N 掺杂TiO<sub>2</sub> 纳米粒子表面光生电荷特性与光催化活性

引用本文: 张晓茹, 林艳红, 张健夫, 何冬青, 王德军. N 掺杂TiO₂ 纳米粒子表面光生电荷特性与光催化活性[J]. 物理化学学报, 2010, 26(10): 2733-2738. doi: 10.3866/PKU.WHXB20101007 shu

Citation: ZHANG Xiao-Ru, LIN Yan-Hong, ZHANG Jian-Fu, HE Dong-Qing, WANG De-Jun. Photoinduced Charge Carrier Properties and Photocatalytic Activity of N-Doped TiO₂ Nanocatalysts[J]. Acta Physico-Chimica Sinica, 2010, 26(10): 2733-2738. doi: 10.3866/PKU.WHXB20101007 shu

N 掺杂TiO₂ 纳米粒子表面光生电荷特性与光催化活性

基金项目:
国家重点基础研究发展规划项目(973) (2007CB613303) (973) (2007CB613303)

国家自然科学基金(20703020, 20873053) (20703020, 20873053)

吉林大学科学前沿与交叉学科创新项目(421031401412)资助 (421031401412)

摘要:

以尿素为氮源, 采用水热法制备了不同N 掺杂量的TiO₂ (N-TiO₂)光催化剂. 利用X 射线衍射(XRD), 紫外-可见漫反射光谱(UV-Vis DRS),X 射线光电子能谱(XPS) 及荧光(PL) 光谱等技术对其进行了系统的表征. 以罗丹明B (RhB) 和甲基橙(MO) 溶液的脱色降解为模型反应, 分别考察了N-TiO₂ 光催化剂在紫外和可见光区的光催化活性. 利用表面光伏(SPV) 和瞬态光伏(TPV) 技术研究了N-TiO₂ 纳米粒子表面光生电荷的产生和传输机制, 并探讨了光生电荷与光催化活性之间的关系. 结果显示, 随着N 含量的增大, TiO₂ 表面光伏响应阈值红移, 可见光部分光电压响应强度逐渐增强, 瞬态光伏响应达到最大值的时间亦有着不同程度的延迟. 这表明适量的N 掺杂能够提高TiO₂ 纳米粒子中光生载流子的分离效率, 相应地延长载流子的传输时间, 增加光生电荷的寿命, 从而促进其光催化活性; 而过量的N 掺杂则增加了TiO₂ 纳米粒子中光生载流子的复合中心, 抑制其光催化活性.

关键词:

English

Photoinduced Charge Carrier Properties and Photocatalytic Activity of N-Doped TiO₂ Nanocatalysts

1.
College of Chemistry, Jilin University, Changchun 130012, P. R. China
Received Date: 21 May 2010
Available Online: 27 September 2010
Fund Project:
国家重点基础研究发展规划项目(973) (2007CB613303)

国家自然科学基金(20703020, 20873053)

吉林大学科学前沿与交叉学科创新项目(421031401412)资助

Abstract:

Nitrogen-doped TiO₂ (N-TiO₂) photocatalysts with different amounts of N doping were successfully synthesized by the hydrothermal method using urea as the nitrogen source. The samples were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV -Vis DRS),X -ray photoelectron spectroscopy (XPS), and photoluminescence (PL) spectroscopy. The photodegradation of rhodamineB (RhB) and methyl orange (MO) solutions was used to evaluate the photocatalytic activity of the catalysts under UV and visible light irradiation. Surface photovoltage (SPV) and transient photovoltage (TPV) techniques were used to investigate the separation and transport mechanism of the photogenerated charge carriers of the N-doped TiO₂ nanoparticles. The relationship between the photogenerated charge carriers and photocatalytic activity was also discussed. The results showed that the SPV threshold values shifted to the visible region and a stronger photovoltaic response in the visible region was observed with an increase in N doping. We also found that the maximum TPV response time was different for N-TiO₂. These results indicate that with an appropriate amount of N doping, the photoinduced charge carriers separate efficiently, the transmission time increases, and the lifetime of the photoinduced charge carriers increases. Therefore, the photocatalytic activity is enhanced. However, excessive N acts as recombination centers for photoinduced electrons and holes, which reduces their photocatalytic activity.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

N 掺杂TiO₂ 纳米粒子表面光生电荷特性与光催化活性

English

Photoinduced Charge Carrier Properties and Photocatalytic Activity of N-Doped TiO₂ Nanocatalysts

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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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

N 掺杂TiO2 纳米粒子表面光生电荷特性与光催化活性

English

Photoinduced Charge Carrier Properties and Photocatalytic Activity of N-Doped TiO2 Nanocatalysts

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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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

N 掺杂TiO₂ 纳米粒子表面光生电荷特性与光催化活性

Photoinduced Charge Carrier Properties and Photocatalytic Activity of N-Doped TiO₂ Nanocatalysts

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs