☆ 4.7 Article

Catalysis of MnO2-cellulose acetate composite films in DBD plasma system and sulfamethoxazole degradation by the synergistic effect

SEPARATION AND PURIFICATION TECHNOLOGY (2022)

期刊

SEPARATION AND PURIFICATION TECHNOLOGY

卷 298, 期 -, 页码 -

出版社

ELSEVIER

DOI: 10.1016/j.seppur.2022.121608

关键词

Dielectric barrier discharge plasma; Catalytic ozonation; Sulfamethoxazole; Synergistic effect

类别

Engineering, Chemical

资金

National Natural Science Foundation of China [21876070]

向作者/读者索取更多资源

Protocol

社区支持

Reagent

社区支持

智能总结 New
摘要

In this study, MnO2/CA composite films were successfully prepared and coupled with DBD plasma to degrade SMX in water. The optimal catalytic performance was achieved by adding 3% MnO2/CA films under alkaline conditions. The MnO2/CA composite films maintained their catalytic activity even after four uses.

Herein, dielectric barrier discharge (DBD) plasma and MnO2-cellulose acetate (MnO2/CA) composite films was coupled together to degrade sulfamethoxazole (SMX) in water. The MnO2/CA composite films were firstly prepared successfully though heating blending method in this study and then characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Raman spectra, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TG). Catalytic effect of the MnO2/CA films was investigated by comparing the removal percentages, the kinetic constants, the energy utilization efficiencies (G(50)) as well as the COD and TOC removal during the SMX degradation in the DBD plasma system with or without the MnO2/CA films addition under different reaction conditions. The optimal catalytic performance was obtained by adding the 3% MnO2/CA films into the DBD plasma system and the alkaline solution condition was favorable for the SMX degradation. After four times using, the MnO2/CA composite films still maintained the catalytic activity. Catalytic mechanism of the MnO2/CA films was speculated by analyzing the changes of solution pH and conductivity during the reaction, concentrations of the formed O3 and H2O2 in water and the generated active species (O-1(2) and center dot OH) in both the DBD plasma system and the DBD-MnO2/CA films system. The quenching test was also carried out to figure out the important effect of the center dot O-2, O-1(2) and center dot OH for the SMX degradation in the synergistic system. Finally, LC-MS was used to analyze the main intermediates generated during the SMX degradation and the possible degradation pathways were accordingly speculated. The research could provide a new direction for the development and application of the DBD plasma technology as well we the composite films catalyst.

作者

我是这篇论文的作者

点击您的名字以认领此论文并将其添加到您的个人资料中。

主要评分

4.7

评分不足

次要评分

新颖性

重要性

科学严谨性

评价这篇论文

DBD plasma coupling MnO2-Fe3O4-cellulose acetate films for sulfamethoxazole degradation: Insight for catalytic ozonation and Fenton effect

Huihui Zhang, Shilin Song, Qingjie Xie, Yansheng Du, Yuyue Huang, Kun Hu, Chundu Wu, Qiangshun Wu, Huijuan Wang

Summary: This study investigated the efficient degradation of sulfamethoxazole (SMX) by coupling dielectric barrier discharge (DBD) plasma and MnO2-Fe3O4-cellulose acetate (MnO2-Fe3O4-CA) film catalyst. The successful preparation of the MnO2-Fe3O4-CA film was confirmed by SEM, XRD, FT-IR, and XPS. The optimal composition of MnO2-Fe3O4 and CA was determined, and the addition of 3% 3:1 MnO2-Fe3O4-CA films into the DBD system resulted in a 93.55% removal rate of SMX. Mechanism analysis revealed the involvement of & BULL;OH, & BULL;O2 , and 1O2 in SMX degradation. The MnO2-Fe3O4-CA catalyst promoted Fenton reaction and ozone decomposition, generating more reactive oxygen species responsible for the increased SMX degradation. The cyclic experiments demonstrated the repeatability and stability of the film. Four degradation routes of SMX were identified, and the toxicity was evaluated.

JOURNAL OF WATER PROCESS ENGINEERING (2023)