نانوجاذب جدید GH-92 با استفاده از اسفنج‌های خلیج فارس برای جداسازی سرب و کادمیم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استاد، دانشکده علوم و فنون دریایی، دانشگاه آزاد اسلامی، واحد تهران شمال

2 دانشجوی کارشناسی ارشد شیمی دریا، دانشکده علوم وفنون دریایی، دانشگاه آزاد اسلامی، واحد تهران شمال

3 استادیار، دانشکده علوم وفنون دریایی، دانشگاه آزاد اسلامی، واحد تهران شمال

چکیده

حذف آلاینده‌ها در اکوسیستم‌های آبی به‌ویژه آب‌های آشامیدنی، همواره مورد نظر پژوهشگران بوده است. در دهه‌های اخیر، از ترکیبات طبیعی به‌عنوان جاذب در حذف آلاینده‌ها به‌فراوانی استفاده شده است. پژوهش‌های مختلف انجام گرفته در دنیا، نشان داده است که یکی از روش‌های مؤثر در زمینه حذف آلاینده‌ها، فناوری نانو است. در این پژوهش، برای اولین بار در دنیا از یک گونه از اسفنج‌های بومی خلیج فارس متعلق به رده دموسپونژیا که دارای حفره‌های نانو است برای حذف یون‌های کلسیم، منیزیم، کبالت، کادمیم و سرب از آب استفاده شد. میزان جذب در دانه‌بندی‌های مختلف اسفنج، زمان تماس و میزان pH بررسی شد. نتایج نشان داد که این نوع اسفنج قادر است مقادیر مختلفی از یون‌های یاد شده را جذب نماید. میزان جذب یون‌های کلسیم، منیزیم و کبالت توسط این نوع اسفنج بسیار ناچیز بود و بیشترین ظرفیت جذب مربوط به یون کادمیم در محدوده pH برابر 5 و غلظت 5 میلی‌گرم در لیتر، برابر 37/2 میلی‌گرم بر گرم و یون سرب در محدوده pH برابر 5/4 تا 5 و غلظت 300 میلی‌گرم در لیترو اندازه ذرات با دانه‌بندی230 مش با ظرفیت جذب 19/79 میلی‌گرم، به‌ازای هر گرم جاذب به‌دست آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A Novel GH-92 Nano-Adsorbent Using the Sponge from the Persian Gulf for Lead and Cadmium Removal

نویسندگان [English]

  • Hossein Ghafourian 1
  • Ensiye Khodadad Hosseini 2
  • Mohammad Rabbani 3
1 . Prof. of Chemistry, Faculty of Marine Sciences and Technology, Islamic Azad University, North Tehran Branch, Tehran
2 MSc Student of Marine Chemistry, Faculty of Marine Sciences and Technology, Islamic Azad University, North Tehran Branch, Tehran
3 Assist. Prof. of Chemistry, Faculty of Marine Sciences and Technology, Islamic Azad University, North Tehran Branch, Tehran
چکیده [English]

Removing pollutants from aquatic ecosystems, especially from drinking water, has always been a major concern for scientists. Recent decades have witnessed the widespread application of natural compounds used as adsorbents to remove various pollutants. On the other hand, studies have proved nanotechnology to be an effective way of removing pollutants. A new type of sponge belonging to the family Demospongiae that has nano holes and is native to the Persian Gulf was investigated for the first time in the present study for use as an adsorbent to remove calcium, magnesium, cobalt, cadmium, and lead ions from water. For this purpose, adbsorption in sponges of different aggregate sizes, contact time, particle size, and ambient pH were measured. The results showed that the proposed sponge is capable of adsorbing the above-mentioned metal ions to various degrees. While small amounts of calcium, magnesium, and cobalt were adsorbed by this sponge, cadmium recorded a higher adsorption of 2.37 mg/g at pH=5. The highest adsorption level of 79.19 mg per gram of adsorbent was recorded for lead at a pH range of 4.5-5 with a mesh size of 230. This is the highest adsorption ever recorded for lead in the literature on selective separation of lead from the other ions.

کلیدواژه‌ها [English]

  • sponge
  • Nano-adsorbent
  • the Persian Gulf
  • heavy metals
  • Scanning electron microscopy

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مجله آب و فاضلاب
دوره 26، شماره 2 - شماره پیاپی 2
پیاپی: 96
خرداد و تیر 1394
صفحه 2-12

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