摘要
以钛酸纳米管为前驱体,通过共沉淀-煅烧的方法制备得到了AgBr/纳米管钛酸复合材料。透射电镜(TEM)和X射线衍射分析(XRD)结果表明,经过不同温度的焙烧,钛酸纳米管的形貌由一维管状逐渐转变为颗粒状,晶体结构也由正交晶系转化为锐钛矿结构;紫外-可见漫反射光谱(UV-Vis DRS)表明,担载的AgBr明显拓展了纳米管钛酸的可见光吸收范围;X射线光电子能谱(XPS)对样品中Ag元素的价态进行了分析,Ag物种主要以Ag+形式存在。以甲基橙(MO)的可见光降解为探针反应,结果表明,当煅烧温度为200℃时,光催化活性最高,MO的降解率在30min内就达到了90%以上;随着煅烧温度的增加,催化活性有逐渐降低的趋势。
AgBr/titanic acid nanotubes （TAN） nanocomposites were prepared by the copreeipitation-calcination method. TEM images showed that the one-dimensional morphology of titanic acid nanotubes transformed into nanoparticles as the increase of the calcination temperature. And the XRD results illustrated that the crystal structure of TAN transformed from the orthorhombic into anatase. The UV-Vis DRS spectra indicated that the absorption of TAN was significantly expand after sensitization by AgBr nanoparticles. The presence of the surface Ag species in the AgBr/TAN composites was estimated to be Ag^＋ by XPS analysis. The photo-degradation of methyl orange （MO） was selected as the model chemicals to evaluate the photocatalytic activity of AgBr/ TAN composites. AgBr/TAN-200 showed the highest photocatalytic activity, the degradation yield of MO reached more than 90% within 30min. As the increase of the calcined temperature, the photoeatalytie activity of AgBr/TAN decreased gradually.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2013年第8期1168-1171,1176,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(21103042)
高等学校博士点基金资助项目(20114103120001)
河南大学科研基金资助项目(2010YBZR013)
关键词
纳米管钛酸
AGBR
光催化
纳米复合材料
titanic acid nanotubes
silver bromide
photocatalysis
nanocomposites
