استفاده از نانوذرات آهن در سنتز هیدروژل مهره‌های مغناطیسی جهت حذف رنگزای بازیک آبی 159 از محیط‌های آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد مهندسی شیمی نساجی، عضو باشگاه پژوهشگران جوان و نخبگان، دانشگاه آزاد اسلامی واحد یادگار امام خمینی (ره) شهر ری، تهران، ایران

2 استادیار و عضو هیئت علمی گروه نساجی، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی واحد یادگار امام خمینی (ره) شهر ری، تهران، ایران

چکیده

رنگ‌ها از جمله آلاینده‌های اصلی موجود در فاضلاب‌های صنایع نساجی می‌باشند که به‌دلیل ساختار پیچیده مولکولی، غالباً سمی و سرطانزا بوده و در محیط زیست پایدار می‌باشند. بنابراین هدف اصلی این پژوهش بررسی کارایی حذف رنگ بازیک آبی 159 (BB159) از محیط‌های آبی توسط هیدروژل مهره‌های مغناطیسی آلجینات سدیم بود. ابتدا هیدروژل مهره‌های مغناطیسی آلجینات سدیم بر اساس روش راچر و با استفاده از CaCl2 به‌عنوان کراس‌لینک کننده، سنتز شدند. سپس گروه‌های فعال موجود در سطح مهره‌های مغناطیسی تولید شده توسط طیف‌سنجی مادون قرمز تبدیل فوریهمورد مطالعه قرار گرفت. خواص مغناطیسی مهره‌ها توسط مغناطیس‌سنج نمونه ارتعاشیاندازه‌گیری و پارامترهای مغناطیسی محاسبه شد. اثر پارامترهای مختلف از جمله مقدار جاذب،pH ، غلظت اولیه رنگزا و زمان تماس در میزان حذف رنگزای 159BB  توسط این جاذب مورد بررسی قرار گرفت. ایزوترم جذب رنگزای 159BB  بر روی هیدروژل مهره‌های مغناطیسی آلجینات سدیم توسط مدل‌های لانگمیر، فروندلیچ، تمکین و بی.ای.تی بررسی شد. با توجه به‌ نتایج به‌دست آمده می‌توان دریافت که مهره‌های مغناطیسی آلجینات سدیم دارای گروه‌های -COO و- OH  بوده که در جذب رنگزای 159BB  با بار مثبت، نقش شایانی دارند. مقدار مغناطش اشباع برای مهره‌های آلجینات سدیم/ نانو ذرات آهن emu/g8/21 به‌دست آمد. نتایج نشان داد که بیشترین میزان حذف رنگزا از محلول رنگی در pH برابر 11، مدت زمان 120 دقیقه و مقدار 9 گرم جاذب صورت گرفته است. از نتایج به‌دست آمده می‌توان دریافت که حذف رنگزای مذکور از مدل لانگمیر تبعیت می‌کند. نتایج این تحقیق نشان داد که هیدروژل مهره‌های مغناطیسی آلجینات سدیم دارای راندمان قابل قبولی (85 درصد) برای حذف رنگزای 159BB از محیط‌های آبی می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Iron Nanoparticles (Fe3O4) Used to Synthesize Magnetic Sodium Alginate Hydrogel Beads for the Removal of Basic Blue 159 from Aqueous Solutions

نویسندگان [English]

  • Atiyeh Ghajarieh 1
  • Khosro Farizadeh 2
  • Mohsen Hosseinkhani 2
1 MSc in Textile Chemistry Engineering, Young Researchers and Elite Club, Faculty of Engineering, Yadegar-e-Emam Khomeini (RAH) Shahr-e Ray Branch, Islamic Azad University, Tehran, Iran
2 Assist. Prof. of Textile Engineering, Dept. of Engineering, Yadegar-e-Emam Khomeini (RAH) Shahr-e Ray Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

Dyes are a main source of pollutants in textile plant effluents. Due to their molecular structure, they are usually toxic, carcinogenous, and persistent in the environment. The aim of the present work was to explore the removal of basic blue159 (BB159) using magnetic sodium alginate hydrogel beads. Magnetic sodium alginate hydrogel beads were initially synthesized  accoriodng to Rocher method using CaCl2 as a crosslink agent. Fourier transform infrared spectroscopy (FTIR) was then employed to examine the functional groups on the surface of the magnetic sodium alginate hydrogel beads. In a third stage, the magnetic properties of the beads were measured using a vibrating sample magnetometer (VSM) and the magnetic parameters were calculated. Subsequently, the effects of such parameters as adsorbent dosage, pH, initial concentration of dye, and contact time were evaluated on the BB159 removal efficiency of the adsorbent used. Finally, the Langmuir, Freundlich, Temkin, and B.E.T models were exploited to study the adsorption isotherm of BB159 onto the magnetic sodium alginate hydrogel beads. It was found that the magnetic sodium alginate beads possess both –COO and –OH groups that play important roles in the adsorption of the positively charged BB159 dye. A saturation magnetization equal to 21/8(emu/g) was obtained for the sodium alginate beads/nano Fe3O4. Results also revealed that the highest dye removal from aqueous solutions was achieved at pH=11 in 120 minutes for 9 grams of the adsorbent. The study indicated that BB159 removal using the magnetic sodium alginate hydrogel beads as the adsorbent obeys the Langmuir model. Moreover, it was shown that the efficiency of the process for BB159 removal from aqueous solutions was satisfactory (85%).

کلیدواژه‌ها [English]

  • Magnetic Hydrogel Beads
  • Sodium Alginate
  • Basic Blue 159
  • Aqueous solution
  • Adsorption Isotherm
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