بررسی ایزوترم جذب گرافن اکساید اصلاح شده توسط دندریمرهای آلی برای حذف سم بوتاکلر از محیط آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه علوم محیط‌زیست، دانشکده منابع طبیعی و محیط‌زیست،دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

2 استاد، گروه مهندسی محیط‌زیست، دانشکده منابع طبیعی و محیط‌زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

3 استاد، گروه شیمی، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد تهران مرکزی، تهران، ایران

4 دانشیار، گروه شیمی و مهندسی شیمی، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد ورامین-پیشوا، ورامین، ایران

5 دانشیار، گروه علوم محیط‌زیست، دانشکده منابع طبیعی و محیط‌زیست،دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

چکیده

ورود علف‌کش‌ها به منابع تأمین آب شرب می‌تواند اثرات مخربی بر سلامت انسان و محیط‌زیست داشته باشد. بنابراین برای حفظ محیط‌زیست حذف آنها از محیط آبی امری ضروری است. بنابراین این پژوهش با هدف بررسی ایزوترم جذب گرافن اکساید اصلاح شده توسط دندریمرهای آلی برای حذف سم بوتاکلر از محیط آبی انجام شد. در این پژوهش گرافن اکساید مغناطیسی عامل‌دار شده به روش جذب پیوندهای کووالانسی تولید و به‌عنوان جاذب استفاده شد. مشخصات جاذب سنتز شده توسط FTIR، XRD، SEM و TEM آنالیز شد. همچنین تأثیر پارامترهای pH، زمان تماس، غلظت آلاینده، مقدار جاذب، دما و قابلیت استفاده مجدد بر ظرفیت جذب جاذب بررسی شد و شرایط بهینه تعیین شد. یافته‌های جذب به‌وسیله مدل‌های ایزوترم لانگمیر و فروندلیچ شرح داده شدند. نتایج نشان داد که گرافن اکساید مغناطیسی عامل‌دار شده به‌طور مؤثر سم بوتاکلر را جذب می‌کند و درصد جذب به‌طور قابل‌توجهی تحت تأثیر پارامتر‌های بررسی شده است. با افزایش زمان تا 45 دقیقه، افزایش pH تا مقدار5، افزایش مقدار جاذب تا 3 گرم بر لیتر و غلظت سم بوتاکلر تا 10 میلی‌گرم در لیتر و افزایش دما تا 25 درجه سلسیوس، مقدار جذب سم بوتاکلر تا 4/95 درصد افزایش یافته است. واجذب سم از دمای 37 تا 50 درجه سلسیوس افزایش یافته است و بعد از 10 بار استفاده مجدد از جاذب، مقدار جذب تنها 5/6 درصد کاهش یافت. جاذب در شرایط بهینه قادر به حذف 3/86 درصد از سم بوتاکلر در نمونه واقعی با انحراف استاندارد 06/6 درصد شد. ایزوترم لانگمیر فرایند جذب را به‌خوبی توصیف کرد (99/0=2R). نانوجاذب سنتز شده، یک جاذب کارآمد و توانمند و حساس به گرما برای حذف سم بوتاکلر از محیط آبی است.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Adsorption Isotherm of Modified Graphene Oxide by ‎Organic Dendrimers to Remove Butachlor Pecticides from Aqueous ‎Solution

نویسندگان [English]

  • Soha Nozhat 1
  • Amirhesam Hasani 2
  • Homayon Ahmad Panahi 3
  • Elham Moniri 4
  • Masoud Monavari 5
1 PhD. Student, Dept. of Environmental Science, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Prof., Dept. of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
3 Prof., Dept. of Chemistry, Faculty of Basic Science, Islamic Azad University, Central Tehran Branch, Tehran, Iran
4 Assoc. Prof., Dept. of Chemistry and Chemistry Engineering, Faculty of Basic Science, Islamic Azad University of Varamin-Pishva, Varamin, Iran
5 Assoc. Prof., Dept. of Environmental Science, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

The entry of herbicides into drinking water supply sources can have devastating effects on human health and the environment. Therefore, removal of them from the aquatic environment is essential, in order to preserve the environment. Therefore, this study was conducted with the aim to investigate the isotherm absorption of graphene oxide modified by organic dendrimers to remove Butachlor toxin from the aquatic environment. In the present study, operating magnetic graphene oxide was produced by absorption of covalent bonds and used as adsorbent. Synthetic adsorbent properties were analyzed by FTIR, XRD, SEM, TEM, TGA, VSM and EDS. Also, the effects of pH parameters, contact time, contaminant concentration, adsorbent amount, temperature and reusability on adsorption absorption capacity were investigated and optimal conditions were determined. The absorption results were described by Langmuir, Freundlich, Temkin and kinetic adsorption models by first-order and quasi-second-order models and thermodynamic equations. The results indicated that functionalized graphene oxide effectively absorbs Butachlor and absorption percentage is significantly affected by the examined parameters. By increasing the time to 45 minutes, increasing the pH to 5, increasing the amount of adsorbent to 3 g/L and the concentration of Butachlor toxin to 10 mg/L and increasing the temperature to 25 ⁰C, the rate of absorption of Butachlor toxin has increased to 95.4%. Toxin absorption increased from 37 to 50 ⁰C, and after ten re-uses of the adsorbent, the absorption rate decreased by only 6.5%. Under optimal conditions, the adsorbent was able to remove 86.3% of Butachlor toxin in the real sample with a standard deviation of 6.06%. The Langmuir isotherm described the absorption process well (R2 = 0.99). Synthesized nano-adsorbent is an efficient, powerful and heat-sensitive adsorbent for removing Butachlor from the aquatic environment.

کلیدواژه‌ها [English]

  • graphene oxide
  • Magnetic nanoparticles
  • Dendrimer
  • Butachlor
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