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In this study, we have used the potassium hydroxide (KOH) as an eco–friendly and favorable activating agent to develop the porous and defect structure of activated carbon. Otherwise, the response surface methodology (RSM) has been applied to investigate the effects of the adsorption parameters including initial concentration, adsorbent dosage, and pH of solution on the percentage of Cu 2+ removal. The RSM –based two order regression polynomial models were found to be statistically signicant by values of the coefficients of determination (R 2 ) closer than 1.0 and the P–values < 0.0001 from analysis of variance (ANOVA). Under the predicted optimum conditions, actual experiments were confirmed to optimize the percentage of Cu 2+ removal efficiency (97.5 %) and maximum adsorption capacity (24.45 mg.g –1 ) from Langmuir equation. Based on experimental results, a treatment process can be easily designed using rice husk for the fabrication of activated carbon to remove toxic metal ions from the polluted water.

A RESPONSE SURFACE METHODOLOGY APPROACH FOR THE OPTIMIZATION OF CU2+ REMOVAL USING RICE HUSK–DERIVED ACTIVATED CARBON