Nb-containing hematites Fe2-xNbxO3: The role of Nb5+ on the reactivity in presence of the H2O2 or ultraviolet light

被引：73

作者：

Silva, Adilson C. ^{[1
]}

Oliveira, Diana Q. L. ^{[1
]}

Oliveira, Luiz C. A. ^{[1
]}

Anastacio, Alexandre S. ^{[1
]}

Ramalho, Teodorico C. ^{[1
]}

Lopes, Joao H. ^{[2
]}

Carvalho, Hudson W. P. ^{[3
]}

Torres, Claudia E. Rodriguez ^{[4
]}

机构：

[1] Univ Fed Lavras, Dept Chem, BR-37200000 Lavras, MG, Brazil

[2] Univ Estadual Campinas, Dept Chem, Campinas, SP, Brazil

[3] Univ Estadual Paulista, Dept Phys Chem, BR-14801970 Araraquara, SP, Brazil

[4] Natl Univ La Plata, Dept Phys, RA-1900 La Plata, Argentina

来源：

APPLIED CATALYSIS A-GENERAL | 2009年 / 357卷 / 01期

关键词：

Hematite; Niobium; Organic oxidation; ESI-MS; ORGANIC CONTAMINANTS; HYDROGEN-PEROXIDE; WASTE-WATER; AZO-DYE; OXIDATION; DEGRADATION; CATALYST; SYSTEM; MECHANISMS; OXIDES;

D O I：

10.1016/j.apcata.2009.01.014

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of Nb-containing hematites, Fe-2-xNbxO3 (%Nb = 0.00, 1.49, 5.00 and 9.24) was prepared using the conventional co-precipitation method. Mossbauer and temperature-programmed reduction (TPR) measurements suggested the formation of the crystalline phase with partial substitution of Fe3+ by Nb5+ in the structure. N-2 adsorption/desorption revealed that the presence of Nb has a remarkable effect on the textural properties of the material with an increase in the BET surface area. The reactivity of Fe2-xNbxO3 was investigated using the oxidation of the methylene blue dye used as a model pollutant. The obtained results showed that the presence of Nb seems not to act directly promoting the H2O2 decomposition, but improving the dye oxidation. The analysis using the ESI-MS technique showed partial oxidation observed through different intermediates before the mineralization. This suggests the use of Nb-doped hematite as an efficient catalyst in degradation reactions in the presence of H2O2 or ultraviolet light. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：79 / 84

页数：6

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