Study of Factors Affecting Methylene Blue Adsorption on Ethyl Acetate-Modified MCM-41 Using Full Factorial Design
Keywords:
adsorption, MCM-41, methylene blue, experimental designAbstract
This research aims to modify MCM-41 using ethyl acetate to increase methylene blue adsorption efficiency by varying molar ratios of EtAc:SiO2 were 1.88, 2.50, 3.77, 5.63, and 7.54, respectively. Among molar ratios were studied, EtAc:SiO2 = 2.50 adsorbed the highest amount of methylene blue (25 ppm initial concentration) i.e. 19.12 mg/g adsorbent. Molar ratios of CTAB:SiO2 were varied from 0.33 and 1.24. However, it was found CTAB:SiO2 did not insignificantly affect methylene blue adsorption capacities. Then MCM-41 (CTAB 0.33 EtAc 2.5) was studied factors affecting methylene blue adsorption capacities (q), such as concentration of methylene blue ([MB]), pH, time, and temperature (Temp), were also investigated using full factorial design with Minitab. The results showed that main effect of factors were [MB], pH and Temp, and second-order interaction were [MB]*pH and pH*Temp. The importance of factors affected to q in the following order, i.e. [MB], pH, [MB]*pH, Temp, and pH*Temp, respectively. Regression models for q were developed and the adequacy of the reduced model was also examined.
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