Synthesis and characterization of Mo–Sb–S tridoped TiO2 nanoparticles with enhanced visible light photocatalytic activity
Synthesis and characterization of Mo–Sb–S tridoped TiO2 nanoparticles with enhanced visible light photocatalytic activity
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DOI：
10.1016/j.mssp.2014.12.024
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发表时间：
2015-03
影响因子：
4.1
通讯作者：
Deliang Li;Lingling Li;Wei Guo;Zhixian Chang;Minghua Lu
中科院分区：
文献类型：
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作者：
Deliang Li;Lingling Li;Wei Guo;Zhixian Chang;Minghua Lu
采用溶胶-凝胶法制备了一种新型的Mo-Sb-S三掺杂纳米TiO 2，该纳米TiO 2具有增强的可见光催化活性。采用X射线衍射（XRD）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、能量色散X射线衍射（EDS）、氮气吸附-脱附等温线和紫外-可见漫反射光谱等手段对催化剂进行了表征。XRD和TEM结果表明，Mo-Sb-S三掺杂TiO 2纳米粒子的平均粒径约为8-9 nm，小于Mo、Sb和S共掺杂TiO 2纳米粒子的平均粒径（11-16 nm）。以亚甲基蓝（MB）为目标染料，研究了Mo-Sb-S三掺杂纳米TiO 2的可见光催化降解性能。结果表明，所制备的Mo-Sb-S三掺杂纳米TiO 2对亚甲基蓝具有良好的降解性能。通过对Mo-Sb-S-TiO 2的结构和可见光催化活性的分析，提出了三掺杂TiO 2提高可见光催化活性的可能机理：金属元素Mo和Sb以及非金属元素S的协同作用不仅使带隙明显变窄，而且抑制了光生电子和空穴的复合，从而大大提高了其在可见光照射下的光催化活性。
In this work, a novel Mo–Sb–S tridoped TiO2nanoparticles possessing enhanced visible light photocatalytic activity were prepared by a sol–gel method. The as-prepared catalyst was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy, energy dispersive X-ray, nitrogen adsorption–desorption isotherms, and UV–vis diffuse reflectance spectroscopy. The results of XRD and TEM indicated that the average size of Mo–Sb–S tridoped TiO2nanoparticles was approximately 8–9 nm, which is smaller than that of TiO2co-doping or doping with Mo, Sb and S (11–16 nm). The photocatalytic activity of Mo–Sb–S tridoped TiO2nanoparticles was evaluated by photodegradation of methylene blue (MB) in aqueous solution under visible light irradiation. The results revealed that the prepared Mo–Sb–S tridoped TiO2nanoparticles possess excellent performance on degradation of MB. By analyzing the structure and photocatalytic activity of Mo–Sb–S–TiO2under visible light irradiation, the probable mechanism of tridoped TiO2for enhancing visible light photocatalytic activity was postulated that the co-operation of metal elements Mo and Sb as well as nonmetal elements S not only led to appreciable narrowing of the band gap, but also suppressed the recombination of the photo-generated electrons and holes, thus greatly improved the photocatalytic activity under visible light irradiation.