Adsorption removal of arsenic from Aqueous solution by carboxy methyl Cellulose(CMC) modified with montmorillonite
Zahra Moradi, Afshar Alihosseini, Azam Ghadami
Abstract
In this research, CMC/MMT nano composite was prepared using the free radical polymerization method and evaluated as Arsenic ions removal adsorption from an aqueous solution. We used the Design expert (CCD) to remove Arsenic Ions optimally. SEM, XRD and FTIR analyses were used to determine the adsorbent properties. The experimental design was done with four time variables (25–40min), Arsenic concentration (0.5–2 ppm), adsorbent dose (0.05-2gr) and pH (4–8). The interaction and combined effects of the variables were evaluated by the analysis of variance (ANOVA) table. A quadratic polynomial regression equation was developed to predict the response under optimal conditions. The results of kinetic studies and adsorption isotherms present that the kinetics of Arsenic ion adsorption by CMS/MMT adsorbent follows the quadratic equation and the Langmuir isotherm with a better correlation coefficient than the Freundlich equation. Furthermore, under optimal conditions (pH = 5.6, t = 34 min), 1.9 ppm Arsenic is adsorbed per 0.09 g of the adsorbent with 85% efficiency which indicates that the carboxymethyl cellulose hydrogel modified with Montmorillonite is a suitable adsorbent to remove Arsenic ions from aqueous solution.