تهیه و بررسی نانوکامپوزیت مغناطیسی کیتوسان/کاپا-کاراگینان و کاربرد آن در حذف رنگ اریوکروم بلاک تی

نوع مقاله: مقاله پژوهشی

نویسنده

دانشیار، آزمایشگاه تحقیقاتی پلیمر،گروه شیمی، دانشکده علوم پایه، دانشگاه مراغه، مراغه، ایران

چکیده

رنگ آلاینده‌ای است که به‌دلیل عدم تجزیه‌پذیری زیستی باعث آلودگی محیط‌زیست و آبهای سطحی می‌شود. پژوهش‌های زیادی به‌منظور حذف این مواد از فاضلاب‌ توسط فرایند جذب سطحی انجام شده است. در این پژوهش جاذب مغناطیسی بر پایه کیتوزان برای حذف رنگ آنیونی اریوکروم بلک تی تهیه و بررسی شد. نانوذرات مغناطیسی به‌صورت درجا در حضور کیتوسان تهیه شد و کیتوسان مغناطیسی به‌دست آمده با کاپا-کاراگینان شبکه‌ای شد تا مشکل انحلال آن در محیط اسیدی برطرف شود. ساختار نانوکامپوزیت مغناطیسی کیتوسان با استفاده از روش‌های معمول شامل XRD، SEM، TEM، FT-IR و VSM شناسایی شد. اثر عوامل مختلف از جمله غلظت رنگ، زمان تماس، pH محلول، دما و اثر نیروی یونی در جذب رنگ بررسی شد. نتایج آزمایش‌ها نشان داد که داده‌های جذب همدما به خوبی با همدمای لانگمیـر مطابقت دارد. حداکثر ظرفیت جذب جاذب تحت شرایط بهینه بر مبنـای ایزوتـرم لانگمیـر 150 میلی‌گرم بر گرم بود. سینتیک جذب اریوکروم بلاک تی برروی نانو کامپوزیت مغناطیسی با مدل شبه درجه دوم مطابقت داشت. با افزایش pH مقدار جذب سطحی رنگ بر روی کیتوسان مغناطیسی کاهش یافت. با توجه به روش تهیه آسان جاذب مغناطیسی کیتوسان و راندمان جذب بالای آن برای رنگ اریو کروم بلاک تی می‌توان این نمونه جاذب را برای مصارف کاربردی پیشنهاد داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Preparation and Characterization of Magnetic Chitosan/-Carrageenan Nanocomposite and its Application for Removal of Eriochrome black-T from Aqueous Solutions

نویسنده [English]

  • Gholam Reza Mahdavinia
Assoc. Prof., Faculty of Sciences, Maragheh University, Maragheh, Iran
چکیده [English]

Due to the non-biodegradability of some dyes especially water soluble dyes, dye can pollute surface and groundwaters. Subsequently, discharging dye-contaminated wastewaters in the environment can endanger the human and aquatic life. In this work, a chitosan-based magnetic adsorbent was used for removal of anionic eriochrome black T. Magnetic nanoparticles were synthesized in situ in the presence of chitosan. The obtained magnetic chitosan was then crosslinked with kappa-carrageenan in order to overcome the solubility of chitosan under acidic conditions. The structure of magnetic adsorbent was investigated by XRD, SEM, TEM, FT-IR, and VSM techniques. The removal of eriochrome black T by magnetic adsorbent was studied regarding dye concentration, pH, temperature, ionic strength, and contact time. The experimental adsorption isotherms were in good accordance with the Langmuir model. According to the Langmuir constants, the maximum adsorption capacity of magnetic adsorbent was acquired 150 mg/g. The adsorption kinetic data were properly described according to the pseudo-second-order kinetic model. A decrease in dye adsorption capacity of the adsorbent was observed as the pH of dye solution was increased. The ease of preparation for magnetic adsorbent and its high adsorption capacity for eriochrome black T makes it a good candidate for removal of pollutants.

کلیدواژه‌ها [English]

  • Magnetic
  • Chitosan
  • κ- Carrageenan
  • Eriochrome Black-T
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