N, Fe共掺杂TiO2纳米材料的固相合成及其对喹啉的可见光降解

doi:10.3724/SP.J.1077.2010.00921

摘要/Abstract

摘要：

采用固相反应法分别合成了铁掺杂二氧化钛(Fe-TiO₂)及氮和铁共掺杂二氧化钛(N-Fe-TiO₂)纳米材料. 并对材料进行了XRD、SEM、UV-Vis、XPS、AAS及全自动元素分析等技术的物相织构及元素组成表征, 同时研究了催化剂对喹啉的可见光降解性能. 结果表明, 在球形的N-Fe-TiO₂纳米材料中, N以阴离子(N^3-)进入二氧化钛晶格, Fe³⁺以同晶取代方式占据TiO₂晶格中Ti的位置, 紫外-可见漫反射吸收光谱红移到600nm. N/Fe投料比的增大有助于N-Fe-TiO₂催化剂晶型的转化. 在25℃、pH=6.5下, 所制得的光催化材料对喹啉的可见光降解行为均具有较高的光催化活性, 并服从一级反应动力学规律, 而纯TiO₂对喹啉不降解. N-Fe-TiO₂(n(N₂H₄.H₂O):n(FeCl₃.6H₂O)=1:9)催化剂对喹啉的可见光降解速率常数比Fe-TiO₂大.

关键词: 氮铁共掺杂, 二氧化钛, 固相反应, 喹啉, 可见光降解

Abstract:

Fe-doped TiO₂(Fe-TiO₂) and N, Fe co-doped TiO₂ (N-Fe-TiO₂) nanomaterials were synthesized by solid-state reaction, respectively. The textural properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), ultraviolet visible light spectroscope (UV-Vis), X-ray photoelectron spectroscope (XPS). The components of the samples were determined by atomic absorption spectrum (AAS) and automatic elemental analyzer. Moreover, the photodegradation properties of quinoline irradiated under visible light on the materials were investigated. The results show that N atoms as N^3- states are incorporated into the lattice of TiO₂, and Fe³⁺ ions occupy the sites of Ti⁴⁺ by isomorphous replacement in the spheric shape N-Fe-TiO₂nanomaterials. The UV-Vis absorption onset of the N-Fe-TiO₂ samples extends well into the visible region at 600 nm. Furthermore, an increase of the initial ratio of N₂H₄·H₂O to FeCl₃·6H₂O enhances the phase transformation of N-Fe-TiO₂catalysts. At 25℃, pH=6.5, the rule of pseudo-first-order reaction and excellent photocatalytic activity on the N-Fe-TiO₂ catalysts are found in the process of photodegradation of quinoline. However, quinoline can not be degradated by pure TiO₂under visible light irradiation. The reaction rate constant of N-Fe-TiO₂ (n(N₂H₄.H₂O): n(FeCl₃.6H₂O)=1:9) catalyst is higher than that of pure TiO₂ powder.

Key words: N and Fe co-doping, titanium dioxide, solid state reaction, quinoline, visible light degradation

中图分类号:

TB34

刘少友, 唐文华, 冯庆革, 李举志, 孙建华. N, Fe共掺杂TiO₂纳米材料的固相合成及其对喹啉的可见光降解[J]. 无机材料学报, 2010, 25(9): 921-927.

LIU Shao-You, TANG Wen-Hua, FENG Qing-Ge, LI Ju-Zhi, SUN Jian-Hua. Synthesis of N, Fe Co-doped TiO₂ Nanomaterials via Solid State Reaction and Their Photodegradation of Quinoline Irradiated under Visible Light[J]. Journal of Inorganic Materials, 2010, 25(9): 921-927.

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N, Fe共掺杂TiO₂纳米材料的固相合成及其对喹啉的可见光降解

Synthesis of N, Fe Co-doped TiO₂ Nanomaterials via Solid State Reaction and Their Photodegradation of Quinoline Irradiated under Visible Light

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