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        Effective removal of arsenide from aqueous solutions using mesoporous CoFe2O4/graphene oxide nanocomposites assisted by artificial intelligence

        Wu Xianliang,Hu Jiwei,Wang Xingfu,Xin Ling,Li Caifang,Wei Xionghui 한국탄소학회 2021 Carbon Letters Vol.31 No.6

        This study investigated the arsenide removal by using mesoporous CoFe2O4/graphene oxide nanocomposites based on batch experiments optimized by artifcial intelligence tools. These nanocomposites were prepared by immobilizing cobalt ferrite on graphene oxide and then characterized using various techniques, including small angle X-ray difraction, high-resolution transmission electron microscopy and energy-dispersive X-ray spectroscopy. Artifcial intelligence tools associated with response surface methodology were employed to optimize the conditions of the arsenide removal process. The results showed that back propagation neural network combined with genetic algorithm was suitable for the arsenide removal from aqueous solutions by the nanocomposites based on the minimum average values of absolute errors and the value of R2 . The optimal values of the four variables (operating temperature, initial pH, initial arsenide concentration, and contact time) were found to be 25.66 °C, 7.58, 10.78 mg/L and 46.41 min, and the predicted arsenide removal percentage was 84.78%. The verifcation experiment showed that the arsenide removal percentage was 86.62%, which was close to the predicted value. Three evaluation methods (gradient boosted regression trees, Garson method and analysis of variance) all demonstrated that the temperature was the most important explanatory variable for the arsenide removal. In addition, the arsenide removal process can be depicted with pseudo-second-order kinetics model and Langmuir isotherm, respectively. The thermodynamics investigation disclosed that the adsorption process was of a spontaneously endothermic nature. In summary, this study showed that ANN-GA was an efcient and feasible method in determining the optimum conditions for arsenic removal by CoFe2O4/graphene oxide nanocomposites.

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