介孔TiO2的制备及其对漂白废水中对氯苯酚的降解研究

以钛酸四丁酯（TBOT）为前驱体，三嵌段共聚物（P123）为模板剂，用溶胶一凝胶法合成了孔径分布均匀的介孔TiO2；用小角X射线衍射（SAXRD）、X射线粉末衍射（XRD）、透射电子显微镜（TEM）和红外光谱（FT-IR）等分析手段对产物结构和光学性能进行了表征。结果表明：TiO2为介孔结构，在低于400℃煅烧时介孔结构稳定性高，孔径均匀分布，晶型全部为锐钛矿。光催化降解对氯苯酚表明介孔TiO2具有优异的催化性能，在250W紫外灯照射2h后，氯化有机物中的苯环特征峰完全消失，降解率可达95．3％。     

纳米TiO2的制备、醋酸改性及催化性能研究

在硬脂酸介质中，450－900℃温度下，得到不同结构的纳米TiO2；将纳米TiO2进行醋酸处理。用X射线衍射（XRD）和透射电子显微镜（TEM）对纳米TiO2的微结构进行表征，发现，在相同温度下，经醋酸改性的纳米TiO2具有较好的均匀和分散性。纳米TiO2成功用于马来酸酐聚合反应，用红外（ＩＲ）和核磁共振（ＮＭＲ）研究了相关单体和聚合物的结构。此外，对醋酸改性纳米TiO2进行了光催化降解甲基橙研究。     

TiO2/活性炭复合体超临界沉淀法制备及其光催化性能

以活性炭为载体、超临界二氧化碳为流体、钛酸丁酯为前驱体,用超临界流体沉积法制备TiO2/活性炭（TiO2/AC）复合体。用X射线衍射（XRD）、扫描电镜（SEM）、比表面积分析（BET）、热重-差热（TG-DTA）对TiO2/AC进行表征。以紫外灯为光源,偶氮类染料亚甲基蓝为标准降解物,考察TiO2/AC复合体的光催化...     

微波辐射溶胶-凝胶法制备TiO2薄膜及其降解铬黑T的活性

通过微波辐射溶胶一凝胶法（sol-gel）法在导电玻璃（ITO）基体上制备TiO2纳米薄膜光催化剂，考察不同加热方式、微波时间、酸处理、薄膜层数等对TiO2纳米粒子及薄膜的影响。以可见光谱（UV-VIS）、X射线衍射（XRD）对TiO2薄膜进行了表征，并通过薄膜光催化降解铬黑T溶液的性能进行了研究。实验表明，ITO玻璃表面的TiO2纳米薄膜经HNO3和微波处理后，因协同效应使薄膜的光催化活性大大增强。     

锐钛矿二氧化钛纳米线的水热制备及其表征

利用水热法制备了锐钛矿TiO2纳米线，用X射线衍射仪（XRD）、扫描电子显微镜（SEM）和原子力显微镜（AFM）对TiO2纳米线的形貌、成份进行了分析表征。在进行AFM观测时，采用一种简单易行的方法将TiO2纳米线固定在ITO玻璃衬底表面，解决了AFM扫描过程中样品不能稳定吸附在衬底上的问题。经过适当改进，该方法同样适用于其他粉末状纳米材料的原子力显微镜和扫描隧道显微镜（STM）研究。     

原位掺杂Al/Si纳米TiO2粉体的制备及其光催化性能

纳米二氧化钛是一种重要的无机功能材料.以化学沉淀法制备了纳米TiO2以及Al/Si原位掺杂纳米TiO2粉体,利用透射电镜（TEM）、差热式扫描量热仪（DSC）、X射线衍射仪（XRD）以及X光电子能谱仪（XPS）对粉体粒子的形貌、大小、物相和组成进行了分析.采用浸渍提拉法制成均匀致密的膜,以光催化降解亚甲基蓝溶液为模型反应,研究了无机掺杂元素对其光催化性能的影响.研究结果表明,Al/Si掺杂TiO2的分散性得到了提高,并增强了其光催化活性.     

采用不同碳源制备碳掺杂TiO_2可见光催化剂

分别采用不同的碳源制备得到碳掺杂TiO2,并采用X射线衍射、扫描电镜、紫外-可见吸收光谱和BET液氮吸附对碳掺杂TiO2的物相、粒径、吸收波长阀值和比表面积进行了表征。以苯酚溶液为催化降解对象,测定了不同碳源掺杂TiO2的可见光催化活性。结果表明:相对于以蔗糖为碳源制备碳掺杂TiO2,使用酚醛树脂能有效的阻止TiO2纳米材料在煅烧过程中的团聚,其制备得到的C-TiO2粒径小,比表面积大,吸收光波长红移较为明显,并在可见光存在条件下,3h能降解超过90%的苯酚,高于商品化的催化剂P25。     

溶剂对介孔二氧化钛结构及光催化活性的影响

在室温下采用不同溶剂直接合成出介孔TiO2，分别用场发射透射电镜（HRTEM）、透射电镜（TEM），X射线粉末衍射（XRD）和BET比表面测定等技术对TiO2进行了表征。结果表明：在该实验条件下能获得高比表面的介孔TiO2，溶剂的极性对孔结构有一定的影响，同时对甲基橙的光催化降解活性有较大的影响。     

TiO_2/HZSM-5的制备及光催化性能的表征

以钛酸四丁酯为钛源,采用溶胶-凝胶法在HZSM-5分子筛表面合成TiO2前驱体,程序升温处理制得TiO2/HZSM-5负载型光催化剂。采用X射线衍射、扫描电镜、傅里叶变换红外光谱、X射线光电子能谱对光催化剂晶相结构、表面形貌及化学组成进行了表征。结果表明,HZSM-5可提高TiO2分散性能,降低TiO2晶粒的尺寸。TiO2/HZSM-5中的Ti都以TiO2形式存在,没有Ti—O—Si键生成。甲基橙溶液的光催化降解结果表明,负载后提高了TiO2对甲基橙溶液的光催化降解活性。TiO2的质量分数为30%,400℃下煅烧2h时的催化剂光催化性能最好。     

Zn2+/TiO2中空纤维纳米材料模板辅助的两步法制备及其光催化性能

利用一种模板辅助的两步法制备了一系列Zn2+掺杂的TiO2中空纤维纳米材料(Zn2+/TiO2);利用扫描电子显微镜(SEM)、X射线衍射(XRD)、X光电子能谱(XPS)和紫外-可见光谱(UV-Vis)等技术进行表征;以亚甲基蓝(MB)的降解为模型反应,考察Zn2+量对TiO2中空纤维纳米材料光催化性能的影响。结果表明:制备的样品为复制了模板形貌的中空结构纳米纤维材料;在0.00～0.62%Zn2+量范围内,Zn2+/TiO2的光催化活性明显高于TiO2的,且随掺杂量呈先增后降的变化趋势,当Zn2+量在0.29%左右时,其光催化活性最高,在太阳光下3h,MB溶液在Zn2+/TiO2表面的脱色降解率达98%以上,而在TiO2表面仅为60%;Zn2+/TiO2在重复使用5次时仍能保持MB溶液脱色率在90%以上。样品Zn2+/TiO2所表现出的优良催化性能是众多因素-表面羟基、吸附氧、Zn2+活性位、特殊的纤维形貌等协同作用的结果。     

Ag-CNT/TiO_2复合电极对亚甲基蓝的光电催化降解作用(英文)

采用金属银修饰的碳纳米管制备了Ag-CNT/TiO2复合电极。利用X-射线衍射(XRD),扫描电子显微镜(SEM),透射电子显微镜(TEM),和能量分散性X射线分析(EDX)对所制的Ag-CNT/TiO2复合材料进行了表征。结果表明:二氧化钛颗粒和金属银颗粒在碳纳米管上均匀分布,所制电极具有较高的光电催化性能。其对亚甲基蓝的光电催化降解归因于一种协同效应,即二氧化钛的光降解、碳纳米管网络的电子辅助、金属银的增强和外加电势的作用。尤其是,经银修饰的复合电极增强了其对亚甲基蓝的光电降解,且随银含量的增加其光电催化效果增加。     

TiO2-N-S光催化剂的制备、表征及性能研究

以胱氨酸为掺杂剂,利用溶胶-凝胶法直接制备了N、S共掺杂改性的光催化剂TiO2-N-S,借助XRD、XPS和SPS等手段对其进行了表征,并以苯酚为模型污染物考察了其在模拟太阳光下的催化活性.XRD分析表明该光催化剂为锐钛矿晶型,N、S共掺杂能有效抑制TiO2晶粒的生长,提高了晶相间转变温度.XPS显示S是以S6+形式存...     

ZnS/TiO2聚砜纤维复合材料的制备及其光催化水制氢性能的研究

利用高压静电纺丝制备了具有良好耐光降解性能的羧基聚砜电纺纤维毡,利用其为载体用水热反应法制备了ZnS/TiO2聚砜复合光催化材料,得到了分布均匀的ZnS/TiO2聚砜纤维复合材料。通过X射线衍射、光电子能谱、紫外-可见漫反射光谱、热失重、耐紫外光降解实验对复合材料进行了表征。光催化分解水制氢实验表明:ZnS/TiO2含羧基聚砜纤维复合材料的催化效率高于同等条件下粉体ZnS/TiO2,并且具有很好的重复稳定性。     

Physical and biocompatibility studies of novel titanium dioxide doped phosphate-based glasses for bone tissue engineering applications

This study investigated doping titanium dioxide (TiO(2)) into phosphate glasses, 50 P(2)O(5)-30 CaO-20 Na(2)O, to control their degradation rate and enhance their biological response to be suitable scaffolds for bone tissue engineering applications. The thermal and structural properties were analysed using differential thermal analysis and X-ray powder diffraction. The effect of TiO(2) incorporation on degradation rate, ion release, and pH changes was also carried out. In vitro cyto-biocompatibility was assessed through MG63 human osteosarcoma cells attachment and viability using scanning electron microscopy and confocal microscopy, respectively. The results showed that addition of TiO(2) produced a significant increase in density and glass transition temperature. X-ray diffraction analysis showed the presence of NaCa(PO(3))(3) as a main phase of these glasses with titanium phosphate Ti-P(2)O(7) only detected for 5 mol% TiO(2) glasses. The degradation rate, however, was significantly reduced by one order of magnitude with incorporation of 5 mol% TiO(2) which has been reflected in released ions (cations and anions) and the minimal pH changes. Moreover, addition of TiO(2), 3 and 5 mol% in particular, supported the MG63 cells attachment and maintained high cell viability up to 7 days culture comparable to Thermanox. These results suggested that TiO(2) containing phosphate glasses can be a promising substrate for bone tissue engineering applications.     

Construction of hierarchical nanostructured TiO2/Bi2MoO6 heterojunction for improved visible light photocatalysis

In this study, Bi2MoO6 hollow microspheres were modified by depositing TiO2 nanoparticles through a simple hydrothermal method. The prepared TiO2/Bi2MoO6 photocatalysts were characterized by scanning and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and UV-vis diffuse reflectance spectroscopy. The photocatalytic performance of the heterostructured catalysts was evaluated by degradation of methylene blue (MB) under visible-light irradiation (lambda>420 nm). The photocatalysts based on nanostructured Bi2MoO6 and TiO2 exhibit much higher photocatalytic activity than the single-phase Bi2MoO6 or TiO2 and the mechanical mixture of Bi2MoO6 and TiO2 for degradation of MB under the same conditions. The results reported in this study provide insight into constructing other heterostructured photocatalysts.     

Preparation and photoelectrocatalytic activity of ZnO nanorods embedded in highly ordered TiO(2) nanotube arrays electrode for azo dye degradation

In this article, the ZnO nanorods embedded in highly ordered TiO(2) nanotube arrays (ZnO/TiO(2) NR/Ts) electrodes were fabricated through two steps: (1) electrosynthesis of TiO(2) nanotube arrays (TiO(2) NTs) in HF solution by anodization method; (2) followed by cathodic electrodeposition of ZnO embedded in the TiO(2) nanotube arrays. The morphological characteristics and structures of ZnO/TiO(2) NR/Ts electrodes were examined by field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD) analysis, and UV-vis spectra. The linear-sweep photovoltammetry response on the ZnO/TiO(2) NR/Ts electrode was presented and the photocurrent was dramatically enhanced on the ZnO/TiO(2) NR/Ts electrode, comparing with that on bare TiO(2) NTs electrode. The photocatalytic and photoelectrocatalytic activity of ZnO/TiO(2) NR/Ts electrode was evaluated in degradation of methyl orange (MO) in aqueous solution.     

Degradation of 4-chlorophenol in TiO2, WO3, SnO2, TiO2/WO3 and TiO2/SnO2 systems

The present study was undertaken to evaluate the degradation performance of 4-chlorophenol (4-CP) using TiO2/WO3 and TiO2/SnO2 systems. A BET surface area analyzer, UV-vis spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron spectroscopy for chemical analysis (ESCA) were employed to characterize the photocatalyst. The band edge wavelength increased to 475 nm and gap energy decreased to 2.61 eV in the TiO2/WO3 system as compare to the single TiO2. Although the specific surfaces area of TiO2/WO3 decreases due to its larger size as compared to either TiO2 or WO3, the 4-CP degradation efficiency significantly increased as compared to single TiO2 or WO3 system at 435 nm wavelength. The TiO2/WO3 degradation of 4-CP at 369 nm was in fact inhibited. For TiO2/SnO2, the degradation efficiency also suffered at 369 nm, and only slightly increased compared to otherwise hardly 4-CP degraded in single TiO2 or SnO2 system. Since there is a significant accumulation of byproducts, the buildup of these intermediates on the catalyst surface may be responsible for their poor performance.     

TiO2-Cu2O复合膜的制备及其可见光催化降解染料性能研究

采用电化学方法制备了TiO2-Cu2O纳米复合材料,并用喷涂法在玻璃表面制成TiO2-Cu2O复合膜.通过X射线衍射(XRD)、扫描电镜(SEM)等手段对TiO2-Cu2O复合材料进行了表征,用正交设计法研究了TiO2-Cu2O复合膜与Fe2 EDTA构成的Fenton试剂在可见光照射下催化降解亚甲基兰的性能,并用实验证实了H2O2存在.结果显示,TiO2-Cu2O复合膜光催化降解性能明显优于TiO2膜和Cu2O膜.与传统Fenton试剂相比,TiO2-Cu2O复合膜与Fe2 EDTA构成的Fenton试剂体系有效作用时间更长,并可重复使用.     

CNT/TiO2复合材料的合成、表征及其光催化性能分析

采用多壁碳纳米管(MWCNTs)为原料,分别以异丙醇钛(TIP)、丙氧基钛(TPP)和四丁氧基钛(TNB)为钛源,苯作为溶刺,制备了CNT/TiO2复合材料.利刖N2吸附等温线,扫描电子显微镜(SEM),X-射线衍射(XRD),能量分散性X-射线分析(EDX)以及紫外吸收光谱对所制CNT/TiO2复合材料进行了表征.并在紫外光照射下,通过亚甲蓝(MB,C16H18N3S·Cl·3H2O)水溶液的转,变测试了CNT/TiO2复合材料的光催化性能.研究结果表明:CNT/TiO2复合材料对MB的降解作用不仅有MWCNT的吸附性和TiO2的光催化性,而且还有MWCNT和TiO2之间的电子转移性.