Surface properties of Ta2O5 layers prepared on SBA-15

被引：4

作者：

Kondo, Junko N. ^{[1
]}

Iguchi, Ai ^{[1
]}

Tanaka, Manabu ^{[1
]}

Imai, Hiroyuki ^{[1
]}

Yokoi, Toshiyuki ^{[1
]}

Tatsumi, Takashi ^{[1
]}

机构：

[1] Tokyo Inst Technol, Chem Resources Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

CATALYSIS TODAY | 2012年 / 192卷 / 01期

关键词：

Ta2O5; Mesoporous materials; SBA-15; UV-vis absorption; Adsorption; MESOPOROUS TANTALUM OXIDE; TA MIXED-OXIDE; WATER DECOMPOSITION; PHOTOCATALYSIS; MESOSTRUCTURE; SILICA; MG;

D O I：

10.1016/j.cattod.2012.01.019

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Ta2O5 layer was prepared onto SBA-15 (Ta2O5/SBA-5) with Ta ethoxide precursor. The surface properties of Ta2O5/SBA-5 was the same as those of mesoporous Ta2O5, possessing electron accepting sites and hydrophobicity, but the structural stability upon thermal treatment was improved due to the presence of SBA-5. The drastic blue shift in UV-vis absorption band was observed when the phase of Ta2O5 became thinner. Accordingly, band gaps of Ta2O5 samples increased from 4.0 (nonporous Ta2O5) to 4.3 eV (mesoporous Ta2O5, 2.3 nm wall thickness), and further increased to 4.9 eV for thin-layered Ta2O5/SBA-5 (0.5 nm Ta2O5 layer). Thus, stable activity for photocatalytic water decomposition was not observed over thin-layered Ta2O5/SBA-5. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：197 / 202

页数：6

共 18 条

[1] Synthesis and characterization of hexagonally packed mesoporous tantalum oxide molecular sieves [J].

Antonelli, DM ;

Ying, JY .

CHEMISTRY OF MATERIALS, 1996, 8 (04) :874-881

[2] DIRECT DIFFUSION MEASUREMENTS OF NAPHTHACENE ON SILICA AS A FUNCTION OF SILANOL DENSITY [J].

BJARNESON, DW ;

PETERSEN, NO .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1990, 112 (03) :988-992

[3] METHYLENE BLUE ABSORPTION BY CLAY MINERALS - DETERMINATION OF SURFACE AREAS AND CATION EXCHANGE CAPACITIES - (CLAY-ORGANIC STUDIES .18 [J].

HANG, PT .

CLAYS AND CLAY MINERALS, 1970, 18 (04) :203-&

[4] Highly efficient decomposition of pure water into H2 and O2 over NaTaO3 photocatalysts [J].

Kato, H ;

Kudo, A .

CATALYSIS LETTERS, 1999, 58 (2-3) :153-155

[5]

KATO H, 1999, CHEM LETT, P1027

[6] Synthesis of 2D-hexagonally ordered mesoporous niobium and tantalum mixed oxide [J].

Katou, T ;

Lu, DL ;

Kondo, JN ;

Domen, K .

JOURNAL OF MATERIALS CHEMISTRY, 2002, 12 (05) :1480-1483

[7]

KISELER AV, 1975, INFRARED SPECTRA SUR, P80

[8] Synthesis, mesostructure, and photocatalysis of a highly ordered and thermally stable mesoporous Mg and Ta mixed oxide [J].

Kondo, JN ;

Uchida, M ;

Nakajima, K ;

Lu, DL ;

Hara, M ;

Domen, K .

CHEMISTRY OF MATERIALS, 2004, 16 (22) :4304-4310

[9] Synthesis and property of mesoporous tantalum oxides [J].

Kondo, JN ;

Takahara, Y ;

Lee, B ;

Lu, DL ;

Domen, K .

TOPICS IN CATALYSIS, 2002, 19 (02) :171-177

[10] Mesoporous Ta Oxide. 2. Improvement of the synthetic method and Observation of mesostructure fromation [J].

Kondo, JN ;

Takahara, Y ;

Lu, DL ;

Domen, K .

CHEMISTRY OF MATERIALS, 2001, 13 (04) :1200-1206

← 1 2 →