Modeling and Optimization of the Photocatalytic Reduction of Molecular Oxygen to Hydrogen Peroxide over Titanium Dioxide

被引：117

作者：

Burek, Bastien O. ^{[1
,2
]}

Bahnemann, Detlef W. ^{[2
,3
]}

Bloh, Jonathan Z. ^{[1
]}

机构：

[1] DECHEMA Forschungsinst, Theodor Heuss Allee 25, D-60486 Frankfurt, Germany

[2] Leibniz Univ Hannover, Inst Tech Chem, Callinstr 3, D-30167 Hannover, Germany

[3] St Petersburg State Univ, Lab Photoact Nanocomposite Mat, Ulyanovskaya Str 1, St Petersburg 198504, Russia

来源：

ACS CATALYSIS | 2019年 / 9卷 / 01期

关键词：

photocatalysis; light intensity; titanium dioxide (TiO2); oxygen reduction; hydrogen peroxide (H2O2); catalyst inactivation; TIO2; PHOTOCATALYSIS; HETEROGENEOUS PHOTOCATALYSIS; LIGHT-INTENSITY; WATER OXIDATION; H2O2; PRODUCTION; KINETIC-MODEL; DEPENDENCE; OXIDE; PHOTOOXIDATION; MECHANISMS;

D O I：

10.1021/acscatal.8b03638

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：

This study focuses on understanding the mechanisms for optimization of the photocatalytic hydrogen peroxide production over TiO2 (Aeroxide P25). Via precise control of the reaction parameters (pH, temperature, catalyst amount, oxygen content, sacrificial electron donor, and light intensity), it is possible to tune either the apparent quantum yield or the production rate. As a result of the optimization, apparent quantum yields of up to 19.8% and production rates of up to 83 mu M min(-1) were obtained. We also observed a light-dependent change of the reaction order and an interdependency of the light intensity and catalyst amount, and we developed a well-fitting kinetic model for it, which might also be applied to other reactions. Furthermore, a previously unreported inactivation of the photocatalyst in the case of water oxidation is described.

引用

页码：25 / 37

页数：25

共 91 条

[1] Photocatalytic and photoelectrochemical oxidation mechanisms of methanol on TiO2 in aqueous solution [J].