حذف سرب از محلول های آبی با استفاده از نانوگرافن اکسید اصلاح‌شده با ملامین

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه محیط‌زیست، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران

2 کارشناسی ارشد، گروه محیط زیست. دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، ایران

10.22034/jewe.2021.269866.1504

چکیده

در سال­های اخیر روش­های مختلفی برای حذف فلزات سنگین از محیط­های آبی به‌کاربرده می­شود که فرایند جذب سطحی یکی از آن‌ها است. نانو ذرات گرافن اکسید به علت ظرفیت جذب و سطح ویژه بالا بسیار موردتوجه و استفاده قرارگرفته است. در این پژوهش از جاذب نانوگرافن اکسید اصلاح­شده به­وسیله ملامین برای حذف فلز سنگین سرب از محیط آبی استفاده شد. آزمایش­ها در محدوده pH (3-8)، دما ( °C50-15)، غلظت سرب (mg/l 200-5)، مقدار جاذب (g/l 06/0- 01/0) و زمان تماس (min 150-15) انجام شدند. یافته­ها نشان داد حداکثر راندمان جذب سرب به­وسیله نانوگرافن اکساید اصلاح‌شده در شرایط 6=pH، غلظت mg/l 20، زمان تماس min 60، دمای محیط °C 22 و جرم جاذب g/l 01/0 رخ داد. در بررسی ایزوترم­های تعادلی فلز مدل فروندلیچ دارای تطابق بیش­تری با داده­های آزمایش داشت. با توجه به اینکه مدل فروندلیچ برای توصیف سطوح ناهمگن جاذب است. می­توان نتیجه گرفت جذب سرب به‌وسیله نانوگرافن اکسید به‌صورت چندلایه انجام‌گرفته است. نانوگرافن اکسید اصلاح‌شده با دارا بودن مساحت سطح بسیار زیاد، آب‌گریز بودن، چگالی بار منفی بالا، سادگی ساخت و جذب بالا به‌عنوان یک جاذب مؤثر برای حذف فلزات را می­توان به‌کاربرد. با توجه به نتایج این پژوهش از جاذب نانوگرافن اکسید اصلاح­شده با ملامین با کارایی بالای 8/98 % برای حذف سرب از محلول­های آبی می­توان استفاده کرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Removal of Pb Ions from Aqueous Solutions Using Melamine Modified Nanographene Oxide

نویسندگان [English]

  • Hassan Rezaei 1
  • Nazanin Parsa 2
1 Assoc. Professor, Department of Environment, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2 M.Sc., Department of Environment, Faculty of Fisheries and Environment, Environmental Pollution. Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
چکیده [English]

In recent years, various methods have been used to remove heavy metals from aquatic environments; one of which is the adsorption process. Graphene oxide nanoparticles have received much attention due to their high adsorption capacity and high surface area. In this study, melamine-modified nanographene oxide adsorbent was used to remove Pb from aqueous solution. Experiments were performed at pH (3-8), temperature (15-50 °C), Pb concentration (5-200) mg/l, adsorbent (0.01-0.06 g), and contact time (15-150 min). Results showed that the maximum Pb adsorption efficiency by modified nanographene oxide occurred at pH = 6, concentration of 20 mg/l, contact time of 60 min, ambient temperature of 22 °C and adsorbent dosage of 0.01 g. In the study of metal equilibrium isotherms, the Freundlich model was more consistent with the experimental data. Given that the Freundlich model is used to describe heterogeneous adsorbent surfaces, it can be concluded that lead adsorption by graphene oxide nanoparticles has been done in several layers. Modified nanographene oxide with its large surface area, hydrophobicity, high negative charge density, ease of fabrication and high adsorption could be used as an effective adsorbent for metal removal. According to the results of this study, a melamine-modified nanographene oxide adsorbent with a high efficiency of 98.8% can be used to remove lead from aqueous solutions.

کلیدواژه‌ها [English]

  • Adsorption
  • Equilibrium Isotherms
  • graphene oxide
  • Lead
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