Removal of colored pollutants from aqueous solutions with a poly Schiff-base based on melamine-modified MWCNT
محل انتشار: نشریه آسیایی شیمی سبز، دوره: 4، شماره: 4
سال انتشار: 1399
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 176
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شناسه ملی سند علمی:
JR_AJGC-4-4_005
تاریخ نمایه سازی: 22 دی 1399
چکیده مقاله:
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.
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نویسندگان
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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