Effective photocatalytic reduction of nitrate to ammonia in an aqueous suspension of metal-loaded titanium(IV) oxide particles in the presence of oxalic acid

被引：128

作者：

Kominami, H ^{[1
]}

Furusho, A

Murakami, S

Inoue, H

Kera, Y

Ohtani, B

机构：

[1] Kinki Univ, Fac Sci & Engn, Dept Appl Chem, Osaka 5778502, Japan

[2] Hokkaido Univ, Catalysis Res Ctr, Sapporo, Hokkaido 0600811, Japan

来源：

CATALYSIS LETTERS | 2001年 / 76卷 / 1-2期

关键词：

titanium oxide; photocatalyst; nitrate reduction; ammonia;

D O I：

10.1023/A:1016771908609

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：

Photocatalytic reduction of nitrate ion (NO,) in an aqueous suspension of metal-loaded titanium(IV) oxide (TiO2) was examined in the presence of oxalic acid (OA) as a hole scavenger. Conversion of NO3- into ammonia (NH3) competed with hydrogen liberation, and the NH3 production selectivity increased with the order of loaded metal, (Pt, Pd, Co) < (Ni, Au) < (Ag, Cu), which was attributable to the efficiency of reduction of protons by photogenerated electrons at the loaded metal, i.e., hydrogen overvoltage of the loaded metal. TiO2 powder loaded with Cu showed higher NH3 yield and selectivity as well as higher efficiency of OA consumption. TiO2 with in situ deposited Cu gave results comparable to those of a Cu pre-loaded photocatalyst.

引用

页码：31 / 34

页数：4

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