Investigation of simultaneous removal of Basic Orange 2 dye and Ni(II) from aqueous solutions by modified nanoclay in continuous washing system using response surface methodology (RSM)

Subject Areas :

Armin Geroeeyan ¹ ( PhD Student of Analytical Chemistry, Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran. )
Ali Niazi ² ( Professor of Analytical Chemistry, Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran. )
Elaheh Konoz ³ ( Associate Prof. of Analytical Chemistry, Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, Iran. )

Received: 2021-11-11 Accepted : 2021-12-19 Published : 2022-11-22

Keywords: response surface methodology, Ni(II), Montmorillonite nanoclay, Basic Orange 2, Continuous washing system,

Abstract :

In the present study, the removal of Basic Orange 2 (BO2) dye and Ni(II) from aqueous solutions was studied using modified montmorillonite nanoclay (MMT). To characterize the adsorbent, FESEM and EDX-MAP analyses were performed. The process of the removal of pollutants was investigated through the designing and fabrication of the continuous washing system and the effect of important variables influencing the process such as concentration of dye and Ni(II), pH, length of column and the number of washing cycles was evaluated. Response surface methodology (RSM) using central composite design (CCD) has been applied to study the influence of experimental factors on the simultaneous removal of BO2 dye and Ni(II) in continuous system and the interaction of the variables were scrutinized through response surface curves. According to RSM results and optimization of simultaneous removal of BO2 dye and Ni(II) using desirability function, the optimal values for the five variables of dye concentration, Ni(II) concentration, pH, length of column, and number of washing cycles were found 12.07 mg L-1, of 12.97 mg L-1, 8.18, 12.97 cm and 2, respectively. The results of the removal of BO2 dye and Ni(II) in continuous washing system using modified montmorillonite nanoclay showed that this method can be efficient for the adsorption of pollutants from aqueous solutions.

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