Characterization and reactivity of MnOx supported on mesoporous zirconia for herbicide 2,4-D mineralization with ozone

被引：118

作者：

Xing, Shengtao ^{[1
]}

Hu, Chun ^{[1
]}

Qu, Jiuhui ^{[1
]}

He, Hong ^{[1
]}

Yang, Min ^{[1
]}

机构：

[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2008年 / 42卷 / 09期

关键词：

D O I：

10.1021/es0718671

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Manganese oxide was supported on mesoporous zirconia (MnOx/ 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 MnOx was highly dispersed on mesoporous zirconia by the strong interaction of the [Mn(H2O)(6)](2+) complex with surface hydroxyls of the support. Moreover, the multivalence oxidation states of MnOx enhanced the electron transfer, causing the higher catalytic reactivity. On the basis of all information obtained under different experimental conditions, MnOx/MZIW enhanced the mineralization of 2,4-D by the formation of (OH)-O-center dot radicals resulting from the catalytic decomposition of ozone.

引用

页码：3363 / 3368

页数：6

共 37 条

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