Synthesis and application of novel mesoporous-assembled SrTixZr1-xO3-based nanocrystal photocatalysts for azo dye degradation

被引：14
作者：
Khunrattanaphon, Pattharin [1 ]
Chavadej, Sumaeth [1 ,2 ]
Sreethawong, Thammanoon [1 ,2 ]
机构：
[1] Chulalongkorn Univ, Petr & Petrochem Coll, Bangkok 10330, Thailand
[2] Chulalongkorn Univ, Ctr Petr Petrochem & Adv Mat, Bangkok 10330, Thailand
来源：
CHEMICAL ENGINEERING JOURNAL | 2011年 / 170卷 / 01期
关键词：
SrTixZr1-xO3; Nanocrystal; Mesoporous assembly; Photocatalysis; Azo dye; Degradation; WASTE-WATER TREATMENT; ORGANIC-DYES; HYDROGEN EVOLUTION; SRTIO3;
D O I：
10.1016/j.cej.2011.03.055
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this work, novel mesoporous-assembled SrTixZr1-xO3 nanocrystal photocatalysts were successfully synthesized by a sol-gel process with the aid of a structure-directing surfactant under mild conditions. The photocatalytic activity of the synthesized photocatalysts for degradation of Acid Black (AB) diazo dye used as a model contaminant in textile wastewater was investigated by varying Ti-to-Zr molar fraction, calcination conditions, and Pt loading. The synthesized photocatalysts were systematically characterized by TG-DTA. N-2 adsorption-desorption analysis, XRD. UV-visible spectroscopy. SEM-EDX, TEM-EDX. TPR, and H-2 chemisorption. The photocatalytic activity results showed that without Pt loading, the mesoporous-assembled SrTixZr1-xO3 photocatalyst with a Ti-to-Zr molar fraction of 0.9:0.1 (i.e. SrTi0.9Zr0.1O3) calcined at 700 degrees C for 4h provided a maximum degradation rate constant as compared to the other SrTixZr1-xO3 photocatalysts. The optimum Pt loading of 1 wt.% by a single-step sol-gel method on the mesoporous-assembled SrTi0.9Zr0.1O3 photocatalyst was found to greatly increase the degradation rate constant of the AB dye. Furthermore, the calcination temperature was found to significantly affect the degradation rate constant of the Pt-loaded mesoporous-assembled SrTi0.9Zr0.1O3 photocatalyst. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：292 / 307
页数：16
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