| 三维有序介孔Co3O4非均相活化单过硫酸氢钾降解罗丹明B |
| 摘要点击 4512 全文点击 1388 投稿时间：2016-04-23 修订日期：2016-06-07 |
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| 中文关键词 三维有序介孔Co3O4 单过硫酸盐 硫酸自由基 罗丹明B 降解 |
| 英文关键词 three-dimensional ordered mesoporous Co3O4 peroxymonosulfate sulfate radicals rhodamine B degradation |
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| 中文摘要 |
| 以多孔硅KIT-6为模板，采用纳米浇筑法制备三维有序介孔Co3O4，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Co3O4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Co3O4.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H2PO4-能够加速罗丹明B的脱色，而出现NO3-、SO42-和HCO3-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Co3O4经过多次重复使用后仍表现出良好的催化活性. |
| 英文摘要 |
| Three-dimensional ordered mesoporous Co3O4 was prepared by nanocasting method with porous silicon KIT-6 as the hard template and firstly used to activate peroxymonosulfate for the degradation of rhodamine B. The structural properties were characterized by BET, H-TEM, XRD, XPS, FT-IR. The results showed that three-dimensional ordered mesoporous Co3O4 presented far superior catalytic activity over conventional nanoscale Co3O4 due to its abundant space mesoporous channel structure and the large specific surface areas. Higher catalyst dosage and higher peroxymonosulfate concentration favored the decolorization of rhodamine B. The removal of rhodamine B could be accelerated in the presence of Cl- and H2PO4-; however, the decolorization of rhodamine B would be inhibited in the presence of NO3-, SO42- and HCO3-. Sulfate radicals were identified as the dominant active species for the decolorization of rhodamine B through radicals quenching experiments. Three-dimensional ordered mesoporous Co3O4 showed excellent catalytic activity even after five consecutive cycles. |
