- Sigma Mühendislik ve Fen Bilimleri Dergisi
- Vol: 38 Issue: 1
- Removal of methylene blue on zinc oxide nanoparticles: nonlinear and linear adsorption isotherms and...
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 : 7 | Download : 2
Publication Date : 2020-03-27
Article Type : Research
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 (ZnO-NPs) for the removal of methylene blue (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 (3 - 11), ZnO-NPs dosage (0.1 – 0.4 g/L), contact time (30 - 120 min), initial MB concentration (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 (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 (RMSE, SD, RSS,Keywords : Methylene blue, nanoparticles, kinetics, adsorption, error functions.