Pt/TiO_2光催化制氢的初步研究

对无氧条件下Pt/TiO_2光催化重整甲醇制氢的基本步骤进行简化,在同一体系中进行了光催化剂的合成和光催化制氢的两步反应。基于正交设计法对该复杂体系进行了分析,得到Pt载量、甲醇/水体积、灯距、前反应时间这4种影响因素的3个不同水平对放氢速率的影响。确定了最佳实验条件为Pt载量0.5％(mol)、甲醇/水体积比5:1、灯距12 cm、前反应时间3h。分析结果表明,Pt载量对放氢速率的影响最大。实验获得的最高放氢速率为5.84 ml·h~(-1)·g~(-1)。     

溶胶一凝胶法制备钒酸铋及其光催化性能研究

采用溶胶一凝胶法制备钒酸铋颗粒光催化剂,研究银掺杂、煅烧温度、煅烧时间对BiVO4晶型组成和催化活性的影响,用X射线衍射（XRD）、透射电镜进行表征,研究了BiVO4粉体在焙烧过程中的相转变,确定了煅烧温度、煅烧时间及掺杂比例;以甲基橙（MO）的可见光催化降解反应为探针,研究了催化剂的可见光催化性能,研究发现,当煅烧时间为4h,煅烧温度为500℃时,BiV04对甲基橙光催化效率可达约20％。银掺杂的BiVO4对基橙光催化效率可达约40％。     

竹炭负载TiO_2光催化氧化DBT的研究

研究了浸渍法制备的竹炭（BC）负载TiO2光催化氧化氧化二苯并噻吩（DBT）。对其反应工艺条件（如光催化剂用量、双氧水浓度和TiO2的负载量）进行优化。结果表明负载型TiO2/BC提高了TiO2的分散度,比纯TiO2表现出更好的光催化活性。反应条件为燃料油氧化脱硫的发展提供理论参考。所得结果为：TiO2负载量15%（wt%）、H2O2的浓度O/S为14mol、催化剂用量为0.002g/mL模型硫化物。在最佳条件下反应2h,DBT脱硫率高达66%。此结果为燃料油的氧化脱硫技术的发展提供了理论参考。     

TiO2光催化处理苯胺废水影响因素的研究

用溶液浸渍法制备了TiO2催化剂，并通过实验，系统研究了光源、溶液pH值、外加氧化剂、搅拌等因素对光催化氧化反应的影响。     

Synthesis and photocatalytic properties of lanthanum doped anatase TiO<Subscript>2</Subscript> coated Fe<Subscript>3</Subscript>O<Subscript>4</Subscript> composites

A composite photocatalyst (La/TiO<,2>/Fe<,3>O<,4>) with a lanthanum doped TiO<,2> (La/TiO<,2>) shell and a magnetite core was prepared by coating photoactive LafTiO<,2> onto a magnetic Fe<,3>O<,4> core. The morphological, structural, and optical properties of as-prepared samples were charac- terized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV-vis absorption spectroscopy. The effect of lanthanum content on the photocatalytie properties was studied, and the result revealed that 0.15 mol% La/TiO<,2>/Fe<,3>O<,4>exhibited the highest photoactiv- ity. The photocatalytic properties of the prepared photocatalyst under UV and visible light were investigated in aqueous solution using methyl orange (MO) as a target pollutant. The results showed that the prepared photocatalyst was activated by visible light and used as an ef- fective catalyst in photooxidation reactions. In addition, the possibility of cyclic usage of the prepared photocatalyst was also confirmed. Moreover, La/TiO<,2> was tightly bound to Fe<,3>O<,4> and could be easily recovered from the medium by a simple magnetic process.     

Bactericidal and Photocatalytie Activity of Fe^3＋-TiO2 Thin Films Prepared by the Sol-gel Method

Pure TiO2 thin films and iron doped TiO2 thin films on glass substrate were prepared by sol-gel method, and characterized by X-ray diffractometer （XRD）, thermo-gravimetric analysis （TG-DSC）, high resolution transmission electron microscope （HRTEM）, scanning electron microscope （SEM） and UV-Vis spectroscopy, respectively. The experimental results show that the pure TiO2 thin films and iron doped TiO2 thin films can destroy most of the escherichia coli and bacillus subtillis under the irradiation of 365 nm UV-light. However, the iron doped TiO2 thin film is a better photocatalyst than pure TiO2 thin film. The ultrastructural studies provide direct evidences for understanding the bactericidal mechanism of the TiO2 photocatalyst.     

离子液体介质中氮-硼共掺杂TiO_2催化剂制备及其光催化活性

在[Bmim]PF_6离子液体介质中,用微波辐射加热方法制备了氮-硼共掺杂的纳米TiO_2-N-B光催化剂,并以甲基橙为模拟污染物,紫外灯为光源,考察了离子液体用量、氮-硼掺杂量、微波功率、微波干燥时间及微波焙烧等因素对其光催化活性的影响。结果表明,制备TiO_2-N-B催化剂的最佳条件:[Bmim]PF_6的加入量为5.6 mL,n(B)∶n(N)∶n(Ti)=4∶1.5∶1;微波炉210 W干燥18min,600℃焙烧1.5 h;或真空干燥2 h,微波辐射分三段(350 W→560 W→210 W)焙烧19 min(10.0 min→3.0 min→6.0 min)。与单一掺杂的TiO_2-B或TiO_2-N催化剂相比,氮-硼共掺杂的TiO_2-N-B催化剂催化活性明显提高,这是因为氮-硼共掺杂能够抑制TiO_2粒径的生长。     

光催化降解含酚废水研究进展

二氧化钛（TiO2）具有化学性质稳定、无毒、成本低、催化效率高等优点,以TiO2为催化剂催化氧化处理含酚废水是近年来发展迅速的一项水处理技术。就光催化剂的负载、改性以及光催化反应器的研究进展等进行了详细的阐述。     

一种新的光催化剂Bi36Fe2O57的合成及光催化

报道了一种新型光催化剂Bi36Fe2O57的一种改进的共沉淀合成方法,对不同条件下制备的产物进行了X射线衍射物相分析、扫描电镜形貌分析和光催化性能测试。物相分析表明,缓冲溶液在制备单相彤拍Bi36Fe2O57粉体中起着重要作用。紫外可见漫反射谱图表明,Bi36Fe2O57卵粉体的禁带宽度约为2．06eV,中性缓冲溶液条件下合成的Bi36Fe2O57产物结晶性好,在金卤灯下照射3h,对甲基橙的降解率可达82．7％,在紫外灯下照射2．5h降解率达到99．3％。