حذف آلاینده رنگزای سافرانین با استفاده از نانوکامپوزیت‌های اکسید گرافن، کربن فعال، نانو ذرات هیدروکسید آلومینیم و اکسید گرافن، کربن فعال و نانوذرات اکسید سریم

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه شیمی، واحد شهر قدس، دانشگاه آزاد اسلامی، تهران، ایران، صندوق پستی: 18899-14579

چکیده

در این پژوهش به منظور بررسی نقش نانوذرات در حذف آلاینده رنگزای کاتیونی سافرانین، سه جاذب زیر سنتز و مشخصه‌یابی شده است: نانو کامپوزیت اکسید گرافن با کربن فعال (GO-AC) به‌عنوان نمونه شاهد، اکسید گرافن با کربن فعال و نانو ذره هیدروکسید آلومینیم (GO-AC-Al(OH)3NPS) و اکسید گرافن با کربن فعال و نانو ذره اکسید سریم (GO-AC-CeO2NPS). مشخصه‌یابی سه نانوکامپوزیت سنتز شده به عنوان جاذب که شامل (GO-AC)، (GO-AC-Al(OH)3NPS) و (GO-AC-CeO2NPS) می‌باشد، با تجزیه و تحلیل طیف‌سنجی زیر قرمز تبدیل فوریه، پراش پرتو X، میکروسکوپ الکترونی روبشی ، آنالیز عنصری و قطر هیدرودینامیکی مشخص شد. اثر عوامل مختلف مانند pH، غلظت اولیه رنگزا، مقدار جاذب، زمان تماس و دمای آنالیت در فرآیند جذب رنگزای سافرانین بررسی شد. اکسید گرافن، کربن فعال و نانو ذره اکسید سریم و هیدروکسید آلومینیم به علت داشتن حفرات و گروه‌های عاملی متفاوت می‌توانند با تشکیل انواع برهم‌کنش‌های الکترواستاتیک،  π-πو پیوندهای هیدروژنی در جذب رنگزای سافرانین موثر باشند. سازوکارهای اثرگذار بر حذف آلاینده‌ها با مدل‌های ایزوترمی فرندلیچ و لانگمویر مطالعه شد که نتایج نشان داد حذف رنگزای سافرانین از ایزوترم فرندلیچ تبعیت می‌کند و مقدار ضریب همبستگی R2 برای نانوکامپوزیت‌های (GO-AC)، (GO-AC-CeO2NPS) و (GO-AC-Al(OH)3NPS) به ترتیب 0.973، 0.986 و 0.999 به دست آمده است. بیشینه ظرفیت جذب به دست آمده برای سه کامپوزیت GO-AC، GO-AC-CeO2 NPS و GO-AC-Al(OH)3NPS به ترتیب 7.917، 9.847 و 9.197 میلی‌گرم بر گرم می‌باشد. نانوکامپوزیت‌های تهیه شده از نانو ذرات سریم اکسید و هیدروکسید آلومینیم عملکرد بالایی در حذف رنگزای سافرانین نسبت به جاذب شاهد (GO-AC) از خود نشان دادند.

کلیدواژه‌ها

عنوان مقاله [English]

Removal of Safranin Dye Using Graphene Oxide, Activated Carbon Nanocomposites, Aluminum Hydroxide and Oxide Graphene Nanoparticles, Activated Carbon and Cerium Oxide Nanoparticles

نویسندگان [English]

  • Omid Moradi
  • Solmaz Maraghe
  • Samira Arab-Salmanabadi
Department of Chemistry, Faculty of Science, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

In this research, the following three adsorbents were synthesized and characterized to investigate the role of nanoparticles in the removal of the cationic dye safranin: a nanocomposite of graphene oxide-activated carbon (GO-AC) as a blank sample, graphene oxide-activated carbon-aluminum hydroxide nanoparticle (GO-AC-Al(OH)3 NPS) and graphene oxide-activated carbon-cerium oxide nanoparticles (GO-AC-CeO2 NPS). The synthesized nanomaterials were identified and characterized by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), dynamic light scattering (DLS), and energy-dispersive X-ray spectroscopy (EDX). The effect of various parameters such as pH, initial dye concentration, adsorbent amount, contact time, and temperature in the safranin dye adsorption process was investigated. The used nanoparticles have a high surface area, good mechanical strength, and different functional groups. Graphene oxide, activated carbon, nanoparticles of cerium oxide, and aluminum hydroxide can be effective in the adsorption of safranin dye by forming various electrostatic interactions, π-π, and hydrogen bonds due to their different cavities and functional groups. Mechanisms affecting the removal of contaminants were studied with the Freundlich and Langmuir isotherm models. The results showed that the removal of safranin dye followed the Freundlich isotherm, and the value of the R2 correlation coefficient for oxide graphene /activated carbon, oxide graphene/activated carbon/cerium oxide, and oxide graphene /activated carbon/aluminum hydroxide were obtained 0.973, 0.986 and 0.9994, respectively. The synthesized nanocomposites from cerium oxide and aluminum hydroxide nanoparticles showed good performance in removing safranin dye as compared to the blank sample (GO-AC).

کلیدواژه‌ها [English]

  • Dye removal
  • Safranin
  • Isotherm
  • Nanocomposite
  • Graphene oxide
  • Cerium oxide nanoparticles
  • Aluminum hydroxide nanoparticles

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