Adsorption modeling and optimization of crystal violet a cationic dye in batch reactor

Document Type : Research Article


1 deportment of environmental technology, environmental science research institute, shahid beheshti university, Tehran, Iran

2 Prof., Environmental Sciences Research Institute, Shahid Beheshti University, G.C., Tehran, Iran


Graphene oxide nano-sheets were synthesized using modified Hummer’s method and characterized using Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), and Fourier Transform Infra-Red (FTIR) analyses. Response surface methodology (RSM) was used to optimize the effects of the effective factors including pH (4-9), adsorbent dosage (0.05-0.4 g/L), initial dye concentration (50-400 mg/L), and temperature (10-40 C°) in batch adsorption reactor. The adsorption capacity of graphene oxide and removal percentage of crystal violet in the optimum condition (pH of 7.4, the adsorbent dosage of 0.19 g/L, the initial concentration of 100 mg/L, and temperature of 30.4 C°) were predicted by the polynomial regression model to be 474 mg/g and 90%, respectively. Dye initial concentration and the adsorbent dosage with 51.6 and 41.7% respectively, showed the most percentage of contribution among the effective factors. Adsorption kinetic was investigated using pseudo-first order, pseudo-second order, and intraparticle diffusion kinetic models. Adsorption isotherm also was studied using Freundlich and Langmuir isotherm models. Results demonstrated the high correlation of adsorption kinetic and isotherm with pseudo-second order and Langmuir models respectively. In addition, the thermodynamic study indicated the endothermic and spontaneous nature of adsorption.


Main Subjects

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