Optimization of Cu(II) Removal Using Aceh Natural Bentonite, Intercalated Bentonite and Pillared Bentonite Using Box– Behnken Design In Response Surface Methodology
Keywords:adsorption, bentonite, optimization, response surface methodology
Optimization of the Cu(II) removal by natural bentonite from Aceh through modification with NaCl intercalation and pillarization with AlCl3 in aqueous solution was conducted using Response surface methodology (RSM). Batch mode experiments were conducted based on a Box-Behnken Design in the RSM. Adsorption results were investigated as a function of two independent factors i.e. initial Cu(II) ions concentration (100-500 mg/L) and agitation time (30-120 min), bentonite mass of (2 g). The results of analysis of variance were obtained viz. the influence of the two independent variables viz. initial copper concentration and agitation time are very significant. Optimization equation were obtained for natural bentonite (NB), intercalated bentonite (IB) and pillared bentoned (PB). The optimization conditions for copper removal were obtained at 300 mg/L initial copper concentrations and 75.901 min of agitation times. The maximum Cu(II) adsorption capacity of the NB, IB and PB were 27.101, 27.568 and 28.969 mg/g respectively.