Abstract

RANJAN, Deeksha et al. Optimization of brómate adsorption onto Fe-CNTs nanocomposite using response surface methodology. Water SA [online]. 2021, vol.47, n.4, pp.423-429. ISSN 1816-7950.  https://doi.org/10.17159/wsa/2021.v47.i4.3873.

This study was aimed at employing response surface methodology (RSM) for optimization of process variables and identifying optimal conditions for the adsorption of bromate (BrO₃^-) from contaminated water using multi-walled carbon nanotubes, based on iron hydr(oxide), Fe-CNTs nanocomposite. Fifteen experimental runs were conducted in batch mode to study the effect of individual as well as interactive process variables, i.e., pH, BrO₃^- initial concentration, and adsorbent dose, on the removal of BrO₃^- using Box-Behnken design (BBD) of RSM. The coefficient of determination (R²) at 98.34% indicated a good agreement between actual and predicted values. The main effect and contour plot were drawn to obtain the independent and interactive effect of operational variables on BrO₃^- uptake. A process optimization curve was drawn to determine the optimum operating conditions that lead to a desirable response. The optimum conditions for BrO₃^- adsorption using Fe-CNTs nanocomposite were found to be pH 2.0, initial BrO₃^- concentration of 10.0 mg/L, and adsorbent dose of 0.010 g per 50 mL solution.

Keywords : Fe-CNTs nanocomposite; BrO₃^-, adsorption; Box-Behnken design; optimization.

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