WO3/TiO2 composite with morphology change via hydrothermal template-free route as an efficient visible light photocatalyst

WO3/TiO2 composite with morphology change via hydrothermal template-free route as an efficient visible light photocatalyst
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通过水热无模板途径改变形貌的 WO3/TiO2 复合材料作为高效可见光光催化剂

DOI:
10.1016/j.cej.2010.11.065
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发表时间:
2011-02
影响因子:
15.1
通讯作者:
Sajjad Leghari, Shamaila Sajjad , Feng Chen, Jinl
Sajjad Leghari, Shamaila Sajjad , Feng Chen, Jinl
中科院分区:
工程技术1区
文献类型:
--
作者:
Sajjad Leghari, Shamaila Sajjad , Feng Chen, Jinl

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采用无模板水热法制备了WO 3/TiO 2复合材料,通过改变钨酸铵的浓度,制备了纳米颗粒和微球。5.0%的复合物一般以松散的聚集体纳米粒子存在。在10.0%WO3/TiO 2体系中,由于硫酸铵在过饱和状态下原位生成,这些颗粒聚集形成了独特的微球形貌。在紫外和可见光下,5.0%的复合光催化剂对甲基橙子和2,4-二氯苯酚的光催化降解效果优于纯TiO 2、P-25和纯WO 3。10.0%WO3/TiO 2复合材料具有较高的掺杂量,但由于其特殊的球形形貌,具有相当高的活性。光催化剂的形貌变化也影响光催化效率。由于独特的结构特征和钨掺杂的综合作用,催化剂表现出高活性。掺杂的钨(W)抑制电子-空穴复合速率。有机物降解动力学符合Langmuir-Hinshelwood模型。
The WO3/TiO2composites are prepared by a template-free synthetic approach based on hydrothermal reaction that leads to the formation of nanoparticles and microspheres with the change in concentrations of ammonium tungstate used as a dopant precursor. 5.0% composite generally exists in loose aggregate nanoparticles. These particles are aggregated to form the peculiar morphology of microspheres at 10.0% WO3/TiO2due to the in situ formation of ammonium sulfate in supersaturated state. 5.0% composite exhibits the best photoactivity as compared to pure TiO2, P-25 and pure WO3in the degradation of methyl orange and 2, 4-dichlorophenol in UV and visible light. 10.0% WO3/TiO2composite contains more dopant contents but exhibits comparable higher activity due to its specific morphology of spheres. Morphological variations of a photocatalyst also influence the photocatalytic efficiencies. Catalysts exhibit high activity owing to the combined effects of both the unique structural characteristics and the tungsten doping. The doped tungsten (W) inhibits the electron–hole recombination rate. The kinetics of the organics degradation is found to follow the Langmuir–Hinshelwood model.
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