جذب سطحی کروم (VI) از آب‌های آلوده با استفاده از نانوذرات مغناطیسی هسته/پوسته Fe3O4/CoO

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه کردستان، سنندج، ایران

2 دانش‌آموخته کارشناسی ارشد، گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه کردستان، سنندج، ایران

10.22093/wwj.2019.172923.2833

چکیده

کروم (VI) از طریق صنایع متالورژی، رنگسازی، آبکاری و دباغی به منابع آب وارد می‌شود. تجمع کروم در بافت‌های حیوانی و گیاهی می‌تواند موجب ایجاد خطرات جدی شود. کروم در انسان باعث ایجاد اختلال در کار کبد، کلیه و ریه می‌شود. هدف از انجام این پژوهش، حذف کروم (VI) از آب توسط جاذب نانوساختار مغناطیسی هسته/پوسته Fe3O4/CoO است. در این پژوهش، نانوذرات مغناطیسی هسته/پوسته Fe3O4/CoO با روش هم‌رسوبی ساخته شدند و به‌عنوان جاذب در حذف کروم (VI) از آب، به‌کار برده شد. جاذب Fe3O4/CoO با روش‌های ICP،XRD ، TEM و VSM شناسایی شد. اثر pH محلول روی جذب سطحی کروم (VI) بر روی جاذب Fe3O4/CoO بررسی شد. نوع ایزوترم و سینتیک جذب سطحی کروم (VI) بر روی Fe3O4/CoO نیز بررسی شد. تصاویر TEM، تشکیل نانوذرات با ساختار هسته/پوسته را تأیید کرد. آزمایش VSM خاصیت مغناطیسی نانوذرات را نشان داد. نتایج تجربی برازش بهتری با مدل ایزوترم فروندلیچ داشت. در یک عملیات جذب سطحی ناپیوسته، با به‌کاربردن ۵/۱ گرم از جاذب Fe3O4/CoO، ۱۰۰ میلی‌لیتر محلول کروم (VI) با غلظت ۵۰ میلی‌گرم در لیتر و pH برابر 3 و بعد از گذشت ۲۴ ساعت، کارایی حذف کروم (VI) برابر با ۰۴/۸۹ درصد به‌دست آمد. نانوذرات هسته/پوسته مغناطیسی Fe3O4/CoO، علاوه بر این که جاذب خوبی برای حذف کروم (VI) از آب هستند، قابلیت جداسازی آسان از آب به‌وسیله یک نیروی مغناطیسی خارجی را نیز دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Adsorption of Chromium (VI) from Polluted Water Using Core/Shell Nano Magnetic Particles of Fe3O4/CoO

نویسندگان [English]

  • Faranak Akhlaghian 1
  • Maysam Moradi 2
1 Assist. Prof., Dept. of Chemical Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran
2 Former Graduate Student, Dept. of Chemical Engineering, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran
چکیده [English]

Chromium (VI) enters water resources via effluents of metallurgical, chemical pigments, electroplating, and tanning industries. The chromium accumulation in animal and plant tissues can cause serious dangers. In human, chromium (VI) makes damage to liver, kidney, and lung. The aim of this research is the removal of chromium (VI) from water by Fe3O4/CoO nanostructured magnetic adsorbent. In this work, nano magnetic particles of Fe3O4/CoO were synthesized by co-precipitation method and was used for the adsorption of chromium (VI) from water. The Fe3O4/CoO adsorbent was characterized by ICP, XRD, TEM, and VSM methods. Effects of pH on chromium (VI) adsorption on Fe3O4/CoO were studied. The isotherm and kinetics of the adsorption were also studied. TEM images confirmed the formation of the core/shell structure of the nanoparticles. The VSM test showed the magnetic property of the Fe3O4/CoO adsorbent. The experimental data were fitted better to the Freundlich isotherm model. In a batch operation; by using 1.5 g of Fe3O4/CoO adsorbent, 100 mL of chromium (VI) solution with the concentration of 50 mg/L and pH 3, and after 24 h; the chromium (VI) removal yield of 89.04% was obtained. The magnetic nanoparticles of Fe3O4/CoO are good adsorbent to remove chromium (VI) from water with the advantage of easy separation from water by an external magnetic force.

کلیدواژه‌ها [English]

  • Adsorption
  • Chromium (VI)
  • Wastewater Treatment
  • Core/Shell Nano Magnetic Particles
  • Cobalt oxide

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