以钛酸四丁酯为钛源,以三嵌段共聚物F127为模板剂,采用溶剂挥发诱导自组装法(EISA)制备Co、N共掺杂介孔TiO2,用XRD、TEM、SEM、XPS、N2吸附-脱附法和能谱等手段对材料的结构和形貌进行了表征.用紫外-可见吸收光谱法考察了催化剂对罗丹明B(RhB)和无色小分子2,4-二氯苯酚(DCP)的光催化降解效率.结果表明,样品具有较窄的孔径分布(3.65 nm),Co、N共掺杂介孔TiO2后TiO2的吸收范围扩展到可见光区,当用氙灯(模拟太阳光,500W,λ＞420 nm)光源对RhB和DCP进行光催化降解时,其光催化活性明显高于P25(纯TiO2)和Co掺杂介孔TiO2.对RhB和DCP分别光照120 min后,降解效率达到98.5％和66.3％以上.
The Co and N co-doped mesoporous TiO2 was successfully synthesized by an evaporation-induced self-assembly process,using tetrabutyl titanate as a Ti source and triblock copolymer F127 as a template.The crystal structure and morphology of the synthesized mesoporous TiO2 was characterized by means of XRD,TEM,SEM,EDX,XPS,and physical adsorption instrument.Photocatalytic activity of the photocatalyst was investigated through degradation of Rhodamine B (RhB) and 2,4-dichlorophenol (DCP) by UV-visible absorption spectrometry.The results show that the Co and N co-doped mesoporous TiO2 presents a narrow pore size distribution (3.65 nm),and of which the light absorption band of photocatalyst was extended to visible light area after the Co and N co-doped mesoporous TiO2,with a photocatalytic activity is significantly higher than that of the P25(pure TiO2) and Co doped mesoporous TiO2.Under visible light illumination (500 W xenon lamp,λ＞420 nm) for the Co and N co-doped mesoporous TiO2 photocatalysts exhibited excellent photocatalytic activity with,and the RhB and DCP degradation efficiencies y for RhB and DCP were as up to 98.3％ and 66.3％ respectively after irradiation 120 min.
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