摘要
在室温条件下,利用超声波辐照方法合成了一系列具有大比表面积的介孔结构TiO_2光催化剂。应用N_2-物理吸附、X射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)等手段对合成的样品进行了表征。考察了超声波强度、发射时间对TiO_2的结晶度、比表面积、孔体积、孔径等物理结构的影响,并提出了超声波辐照下TiO_2的介孔结构的形成机理。以λ=365 nm的紫外光为光源,评价了该系列催化剂光催化降解染料甲基橙的性能。结果表明超声波功率的增加将增加TiO_2的结晶度和孔径,并使其晶粒发生细化,提高催化剂的分散性。声化学合成的样品具有较高的光催化活性,其主要原因是超声波辐照方法合成的TiO_2具有较高的结晶度和较大的比表面积和孔体积。
A series of TiO2 photocatalyst with well mesoporous structures and high crystallinities were rapidly fabricated by ultrasonic irradiation at room temperature.The prepared samples were characterized by physical adsorption of N2,X-ray diffraction（XRD）,scanning electron microscopy（SEM）.and transmission electron microscopy（TEM）.The effects of the power and time of the ultrasonic irradiation on the crystallinity,surface area,pore volume and pore size of the TiO2 were investigated.The formation mechanism for the mesoporous TiO2 photocatalyst under ultrasonic irradiation was proposed.The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methylic orange under UV light（λ=365 nm） irradiation.The results showed that the increase of ultrasonic irradiation power will increase the crystallinity,pore size and dispersion of TiO2 and decrease the size of the grain.A high photocatalytic activity was obtained in the ultrasonic fabricated samples,which could be attributed to the high crystallinity and high surface area and pore volume of the photocatalysts.
出处
《声学学报》
EI
CSCD
北大核心
2012年第4期393-400,共8页
Acta Acustica
基金
国家自然科学基金(21067004)
江西省自然科学基金(2010GZH0048)
江西省教育厅科技项目(GJJ12344)
固体表面物理化学国家重点实验室开放基金厦门大学(200906)
关键词
超声波辐照
光催化性能
介孔结构
室温条件
TIO2
声化学合成
X射线粉末衍射
制备
Adsorption
Fabrication
Irradiation
Mesoporous materials
Photocatalysis
Photocatalysts
Photodegradation
Pore size
Scanning electron microscopy
Titanium dioxide
Transmission electron microscopy
