Efficient Photocatalytic Decomposition of Glucose, Starch, and Cellulose to CO2 Using a Mesoporous Semiconductor Thin Film

被引：10

作者：

Kaneko, Masao ^{[1
]}

Saito, Rie ^{[2
]}

Ueno, Hirohito ^{[1
]}

Nemoto, Junichi ^{[1
]}

Izuoka, Akira ^{[2
]}

机构：

[1] Inst Biophotochemon Co Ltd, Mito, Ibaraki 3108512, Japan

[2] Ibaraki Univ, Fac Sci, Mito, Ibaraki 3108512, Japan

来源：

CATALYSIS LETTERS | 2011年 / 141卷 / 08期

关键词：

Mesoporous TiO2; Photodecomposition; Quantum efficiency; Glucose; Polysaccharides; BIO-RELATED COMPOUNDS; BIOMASS; PHOTOANODE; WASTES;

D O I：

10.1007/s10562-011-0615-1

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：

UV light-activated highly efficient photocatalytic decomposition of aqueous glucose and polysaccharides (starch and cellulose) to CO2 was successfully achieved by using a mesoporous TiO2 thin film coated on a fluorine-doped transparent conductive glass (FTO). The external quantum efficiency (eta) of 0.08 (=8%) was obtained for glucose photodecomposition at neutral pH based on the total incident UV light, and the internal quantum efficiency (eta') was 8 (=800%) based on the photon that was effective for activating the reactant, demonstrating that the major decomposition mechanism is dark auto-oxidation of the activated reactant by O-2. Glucose gave eta' values of 19 at pH 12 and 25 at pH 2 demonstrating that when a glucose molecule was once activated by one photon, the molecule can undergo auto-oxidative decomposition to CO2 at these pH under dark. Water-soluble starch was also photodecomposed completely to CO2 with estimated eta' value of 8.6. Water-soluble carboxymethyl cellulose (CMC) also underwent decomposition to CO2 with similar efficiency of eta' = 5. Solid state cellulose powders could be photodecomposed to CO2 by sandwiching them between FTO-coated TiO2 thin films.

引用

页码：1199 / 1206

页数：8