Removal of colored pollutants from aqueous solutions with a poly Schiff-base based on melamine-modified MWCNT

Publish Year: 1399
نوع سند: مقاله ژورنالی
زبان: English
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JR_AJGC-4-4_005

تاریخ نمایه سازی: 22 دی 1399

Abstract:

Carbon nanotubes (CNTs) have been extensively explored for adsorption applications due to their well-defined cylindrical hollow structure, large surface area, high aspect ratios, hydrophobic wall, and easily modified surfaces. In the present work, a poly Schiff-base was synthesized with capability to remove the dye pollutant from aqueous solutions. For this propose, firstly, multi-walled carbon nanotube (MWCNT) was modified with melamine, then the melamine-modified MWCNT was further reacted with 3-pyridinecarboxaldehyde to synthesize the final poly Schiff-base. The prepared adsorbent was employed to assess the removal of the dye pollutants from aqueous solutions and Congo red (CR) was selected as typical dye. Different adsorption parameters such as pH, adsorbent amount, initial concentration of the dye, and contact time were investigated and optimized. By adjusting these parameters, the adsorption percentage reached to the value of 92%. Moreover, the adsorption isotherms were studied and fitted with the Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) models. The kinetic studies were carried out by using the Lagergren pseudo-first-order and the Ho pseudo-second-order equations. The adsorbent was also characterized by FT-IR, TGA, and SEM techniques.

Authors

Somayeh Farajzadeh

Department of Organic Chemistry, Faculty of Chemistry, Urmia University, Urmia, Iran

Peyman Najafi Moghadam

Department of Organic Chemistry, Faculty of Chemistry, Urmia University, Urmia, Iran

Jabbar Khalafy

Department of Organic Chemistry, Faculty of Chemistry, Urmia University, Urmia, Iran

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