OPTIMIZATION OF PROCESS CONDITIONS FOR ADSORPTION OF METHYLENE BLUE ON FORMALDEHYDE-MODIFIED PEANUT SHELLS USING BOX-BEHNKEN EXPERIMENTAL DESIGN AND RESPONSE SURFACE METHODOLOGY

Authors : Sinan KUTLUAY, Orhan BAYTAR, Ömer ŞAHİN, Ali ARRAN

Pages : 131-142

Doi:10.36222/ejt.649205

View : 16 | Download : 6

Publication Date : 2020-06-01

Article Type : Research Paper

Abstract :This paper presents the use of formaldehyde-modified peanut shells as bioadsorbent for the adsorption of methylene blue for the first time. Firstly, the effect of medium pH, which is one of the important parameters for adsorption process, was determined. Then, the adsorption process conditions such as adsorption time insert ignore into journalissuearticles values(30-150 min);, initial concentration insert ignore into journalissuearticles values(50-200 ppm); and ambient temperature insert ignore into journalissuearticles values(25-40°C); were optimized by using response surface methodology insert ignore into journalissuearticles values(RSM); based on Box-Behnken experimental design. The pseudo-first order and pseudo-second order kinetic models were used to evaluate the adsorption kinetic in this study under optimized process conditions . The maximum adsorption capacity was found under optimum process conditions; 92.25 min adsorption time, 191.87 ppm initial concentration, 39.70°C adsorption temperature. The maximum adsorption capacity for methylene blue was determined to be 43.84 mg/g using RSM based on Box-Behnken experimental design. Adsorption kinetic results showed that the plots of the pseudo-second order kinetic model were fit the experimental data better when compared to the pseudo-first order model. In addition, results indicated that formadehite-modified peanut shells could be used as low cost and effective bioadsorbent for the adsorption of methylene blue, which is one of the important dyes. Furthermore , it was concluded that the RSM based on Box-Behnken experimental design can be applied successfully for the methylene adsorption process.
Keywords : Response surface methodology, Box Behnken experimental design, Bioadsorbent, Methylene blue adsorption