Effect of the agglomeration of TiO2 nanoparticles on their photocatalytic performance in the aqueous phase

被引：143

作者：

Li, Gang ^{[1
]}

Lv, Lu ^{[1
]}

Fan, Haitao ^{[2
]}

Ma, Junyan ^{[2
]}

Li, Yanqiang ^{[2
]}

Wan, Yong ^{[2
]}

Zhao, X. S. ^{[1
,2
]}

机构：

[1] Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 117576, Singapore

[2] Qingdao Univ, Growing Basis State Key Lab, Lab New Fiber Mat & Modern Text, Inst Multifunct Mat, Qingdao 266071, Peoples R China

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2010年 / 348卷 / 02期

关键词：

Colloidal TiO2; Agglomeration; Photocatalysis; Zeta potential; TITANIUM-DIOXIDE NANOPARTICLES; ANIONIC SURFACTANTS; ORANGE-II; AGGREGATION; ADSORPTION; DEGRADATION; PARTICLES; PH; SUSPENSIONS; REDISPERSION;

D O I：

10.1016/j.jcis.2010.04.045

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：

TiO2 nanoparticles have been widely explored as photocatalysts in the degradation of organic matters present in water. However, spontaneous agglomeration of TiO2 nanoparticles in a suspension is a crucial issue that must be addressed before the photocatalyst can be used for water treatment. In the present work, the nature of the agglomeration of TiO2 nanoparticles in aqueous suspension was investigated. Two approaches to minimize the agglomeration of colloidal TiO2 particles were investigated. A careful control over the pH of the system was found to be an effective method for stabilizing colloidal TiO2 particles and to significantly enhance the adsorption of orange II. As a result, the overall photocatalytic degradation rate was greatly accelerated. In addition to pH control, modification of TiO2 particles using polyelectrolyte poly allylamine hydrochloride (PAH) was observed to be an effective approach for preventing colloidal TiO2 particles from agglomeration. (C) 2010 Elsevier Inc. All rights reserved.

引用

页码：342 / 347

页数：6

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