخشند. هدف از این پژوهش سنتز کربن فعال مغناطیسی شده با نانوذرات اکسید آهن مغناطیسی Fe3O4 برای حذف فلز سمی سرب از محیط‌های آبی بود. جاذب مغناطیسی با استفاده از روش هم‌ترسیبی آماده شد و مشخصات فیزیکی و ساختاری آن‌ با روش‌‌های XRD و TEM مورد آنالیز قرار گرفت. برای بهینه‌سازی متغیرها، آزمایش‌ها با روش سطح پاسخ با کاربرد مدل باکس بنکن توسط نرم‌افزار Minitab 17 طراحی شدند. متغیرهایpH (9-5)، دما (25 تا 45 درجه سلسیوس) و مقدار جاذب (5/0 تا 2 گرم) بررسی شدند و تعداد 15 آزمایش طراحی شد. شرایط بهینه به‌دست آمده برای حذف سرب با سنتز کربن فعال مغناطیسی شده با نانوذرات Fe3O4، در pH برابر 7، دمای 45 درجه سلسیوس و مقدار 2 گرم جاذب اتفاق افتاد. مطالعات سینتیکی نشان داد که حذف سرب از مدل مرتبه دوم تبعیت می‌کند و زمان تماس مناسب 15 دقیقه است. حداکثر درصد حذف سرب بعد از 90 دقیقه 87/86 درصد بود. همچنین طبق نتایج به‌دست آمده، همدمای جذب سطحی سرب تطابق خوبی با ایزوترم لانگمیر نشان داد. مطالعه حاضر نشان داد که کربن فعال مغناطیسی پتانسیل بالایی در حذف آلاینده سرب دارد. لذا انتظار می‌رود که مغناطیسی کردن پودر کربن فعال با حفظ ویژگی‌های فیزیکی و سطحی آن، یک روش مناسب برای رفع مشکلات استفاده از جاذب‌های پودری به‌ویژه در مورد جداسازی و فیلتراسیون آن‌ها باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Kinetics and Equilibrium of Lead-Absorbing Process by Magnetic Activated Carbon Powder with Fe3O4 Nanoparticles from Aqueous Solutions

نویسندگان [English]

  • Khoshnaz Payandeh 1
  • Sadegh Ghasemi 2
1 Assist. Prof., Department of Soil Science, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 PhD Student, Young Researchers and Elite Club, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
چکیده [English]

The combination of magnetic nanoparticles with other adsorbents not only does not affect their magnetic properties, but also leads to the formation of adsorbents that improve the refining process.The aim of this study was synthesis of magnetic activated carbon by Fe3O4 and investigating its efficiency in adsorption of Lead from aqueous solutions. Magnetic adsorbent prepared by the method of sequestration and physical characteristics and structure of synthesized absorbent were determined by XRD and TEM. To remove the Lead 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. The optimal condition for removal of Lead by synthesis of magnetic activated carbon by Fe3O4 nanoparticles were pH=7, 450C temperature and The 2 g of adsorbent. Kinetic studies of the adsorption process specified the  efficiency of the pseudo second-order kinetic model and showed the optimal time was15 min, respectively. The maximum percentage of Lead removed after 90 min was 86.87%. The adsorption isotherm waswell fitted to Longmire model. The study showed that magnetic activated carbon has a high potential for Remove Lead. 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 includingseparation and filtration.

کلیدواژه‌ها [English]

  • Activated carbon
  • Aqueous solutions
  • Lead
  • Removal
  • Nanoparticles

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