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以多孔硅KIT-6为模板,采用纳米浇筑法制备三维有序介孔Co_3O_4,利用比表面积测试仪(BET)、高倍投射电子显微镜(H-TEM)、X射线衍射光谱(XRD)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FT-IR)等方法进行表征,并首次将其应用于催化单过硫酸盐降解罗丹明B.结果表明,三维有序介孔Co_3O_4具有丰富的空间介孔结构和巨大的比表面积,对单过硫酸盐的催化活性远强于传统纳米级Co_3O_4.较高的催化剂投加量和较高的单过硫酸盐浓度有利于罗丹明B的脱色.在反应体系中出现Cl-和H2PO-4能够加速罗丹明B的脱色,而出现NO_3~-、SO_4~(2-)和HCO_3~-则会抑制罗丹明B的去除.通过自由基鉴定实验发现,硫酸自由基是导致罗丹明B脱色的主导活性自由基.三维有序介孔Co_3O_4经过多次重复使用后仍表现出良好的催化活性.
Using porous silicon KIT-6 as a template, three-dimensional ordered mesoporous Co_3O_4 was prepared by nano-pouring method and characterized by BET, high-resolution transmission electron microscopy (H-TEM), X-ray diffraction Photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR) were used to characterize the degradation of rhodamine B. The results showed that the three-dimensional ordered mesoporous Co_3O_4 was rich Of the space mesoporous structure and large specific surface area, monopersulfate catalytic activity far stronger than the traditional nanoscale Co_3O_4 higher catalyst dosage and higher monopersulfate concentration is conducive to the decolorization of rhodamine B The presence of Cl- and H2PO-4 in the reaction system can accelerate the decoloration of rhodamine B, while the presence of NO 3 -, SO 4 2-, and HCO 3 3- can inhibit the removal of rhodamine B. The free radical assay It was found that the free radical of sulfuric acid is the dominant active free radical which leads to the decoloration of rhodamine B. The three-dimensional ordered mesoporous Co_3O_4 still shows good catalytic activity after repeated use.