CoFe_(2)O_(4)@Zeolite催化剂活化过一硫酸盐对甲基橙的强化降解:性能与机理  

Enhanced Degradation of Methyl Orange with CoFe_(2)O_(4)@Zeolite Catalyst as Peroxymonosulfate Activator:Performance and Mechanism

作　　者：王磊 李建军[1,2] 宁军 胡天玉 王洪阳 张占群 武琳馨 WANG Lei;LI Jianjun;NING Jun;HU Tianyu;WANG Hongyang;ZHANG Zhanqun;WU Linxin(School of Materials Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China;Institute of Environment-friendly Materials and Occupational Health,Anhui University of Science and Technology,Wuhu 241000,China;Anhui Shuiyun Environmental Protection Co.,Ltd.,Wuhu 241000,China)

机构地区：[1]安徽理工大学材料科学与工程学院,淮南232001 [2]安徽理工大学环境友好材料与职业健康研究院,芜湖241000 [3]安徽水韵环保股份有限公司,芜湖241000

出　　处：《无机材料学报》2023年第4期469-476,共8页Journal of Inorganic Materials

基　　金：Natural Science Foundation of Anhui Province(1908085ME127);Research Foundation of the Institute of Environmentfriendly Materials and Occupational Health(Wuhu),Anhui University of Science and Technology(ALW2021YF11)。

摘　　要：采用共沉淀水热法制备了CoFe_(2)O_(4)@Zeolite(CFZ),并将其用于活化过一硫酸盐(PMS)降解合成染料。综合表征表明,组成多孔壳层的CoFe_(2)O_(4)纳米颗粒均匀地覆盖在Na-A沸石上。CFZ的比表面积为107.06 m^(2)/g,是原始沸石比表面积的3倍。CFZ的饱和磁化强度为29.0 A·m^(2)·kg^(–1),可以进行有效磁分离。催化降解实验表明,CFZ/PMS体系对甲基橙(MO)的去除率远远高于单独使用CFZ或PMS。在最佳条件([MO]=50 mg/L、[PMS]=1.0 mmol/L、0.2 g/L CFZ、pH 8和T=25℃)下,MO去除率可达到97.1%。实验研究了pH、PMS用量、CFZ用量、MO浓度以及共存阴离子等因素对CFZ催化性能的影响。活性氧粒子淬灭实验表明,1O2和O_(2)^(•–)在降解过程中起主导作用。CFZ具有良好的回收性能,5次循环后MO去除效率仅下降2.4%。本文还详细讨论了CFZ/PMS体系的催化降解机理。CoFe_(2)O_(4)@zeolite(CFZ)was prepared by using a co-precipitation hydrothermal method and used for synthetic dyes degradation by activating peroxymonosulfate(PMS).Comprehensive characterizations suggest that CoFe_(2)O_(4)nanoparticles composing porous shell layer is uniformly covered on Na-A zeolite.The specific surface area of CFZ is 107.06 m2/g,three times that of the original zeolite.Since CFZ has a saturation magnetization of 29.0 A·m^(2)·kg^(–1),it could be separated efficiently by magnetic separation.Catalytic degradation experiments indicate that the removal of methyl orange(MO)in the CFZ/PMS system is much higher than that using CFZ or PMS alone.Under the optimum condition([MO]=50 mg/L,[PMS]=1.0 mmol/L,0.2 g/L CFZ,pH 8 and T=25℃),MO removal efficiency is up to 97.1%.Effect of various factors,including pH,PMS and CFZ dosage,MO concentration and presence of coexisting anions,on the catalytic performance of CFZ is carefully studied.Reactive oxygen species quenching experiments suggest that^(1)O_(2)and O_(2)^(•–)play a dominant role in the degradation process.CFZ shows excellent recycling performance that the MO removal is declined by only 2.4%after 5 cycles.Catalytic degradation mechanism of the CFZ/PMS system is explored in detail.

关 键 词：高级氧化技术 过一硫酸盐活化 磁性催化剂 CoFe_(2)O_(4)@Zeolite 活性氧粒子 降解 

分 类 号：TB332[一般工业技术—材料科学与工程]