سنتز جاذب گرافن اکساید و گرافن اکساید عاملدار با استفاده از روش هامرز اصلاح شده به‌منظور جذب سرب محلول‌های آبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه فیزیک، واحد مرودشت، دانشگاه آزاد اسلامی، مرودشت، ایران

2 دانشیار، گروه فیزیک، واحد مرودشت، دانشگاه آزاد اسلامی، مرودشت، ایران

3 استادیار، پژوهشکده چرخه سوخت هسته‌ای، پژوهشگاه علوم و فنون هسته‌ای، سازمان انرژی اتمی ایران، تهران، ایران

4 استادیار، گروه فیزیک، دانشگاه ملایر، ملایر، ایران

5 دانشیار، گروه برق- الکترونیک، واحد مرودشت، دانشگاه آزاد اسلامی، مرودشت، ایران

چکیده

یکی از مهم‌ترین چالش‌های محیط‌زیستی دنیا، آلودگی محیط‌زیست به فلزات سنگین سمّی و خطرناک است که موجب بروز اثرات محیط‌زیستی گوناگونی می‌شود. سرب یکی از فلزت سنگین است که حذف آن با روش‌های مختلفی انجام می‌شود. در این پژوهش، جاذب گرافن اکساید با روش هامرز اصلاح شده تهیه شد و با آمینومتیل فسفنیک اسید عاملدار شده و کاربرد آن در جذب یون‌های سرب از محلول‌های آبی در فرایند ناپیوسته بررسی شد. اثر پارامترهای مؤثر بر میزان جذب یون‌های سرب توسط جاذب تهیه شده از قبیل زمان تماس، pH، مقدار جاذب، غلظت اولیه محلول سرب و دمای محلول محاسبه شد. داده‌های سینتیکی با سه مدل شبه‌مرتبه اول، شبه‌مرتبه دوم و دو نمایی آنالیز شد. نتایج نشان دادند که داده‌های آزمایشگاهی تطابق بهتری با مدل شبه‌مرتبه دوم دارد. دو مدل ایزوترم هم‌دمای فروندلیچ و لانگمیر برای توصیف داده‌های تعادلی استفاده شد. حداکثر میزان جذب یون سرب توسط جاذب گرافن اکساید و گرافن اکساید عاملدار شده به‌ترتیب 80/187 و 41/209 میلی‌گرم در گرم در دمای 45 درجه سلسیوس و pH برابر 2 به‌دست آمد. علاوه بر این، جاذب‌ها توسط محلول اسید نیتریک/اسید هیدروکلریک، احیا شدند و در 7 چرخه جذب-دفع استفاده شدند که تغییر چندانی در ظرفیت جذب مشاهده نشد.

کلیدواژه‌ها


عنوان مقاله [English]

Synthesis of Graphene Oxide and Functionalized Graphene Oxide Using Improved Hummers Method for the Adsorption of Lead from Aqueous Solutions

نویسندگان [English]

  • Farzad Vaziri Alamdarlo 1
  • Ghahraman Solookinejad 2
  • Fazel Zahakifar 3
  • Masoud Rezvani Jalal 4
  • Masoud Jabbari 5
1 PhD Candidate, Dept. of Physics, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
2 Assoc. Prof., Dept. of Physics, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
3 Assist. Prof., Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
4 Assist. Prof., in Atomic and Molecular Physics, Dept. of Physics, Malayer University, Malayer, Iran
5 Assoc. Prof., Dept. of Electrical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
چکیده [English]

One of the most important environmental challenges in the world is environmental pollution with toxic and dangerous heavy metals, which causes various environmental effects. Lead is a heavy metal that can be removed in a variety of methods. In this study, graphene oxide adsorbent was prepared by modified Hummers method and functionalized with aminomethyl phosphonic acid and its application for the adsorption of lead ions from aqueous solutions in a batch sorption process was investigated. The effect of several batch adsorption parameters such as contact time, pH, adsorbent dose, initial concentration and temperature were investigated. The kinetic data were analyzed by Pseudo-first-order, Pseudo-second-order and Double- exponential kinetic models. The results showed that experimental data was fitted well by Pseudo-second-order kinetic model. The Freundlich and Langmuir isotherm models were applied to describe the equilibrium data. The maximum adsorption capacity of lead ions with graphene oxide and functionalized-graphene oxide adsorbents was found to be 187.80 and 209.41 mg/g at a pH of 2.0 and temperature of 45 ºC, respectively. Furthermore, the graphene oxide and functionalized-graphene oxide adsorbents were regenerated by HCl/HNO3 solution and the adsorption capacity did not change remarkably after seven adsorption-desorption cycles.

کلیدواژه‌ها [English]

  • functionalized graphene oxide
  • Aminomethylphosphonic Acid
  • Aqueous solution
  • Lead
  • Adsorption capacity
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