Removal of methylene blue on zinc oxide nanoparticles: nonlinear and linear adsorption isotherms and kinetics study

Authors : Shahin AHMADI, Chinenye Adaobi IGWEGBE

Pages : 289-303

View : 55 | Download : 12

Publication Date : 2020-03-27

Article Type : Research Paper

Abstract :Environmental pollution caused by colored effluents is threatening to the world. The aim of this study is to evaluate the applicability of Zinc oxide nanoparticles insert ignore into journalissuearticles values(ZnO-NPs); for the removal of methylene blue insert ignore into journalissuearticles values(MB); from aqueous solution and also to study the applicability of the nonlinear and linear adsorption isotherm and kinetic models on the process. The effects of various operating parameters such as pH insert ignore into journalissuearticles values(3 - 11);, ZnO-NPs dosage insert ignore into journalissuearticles values(0.1 – 0.4 g/L);, contact time insert ignore into journalissuearticles values(30 - 120 min);, initial MB concentration insert ignore into journalissuearticles values(20 – 80 mg/L); on the removal of MB were studied. The adsorption kinetic and isotherm models were examined using the linear and nonlinear regression analyses methods. The results revealed that under optimal conditions of pH 7, ZnO-NPs dosage of 0.2 g/L and contact time of 60 min at concentration of 40 mg/L, the maximum adsorption capacity insert ignore into journalissuearticles values(qm); of MB adsorption on ZnO NPs was 9.6. mg/g and maximum removal was 96.25 %. The MB adsorption data was found to follow the Langmuir isotherm model than the Freundlich model using the linear regression analysis method. But the values of the error functions insert ignore into journalissuearticles values(RMSE, SD, RSS,
Keywords : Methylene blue, nanoparticles, kinetics, adsorption, error functions

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