Comparative study on adsorption of basic blue 41 (bb41) dye from aqueous solution onto two sgos

Aysan Hassanzadeh Bavojdan1, Mohammad Reza Alavi Moghaddam1, Elaheh Kowsari2

1 Civil and Environmental Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., Tehran, 15875-4413, Iran
2 Department of Chemistry, Amirkabir University of Technology (Tehran Polytechnic), Hafez Ave., Tehran, 15875-4413, Iran

Abstract


The main purpose of the present research was a comparative study of two functionalized sulfonated graphene oxide (SGO) for removal of selected pollutant (Azo-Cationic Basic Blue 41 dye) in aqueous solution. The two nano-adsorbents (GO/1,4-butane sultone (SGO1) and GO/1,3-propane sultone (SGO2)) were synthesized, and characterized by Scanning Electron Microscope (SEM), Brunauer-Emmett-Teller (BET), X-ray Crystallography (XRD), Raman spectroscopic, and Fourier-Transform Infrared Spectroscopy (FTIR) analysis. The adsorption process of BB41 dye onto two nano-adsorbents was investigated. Selected parameters including initial solution pH, initial BB41 concentration, adsorbent dose, and contact time were evaluated. pH= 8, initial BB41 dye concentration= 50 and 100 mg/L, adsorbent dose= 0.2 and 0.15 g/L and contact time= 60 and 30 minute at room temperature, were the optimum values of the parameters for SGO1 and SGO2, respectively. The maximum adsorption capacity with SGO1 and SGO2 (assuming minimum removal of 80%) were found to be 274 and 434 mg/g. The study of isotherm and kinetics showed that both nano-adsorbents followed the Langmuir equilibrium model and were best fitted to the pseudo-second-order model. Moreover, according to the thermodynamic analysis the adsorption process, at all analyzed temperatures, was endothermic. The SGO2 nanoadsorbent had shown higher efficiency than the SGO1 nano-adsorbent during four cycles of the regeneration/ recovery investigation.

Keywords


dye adsorption; isotherm; process kinetic; sulfonated graphene oxide; thermodynamics

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