无机材料学报 ›› 2023, Vol. 38 ›› Issue (4): 469-476.DOI: 10.15541/jim20220591 CSTR: 32189.14.10.15541/jim20220591

• 研究快报 • 上一篇    

CoFe2O4@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

王磊1(), 李建军1,2(), 宁军3, 胡天玉1,2, 王洪阳1, 张占群1, 武琳馨1   

  1. 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
  • 收稿日期:2022-10-09 修回日期:2022-11-27 出版日期:2023-04-20 网络出版日期:2022-12-30
  • 通讯作者: 李建军, 教授. E-mail: ljj.hero@126.com
  • 作者简介:王磊(1998-), 男, 硕士研究生. E-mail: wangleidreamer@126.com

Enhanced Degradation of Methyl Orange with CoFe2O4@Zeolite Catalyst as Peroxymonosulfate Activator: Performance and Mechanism

WANG Lei1(), LI Jianjun1,2(), NING Jun3, HU Tianyu1,2, WANG Hongyang1, ZHANG Zhanqun1, WU Linxin1   

  1. 1. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
    2. Institute of Environment-friendly Materials and Occupational Health, Anhui University of Science and Technology, Wuhu 241000, China
    3. Anhui Shuiyun Environmental Protection Co., Ltd., Wuhu 241000, China
  • Received:2022-10-09 Revised:2022-11-27 Published:2023-04-20 Online:2022-12-30
  • Contact: LI Jianjun, professor. E-mail: ljj.hero@126.com
  • About author:WANG Lei (1998-), male, Master candidate. E-mail: wangleidreamer@126.com
  • Supported by:
    Natural Science Foundation of Anhui Province(1908085ME127);Research Foundation of the Institute of Environment-friendly 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CoFe2O4@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CoFe2O4纳米颗粒均匀地覆盖在Na-A沸石上。CFZ的比表面积为107.06 m2/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·m2·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O2•-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。

关键词: 高级氧化技术, 过一硫酸盐活化, 磁性催化剂, CoFe2O4@Zeolite, 活性氧粒子, 降解

Abstract:

CoFe2O4@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 CoFe2O4 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·m2·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 1O2 and O2•- 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.

Key words: advanced oxidation processe, peroxymonosulfate activation, magnetic catalyst, CoFe2O4@Zeolite, reactive oxygen species, degradation

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