摘要
Mesoporous Technische Universiteit Delft（TUD-1）-supported chromium oxide-doped titania（Cr-TiO2） was developed as a promising photocatalyst for phenol photodegradation under visible light irradiation.Low-angle X-ray diffraction and Fourier transform infrared spectroscopy results confirmed the amorphous and mesoporous silicate framework of TUD-1 in TUD-1-supported Cr-TiO2.The mesostructure of TUD-1 was further verified via N2 adsorption-desorption analysis,which showed a type-IV isotherm with a narrow average pore size distribution of 3.9 nm and high surface area of 490 m^2/g.Transmission electron microscopy analysis results indicated that TUD-1-supported Cr-TiO2 contained nanoparticles and porous channels.An increase in band gap energy was observed after loading Cr-TiO2 into TUD-1.Compared with that of unsupported Cr-TiO2,TUD-1-supported Cr-TiO2 showed higher photocatalytic activity for phenol degradation under visible light irradiation.The TUD-1 supported Cr-TiO2 photocatalyst with a Si/Ti molar ratio of 30 exhibited the highest photodegradation of phenol（82%） of the prepared samples.The photodegradation of phenol by the supported catalyst followed the Langmuir adsorption isotherm with first-order kinetics.
中孔的TUD-1负载的氧化铬掺杂TiO_2(Cr-TiO_2)有望用于紫外光照射下光催化降解苯酚的催化剂.低角X射线衍射和红外结果证实该样品中TUD-1存在无定形和中孔硅酸盐框架.TUD-1的中孔结构进一步得到N_2吸附-脱附的证实:为IV型等温线,并具有窄的孔径分布(3.9 nm)和高的比表面积(>490 m^2/g).透射电镜结果表明,所制样品保持了纳米颗粒和多孔孔道结构.TUD-1中负载Cr-TiO_2后使得带隙能量增加.与未负载的Cr-TiO_2相比,所有TUD-1负载的Cr-TiO_2光催化剂表现出更高的紫外光下降解苯酚的活性.其中Si/Ti摩尔比为30的Cr-TiO_2/TUD-1样品的光催化活性最高(82%).苯酚的光催化降解遵循一级Langmuir吸附等温线.
基金
the Ministry of Higher Education,Malaysia and Universiti Teknologi Malaysia(UTM) for the financial supports through Research University Grants (Q.J130000.2426.03G35 and Q.J130000.2526.10H54)
