Central Composite experimental design applied to removal of Methylen blue from aqueous solutions using semnan natural zeolite

The process optimization of decolorization methylen blue from aqueous solutions through semnan natural zeolite using statistical design of experiments (DOE) is reported in the present study.The natural zeolite was provided from semnan zeolite mine. The effect of four important process variables, Initial pH (3-9), amount of zeolite (0.3 – 1.0 gr , initial of dye concentration (30- 50ppm) and contact time (30-90 min) on the removal performance of the was studied. The response surface methodology (RSM) coupled with central composite design (CCD) was used to develop model to correlate the effect of process variables to one response: (i) dye removal efficiency. The most influential factor on decolorization was identified using the analysis of variance (ANOVA). The interaction between the four variables was systematically investigated based on countor plots. The optimum operating condition for the process was determined by setting the optimization criteria to maximize the dye removal efficiency. The optimum dye removal efficiency of 99 percent was obtained at a initial pH of 6.01, amount of zeolite 0.65 , initial of dye concentration 40 ppm and contact time of 60 minute .

کلیدواژه ها:

Central Composite Design ، decolorization ، semnan natural zeolite ، Methylen blue