The hemocompatibility and the reabsorption function of TiO2 nanotubes biomembranes

A novel high-intensity TiO2 nanotubes array membrane was fabricated via electrochemical anodization of highly pure titanium foil and an open-ended TiO2 nanotubes array membrane was obtained by HF gas etching at the bottom of the nanotubes. Pig tubular epithelial cells (LLC-PK1) and vascular endothelial cells (ECV304) were cultivated on the open-ended TiO2 nanotubes surface through a mixing implantation method and TiO2 nanotubes biomembrane materials with physiological function were successfully produced. Hemocompatibility of glass slides, pure titanium, TiO2 nanotubes without cells and TiO2 nanotubes with culture cells were investigated by the plasma recalcification time method and reabsorption of sodium and potassium were measured by custom-designed devices. The results show that the hemocompatibility of the TiO2 nanotubes array membrane with culture cells was superior to the control group, and the biomembrane has an excellent reabsorption function. This demonstrates that a TiO2 nanotubes array membrane has excellent physiological function and is an ideal candidate material for biological dialysis.     

Preparation, characterization and photodegradation of methylene blue based on TiO2 microparticles modified with thiophene substituents

The new microparticles,2-formylthiophene(FT)/TiO2 and(E)-1,2-bis(5-formyl-2-thienyl) ethylene(EBFTE)/TiO2 were synthesized with a silane coupling agent.The prepared TiO2 composites were characterized using Ultraviolet-Vis absorption(UV-Vis),X-ray diffraction(XRD),scanning electron microscope(SEM) and thermogravimetric analyzer(TGA).Methylene blue was used as a model material to examine the photocatalytic activities of the prepared catalysts under both Ultraviolet-Vis(UV) and visible(Vis) light.The enhanced photocatalytic activities were observed in the presence of(FT)/TiO2 and EBFTE/TiO2 under Vis light.It suggests that FT or EBFTE plays a block or active role in the photodegradation mechanisms under UV and Vis light irradiation,respectively.     

制备方法对Ti0.8Zr0.2O2/沸石结构及光催化性能的影响

以酸处理后的信阳上天梯天然斜发沸石作为载体,分别采用浸渍法和溶胶凝胶法制备Ti0.8Zr0.2O2/沸石光催化剂.采用X-射线衍射、红外光谱和扫描电镜分析样品的微观结构和形貌.结果表明,80℃下,4 mol/L盐酸处理10 h后沸石结构发生了显著变化,Al—O—Si骨架结构保持.扫描电镜证明钛锆氧化物在溶胶凝胶法制备的光催化剂上高度分散,以罗丹明B(RhB)为模型污染物考察了该样品的吸附与光催化效果.300 W紫外灯光照1.5 h后,0.2 g该催化剂可使20 mL浓度为80 mg/L RhB溶液的去除率达97.12%,重复使用8次后去除率为89.47%.     

Synthesis of dental resins using diatomite and nano-sized SiO2 and TiO2

The mechanical properties of dental composites were improved by porous diatomite and nano-sized silica (OX-50) used as co-fillers.The resin composites,filled with silanized OX-50 and silanized diatomit...     

稀土元素掺杂TiO2光催化剂的改性及其性能和结构的研究

采用溶胶-凝胶法制备了稀土铽掺杂的纳米TiO2陶瓷光催化剂.研究了不同掺杂比例的铽（0.025%、0.05%、0.1%、0.15%、0.2%、0.25%、0.3%、0.35%）对二氧化钛催化活性的影响.污染水样的COD测试结果表明,掺杂铽的比例为0.15%时,TiO2的催化剂性能最好,COD去除率达90.9%.XRD结果表明铽掺杂纳米二氧化钛的主要晶型为锐钛矿.BET结果表明其催化活性与比表面积成正相关.     

TiO2/N可见光光催化降解邻苯二甲酸二甲酯

采用氮掺杂的二氧化钛为催化剂,探索了可见光催化氧化降解邻苯二甲酸二甲酯(DMP)的研究.系统地考察了光催化降解反应中DMP的初始浓度、光照时间、催化剂的量、pH值等因素对邻苯二甲酸二甲酯(DMP)的降解效率及速率的影响;同时对其光降解动力学及光降解过程中的矿化程度进行了一定的分析.结果表明,只有在催化剂和光源同时存在的情况下,DMP才有比较好的降解效果.当DMP的初始浓度为10 mg/L时,在优化条件下,即光催化剂为量1 g/L,pH值为6.20时,在以500W氙灯下进行光照8h,其降解率可达到90%以上.此光催化降解反应过程符合一级反应动力学.     

Cu-TiO2纳米复合镀层的腐蚀和光催化性能

采用纳米复合镀技术在铝表面制备了Cu-TiO2纳米复合镀层,利用扫描电镜、电化学测试系统、分光光度计对其形貌、腐蚀和光催化性能进行了研究.结果表明,TiO2纳米颗粒在铜基复合膜层中的分散均匀;TiO2颗粒的加入可使Cu-TiO2纳米复合镀层腐蚀电位明显增加,膜层的耐蚀性提高;在紫外光照射下,复合镀层对甲基橙溶液有明显的光催化降解作用,且这种作用随时间延长而有所增大.     

基于光学数据的月壤介电常数的反演

摘要：月球元素含量的反演有利于了解月球物质成分的分布从而对月球矿产资源开发利用提供重要依据,对于月球科学的研究具有重要意义。本文利用LSCC数据和Clementine光学数据在全月球的角度上对月壤中FeO和TiO_2的含量进行反演,并基于回归分析建立介电常数和FeO和TiO_2含量总和的耦合关系,进而对介电常数进行反演,并与实测点的数据进行比较,验证了利用光学数据反演月壤元素含量以及通过回归分析反演介电常数的可行性,为月表反演的研究提供了新的思路。     

复合型光催化剂H3PW12O40/TiO2/Na2Ti3O7的制备及光催化行为研究

以钛酸钠晶须为载体,采用溶胶-凝胶法制备TiO2/Na2Ti3O7,用浸渍法制得H3PW12O40修饰的复合光催化剂H3PW12O40/TiO2/Na2Ti3O7.SEM图表明产品的包覆情况良好,UV-Vis光谱显示产品的光响应增强.在自制的光化学反应器中,用一定浓度的孔雀石绿作为底物进行光催化脱色实验,通过光强度、pH值、曝气量、底物浓度、催化剂用量等对脱色率的影响,考察产品的光催化活性.实验结果表明,复合型光催化剂具有较高的光催化活性,浓度为12.5 mg·L-1孔雀石绿在250 W中压汞灯下光照60 min脱色率可达到94.23%.     

金红石(TiO2)单晶体的生长研究

通过对比晶体在不同气氛中生长与退火的结果,研究了焰熔法生长金红石单晶体的工艺条件·结果表明:炉膛气氛是决定晶体能否形成的关键因素,在合适的气氛条件下,晶体易于生长,生长速度范围较宽,可以长成较大尺寸的单晶体,否则,依赖调整(增加或降低)生长速度,不能形成完整的晶体·炉膛气氛中的氧分压大于液固界面(即生长界面)处熔体的氧离解压是生长完整晶体的前提条件;晶体在退火过程中消除热应力,但更重要的是氧化反应,消除氧空位,在氧气氛中退火,可明显缩短退火时间,并能获得呈透明状,微有浅黄色(金红石本色)的金红石单晶体·