氢氧化钛溶胶的制备及其性质的研究

以TiCl4为起始原料,经TEA分散Ti(OH)4沉淀制得了氢氧化钛溶胶,发现溶胶在20℃左右的水中形成冻胶,在40℃以上的水中形成白色沉淀。利用紫外光谱、TEM、XRD等对溶胶体、干凝胶进行了研究,研究结果表明:此法制得的氢氧化钛溶胶的无机杂质Cl-易于除去,Ti(OH)4溶胶的凝胶化时间可控;分散体在40℃时析出的沉淀为胶质粒子,干燥物为凝胶;在75℃时析出的沉淀开始晶化;在95℃时析出的沉淀已明显晶化。

纳米氢氧化钛及焙烧产物对磷酸根的吸附特性研究

以纳米氢氧化钛(NTH)作为吸附水溶液中磷酸根的吸附剂,考察了NTH不同焙烧温度下的分子式及其对PO4吸附效果的影响。选择PO4初始浓度为50mg/L,通过正交试验确定在pH=2、吸附剂用量为0.1g、吸附时间3-3-为40min、温度25℃时,NTH吸附效果达到最佳,吸附量为55.5mg/g,经200、300、400及500℃焙烧后的NTH对磷酸根的吸附量逐渐减小;吸附量分别为49.4、40.6、25.5及16.8mg/g;NTH经800℃焙烧后,焙烧产物TiO2不具有吸附性。TG、XRD分析表明随着焙烧温度的升高,NTH的表面活性基团(-OH)数量逐渐减少。结果表明,吸附剂的吸附性与吸附剂表面羟基的数量有直接关系。

一种氧化钛的制备方法及其应用

本发明公开了一种氧化钛的制备方法及其应用。制备方法的要点是先将含钛水溶液转变成氢氧化钛，然后加入适量过氧化氢发生热反应，得到带络合基的锐钛型氧化钛溶液；所制备的锐钛型氧化钛溶液常温干燥、应用范围广，用其制成的涂布溶液有很强的接着性，不腐蚀基体材料，不污染环境，可用于制备环保涂层。

Ag_(2)O-NiTi-LDH复合材料的构建及其光催化氧化乙硫醇性能研究

本文将氧化银(Ag_(2)O)负载到镍-钛层状双金属氢氧化物(NiTi-LDH)上以构建Ag_(2)O-NiTi-LDH复合材料。通过XRD、SEM、TEM、XPS、UV-vis、电化学工作站和FT-IR等技术对样品进行表征。采用静态吸附-光催化的方法对乙硫醇进行吸附氧化降解。结果表明:复合材料中Ag_(2)O和NiTi-LDH之间存在相互作用,使得Ag_(2)O-NiTi-LDH复合材料比单一基体材料的带隙能小,光生电子-空穴的分离和迁移效率高;在光催化实验中,单一的基体材料NiTi-LDH对乙硫醇的光催化效果不明显,Ag_(2)O和Ag_(2)O-NiTi-LDH虽然都能将乙硫醇光催化氧化成硫酸盐,但Ag_(2)O-NiTi-LDH复合材料光催化氧化降解效率高于Ag_(2)O。

低功率微波法合成焦磷酸钛纳米粉体及其机理

以氢氧化钛与H3PO4为原料,采用微波法在400 W功率下辐射5 min得到焦磷酸钛纳米粉体,对合成粉体进行X射线衍射、傅里叶变换红外光谱、扫描电镜和激光粒度分析,探讨焦磷酸钛粉体的微波合成机理.结果表明,焦磷酸钛粉体具有立方体结构,存在P-O、O-P-O和P-O-P键的特征吸收峰；焦磷酸钛粉体为粒度分布较均匀,颗粒粒径为50～100 nm,外形为球状；氢氧化钛与H3PO4反应先生成中间产物Ti(HPO4)2,再进一步脱水生成焦磷酸钛粉体.

锐钛型钛白粉加入磷酸的探讨

阐述了在生产锐钛型钛白粉颜料中 ,加入磷酸的目的、用量、对钛白粉的影响 ,以及加入磷酸的方法。

PBT合成的耐水性的催化剂研究

用耐水性的化合物氢氧化钛、草酸氧钛、以及 Ti O2 纳米材料 ,分别作为聚对苯二甲酸丁二酯 ( PBT)合成的催化剂 ,与现在普遍使用的催化剂钛酸丁酯进行比较和研究 ,结果发现氢氧化钛、草酸氧钛虽有催化作用 ,但催化效果不及钛酸丁酯 ,而 Ti O2

乳制品中金黄色葡萄球菌PCR快速检测方法的建立

为快速检测乳制品中的金黄色葡萄球菌,本研究将纳米氢氧化钛和纳米氢氧化锆固定在滤纸片上以去除PCR反应抑制因子,并以Nuc为靶基因,建立一种无需样品前增菌的PCR快速检测方法,同时确定该方法的特异性、灵敏度和实用性,并评估该方法所用试剂在冷冻保存条件下的稳定性与实用性。结果表明,该PCR快速检测方法在检测97株目标菌及83株非目标菌后未出现假阳性或假阴性结果;该方法无需增菌处理,可在4 h内完成检测,检测限为10^(1)CFU·25 g^(-1)或10^(1)CFU·25 mL^(-1);该方法与传统检测方法在实际乳制品样品中金黄色葡萄球菌的检出率及活菌检测率均一致(符合率100%);此外,该检测方法所用试剂在-20℃冷冻条件下可稳定保存至少12个月。综上所述,本研究建立的PCR快速检测方法特异性强、灵敏度高,且实用性良好,能有效去除样品基质中的PCR反应抑制因子,为乳制品中金黄色葡萄球菌的快速检测提供了参考依据。

Highly efficient Z-scheme WO_(3-x) quantum dots/TiO_2 for photocatalytic hydrogen generation

Z-scheme semiconductors are a promising class of photocatalysts for hydrogen generation.In this work,Z-scheme semiconductors composed of WO3-x quantum dots supported on TiO2（WO3-xQDS/TiO2） were fabricated by solvothermal and hydrogen-reduction methods.Characterization by transmission electron microscopy and X-ray diffraction indicated that the amount and size of the WO3-x QDs could be tuned by modulating the addition of the W precursor.Evidence from X-ray photoelectron spectroscopy and photoluminescence spectroscopy suggested that the hydrogen reduction of the composite induced the formation of oxygen vacancy（W^5＋/Vo） defects in WO3.These defects led to ohmic contact between WO3-x and TiO2,which altered the charge-transfer pathway from type Ⅱ heterojunction to Z-scheme,and maintained the highly reductive and oxidative ability of TiO2 and WO3-x,respectively.Therefore,the Z-scheme sample showed 1.3-fold higher photoactivity than pure TiO2 in hydrogen generation.These results suggest that the formation of W^5＋/Vo defects at the interface is highly beneficial for the fabrication of Z-scheme photocatalysts.

Preparation, Structures Nano TiO_2 Particles, and the properties of TiH_2 Coated with Nano TiO_2

The surface of Titanium Hydride (TiH 2) is coated by Nano Titanium Dioxide (TiO 2) particles prepared in both of methods of hydrolysis reaction of Ti(OC 4H 9) 4 and base precipitation reaction of Ti(SO 4) 2. TiH 2 coated with nano TiO 2 particles, in which there is an oxidation film on its surface, shown in the experiments, will obviously achieve good effects on releasing hydrogen slowly in high temperature. There are different structures and properties of TiH 2 coated by nano TiO 2 particles prepared in different ways in high temperature, which can influence on releasing hydrogen.

施工工艺

题述钢材由（A）一种镀锌钢板或镀铝钢板；（B）膜厚为0．01～1．0μm的第一道表面处理涂层；（C）膜厚为0．1～3．0μm的第二道表面处理涂层。其中，第一道涂层由含钛化合物的水溶液组成，该溶液由≥1种钛化合物（选自一种可水解的钛化合物、可水解的钛化合物缩合物，氢氧化钛、氢氧化钛缩合物和过氧化氢）100份、

杀菌防霉涂料

含二氧化钛光解催化剂的杀菌水溶性涂料及其制备 题述涂料含分散在水溶液[含水溶性（糖）醇类]中的二氧化钛和／或氢氧化钛超细粒子。例如，一种水性涂料含10％二氧化钛和／或氢氧化钛水溶液[由5mL四氯化钛在由50％（体积分数，下同）异丙醇和50％水构成的995mL溶液中反应制备]，具有良好的杀菌性和清洁性。

Hydrogen storage properties of Mg-TiO_2 composite powder prepared by arc plasma method

Mg-based Mg-TiO2 composite powder was prepared by arc plasma evaporation of the Mg＋5%TiO2 mixture followed by passivation in air. ICP, XRD and SEM techniques were used to characterize the composition, phase components and microstructure of the composite powder. The hydrogen sorption properties of the composite powder were investigated by DSC and PCT techniques. According to the data from PCT measurements, the hydrogenation enthalpy and entropy changes of the composite powder are calculated to be-71.5 kJ/mol and-130.1 J/（K·mol）, respectively. Besides, the hydrogenation activation energy is determined to be 77.2 kJ/ mol. The results indicate that TiO2 added into Mg by arc plasma method can act as a catalyst to improve the hydrogen sorption kinetic properties of Mg.

Simultaneous hydrogen and peroxide production by photocatalytic water splitting

Photocatalytic oxidation of water is a promising method to realize large-scale H2O2 production without a hazardous and energy-intensive process. In this study, we introduce a Pt/TiO2(anatase) photocatalyst to construct a simple and environmentally friendly system to achieve simultaneous H2 and H2O2 production. Both H2 and H2O2 are high-value chemicals, and their separation is automatic. Even without the assistance of a sacrificial agent, the system can reach an efficiency of 7410 and 5096 μmol g^-1 h^–1 (first 1 h) for H2 and H2O2, respectively, which is much higher than that of a commercial Pt/TiO2(anatase) system that has a similar morphology. This exceptional activity is attributed to the more favorable two-electron oxidation of water to H2O2, compared with the four-electron oxidation of water to O2.

3D flower-like heterostructured TiO_2@Ni(OH)_2 microspheres for solar photocatalytic hydrogen production

TiO2@Ni(OH)2 core-shell microspheres were synthesized by a facile strategy to obtain a perfect 3D flower-like nanostructure with well-arranged Ni(OH)2 nanoflakes on the surfaces of TiO2 microspheres;this arrangement led to a six-fold enhancement in photocatalytic hydrogen evolution. The unique p-n type heterostructure not only promotes the separation and transfer of photogenerated charge carriers significantly, but also offers more active sites for photocatalytic hydrogen production. A photocatalytic mechanism is proposed based on the results of electrochemical measurements and X-ray photoelectron spectroscopy.

Highly dispersed Cd cluster supported on TiO_(2) as an efficient catalyst for CO_(2) hydrogenation to methanol

The conversion of CO_(2) to methanol with high activity and high selectivity remains challenging owing to the kinetic and thermodynamic limitations associated with the low chemical reactivity exhibited by CO_(2).Herein,we report a novel Cd/TiO_(2) catalyst exhibiting a methanol selectivity of 81%,a CO_(2) conversion of 15.8%,and a CH_(4) selectivity below 0.7%.A combination of experimental and computational studies revealed that the unique electronic properties exhibited by the Cd clusters supported by the TiO_(2) matrix were responsible for the high selectivity of CO_(2) hydrogenation to methanol via the HCOO*pathway at the interfacial catalytic sites.

Palladium-copper nanodot as novel H_(2)-evolution cocatalyst:Optimizing interfacial hydrogen desorption for highly efficient photocatalytic activity

Noble metal palladium(Pd)is well‐known as excellent photocatalytic cocatalyst,but its strong adsorption to hydrogen causes its limited H2‐evolution activity.In this study,the transition metal Cu was successfully introduced into the metallic Pd to weaken its hydrogen‐adsorption strength to improve its interfacial H_(2)‐evolution rate via the Pd‐Cu alloying effect.Herein,the ultrasmall Pd_(100−x)Cu_(x) alloy nanodots(2−5 nm)as a novel H_(2)‐evolution cocatalyst were integrated with the TiO_(2) through a simple NaH_(2)PO_(2)‐mediated co‐deposition route.The resulting Pd_(100−x)Cu_(x)/TiO_(2) sample shows the significantly enhanced photocatalytic H_(2)‐generation performance(269.2μmol h^(−1)),which is much higher than the bare TiO2.Based on in situ irradiated X‐ray photoelectron spectroscopy(ISI‐XPS)and density functional theory(DFT)results,the as‐formed Pd_(100−x)Cu_(x) alloy nanodots can effectively promote the separation of photo‐generated charges and weak the adsorption strength for hydrogen to optimize the process of hydrogen‐desorption process on Pd_(75)Cu_(25) alloy,thus leading to high photocatalytic H_(2)‐evolution activity.Herein,the weakened H adsorption of Pd_(75)Cu_(25) cocatalyst can be ascribed to the formation of electron‐rich Pd after the introduction of weak electronegativity Cu.The present work about optimizing electronic structure for promoting interfacial reaction activity provides a new sight for the development of the highly efficient photocatalysts.

Synthesis of core-shell nanostructured Cr2O3/C@TiO2 for photocatalytic hydrogen production

In this study,the Cr2O3/C@TiO2 composite was synthesized via the calcination of yolk–shell MIL-101@TiO2.The composite presented core–shell structure,where Cr-doped TiO2 and Cr2O3/C were the shell and core,respectively.The introduction of Cr^3+and Cr2O3/C,which were derived from the calcination of MIL-101,in the composite enhanced its visible light absorbing ability and lowered the recombination rate of the photogenerated electrons and holes.The large surface area of the Cr2O3/C@TiO2 composite provided numerous active sites for the photoreduction reaction.Consequently,the photocatalytic performance of the composite for the production of H2 was better than that of pure TiO2.Under the irradiation of a 300 W Xe arc lamp,the H2 production rate of the Cr2O3/C@TiO2 composite that was calcined at 500°C was 446μmol h−1 g−1,which was approximately four times higher than that of pristine TiO2 nanoparticles.Moreover,the composite exhibited the high H2 production rate of 25.5μmol h−1 g−1 under visible light irradiation(λ>420 nm).The high photocatalytic performance of Cr2O3/C@TiO2 could be attributed to its wide visible light photoresponse range and efficient separation of photogenerated electrons and holes.This paper offers some insights into the design of a novel efficient photocatalyst for water-splitting applications.

Kinetic Spectrophotometric Determination of Trace Titanium(Ⅳ) Based on Oxidation Discoloration of Acid Chrome Blue K with Hydrogen Peroxide

A simple and sensitive kinetic spectrophotometric method for the determination of trace amounts of titanium(IV),based upon the catalytic effect of Ti(IV) on the oxidation of acid chrome blue K (ACBK) by hydrogen peroxide in 0.002 mol/L sulfuric acid,is described. The reaction rate is monitored spectrophotometrically by measuring the decrease in absorbance of ACBK at 524 nm. The detection limit of the method is 1.01×10?9 g/mL,and the linear range is 0-0.048 mg/L. The influence of acidity,concentration of reactants,reaction time,reaction temperature and for-eign ions is also discussed. The optimum reaction conditions were established and some kinetic parameters determined. The apparent activation energy of the catalytic reaction is 5.32 kJ/mol. The relative standard deviation for the determi-nation of titanium(IV) at the concentration of 0.048 mg/L is calculated to be 1.31% (n = 11). In combination with sol-vent extraction separation,the method has been successfully applied to the determination of trace titanium(IV) in human hair,plant matter,tea and rock samples. The results are in good agreement with the certified values with the relative standard deviations (RSD) of 1.4%-3.5%.

Identifying the active sites in C-N codoped TiO_(2) electrode for electrocatalytic water oxidation to produce H_(2)O_(2)

Unveiling the active site of an electrocatalyst is fundamental for the development of efficient electrode material.For the two-electron water oxidation to produce H_(2)O_(2),competitive reactions,including four-and one-electron water oxidation and surface reconstruction derived from the high-oxidative environment co-existed,leading to great challenges to identify the real active sites on the electrode.In this work,Ti/TiO_(2)-based electrodes calcined under air,nitrogen,or urea atmospheres were selected as electrocatalysts for two-electron water oxidation.Electrochemical analyses were applied to evaluate the catalytic activity and selectivity.The morphological and current change on the electrode surface were determined by scanning electrochemical microscopy,while the chemical and valence evolutions with depth distributions were tested by XPS combined with cluster argon ion sputtering.The results demonstrated that Ti/TiO_(2) nanotube arrays served as the support,while the functional groups of carbonyl groups and pyrrolic nitrogen derived from the co-pyrolysis with urea were the active sites for the H_(2)O_(2) production.This finding provided a new horizon to design efficient catalysts for H_(2)O_(2) production.