سنتز نانو ذرات مگنتیت (Fe3O4) و بررسی کارایی آن در حذف کادمیم از محلول آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دکترای آبیاری و زهکشی، دانشگاه آزاد اسلامی، واحد اهواز، باشگاه پژوهشگران جوان، اهواز

2 استاد گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران، اهواز

3 استاد گروه آبیاری، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات خوزستان، اهواز

4 استادیار گروه خاکشناسی، دانشکده کشاورزی، دانشگاه شهید چمران، اهواز

5 استادیار گروه مهندسی بهداشت محیط، دانشکده بهداشت و عضو مرکز تحقیقات فناوری‌های محیط زیستی، دانشگاه علوم پزشکی جندی شاپور، اهواز

چکیده

هدف از این پژوهش سنتز نانو ذرات مگنتیت (Fe3O4) و تعیین کارایی آن در حذف کادمیم از محیط آبی بود. به این منظور نانو ذرات مگنتیت سنتز گردید و تأثیر پارامترهای pH ، زمان تماس، غلظت کادمیم و مقدار نانو ذرات بر کارایی حذف کادمیم در سیستم ناپیوسته مورد بررسی قرار گرفت. برای تعیین ویژگی‌های نانو ذرات مگنتیت تولیدی از میکروسکوپ الکترونی روبشی، دستگاه پراش نگار اشعه و طیف سنج مادون قرمز استفاده شد. تصویر برداری از نانو ذرات تولیدی با میکروسکوپ الکترونی نشان داد که قطر این ذرات 40 تا 60 نانومتر است. نتایج نشان داد که با افزایش pH محلول از 3 تا 6 ظرفیت و بازده جذب کادمیم افزایش می‌یابد به‌طوری‌که در pH برابر 6 به حداکثر مقدار خود رسید، سپس در pH های 7 و 8 بازده و ظرفیت جذب کاهش یافت. لذا pH برابر 6 به‌عنوان pH بهینه انتخاب گردید. زمان تعادل برابر 30 دقیقه و مقدار جاذب بهینه 4/0 گرم به‌دست آمد. با افزایش غلظت یون‌های کادمیم و کاهش مقدار جاذب، ظرفیت جذب افزایش و بازده جذب کاهش یافت. نتایج این مطالعه نشان داد که نانو ذرات مگنتیت دارای مزایایی از قبیل کارایی حذف بالا و زمان واکنش کوتاه است و می‌تواند به‌عنوان یک روش در حذف کادمیم از محلولهای آبی استفاده شود.

کلیدواژه‌ها


عنوان مقاله [English]

Synthesis of Magnetite Nanoparticles (Fe3O4) and its Efficiency in Cadmium Removal from Aqueous Solutions

نویسندگان [English]

  • Mehdi Bahrami 1
  • Saied Broomand nasab 2
  • Heidarali Kashkooli 3
  • Ahmad Farrokhian Firouzi 4
  • Aliakbar Babaei 5
چکیده [English]

The objectives of this research were to synthesize magnetite nanoparticles (Fe3O4) and determining its efficiency in Cadmium removal from aqueous solutions. Consequently, magnetite nanoparticles were synthesized and the effect of pH, contact time, Cadmium concentration and nanoparticles amount on cadmium removal efficiency were investigated in batch system. Scanning Electron Microscope (SEM), XRD and FTIR were used to characterization of the synthesized magnetite nanoparticles. SEM results showed that the diameter of the particles is 40-60 nm. Results also showed that the optimum pH value for adsorption was 6. The adsorption capacity increased and the adsorption efficiency decreased with increasing concentration of Cadmium ions and reducing the amount of adsorbent. The magnetite nanoparticles have advantages such as high removal efficiency and short reaction time and can be used as a method to remove Cadmium from aqueous solutions.

کلیدواژه‌ها [English]

  • Magnetite nanoparticles
  • Cadmium
  • Aqueous solution
  • Batch Experiment
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