SEMICONDUCTOR PHOTOCATALYSIS - EFFECTIVE PHOTOREDUCTION OF CARBON-DIOXIDE CATALYZED BY ZNS QUANTUM CRYSTALLITES WITH LOW-DENSITY OF SURFACE-DEFECTS

被引：147

作者：

KANEMOTO, M ^{[1
]}

SHIRAGAMI, T ^{[1
]}

PAC, CJ ^{[1
]}

YANAGIDA, S ^{[1
]}

机构：

[1] OSAKA UNIV,FAC ENGN,SUITA,OSAKA 565,JAPAN

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 08期

关键词：

D O I：

10.1021/j100187a062

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：

Freshly prepared colloidal ZnS suspensions (ZnS-0) effectively catalyze photoreduction of CO2 in water at pH 7 with NaH2PO2 in the coexistence of Na2S under UV irradiation. With competitive H-2 evolution, formate and a very small quantity of CO were formed with the apparent quantum yield PHI(1/2HCOO-, 0.24 at 313 nm, where H2PO2- was quantitatively photoxidized to HPO32-. The efficiency strongly depends on the pH of the system, preparation methods of ZnS photocatalysts, and synergistic effects of electron donors. Quantized ZnS crystallites with low density of surface defects are indispensable for the effective CO2 reduction. The synergistic effect in the use of both SH- and H2PO2- ions is discussed in terms of spectral properties of the photocatalyst.

引用

页码：3521 / 3526

页数：6

共 38 条

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