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首页> 外文期刊>Catalysis science & technology >Mixed-valent manganese oxide for catalytic oxidation of Orange II by activation of persulfate: heterojunction dependence and mechanism
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Mixed-valent manganese oxide for catalytic oxidation of Orange II by activation of persulfate: heterojunction dependence and mechanism

机译：Mixed-valent锰氧化物催化橙色氧化二世的激活过硫酸盐:异质结和的依赖机制

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摘要

The coexistence of aliovalent cations may facilitate the formation of electronic and ionic defects, altering the catalytic properties of manganese oxide. In this paper, a series of mixed-valent manganese oxides (MnOx) were prepared by a hydrothermal route and tested for heterogeneous activation of peroxydisulfate for Orange II degradation in aqueous solution. The morphology, crystal structure and surface chemistry of the MnOx were adjusted by the addition of ethanol in the hydrothermal process. The physicochemical properties were characterized and evidence from X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) indicated that MnOx exhibited a mixed crystal phase structure of Mn2O3, Mn3O4 and MnO2. The catalytic properties of the three samples prepared with 5%, 10%, and 20% volume fractions of ethanol (denoted as MnOx-5, MnOx-10, and MnOx-20) were found to be related to the valent states of Mn, and MnOx-10 exhibited a better performance with a mole ratio of Mn4+/ Mn2+ close to 1.0. The electrochemical characterization demonstrated that MnOx-10 performed a more effective redox process which may determine the catalytic activity of MnOx. Moreover, quenching tests, electron paramagnetic resonance (EPR) and gas chromatography-mass spectrometry (GC-MS) were used to evaluate the possible activation processes of peroxydisulfate (PDS) and the intermediates of Orange II degradation. This catalyst preparation strategy provides a new idea for the preparation of high-efficiency environmental catalysts.
机译：aliovalent阳离子的共存促进电子和离子的形成缺陷,改变的催化性能锰氧化物。mixed-valent锰氧化物(MnOx)由热液的路线和测试异构的peroxydisulfate激活橙色二世在溶液中降解。形态、晶体结构和表面化学MnOx被调整的在水热过程中添加乙醇。物理化学性质的特点并从x射线衍射(XRD)和证据高分辨率透射电子显微镜(HRTEM)表示,MnOx混合展出Mn2O3的晶相结构,Mn3O4和汇总。三个样品的催化性质用5%,10%和20%体积分数乙醇(表示MnOx-5 MnOx-10,MnOx-20)被发现与化合价的有关锰、和MnOx-10表现出更好的性能的摩尔比Mn4 + / Mn2 +关闭到1.0。证明MnOx-10表现更有效的氧化还原过程确定MnOx的催化活性。测试,电子顺磁共振(EPR)和气相色谱分析-质谱法(gc - ms)用来评估可能的激活过程peroxydisulfate (PDS)和中间体的橙色II退化。催化剂制备策略提供了一个新的想法制备高效环境催化剂。

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