Synthesis and photocatalytic activity of hydroxyapatite modified nitrogen-doped TiO2
Synthesis and photocatalytic activity of hydroxyapatite modified nitrogen-doped TiO2
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DOI：
10.1016/j.matchemphys.2011.05.021
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发表时间：
2011-09
影响因子：
4.6
通讯作者：
Yingle Liu;Q. Yang;Jianhong Wei;R. Xiong;Chun-Xu Pan;J. Shi
中科院分区：
文献类型：
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作者：
Yingle Liu;Q. Yang;Jianhong Wei;R. Xiong;Chun-Xu Pan;J. Shi
TiO 2是一种很有前途的光催化剂，可用于光催化降解有害有机污染物，但由于其吸附能力、量子产率低，且不能充分利用可见光等原因，阻碍了其实际应用。为了将TiO 2光催化剂的光吸收范围向可见光扩展，提高其光催化活性，采用湿化学法合成了一种新型光催化剂HAP-N-TiO 2。采用X射线衍射、透射电子显微镜、X射线光电子能谱、氮吸附-脱附等温线、紫外-可见吸收光谱和光电流等测试手段对HAP-N-TiO 2的性能进行了研究。在可见光照射下，以丙酮为目标气体，考察了样品的光催化活性。研究结果表明，在可见光照射下，10%-HAP-N-TiO 2样品的光催化活性最好，明显优于其他样品的上级。其显著的光催化活性可能是由于羟基磷灰石的吸附和二氧化钛的光催化活性之间的协同作用。N-掺杂使复合材料在可见光照射下也具有活性。
TiO2is a promising material as a photocatalyst for photodecomposition of hazardous organic pollutants under illumination, however, the low adsorption abilities, quantum yields and the lack of visible-light utilization hinder its practical application. In an attempt to extend light absorption of the TiO2-based photocatalyst towards the visible light range and improve its photocatalytic activity, a new photocatalyst, HAP-modified N-TiO2(HAP-N-TiO2) was synthesized by a facile wet chemical method. The properties of HAP-N-TiO2were investigated by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, nitrogen adsorption–desorption isotherm measurement, UV–visible absorption spectroscopy, and photocurrent measurement. The photocatalytic activity of the samples was evaluated by the decomposition of gaseous acetone under visible light irradiation. The research results demonstrated that 10%-HAP-N-TiO2sample shows the best photocatalytic activity, which is much superior to the other samples under visible light irradiation. The remarkable photocatalytic activity may arise from the synergism between adsorption on hydroxyapatite and photoactivity by titania. N-doping makes the composite also active under visible-light irradiation.