Visible-light-sensitive Na-doped p-type flower-like ZnO photocatalysts synthesized via a continuous flow microreactor

被引：48

作者：

Kim, Ki-Joong ^{[1
]}

Kreider, Peter B. ^{[1
]}

Choi, Changho ^{[1
]}

Chang, Chih-Hung ^{[1
]}

Ahn, Ho-Geun ^{[2
]}

机构：

[1] Oregon State Univ, Sch Chem Biol & Environm Engn, Corvallis, OR 97331 USA

[2] Sunchon Natl Univ, Dept Chem Engn, Sunchon 540742, Jeonnam, South Korea

来源：

RSC ADVANCES | 2013年 / 3卷 / 31期

基金：

美国国家科学基金会;

关键词：

THIN-FILM; GREEN LUMINESCENCE; OPTICAL-PROPERTIES; PHOTOLUMINESCENCE; NANOSTRUCTURES; NANOWIRES; HOMOJUNCTION; NANOCRYSTALS; MECHANISM; GROWTH;

D O I：

10.1039/c3ra41866a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A Na-doped p-type flower-like ZnO photocatalyst (Na:ZnO) that is highly visible-light-sensitive in air at room temperature was synthesized by a continuous flow microreactor, where NaOH was used as both the precipitating and doping agent. The results of various characterization techniques (XPS, ICP, ToF-SIMS, XRD, and HRTEM) indicated that the Na ions have been successfully doped into the ZnO lattice. The Na: ZnO demonstrated a much higher photocatalytic degradation rate of methylene blue under simulated sunlight (lambda(max) = 494 nm) than the rates obtained from commercially available TiO2 photocatalysts (P-25) and pure ZnO. This much enhanced rate is likely a result of increased surface defect sites associated with oxygen when Na replaces Zn in the crystal structure. A possible mechanism of the photocatalytic degradation of methylene blue on the Na: ZnO is suggested.

引用

页码：12702 / 12710

页数：9

共 64 条

[1] Ce-doped ZnO (CexZn1-xO) becomes an efficient visible-light-sensitive photocatalyst by co-catalyst (Cu2+) grafting [J].