Simultaneous adsorption of cationic and anionic dyes using a novel multifunctional mesoporous silica
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_AMECJ-4-1_004
تاریخ نمایه سازی: 14 آذر 1402
Abstract:
In the present work a multifunctional nanoadsorbent was synthesized
via a well-designed stepwise route, led to the grafting of an amine
group on the interior and acidic sites on the exterior of bimodal
mesoporous silica nanoparticles (UVM-۷). First, amine and thiol
groups were grafted on the interior and exterior pores of silica
through co-condensation and post synthesis treatment, respectively.
Then, the oxidation of thiol on UVM-۷ caused to create sulfonic
acid and the subsequent template extraction was carried out to obtain
the NH۲/UVM-۷/SO۳H. The results of XRD, the nitrogen sorption,
SEM, TEM, FT-IR and elemental analysis revealed the presence
of both types of functional groups on UVM-۷. Then, simultaneous
adsorption of anionic and cationic dyes (Methylene Blue [MB] and
Direct Red ۲۳ [Dr]) using NH۲/UVM-۷/SO۳H was investigated. UVVis
spectrophotometry was utilized for the determination of dyes in
single and binary solutions. Langmuir and Freundlich models were
used for the fitting of obtained experimental adsorption data and the
constants of both isotherms were calculated for MB and Dr. Morover,
the calculation of thermodynamic parameters revealed that the
adsorption of MB and Dr on NH۲/UVM-۷/SO۳H was endothermic
and spontaneous. Furthermore, the simultaneous adsorption of both
dyes regardless of their different electrostatic charge is the main
characteristics of NH۲/UVM-۷/SO۳H which was specially used for
treatment of industrial wastewater.
Keywords:
Authors
Amir Vahid
Research institute of petroleum industry, Tehran, Iran
Majid Abdouss
Faculty of chemistry, Amirkabir University of Technology, Tehran, Iran
Shahnaz Nayeri
Faculty of chemistry, Amirkabir University of Technology, Tehran, Iran
Aliakbar Miran Beigi
Research institute of petroleum industry, Tehran, Iran