Photocatalytic degradating methyl orange in water phase by UV-irradiated CdS carried by carbon nanotubes

A new candidate for photocatalytic degradating organic dyes,CdS carried by car-bon nanotubes(CdS/CNTs) ,is reported. The degradation ratio curves of methyl orange in water phase show that the capability for degradating organic molecules of CdS/CNTs is obviously higher than that of separated CdS. The degradation ca-pability enhances as the increase of the amount of net CdS catalyst,the ratio of carbon nanotubes to CdS,and the area of the template,and is influenced by the pH value and the temperature of aqueous solution. These results suggest that the photocatalyst of CdS/CNTs is very suitable for potential applications in organic waste removal from water.     

气-固相光催化反应器及其在空气净化中的应用研究进展

介绍了光催化氧化过程的基本原理 ,特别是其中涉及到的表面与界面现象等问题。在此基础上对目前研究中应用较多的几类气 固相光催化反应器的特性及相关问题进行了评述 ,展望了光催化氧化过程在挥发性有机化合物 (VOCs)除去及空气净化方面的应用前景。     

Degradation of crystal violet using nanometer TiO2 under the synergistic action of H2O2 and ultrasonic wave

TiO2 nanoparticles with different phases are prepared by hydrolysis of titanium tetrabutoxide in the presence of HCl. The composition and microstructure of the resulting samples are studied by XRD and TEM. These results show that the range of particle size of TiO2 is from 20 to 30 nm. The mechanism of TiO2 photocatalysis reaction has been discuss edextensively. Photocatalyfic activities of nanometer TiO2 are also evaluated by degradation of the crystal violet solution. Experimental results indicate that the synergistic action of H2O2 and ultrasonic wave greatly enhances photo-catalytic reaction of TiO2.     

载银微弧氧化TiO2膜光催化杀菌研究

以磷酸钠为电解液,采用微弧氧化技术在钛网上直接制备TiO2膜,利用硝酸银光沉积法对该膜表面进行修饰,考察TiO2膜光催化杀灭空气中细菌的能力.利用XRD,SEM,EDX对微弧氧化膜晶型、表面形貌和成分进行观察分析.研究结果表明：微弧氧化TiO2膜主要由锐钛矿TiO2组成,随电解时间增长,锐钛矿TiO2增多,TiO2膜光催化杀菌效果明显好于单独紫外光的杀菌效果;光沉积银修饰可以改变微弧氧化TiO2膜的表面成分,改善膜的光催化性能.光沉积银微弧氧化TiO2膜和微弧氧化TiO2膜以及单独紫外光30 min的杀菌效率分别为95.2%,68.5%和36.1%.     

1,3-二羟基萘的合成与应用

综述了1,3-二羟基萘的合成与应用。合成路线包括以3-羟基-1-萘磺酸钠,4-羟基-2-磺酸钠,1,3-茶二磺酸为原料的碱熔法;纳米二氧化钛水性悬浮液中萘的光催化直接氧化二羟基化制备法;由γ苯基乙酰乙酸乙酯或苯基乙酰氯在硫酸中环合制备三种合成方法。从工艺简便性和环保角度出发,应着重研究和开发光催化羟基化法。有26篇参考文献。     

水热合成Cu-Bi2WO6催化剂及用于光催化氧化脱硫的研究

采用水热法合成了可见光催化剂Cu-Bi2WO6,并对其进行X射线粉末衍射(XRD)、紫外-可见漫反射(UV-Vis DRS)表征。以噻吩的正辛烷溶液作为模型化合物,以催化剂的pH值、用量、光照时间、空气流率等工艺条件为考察对象,研究了Cu-Bi2WO6光催化氧化脱除模型化合物中含硫化合物的性能。结果表明,Cu的复合使Bi2WO6的可见光吸收带发生红移,吸收强度也有较大幅度的提高。在中性条件下制备的催化剂活性最高,在空气通入量为300mL/min,催化剂加入量为0.5mg/L时,400W金卤灯照射180min,Cu-Bi2WO6光催化氧化脱硫效果较好,脱硫率可达到97%以上。     

Photocatalytic reduction of carbon dioxide over ferrocyanide-coated titanium dioxide powder

Photocatalytic reduction of carbon dioxide in aqueous media has been carried out over potassium-ferrocyanide-coated titanium dioxide powder. Formic acid and formaldehyde were identified as photoproducts, and were measured spectrophotometrically using Nash reagent. The effect of the variation of different parameters such as potassium ferrocyanide concentration, amount of photocatalyst (potassium-ferrocyanide-coated titanium dioxide powder), light intensity and particle size on the yield of photoproducts was also investigated. A tentative mechanism for this reduction has been proposed. © 1997 John Wiley & Sons, Ltd.     

FeCl3-Catalyzed C(sp3)−H Heteroarylation Enabled by Photoinduced Ligand-to-Metal Charge Transfer

Herein, we report a strategy for pyrimidination of inert alkanes via synergistic visible light-driven redox reaction and FeCl₃ catalysis. This transformation involves C−H activation by a chlorine radical generated during the iron-promoted ligand-to-metal charge transfer process, triggering subsequent C−H pyrimidination. The substrates and catalysts are inexpensive and readily available, while the reaction conditions and procedures are simple without the need for external oxidants. This work provides a practical approach for synthesizing pyrimidine derivatives with high structural diversity.     

(BiO)2CO3纳米线真空热解产物表征及光电性能研究

通过水热法合成了(BiO)₂CO₃纳米线,并在真空条件下对其进行了不同条件的热处理,通过X射线衍射、扫描电子显微镜对其进行了物相、成分和形貌表征,并采用紫外可见光漫反射光谱、瞬态光电流分析对原始(BiO)₂CO₃纳米线及真空条件下的热解产物进行了性能研究。结果表明,真空条件下,次碳酸铋热分解产生Bi₂O₃,并进一步释放晶格氧形成非整比化合物Bi₂O_2.7和Bi₂O_2.3,两种非整比铋化合物的形成导致次碳酸铋纤维的光电流强度降低。     

PVDF/TiO2杂化纤维膜的制备及其性能分析

采用静电纺丝的方法制备聚偏氟乙烯（PVDF）/二氧化钛（TiO2）杂化纤维膜,并利用扫描电子显微镜、X射线衍射仪和可见分光光度计等仪器对杂化纤维膜的微观形貌、晶体结构、力学性能以及光催化性能进行研究与分析。结果表明,随着TiO2添加量的增加,PVDF/TiO2杂化纤维膜表面暴露的TiO2增加;杂化纤维膜的拉伸强度呈现先增后减的趋势;且杂化纤维膜的光催化降解能力逐渐增强;同时PVDF/TiO2杂化纤维膜具有良好的重复利用性。