حذف رنگ‌زای ری‌اکتیو با استفاده از نانوکامپوزیت مغناطیسی پلیمری از محلول آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه منابع آب، دانشکده محیط‌زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

2 استادیار، گروه شیمی، دانشکده علوم پایه، واحد ورامین- پیشوا، دانشگاه آزاد اسلامی، ورامین، ایران

3 دانشیار، گروه شیمی، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد ورامین- پیشوا، ورامین، ایران

4 دانش‌آموخته مهندسی محیط‌زیست، دانشکده محیط‌زیست، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

چکیده

آلاینده‌های رنگی حاصل از صنایع مختلف به‌دلیل سمّی بودن و تجزیه‌ناپذیری تهدیدی جدی برای سلامت انسان و محیط‌زیست به‌شمار می‌روند. در این پژوهش، یک نانوکامپوزیت مغناطیسی اصلاح شده با پلی‌اتیلن‌ ایمین (PEI/MGO) سنتز شد و به‌عنوان جاذب برای حذف سریع، مؤثر و اقتصادی یک رنگ‌زای ری‌اکتیو از محلول آبی به‌کار رفت. کارایی PEI/MGO در حذف رنگ‌زای ری‌اکتیو از محلول آبی به‌روش جذب سطحی در یک سامانه‌ ناپیوسته بررسی شد. ویژگی‌های سطحی PEI/MGO با FESEM شناسایی شد. جذب رنگ‌زا روی جاذب با طیف‌بینی FTIR تأیید شد. داده‌های تجربی جذب سطحی با مدل‌های سینتیکی شبه‌مرتبه اول و دوم به‌‌روش رگرسیون خطی برازش شد. مدل‌های لانگمیر و فروندلیچ برای توصیف هم‌دماهای تعادلی جذب به‌کار برده شدند. ظرفیت جذب سطحی با pH ارتباط عکس و با زمان تماس، دما و غلظت اولیه رنگ‌زا ارتباط مستقیم داشت. درصد حذف رنگ‌زا با استفاده از نانوکامپوزیت سنتزی در pH برابر 3، زمان تماس 45 دقیقه، و دمای 328 درجه سلسیوس بیش از 3±90 درصد بود. فرایند جذب از مدل سینتیکی شبه‌مرتبه دوم و مدل هم‌دمای فروندلیچ پیروی کرد. حداکثر ظرفیت جذب سطحی PEI/MGO در دمای 298 درجه سلسیوس، 33/208 میلی‌گرم بر گرم به‌دست آمد. بنابراین نتایج، جاذب سنتزی توانایی بالقوه مطلوبی برای حذف رنگ‌زای ری‌اکتیو از محلول آبی دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Removal of Reactive Dye Using a Magnetic Polymer Nanocomposite from Aqueous Solution

نویسندگان [English]

  • Reza Haji Seyed Mohammad Shirazi 1
  • Mahsa sadat Miralinaghi 2
  • Elham Moniri 3
  • Seyed Ehsan Rokni 4
1 Assist. Prof., Dept. of Environmental Engineering, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Assist. Prof., Dept. of Chemistry, Vramin-Pishva Branch, Islamic Azad University, Varamin, Iran
3 Assoc. Prof., Dept. of Chemistry, Vramin-Pishva Branch, Islamic Azad University, Varamin, Iran
4 MSc Graduated of Environmental Engineering, Dept. of Environmental Engineering, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

Dye pollutants from numerous industries, due to the highly toxic and non-biodegradability, pose a great threat to the human health and environment. In this research, a magnetic nanocomposite modified with polyethyleneimin (PEI/MGO) was synthesized and used as an adsorbent for rapid, efficient and economic removal of reactive dye. Performance of PEI/MGO for the adsorption of reactive dye from aqueous solution was studied by adsorption method in a batch system. Surface properties of PEI/MGO adsorbent were identified by an FE-SEM technique. Adsorption of dye onto adsorbent was confirmed on the basis FTIR analysis. The adsorption experimental data were fitted by pseudo-first-order kinetic and pseudo-second-order kinetic models by linear regression analysis. Langmuir and Freundlich models were used to describe the adsorption equilibrium isotherms. The adsorption capacity was inversely correlated with the initial pH solution while it was directly correlated with the contact time, temperature, and initial concentration of dye. The percentage removal of dye using synthesized nanocomposite was more than 90±3% at pH=3, contact time of 45 min, and temperature of 328 °C. The adsorption process followed pseudo-second-order kinetic and the Freundlich isotherm models. The maximum adsorption capacity of PEI/MGO was 208.333 mg/g at 298 °C. Based on the results of the experiments, the synthesized adsorbent represents a significant potential for removal of reactive dye from aqueous solution.

کلیدواژه‌ها [English]

  • Nanocomposite
  • Dye removal
  • Adsorption
  • Magnetic separation
  • linear method
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