نانومقیاس

نانومقیاس

جذب یون سرب (II) توسط نانوکامپوزیت مغناطیسی مبتنی بر نانوسلولز استخراج‌شده از جلبک Chaetomorpha

نوع مقاله : مقاله پژوهشی

نویسندگان
1 بوشهر، دانشگاه خلیج فارس ، دانشکده علوم و فناوری نانو و زیستی
2 بوشهر، دانشگاه خلیج فارس ، دانشکده علوم و فناوری نانو و زیستی گروه شیمی
چکیده
چکیده: آلودگی آب‌ها با فلزات سنگین به ویژه سرب، یکی از مشکلات مهم زیست‌محیطی است که حذف آن مورد توجه پژوهشگران قرار دارد. در این مطالعه، نانوسلولز استخراج‌شده از جلبک کتومرفا روی نانوذرات مغناطیسی آهن (Fe3O4)تثبیت و جاذب مغناطیسی زیستی تهیه شد. عملکرد این جاذب در حذف یون سرب (II) از محلول‌های آبی در شرایط مختلف ( pH، غلظت یون، دما، مقدار جاذب و زمان تماس) بررسی شد. بیشترین میزان جذب معادل 2/5 میلی‌گرم سرب بر یک گرم جاذب بوده که در pH برابر با 5/2، غلظت اولیه 7 میلی‌گرم بر لیتر، دمای 45 درجه سانتی‌گراد، مقدار جاذب 0/018 گرم بر لیتر و زمان تماس 120 دقیقه حاصل می‌شود. افزایش pH تا مقدار بهینه جذب را افزایش داد، اما در مقادیر بالاتر به دلیل تشکیل رسوب هیدروکسید سرب، جذب کاهش یافت. افزایش دما تا 45 درجه سانتی‌گراد جذب را بهبود داد ولی دماهای بالاتر باعث آسیب به گروه‌های فعال جاذب شد. مطالعات نظری با محاسبات شیمی کوانتومی (DFT) نشان داد یون سرب با اکسیژن‌های حلقه سلولزی برهمکنش فیزیکی ایجاد کرده که پایداری جاذب را افزایش می‌دهد. نتیجه کلی اینکه، نانوسلولز-Fe3O4 زیست‌سازگار و مؤثری برای حذف یون سرب از آب است و ترکیب نتایج تجربی و نظری مسیر توسعه جاذب‌های نوین تصفیه آب را هموار می‌کند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Adsorption of Lead (II) Ions by a Magnetic Nano-composite Based on Nano-cellulose Extracted from Chaetomorpha Algae

نویسندگان English

Hadi Sahbandar-zadeh 1
Mahmoud Niad 1
Leila Maftoon-Azad 2
1 Faculty of Nanoscience and Bioscience Technology, Persian Gulf University, Bushehr
2 Department of Chemistry, Faculty of Nano and Bio Sciences and Technology, Persian Gulf University, Bushehr, Iran
چکیده English

Water contamination with heavy metals, especially lead, is one of the major environmental challenges that has attracted the attention of many researchers for removal. In this study, nano-cellulose extracted from Chaetomorpha algae was immobilized on magnetic iron nanoparticles (Fe₃O₄) to prepare a bio‑magnetic adsorbent. The performance of this adsorbent in removing lead (II) ions from aqueous solutions was investigated under various conditions including pH, ion concentration, temperature, adsorbent dosage, and contact time. The maximum adsorption capacity was 2.5 mg of lead per gram of adsorbent, obtained at pH 5.2, an initial concentration of 7 mg/L, temperature of 45 °C, adsorbent dosage of 0.018 g/L, and a contact time of 120 minutes. Increasing the pH up to the optimum value enhanced the adsorption efficiency, while at higher pH values, formation of lead hydroxide precipitates caused a reduction in adsorption. Increasing the temperature up to 45 °C improved adsorption, but higher temperatures damaged the functional groups of the adsorbent. Theoretical studies using quantum chemical (DFT) calculations revealed that lead ions interact physically with the oxygen atoms of the cellulose rings, which enhances the stability of the adsorbent. Overall, the Fe₃O₄–nano-cellulose composite is an eco‑friendly and effective material for lead ion removal from water, and the combination of experimental and theoretical results paves the way for the development of new water‑purification adsorbents.

کلیدواژه‌ها English

chaetomorpha algae
lead ion
Persian Gulf
computational chemistry
magnetic nano-particles
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دوره 12، شماره 3
پاییز 1404
صفحه 338-362

فایل‌های تکمیلی/اضافی

  • تاریخ دریافت 12 شهریور 1404
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