微波干燥制备纳米TiO2的光催化降解活性研究

采用钛酸丁酯的溶胶-凝胶法及微波干燥制备了纳米TiO2光催化剂。通过XRD和BET进行了晶型、平均粒径和比表面积分析表征。以水杨酸为模拟污染物对其进行光催化降解活性实验研究表明，UV光照40min水杨酸降解率达到97％，催化剂重复使用4次水杨酸降解率仍能达到94％。     

Preparation and Characterization of Organic/Inorganic Hybrid Nanofibers

A new class of nanocomposites based on organic and inorganic species integrated at a nanoscale has obtained more attention these years. Organic-inorganic hybrids have both the advantages of organic materials, such as light weight, flexibility and good moldability, and inorganic materials, such as high strength, heat stability and chemical resistance. In this work, PVAc/TiO2 organicinorganic hybrid was prepared by sol-gel process. Eiectrospinning technique was used to fabricate PVAc/TiO2 hybrid nanofibers. The structures and properties of the hybrid nanofibers were characterized by Scanning Electron Microscopy （SEM）, Atomic Force Microscope （AFM）, Differential Scanning Calorimeter （DSC） and Fouriertransform infrared （FTIR） spectra. SEM and AFM were employed to study the topography of the hybrid nanofibers. The chemical structure of the hybrid nanofibers were examined by FTIR. The DSC scans revealed the second order transition temperature of the hybrid materials were higher than PVAc.     

Synthesis and Characterization of Titania and Rare Earth Doped Titania Nanoparticles by Sol-gel Process

Titania sol has been prepared by the sol-gel process with Ti（OC4H9）4, as precursor. TiO2 gel was obtained through hydrolysis and condensation process. Rare earth such as La2O3, CeO2 and Gd2O3 were introduced into the nanostructure TiO2. After TiO2 and rare earth doped TiO2 powders were calcined at 400℃, 500℃, 600℃, 700℃ and 800℃ respectively, the characteristic analyses of the TiO2 samples were studied by UV-VIS, XRD and TEM etc. It was found that there are some stringer absorption peaks at 200 - 325 nm. The rare earth doping can increase the phase transition temperature convertin8 anatase phase into rutile phase, can decrease the grain size of TiO2particles and can improve the ann-UV capacity of the coating fabrics.     

SO2-4/TiO2-Al2O3催化均四甲苯氧化副产物与异辛醇反应

以均四甲苯氧化反应副产物预处理后得到的混合酸和异辛醇为原料,在固体超强酸SO2-4/TiO2-Al2O3作用下进行合成混合酯的研究.考察了催化剂用量、异辛醇与混合酸的质量比、反应时间等因素对酯化反应的影响,确定了较佳的反应工艺条件:m(催化剂):m(异辛醇):m(混合酸)=0.01:3.18:1,反应时间为3 h,在此反应条件下预处理后的混合酸转化率可达到99.9%.     

掺杂铜和钒的纳米二氧化钛的光催化性能

采用溶胶-凝胶-水热后处理法制备掺杂铜和钒的纳米二氧化钛，并对所得的纳米二氧化钛光催化剂的成分、结构与光催化性能的关系进行研究。用X射线衍射、荧光光谱、紫外-可见漫反射光谱对其进行分析。研究结果表明：其晶粒直径约为6nm；电子-空穴分离效率提高；对可见光响应显著增强。通过光催化降解模拟实验，发现该二氧化钛粉末对甲基橙有机废水的降解率达到97．9％，所得到的掺杂纳米二氧化钛光催化剂扩大了对可见光响应范围，提高了光催化降解效率。     

Preparation and characterization of aligned carbon nanotubes coated with titania nanoparticles

Titania (TiO2) is an environmental-friendly photo- catalyst material with high stability and efficiency, so its preparation methods received extensive atten- tion[1―4], and the products were advanced from dis- persed nano-powder and fastness nano-film[5,…     

人造沸石负载TiO2光催化降解水中苯酚的研究

采用溶胶-凝胶法制备人造沸石负载型TiO2光催化剂，用XRD分析了其晶型结构，以300W中压汞灯为实验光源对苯酚进行了光降解研究。考察了催化剂热处理温度、TiO2负载量、催化剂用量、降解温度、光强度和H2O2用量等因素对降解率的影响。结果表明，浓度为15mg／L的苯酚溶液，催化剂焙烧温度为5000℃，TiO2负载量为15．7％，用量为2～3g／L，在300℃连续光照3h时，苯酚溶液的降解率可达到87．4％。     

N掺杂TiO2的制备、表征及其光催化性能

采用水热法制备了N掺杂TiO2光催化剂,并用X衍射、X光电子能谱和紫外-可见吸收光谱进行了表征,测定了其光催化氧化甲基橙的催化性能.结果表明,与未掺杂TiO2相比,N掺杂TiO2在可见光区有更大的吸收,N的掺杂还明显提高了TiO2光催化氧化甲基橙的性能.     

Fe/TiO2光催化降解苯系物的研究

利用自制的Fe/TiO2催化剂对苯和甲苯进行气-固相光催化降解.通过实验,得出了铁离子的最佳掺杂浓度,并对水蒸气含量、紫外灯光强等反应条件进行了研究,同时对甲苯的反应动力学进行了探讨.     

溶胶凝胶法制备平整TiO2薄膜及其表征

以钛酸四丁酯为前驱体，通过溶胶凝胶法制备表面平整、致密的TiO2薄膜，并且通过热重分析仪（TGA）、X射线衍射仪（XRD）、衰减全反射红外线光谱分析仪（ATR—IR）、扫描电子显微镜（SEM）、原子力显微镜（AFM）和接触角测量仪等研究TiO2薄膜的晶相、组成和表面的微观结构、润湿性。利用TiO2薄膜表面部分覆盖的十八烷基三氯硅烷自组装单分子层在紫外光照下的降解来研究其光催化性能，并且用水在该薄膜上的接触角的变化来表征十八烷基三氟硅烷的降解量。研究结果表明：TiO2薄膜具有很低的粗糙度，透明的锐钛矿相薄膜在较弱的紫外光照强度下具有较好的光催化性能，在自清洁和光学薄膜领域有潜在的应用前案。