Zr/Ti摩尔比对锶锆钛复合氧化物在可见光下光催化性能的影响

引用本文: 黄海凤, 贾建明, 卢晗锋, 张宏华, 潘烈群. Zr/Ti摩尔比对锶锆钛复合氧化物在可见光下光催化性能的影响[J]. 物理化学学报, 2013, 29(06): 1319-1326. doi: 10.3866/PKU.WHXB201304012 shu

Citation: HUANG Hai-Feng, JIA Jian-Ming, LU Han-Feng, ZHANG Hong-Hua, PAN Lie-Qun. Effect of Designed Zr/Ti Molar Ratio on the Photocatalytic Activity of Sr-Zr-Ti Mixed Oxide Catalysts under Visible Light[J]. Acta Physico-Chimica Sinica, 2013, 29(06): 1319-1326. doi: 10.3866/PKU.WHXB201304012 shu

Zr/Ti摩尔比对锶锆钛复合氧化物在可见光下光催化性能的影响

基金项目:
国家自然科学基金(21107096)资助项目 (21107096)

摘要:

通过分步沉积法制备了不同Zr/Ti 摩尔比的锶锆钛(SZT)复合氧化物催化剂, 以X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、紫外-可见(UV-Vis)漫反射光谱等表征手段考察不同Zr/Ti 摩尔比下SZT催化剂的结构形态, 以可见光下光催化降解亚甲基蓝为模型反应考察样品的光催化活性. 结果表明: Zr/Ti 摩尔比<1 时SZT催化剂发生Zr⁴⁺与Ti⁴⁺同质替换, 引起晶格缺陷, 光催化活性小幅提高; Zr/Ti 摩尔比≥1 时SZT催化剂产生SrZrO₃/Ti_nO_2n-1 (n=4, 9)的新晶相, Ti_nO_2n-1 (n=4, 9)的存在有利于光生电子-空穴的传导与分离, 可大幅提高催化剂光催化活性. 其中, SZT-5/5 表现出最高的光催化活性, 其一级反应速率常数达到0.2133 min^-1, 是同等光照条件下纯SrTiO₃样品(0.0158 min^-1)的13.5倍.

关键词:

English

Effect of Designed Zr/Ti Molar Ratio on the Photocatalytic Activity of Sr-Zr-Ti Mixed Oxide Catalysts under Visible Light

1.
1 College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China;
2 Research Institute of Catalytic Reaction Engineering, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China;
3 Environmental Monitoring Station of Fuyang City, Fuyang 311400, Zhejiang Province, P. R. China
Received Date: 20 November 2012
Available Online: 17 May 2013
Fund Project:
国家自然科学基金(21107096)资助项目

Abstract:

A series of Sr-Zr-Ti (SZT) mixed oxide catalysts were prepared by a fractional-precipitation method. These photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and ultraviolet visible (UV-Vis) diffuse reflectance absorption spectra. Photocatalytic degradation of methylene blue was investigated to determine the photoactivity of the catalyst. It was shown that with a Zr/Ti ratio<1, the SZT mixed oxide catalysts showed improved photocatalytic activity. This was attributed to lattice defects creating active photocatalytic sites because of Zr⁴⁺ doping. For Zr/Ti ratios ≥1, the catalysts showed markedly improved photocatalytic activity because of new crystalline phases of SrZrO₃ and Ti_nO_2n-1 (n=4, 9)that facilitated splitting and conduction for electron/hole. Typical SZT samples (Zr/Ti=4) showed the highest photocatalytic activity, with first-order reaction rate constant 13.5 times that of a SrTiO₃ sample.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

Zr/Ti摩尔比对锶锆钛复合氧化物在可见光下光催化性能的影响

English

Effect of Designed Zr/Ti Molar Ratio on the Photocatalytic Activity of Sr-Zr-Ti Mixed Oxide Catalysts under Visible Light

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

Zr/Ti摩尔比对锶锆钛复合氧化物在可见光下光催化性能的影响

English

Effect of Designed Zr/Ti Molar Ratio on the Photocatalytic Activity of Sr-Zr-Ti Mixed Oxide Catalysts under Visible Light

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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