三维有序介孔Co_3O_4非均相活化单过硫酸氢钾降解罗丹明B  

Heterogeneous Activation of Peroxymonosulfate with Three-dimensional Ordered Mesoporous Co_3O_4 for the Degradation of Rhodamine B

作　　者：冯善方 邓思萍 杜嘉雯[1] 马晓雁[1] 卢遇安[1] 高乃云[2] 邓靖[1] 

机构地区：[1]浙江工业大学建筑工程学院,杭州310014 [2]同济大学环境科学与工程学院,上海200092

出　　处：《环境科学》2016年第11期4247-4254,共8页Environmental Science

基　　金：国家自然科学基金项目(51508509);浙江省自然科学基金项目(LY15E080019);中国博士后科学基金项目(2015M581936);天津市水质科学与技术重点实验室开放基金项目(TJKLAST-ZD-2014-01)

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.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^-,SO4^（2-） 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.

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 

分 类 号：X131[环境科学与工程—环境科学] TU991.2[建筑科学—市政工程]