Box Behnken Design in the Optimization of Rhodamine B Adsorption onto Activated Carbon Prepared from Delonix regia Seeds and Pods

Authors : Samsudeen AZEEZ, Ismaila SAHEED, Folahan ADEKOLA, Akeem JIMOH, David ARANSIOLA, Zuliah ABDULSALAM

Pages : 209-226

Doi:10.18596/jotcsa.893472

View : 39 | Download : 10

Publication Date : 2022-02-28

Article Type : Research Paper

Abstract :The uptake of Rodamine B insert ignore into journalissuearticles values(RhB); dye onto chemically prepared activated carbon from Delonix regia pods insert ignore into journalissuearticles values(DPAC); and seeds insert ignore into journalissuearticles values(DSAC); by response surface methodology were investigated. The activated carbons were prepared with 1 M nitric acid and characterized by Brunauer–Emmett–Teller insert ignore into journalissuearticles values(BET); surface area analysis, Fourier transform infrared insert ignore into journalissuearticles values(FTIR); spectroscopy, Scanning electron microscopy insert ignore into journalissuearticles values(SEM); and Energy dispersed x-ray spectroscopy insert ignore into journalissuearticles values(EDX);. The results obtained revealed that the prepared activated carbons DPAC and DSAC possess mesoporous structure. Optimization of the four operating variables viz; concentration, adsorbent dosage, contact time, and pH on RhB adsorption were examined using Box Behnken design insert ignore into journalissuearticles values(BBD);. A maximum removal efficiency of RhB from aqueous solution was achieved at 99.16% and 98.36% for DSAC and DPAC respectively with initial concentration of 55 mg/L, 0.1 g dosage, pH 12 and 725 min for both adsorbents. Comparing the actual values 99.16% insert ignore into journalissuearticles values(DSAC); and 98.36% insert ignore into journalissuearticles values(DPAC); with predicted values 101.7% insert ignore into journalissuearticles values(DSAC); and 99.40% insert ignore into journalissuearticles values(DPAC); having good agreement confirms the suitability of the proposed model. The adsorption process fitted best into Freundlich isotherm model when compared with Langmuir and Temkin isotherm. The adsorption process was adequately described by pseudo-second order kinetics model. Intra-particle diffusion appears to control the adsorption process but is not the only rate limiting step.
Keywords : Delonix regia, Activated carbon, Box Behnken design, Adsorption isotherm, Rhodamine B

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