光稳定二氧化钛纳米管负载钯催化剂光降解甲基橙过程中的活性物种

doi:10.1016/S1872-2067(14)60213-8

催化学报 ›› 2015, Vol. 36 ›› Issue (2): 221-228.DOI: 10.1016/S1872-2067(14)60213-8

光稳定二氧化钛纳米管负载钯催化剂光降解甲基橙过程中的活性物种

胡晓静^a,b,c, 石玉坤^a,b,c, 朱宝林^b,c, 张守民^b,c, 黄唯平^a,b,c

a 天津化学化工协同创新中心, 天津300072;
b 南开大学化学学院, 先进能源材料化学教育部重点实验室, 天津300071;
c 南开大学化学学院, 天津市金属与分子基材料化学重点实验室, 天津300071

收稿日期:2014-07-04 修回日期:2014-08-18 出版日期:2015-01-21 发布日期:2015-01-21
通讯作者: 朱宝林, 黄唯平
基金资助:
国家自然科学基金(21373120, 21301098, 21071086, 21271110); 111工程(B12015); 天津市应用基础研究基金(12JCYBJC13100); 天津市自然科学基金(13JCQNJC02000).

Highly photostable palladium-loaded TiO₂ nanotubes and the active species in the photodegradation of methyl orange

Xiaojing Hu^a,b,c, Yukun Shi^a,b,c, Baolin Zhu^b,c, Shoumin Zhang^b,c, Weiping Huang^a,b,c

a Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China;
b Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China;
c Key Laboratory of Metal and Molecule-Based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China

Received:2014-07-04 Revised:2014-08-18 Online:2015-01-21 Published:2015-01-21
Supported by:
This work is supported by the National Natural Science Foundation of China (21373120, 21301098, 21071086, 21271110), the 111 Project (B12015), the Applied Basic Research Programs of Science and Technology Commission Foundation of Tianjin (12JCYBJC13100), and the Natural Science Foundation of Tianjin (13JCQNJC02000).

摘要/Abstract

摘要：

采用光沉积法制备了光稳定二氧化钛纳米管负载钯催化剂. 通过X射线衍射、紫外-可见漫反射光谱、透射电子显微镜(TEM)、氮气吸附-脱附、X射线光电子能谱(XPS)、光致发光光谱和光电流等表征手段研究了催化剂的结构和性质. TEM表明二氧化钛纳米管经光照后仍然保持良好的管状结构; XPS结果表明大部分Pd以零价形式存在. 以甲基橙溶液作为模拟废液研究了催化剂在紫外光及模拟日光条件下的光催化活性. 当Pd的负载量为0.3 wt%时, 催化剂的光催化活性最高并且优于P25的光催化活性. 另外, 通过在光降解过程中加入不同的捕获剂研究了不同氧化活性组分的作用. 结果表明, 光生空穴(h_vb⁺)在光催化降解过程中起主要作用.

关键词: 二氧化钛纳米管, 钯, 活性物种, 光降解, 甲基橙

Abstract:

Highly photostable palladium-loaded TiO₂ nanotubes (Pd/TNTs) were prepared by a simple photo-decomposition method and characterized by inductively coupled plasma, X-ray diffraction, UV-visible light diffuse reflectance spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence spectroscopy, N₂ adsorption-desorption, and photocurrent measurement. TEM images showed that the samples had a tubular structure. XPS results revealed that most of the palladium was present as Pd⁰. The photocatalytic performance was evaluated by monitoring the catalytic activity for the degradation of methyl orange solution under both UV and simulated sunlight irradiation. Pd/TNTs with 0.3 wt% Pd displayed higher activity than P25. The active species in the photocatalytic process were investigated by using different types of active species scavengers. h_vb⁺ was the major reactive species in the photodegradation over the Pd/TNTs.

Key words: Titania nanotube, Palladium, Active species, Photodegradation, Methyl orange

胡晓静, 石玉坤, 朱宝林, 张守民, 黄唯平. 光稳定二氧化钛纳米管负载钯催化剂光降解甲基橙过程中的活性物种[J]. 催化学报, 2015, 36(2): 221-228.

Xiaojing Hu, Yukun Shi, Baolin Zhu, Shoumin Zhang, Weiping Huang. Highly photostable palladium-loaded TiO₂ nanotubes and the active species in the photodegradation of methyl orange[J]. Chinese Journal of Catalysis, 2015, 36(2): 221-228.

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光稳定二氧化钛纳米管负载钯催化剂光降解甲基橙过程中的活性物种

Highly photostable palladium-loaded TiO₂ nanotubes and the active species in the photodegradation of methyl orange

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光稳定二氧化钛纳米管负载钯催化剂光降解甲基橙过程中的活性物种

Highly photostable palladium-loaded TiO2 nanotubes and the active species in the photodegradation of methyl orange

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Highly photostable palladium-loaded TiO₂ nanotubes and the active species in the photodegradation of methyl orange