Preparation and Adsorption Properties of MnO2@Cu2O Composites
MnO2@Cu2O composites were successfully prepared by a hydrothermal method,and the effects of different morphology Cu2O substrates and copper-manganese molar ratios on the adsorption properties of acid orange(AO7)dye were systematically investi-gated.The adsorption process was analyzed by fitting adsorption kinetics,adsorption thermodynamics,and adsorption isotherm models.The results show that the linear MnO2 was successfully loaded on the surface of Cu2O,which enabled MnO2@Cu2O(spherical)to exhibit a larger specific surface area,pore volume,and pore size compared to Cu2O(spherical).1%MnO2@Cu2O(spherical)showed the best adsorption of AO7 at an initial pH of 6,with an adsorption rate of 96.87%.Compared to the Cu2O-based MnO2@Cu2O com-posites with octahedral and orthorhombic morphology,the spherical material has more{111}crystalline active sites,which enhances its adsorption performance.The adsorption process of MnO2@Cu2O on AO7 is in accordance with the quasi-primary kinetic model and Langmuir adsorption model,and the adsorption reaction is spontaneous monolayer physical adsorption and exothermic.In addition,the experimental data also showed that the adsorption reaction was more favorable at lower temperatures,and the theoretical maximum adsorption amount of the material was 361.17 mg/g at 25℃.
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