煅烧工艺对TiO_2-白炭黑光催化材料性能的影响

以白炭黑和TiCl4为原料,利用低温水解沉淀方法在白炭黑载体表面负载纳米TiO2,采用煅烧工艺将白炭黑负载的纳米TiO2复合粉体进行晶化,并对煅烧后的复合粉体进行晶体结构和光催化性能的表征。结果表明,700℃煅烧2 h得到的样品,在200 W高压汞灯的照射下,35 min时对罗丹明B的脱色率达到96.23%。     

纳米TiO2-CeO2复合紫外屏蔽剂的制备和性能研究

采用溶胶凝胶法制备纳米TiO2，CeO2粉体，纳米TiO2-CeO2复合材料。并对其单一粉体和复合粉体的紫外吸收性能加以研究。分析了不同的铈钛比例和复合方式对其复合材料的颗粒形状，粒径大小以及紫外屏蔽效果的影响。研究结果表明采用溶胶凝胶法可制备粒径〈100nm的TiO2、CeO2以及TiO2．CeO2复合粉体。TiO2-CeO2复合粉体的紫外屏蔽效果优于纳米TiO2、CeO2的单一粉体．采用TiO2溶胶与CeO2溶胶混合制备的TiO2-CeO2复合粉体的紫外吸收性较好，该复合粉体中铈钛比例为1：3。     

罗丹明B敏化锐钛矿型TiO2的低温制备及性能

采用溶胶-凝胶法在低温(60～80℃)下制备得到罗丹明B染料敏化的锐钛矿型TiO2粉体.利用X射线衍射、红外光谱、荧光光谱、紫外-可见光吸收光谱、漫反射光谱对光催化剂的晶相结构、吸收光谱特征进行了表征,结果表明:罗丹明B与TiO2发生了相互作用,罗丹明B敏化的TiO2在可见光区域的吸收增强.光催化氧化实验表明,经罗丹明B敏化的锐钛矿型TiO2粉体,在普通日光灯下对甲基橙具有良好的光催化活性.     

TiO2包覆上转换发光材料Pr3+∶Y2SiO5的制备及其可见光催化性能的研究

为了提高TiO2对可见光的利用率,通过溶胶-凝胶法制备了TiO2包覆上转换发光材料Pr3+∶Y2SiO5的复合材料,并借助XRD、TEM、紫外-可见吸收光谱等对制备的样品进行了表征和研究。同时,研究了不同条件下制备的复合粉体对罗丹明B光降解效率。结果表明,该方法制备出的Pr3+∶Y2SiO5/TiO2复合材料较纯TiO2和简单机械混合两种粉体在可见光下具有较强的光催化效果。验证了Pr3+∶Y2SiO5作为上转换发光材料,可吸收可见光发射紫外线,从而满足TiO2光催化降解的要求。文中最后对Pr3+∶Y2SiO5/TiO2复合材料的光催化机理进行了研究。     

耐高温Al2O3/TiO2纳米复合粉体的制备及表征

以TiCl4、Al2(SO4)3为原料,采用液相沉淀法制备了Al2O3/TiO2纳米复合粉体,同时对该纳米复合粉体的相变过程和晶粒生长过程进行了详细的研究,对紫外-可见光吸收进行了检测.结果表明:纳米TiO2粉体经Al2O3复合后,其耐温性能得到极大提高,复合粉体经950℃煅烧后锐钛矿相含量仍然在77%,晶体粒径在20nm左右;锐钛矿向金红石晶型的转变温度在950～1100℃的高温区.复合粉体在低温煅烧后,紫外-可见吸收强度较纯纳米TiO2有较大提高,高温煅烧后,复合晶的紫外光吸收红移.     

微乳液法制备纳米二氧化钛及其光催化活性

以TiCl4为原料，在CTAB／正丁醇／环己烷／水组成的微乳液体系中合成了纳米TiO2。采用TG-DTA、XRD和TEM等分析手段对粉体的粒径、物相、形貌和热稳定性进行了表征．通过粉体对罗丹明B的降解情况对其光催化活性进行了测试。结果表明材料具有良好的光催化氧化性能。     

以PAMAM为模板ZnO-SnO2纳米复合氧化物的制备及其光催化性能

以PAMAM树枝状大分子为模板,制备了ZnO-SnO2纳米复合氧化物。利用XRD、EDS、DRS、UV-Vis等表征手段对纳米复合氧化物进行表征,并初步探讨了ZnO-SnO2纳米复合氧化物在可见光激发下降解罗丹明B的光催化性能及影响光催化剂活性的因素。结果表明所制备的ZnO-SnO2纳米复合氧化物对罗丹明B具有良好的可见光光催化降解活性。     

制备条件对纳米TiO2-石棉尾矿酸浸渣复合材料光催化性能的影响

为了提高纳米TiO2的稳定性,以TiCl4为前驱体,采用水解沉淀法在石棉尾矿酸浸渣表面负载纳米TiO2,制备纳米TiO2-石棉尾矿酸浸渣复合材料,并以罗丹明B为模拟降解物,研究水与酸浸渣质量比、反应液pH、反应时间等因素对复合材料光催化性能的影响,采用X射线衍射仪和扫描电子显微镜对复合材料进行表征。结果表明:在水与石棉尾矿酸浸渣的质量比为30∶1,pH为6,反应时间为1.5 h的优化条件下制备的复合材料,经800℃煅烧2 h后对罗丹明B的降解率为90.5%;复合材料呈现疏松多孔的松散形态,复合材料中纳米TiO2的平均晶粒度为20.9 nm。     

溶胶-凝胶法合成纳米TiO2粉体的研究进展

概述了利用溶胶-凝胶法合成纯纳米TiO2粉体时不同合成条件对制备结果的影响;综述了利用溶胶-凝胶法合成金属及非金属离子掺杂TiO2粉体、半导体复合纳米TiO2、贵金属沉积以及固体超强酸化纳米TiO2的研究现状,并指出不同方法提高光催化活性的机理在于促进电子-空穴的分离或改变能带及表面结构.针对制备纳米TiO2粉体中存在的问题,指出未来的研究方向应是提高TiO2催化活性的机理研究、可见光化纳米TiO2的制备以及工业化生产条件探索等.     

等离子喷涂Al_2O_3-30%TiO_2微米/纳米复合涂层的结构与耐磨性能

采用溶胶-凝胶法合成了不同粒径的Al2O3-30%(质量分数)TiO2纳米复合粉体,用喷雾干燥法对合成粉体进行喷雾造粒,造粒后的粉体通过等离子喷涂制备Al2O3/TiO2复合涂层,最后对涂层结构和性能进行了表征。涂层结构和形貌分析表明制备的涂层具有微米/纳米复合结构,初始粉体粒径对涂层的结构和致密度影响很小;涂层摩擦学性能测试表明复合涂层的磨损率随初始粉体粒径的增大而减小,初始粉体粒径为100nm左右时,复合涂层的磨损率最低。复合涂层的磨损机制为裂纹扩展导致的磨损剥落。     

The effect of microwave-assisted for photo-catalytic degradation of rhodamine B in aqueous nano TiO2 particles dispersions

The photo-catalytic decomposition of rhodamine B was examined in aqueous nano TiO2 particles dispersions to assess effects of the microwave radiation assisted photo-catalytic process driven by UV radiation. The results of photo-catalytic degradation of rhodamine B showed that the decomposition rate increased with the microwave intensity, UV intensity, TiO2 particle dosages and the circulating fluid velocity. Addition of oxygen gas in the photo-catalytic degradation of rhodamine B increased the reaction rate. The effect of addition of H2O2 was not significant when photo-catalysis was used without additional microwave radiation or when microwave was irradiated without the use of photo-catalysts. When H2O2 was added under simultaneous use of photo-catalysis and microwave irradiation, however, considerably higher degradation reaction rates were observed. This study demonstrates that the microwave irradiation can play a very important role in photo-catalytic degradation.     

Preparation, characterization and activity evaluation of TiN/F-TiO2 photocatalyst

In this paper, F-TiO(2) and TiN/F-TiO(2) nanoparticle photocatalysts were prepared by ball milling. The photocatalysts were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), terephthalic acid photoluminescence probing technique (TA-PL), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflection spectroscopy (DRS). The photocatalytic activity of the photocatalysts was evaluated by photocatalytic degradation of methylene blue (MB) and rhodamine B (RhB). The results showed that the photocatalytic activity of the F-TiO(2) was much higher than that of TiO(2), and the photocatalytic activity of the TiN/F-TiO(2) was much higher than that of TiO(2) and F-TiO(2) under UV light irradiation. The optimum percentage of doped TiN is 0.2 wt.%. Compared with pure TiO(2), the photoabsorption wavelength range of the TiN/F-TiO(2) and F-TiO(2) photocatalysts red shifts and improves the utilization of the total spectrum. The effect of ball milling time on the photocatalytic activity of the photocatalysts was also investigated. The optimum ball milling time is 12 h. The mechanisms of influence on the photocatalytic activity of the photocatalysts were also discussed.     

The combination of rotating disk photocatalytic reactor and TiO2 nanotube arrays for environmental pollutants removal

A combined photocatalytic system on one single TiO(2)-nanotube (TNT)/Ti photocatalyst, which was indeed the functional combination of photon-efficient thin-film and conventional bulk-phase photocatalysis processes, was effectively developed in rotating disk photocatalytic reactor for environmental purification applications. The TNT/Ti rotating disk, of uniform size and well-aligned, was successfully prepared by direct anodic oxidation on a dominantly large surface area of 38 cm(2), compared to the typical 1 cm(2) in available literature. To estimate the potentials of combined photocatalytic system for environmental applications, the degradation of rhodamine B was carried out under the optimized conditions, a substrate removal efficiency of nearly 90% and a mineralization efficiency of 56% were observed for initial 20 mg/L solution after 3 h treatment. Compared with the combined photocatalytic system on TiO(2) nanoparticle disk, a significant improvement in substrate removal efficiency of about 25-40% was observed on TNT/Ti disk. It was confirmed that the main degradation of rhodamine B occurred on the upper half of TNT/Ti disk above the heavily colorized sample solution, which was attributed to the superior UV utilization efficiency and the resultant high interfacial photoactivity.     

具有高可见光催化性能W掺杂纳米TiO_2的制备与表征

利用水热合成法成功地制备具有高活性可见光响应的W掺杂TiO2纳米粉体,采用X射线衍射、场发射扫描电镜、场发射透射电镜、可见光吸收光谱、光致发光光谱等对W掺杂TiO2纳米粉体进行表征;W掺杂TiO2纳米粉体的光催化性能通过测试其在可见光和紫外光照射下降解罗明丹B染料的催化效率来检验。结果表明,W掺杂TiO2纳米粉体在可见光照射下的光催化效率要远远大于商品P25和纯TiO2,W的最佳掺杂摩尔分数为40%。     

FeS2/TiO2复合薄膜光电性能

采用溶液浸渍法在ITO导电玻璃表面的多孔TiO2薄膜上沉积了FeS2薄膜.使用Fe2O3粉末保护裸露在外的ITO导电膜在硫气氛中热处理后,制得了FeS2/TiO2复合薄膜.应用B531/H数显测厚指示表、数字式四探针测试仪、XJCM-8太阳电池测试仪等研究了FeS2/TiO2复合薄膜的厚度、ITO导电玻璃的电阻率以及FeS2/TiO2复合薄膜的光电性能.结果表明：此方法制得的FeS2/TiO2复合薄膜具有良好的光电性能;且ITO导电膜的电阻率变化较小.因而适宜制备色素增感太阳能电池（DSSC）.     

煅烧高岭土表面TiO_2负载改性研究

以无机钛盐为前驱体,研究用水解沉淀法在煅烧高岭土表面负载纳米TiO2的改性技术,使用化学分析、扫描电镜及光催化性能测试等手段对合成材料进行表征。结果表明,所制备的TiO2-煅烧高岭土复合材料具有较强的光降解性,其对罗丹明B的降解率要明显高于某公司生产的商品TiO2。     

ZnS在TiO2纳米管上的分散对其光催化降解染料废水的影响

水热法制备了TiO2纳米管,并采用简单加热回流的方法制备了ZnS/TiO2纳米复合材料。采用TEM、XRD分析手段对产物进行表征,并对其光催化降解酸性玫瑰红B(AR)染料废水进行了研究。考察了反应物供给速率、硫化锌复合量、催化剂稳定性、光照对光催化降解效果的影响。研究表明控制反应物供给速率和硫化锌的负载量可使硫化锌在二氧化钛纳米管表面均匀分散。当染料废水初始浓度为10mg/L,ZnS:TiO2=8:1时,ZnS/TiO2复合材料光催化活性最高。且催化剂稳定性较好。     

纳米TiO_2/SiO_2复合食品抗菌材料

以水玻璃和Ti(SO4 ) 2 为原料 ,制备出了多孔的纳米TiO2 /SiO2 复合粒子。在后处理过程中 ,利用无机包覆剂溶解度随温度的变化 ,在复合粒子表面包覆了一层无机结晶膜。经热处理除去包覆剂后 ,得到了以单分散纳米复合粒子组成的复合微粉。对复合微粉进行比表面和孔容测试 ,并运用XRD和TEM进行了表征。发现TiO2 以 12 6nm的纳米晶粒的形式被多孔的SiO2 包覆 ,所形成的复合粒子则约为2 0nm。为了了解复合微粒的灭菌效果 ,运用纳米TiO2 和复合粉末对 4种保健食品进行对照灭菌实验。两个月以后 ,测得含复合微粒的样品中的菌落总数为 5 0～ 12 0个 / g ,是相应保健食品企业标准许可菌落数的 0 2 5 %～ 0 .7% ,为相应空白样和纳米TiO2 粉样品菌落数的 0 .5 2 %～ 0 .97%和33 .3%～ 83 .3 %     

A new submerged membrane photocatalysis reactor (SMPR) for fulvic acid removal using a nano-structured photocatalyst

The study focuses on the degradation of fulvic acid by nano-structured TiO2 in a submerged membrane photocatalysis reactor (SMPR). It has been demonstrated that the composite TiO2 photocatalyst could be automatically settled due to its gravity and then be easily separated by MF membrane. In addition, it was more efficient to maintain high flux of membranes than that of commercial TiO2 P25. The paper describes the effects of operational parameters on the photocatalytic degradation of fulvic acid in SMPR. It was found that the photocatalyst at 0.5 g/L and airflow at 0.06 m3/h were the optimal condition for the removal of fulvic acid (FA) and the FA degradation rate was higher at acidic condition than that at alkalinous media. In order to compare the effects of different filtration duration on permeate flux rate of MF, P25 powder and nano-structured TiO2 were employed. According to the experiments, the permeate flux rate of MF is improved and thus the membrane fouling phenomenon is reduced with the addition of nano-structured TiO2 catalyst. Therefore, the submerged membrane photocatalysis reactor can be potentially applied in photocatalytic oxidation process during drinking water treatment.     

湿化学法制备ATO/TiO2复合粉体电阻率及导电机理的研究

采用湿化学共沉淀法,在TiO2颗粒表面包覆ATO制备ATO/TiO2复合粉体.研究了复合粉体的形态结构、ATO含量对ATO/TiO2复合粉体电阻率的影响,并对导电机理进行了讨论.研究结果表明,ATO以非晶态的形态靠范德华力与静电引力吸附在TiO2表面,ATO含量决定TiO2颗粒表面能否形成完整的导电网络基本框架.渗滤阈...