Using corn stalk biochar and bismuth nitrate as raw materials,biochar/ZnO/BiFeO3 composites with visible light responsiveness were prepared by citric acid complexation one-step calcination method.The structure and morphology of the samples were characterized by ultraviolet-visible diffuse reflectance (UV-Vis DRS),X-ray diffraction (XRD) and scanning electron microscopy (SEM),and the degradation efficiency of the samples for methyl orange solution was investigated.The results showed that the degradation rate of 1g/L biochar/ZnO/BiFeO3 composite reached 99.4% for 10mg/L methyl orange solution under 300W xenon lamp irradiation for 120min,which was 2.9 times higher than that of BiFeO3.The degradation rate was still 94.0% after 4 cycles.The superoxide radical (·O-2) played a decisive role in the photocatalytic degradation process.
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基金资助
国家重点研发计划项目(2019YFB1503805);湖南省自然科学基金项目(2019JJ40535);湖南省大学生创新训练计划项目(2022-2824)
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