文献类型：期刊文献

中文题名：TiO_(2)/TiSi_(2)复合材料的制备及其可见光光催化性能

英文题名：Facile Synthesis of TiO_(2)/TiSi_(2)Composite with Enhanced Visible-Light Photocatalytic Properties

作者：刘胜优[1];杨晓华[1];杨化桂[1]

机构：[1]华东理工大学材料科学与工程学院,超细材料制备与应用教育部重点实验室,上海200237

年份：2018

卷号：44

期号：3

起止页码：356

中文期刊名：华东理工大学学报(自然科学版)

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2017_2018】；

基金：国家自然科学基金(21373083);中央高校基本科研业务费(WD1514003);上海市教育委员会和上海市教育发展基金会“晨光计划”(13CG27)

语种：中文

中文关键词：TiO_(2)/TiSi_(2)复合材料;金红石型TiO_(2);可见光响应;光催化降解

外文关键词：TiO_(2)/TiSi_(2)composite;futile TiO2;visible light response;photocatalytic degradation

摘要：分别以TiSi_(2)和HCl为钛源和形貌控制剂,采用一步水热法合成了海胆状TiO_(2)/TiSi_(2)纳米复合材料。TiO_(2)/TiSi_(2)是由TiSi_(2)基体与生长在TiSi_(2)表面的海胆状金红石型TiO_(2)组成,其中,金红石型TiO_(2)由大量尺寸均匀、表面光洁、沿[001]晶向生长的纳米棒组成。随着盐酸浓度的增加,TiO_(2)纳米棒会由棒状转变为锥状。性能测试发现,相比于纯相的金红石型TiO_(2),TiO_(2)/TiSi_(2)复合材料在可见光区域具备较好的光吸收性能和较高的光催化降解甲基橙效率。
TiO_(2)has attracted intensive attention owning to its nontoxicity,low cost,superhydrophilicity,long-term chemical stability and high photocatalytic activity.Various synthetic strategies for this important semiconductor have been attempted so far,usually using titanium(Ⅲ/Ⅳ)halide or alkoxide compounds as the titanium source.In this paper,urchin-like TiO_(2)/TiSi_(2)composite was developed by a facile one-pot hydrothermal method,using TiSi_(2)and HCl as the Ti precursor and morphology control agent respectively.The hydrothermal reaction was performed by using polytetrafluoroethylene(PTFE)-lined stainless steel autoclave as reactor in an oven and kept at 180℃for 18 h.The as-prepared samples were characterized systematically by X-ray diffraction(XRD),field emission scanning electron microscope(FE-SEM),transmission electron microscope(TEM),X-ray photoelectron spectroscope(XPS)and UVvisible absorption spectra(UV-vis).Results indicated that the urchin-like TiO_(2)assembled by nanorods grown on TiSi_(2)substrate was confirmed to grow along[001]orientation and exhibited uniform size and smooth surfaces.In addition,the tips of TiO_(2)nanorods presented pyramid tetrahedron shape and could convert to cone shape with increasing the concentration of HCl aqueous solution.Furthermore,compared with pure rutile TiO_(2),TiO_(2)/TiSi_(2)composite showed a higher absorption in visible light.Thus,the significant enhanced photodegradation efficiency of the organic pollutants with the TiO_(2)/TiSi_(2)composite under visible light irradiation was obtained.The photodegradation rates of methyl orange were measured which confirmed the highest performance of the TiO_(2)/TiSi_(2)composite in comparison to pure rutile TiO_(2)and TiSi_(2).