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首页> 外文期刊>Environmental Science & Technology >Characterization and Reactivity of MnO_x Supported on Mesoporous Zirconia for Herbicide 2,4-D Mineralization with Ozone
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Characterization and Reactivity of MnO_x Supported on Mesoporous Zirconia for Herbicide 2,4-D Mineralization with Ozone

机译:介孔氧化锆上负载MnO_x的除草剂2,4-D臭氧矿化反应

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摘要

Manganese oxide was supported on mesoporous zirconia (MnOV MZIW) by wet impregnation, drying, water washing, and calcinations with manganese acetate tetrahydrate as the metal precursor for the first time and was characterized by X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectra (FTIR), temperature-programmed reduction (TPR), temperature-programmed oxygen desorption (O_2-TPD), and UV-vis diffuse reflectance spectra (UV-vis DRS) measurements. The catalyst was found to be highly effective for the mineralization of 2,4-dichlorophenoxyacetic acid (2,4-D) aqueous solution with ozone. The characterization studies showed that nonstoichiometrically MnO_x was highly dispersed on mesoporous zirconia by the strong interaction of the [Mn(H_2O)_6]~(2+) complex with surface hydroxyls of the support. Moreover, the multivalence oxidation states of MnO_x enhanced the electron transfer, causing the higher catalytic reactivity. On the basis of all information obtained under different experimental conditions, MnO_x/MZIW enhanced the mineralization of 2,4-D by the formation of ~·OH radicals resulting from the catalytic decomposition of ozone.
机译:通过湿法浸渍,干燥,水洗和首次将四水合乙酸锰作为金属前体进行煅烧,将氧化锰负载在介孔氧化锆(MnOV MZIW)上,并通过X射线衍射(XRD),X射线光电子进行表征光谱(XPS),傅立叶变换红外光谱(FTIR),程序升温还原(TPR),程序升温氧气脱附(O_2-TPD)和紫外可见漫反射光谱(UV-vis DRS)测量。发现该催化剂对于用臭氧矿化2,4-二氯苯氧基乙酸(2,4-D)水溶液非常有效。表征研究表明,通过[Mn(H_2O)_6]〜(2+)配合物与载体表面羟基的强相互作用,非化学计量的MnO_x高度分散在介孔氧化锆上。此外,MnO_x的多价氧化态增强了电子转移,从而引起了更高的催化反应性。根据在不同实验条件下获得的所有信息,MnO_x / MZIW通过臭氧催化分解形成的〜·OH自由基增强了2,4-D的矿化作用。

著录项

  • 来源
    《Environmental Science & Technology》 |2008年第9期|p.3363-3368|共6页
  • 作者单位

    State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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