高分散Pt-TiO2/C催化剂对甲醇的电催化氧化

采用TiO2溶胶法,在三种不同条件下制备了碳载Pt-TiO2(Pt-TiO2/C)催化剂。通过XRD衍射,循环伏安法(CV),线性扫描法(LSV)和计时电流法(CA)对Pt-TiO2/C催化剂的结构及其对甲醇的电氧化特性进行了研究。结果表明不同条件制备的催化剂中,TiO2的结晶度不同,Pt的粒径不同,对甲醇的电催化氧化的活性也不同。其中加入聚乙二醇形成的TiO2溶胶以甲酸为还原剂,在乙二醇体系中制备的Pt-TiO2/C催化剂中Pt的粒径小,分布均匀,对甲醇的氧化具有较高的电催化活性。甲醇在该催化剂上的氧化电流密度分别是采用硝酸或醋酸方法的1.08倍和1.43倍。     

用光催化剂TiO2/WO3处理含Cr6+废水

采用复相光催化剂TiO2／WO3对含重铬酸钾的废水进行处理。探讨了光催化剂的配比、试液的起始浓度、光催化剂的用量、试液的pH值、光照时间与重铬酸钾溶液还原率的关系。实验结果表明：催化剂配比m(TiO2)：m(WO3)=6：1,试液起始浓度为125mg／L,催化剂用量为0．200g,pH=4．4,光照6h,重铬酸钾溶液的还原率可达98．5％。该方法具有操作工艺简单、节省能源、所需设备少、处理彻底、氧化能力强、无二次污染等优点。     

TiO2光催化处理饮用水的研究进展

目前．饮用水安全已随着工业化的进程严重受到威胁。TiO2先催化作为一项新兴的水处理技术,在饮用水处理上同样受到重视。它能够有效避免Cl2、O3、ClO2等消毒剂所产生的副产物(三氯甲烷,NOM等),同时还有较强的灭茵能力,而且能够去除细菌死亡过程中释放出来的毒素。这使得二氧化钛在处理饮用水问题上具有明显的优势。因此．TiO2先催化技术必将得到广泛的应用。     

乙二醇在碳载Pt-TiO2催化剂上的电催化氧化

采用TiO2溶胶法,在不同条件下制备了碳载Pt-TiO2(Pt-TiO2/C)催化剂.运用循环伏安法和计时电流法来检测乙二醇在催化剂上的电催化氧化情况.结果发现方法c制备的Pt-TiO2/C催化剂对乙二醇在酸性溶液中的电氧化具有最佳的催化活性和稳定性.     

3D printed titanium scaffolds with ordered TiO2 nanotubular surface and mesoporous bioactive glass for bone repair

Titanium alloy scaffolds have recently gained substantial interest for the treatment of critical-size bone defect, particularly along with the maturity of the 3D printing technology that is capable of turning scaffold design ideas into real implants. As titanium alloys lack surface osteogenic activity, for improved biological performance of such scaffolds, surface modification is necessary. Various coating materials and coating methods have been explored. In this study, we developed a unique surface modification method to provide the surface of 3D printed titanium scaffolds with nano-sized structure and bioactive agent. Uniform, ordered TiO₂ nanotube arrays were formed by applying two-step anodization, and then mesoporous bioactive glass (MBG) was loaded into nanotubes. The results of in vitro immersion testing showed that bioactive ions, i.e., Si and Ca ions, could be steadily and continuously released from MBG into basal medium. The assessment of the responses of hBMSCs confirmed that the surface-modified scaffolds supported the adhesion and proliferation of hBMSCs, indicating good surface cytocompatibility. The developed method of combining surface nanostructure and bioactive agent could be used as a new strategy to improve the osteogenic activity of 3D printed titanium alloy scaffolds.     

5′-硝基-水杨基荧光酮-Triton X-100荧光熄灭法测定钢中钛的含量

本文选用新合成的荧光试剂5'-硝基-水杨基荧光酮,在Triton-X-100存在下与Ti(Ⅳ)形成三元配合物,使试剂荧光熄灭而建立了一种测定钢铁中微量钛的荧光分析新方法.方法的灵敏度高,测钛的线性范围为0～15μg/25ml,用该法测定了几种标准钢样中钛的含量,结果比较满意.     

含钡低钛高炉渣硫分配系数的研究

就ＢａＯ质量含量１．０％－３．７％，ＴｉＯ２质量含量１．５％－４．０％，炉渣二元碱度（ＣａＯ／ＳｉＯ２）０．９５－１．１５的高炉渣脱硫能力进行了研究。结果表明：在实验条件下，炉渣脱硫反应是二级反应；炉渣硫分配系数Ｌｓ随二元碱度提高而提高；渣中ＴｉＯ２为３％时，Ｌｓ有一峰值。     

Carboxyl-modified hierarchical wrinkled mesoporous silica supported TiO2 nanocomposite particles with excellent photocatalytic performances

Titanium dioxide (TiO₂) is a common photocatalyst for organic pollutants degradation. However, in practical application, the poor adsorption capacity of pure TiO₂ seriously impeded its efficiency in the degradation of organic molecules. In this work, a series of hierarchical wrinkle mesoporous silica supported TiO₂ nano-composite particles (TiO₂ @WMS-COOH) were successfully prepared. Thanks to their high surface areas, large pore volumes and mesoporous structures, these materials showed high adsorption capacity and excellent photocatalytic performance towards dye molecules, which is comparable to or even better than commercial catalyst P25. Moreover, their photocatalytic efficiency can be further enhanced by increasing the calcination temperature during preparation process. Therefore it can be concluded that the TiO₂ @WMS-COOH particles may find promising applications in the photodegradation of organic pollutants.