硫化法制备废水处理用光催化剂La_3NbS_2O_5

Preparation of Photocatalyst La_3NbS_2O_5 for Wastewater Treatment by Sulfurization Process

采用高温硫化法制备了具有可见光活性的La3NbS2O5光催化剂,运用X射线衍射谱图、扫描电子显微镜照片、比表面积和紫外-可见漫反射光谱对La3NbS2O5的结构、物理性质和光吸收性能进行了表征。以亚甲基蓝为目标降解物,考察了硫化温度、催化剂加入量和制备方法对亚甲基蓝降解率的影响。实验结果表明,当硫化温度为800℃、La3NbS2O5加入量为3g/L时,该催化剂的可见光催化活性最高,亚甲基蓝降解率为94.6%。

The photocatalyst La3NbS2O5 with visible-light photocatalytic activity was prepared by sulfurization process at high-temperature, and characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, specific surface area （BET） and UV-vis diffuse reflection spectra （UVDRS ）. Using methylene blue as the degradation object, the effects of sulfurization temperature, photocatalyst dosage and preparation method on the degradation rate of methylene blue were studied. When the sulfurization temperature is 800 ℃ and the photocatalyst dosage is 3 g/L, the visible-light photocatalyfic activity of the photocatalyst is the highest with 94. 6% of methylene blue degradation rate.