SnO2/TiO2纳米管阵列对304不锈钢的阴极保护效果

目前,就SnO2/TiO2复合薄膜对不锈钢的光生阴极保护效果的研究有待深入。以两步阳极氧化法在钛箔表面制备TiO2纳米管阵列膜,并将其浸渍在不同浓度的SnO2溶液中,得到了SnO2/TiO2复合纳米管阵列材料。采用扫描电镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)研究了其表面形貌、晶型,用电化学方法研究了SnO2/TiO2复合纳米管阵列对304不锈钢的光生阴极保护特性及耐腐蚀性能。结果表明:TiO2纳米管排列规整,孔径约80~150 nm;以0.5 mol/L SnO2溶胶制备的SnO2/TiO2半导体供给外电路的电子数最高;在紫外光照1 h时,TiO2和SnO2/TiO2均对304不锈钢有一定的光生阴极保护作用;闭光后SnO2/TiO2光生电极在较长时间内维持较低电位,低于其在3.5%NaCl溶液中的自腐蚀电位,延时阴极保护作用可以达到8.5 h。     

C/SnO2/TiO2纳米复合物的制备及其电化学性能研究

通过碳化吸附在SnO2/TiO2电极上的葡萄糖制备出C/SnO2/TiO2纳米复合电极材料。采用晶体粉末衍射仪(XRD)、场发射扫描电镜(SEM)、X射线能谱分析(EDS)等手段对复合电极进行了表征。将复合电极作为锂离子电池负极材料,通过循环伏安和计时电位法研究了其电化学性能。结果表明,在大的电流密度200μA·cm-2下循环30次后,放电容量仍保持在120.1μAh·cm-2。相比SnO2/TiO2电极,C/SnO2/TiO2复合电极电化学性能显著提高,交流阻抗谱图也显示C/SnO2/TiO2纳米复合材料拥有更低的电荷转移电阻。     

柱状晶形貌TiO2膜厚对FTO/TiO2镀膜玻璃光催化活性影响

采用溶胶凝胶法,在FTO(SnO2:F)低辐射镀膜玻璃衬底上制备了柱状晶体结构的TiO2薄膜,获得双层结构FTO/TiO2镀膜玻璃样品.研究了TiO2薄膜厚度对FTO/TiO2镀膜玻璃样品的光催化活性、低辐射性能以及透光性能的影响.结果表明,FTO/TiO2镀膜玻璃样品光催化活性随着TiO2薄膜厚度的增加先升高后下降,在TiO2薄膜厚度为300 nm时光催化活性最佳;低辐射性能随着TiO2薄膜厚度的增加而下降,但TiO2薄膜厚度为300 nm时仍然具备一定的低辐射性能;透光性能与TiO2薄膜膜厚的关系不大,可见光透射比保持在72%左右;表面平均粗糙度约为1 nm,表面光滑,不易沾染油污灰尘.该镀膜玻璃在保证低辐射建筑节能和透光的前提下,兼具光催化自清洁功能,具有很好的应用前景.     

TiO2/SnO2纳米晶膜的制备及其电学性能研究

采用丝网印刷的方式制备了TiO2纳米晶薄膜,然后在其上采用浸泡的方式制备了SnO2纳米晶薄膜,形成TiO2/SnO2膜结构的光阳极并应用于染料敏化太阳能电池。用SEM对样品进行了结构形貌分析,用电化学工作站研究表征了SnO2的浸泡溶液浓度和浸泡时间对光阳极的调制改性作用。SEM分析表明在TiO2纳米晶薄膜表面生长的SnO2纳米晶薄膜晶粒比TiO2更加细小,电学性能研究表明TiO2薄膜经过0.4 mol/L SnO2溶液浸泡处理50 min能对TiO2薄膜的结构及性能起到很好的改善作用,电池的光电转化效率提高了约7%。     

TiO2/SnO2复合薄膜的亲水性能研究

采用溶胶-凝胶法制备了TiO2／SnO2复合薄膜，通过XRD、XPS、UV透射光谱的分析及薄膜表面接触角、光催化降解甲基橙等的分析，研究了SnO2与TiO2配比、热处理温度、膜厚度等因素对复合膜的亲水性、透光率及光催化活性的影响。结果表明：复合膜的亲水性和光催化活性均优于单纯TiO2，当SnO2与TiO2的摩尔比为1％-5％时，所制备的薄膜具有超亲水特性；热处理温度为450℃时薄膜亲水性最好，膜厚度的增加有利于亲水性的改善。     

PEO改性纳米TiO2/LDPE复合薄膜的光降解性能

以聚氧乙烯(PEO)改性纳米TiO2颗粒作为光催化剂,与低密度聚乙烯(LDPE)树脂复合制备了一种新型可光催化降解的TiO2/LDPE纳米复合薄膜,进行了该薄膜在空气中紫外光照下的光催化降解实验。通过表面接触角、失重率、红外光谱(FT-IR)和扫描电镜(SEM)等分析技术系统地研究了该复合薄膜的降解性能。结果表明,PEO的加入能提高薄膜的亲水性和TiO2的分散性,提高TiO2的光催化活性,有利于促进LDPE薄膜的降解。TiO2/PEO/LDPE复合薄膜在0.8mW/cm2紫外光强下照射425h,失重率达到15.2%;在4mW/cm2紫外光强下照射500h,失重率达到38.1%。光照后薄膜的拉伸强度和断裂伸长率显著降低,羰基指数升高。     

TiO2/SnO2复合薄膜的低温制备及其光催化性能

采用溶胶-凝胶法合成了TiO2溶胶和SnO2溶胶，使用浸渍提拉法在低温下制备出底层为金红石型SnO2，表层为锐钛矿型TiO2的复合膜．考察了不同SnO2薄膜层数对TiO2／SnO2复合膜光催化活性的影响，并对其光催化活性提高的机理进行了探讨．结果表明，SnO2层的加入能有效提高TiO2薄膜的光催化活性，随着SnO2薄膜层数的增加，光催化活性先增大后减小，但始终高于单一的TiO2薄膜．这是由于SnO2的导带电位低于TiO2的导带电位，SnO2的价带电位高于TiO2的价带电位，紫外光照下，TiO2中产生的光生电子注入到SnO2层，SnO2中空穴注入到TiO2层，有效抑制了薄膜内电子-空穴对的复合，增加了复合薄膜表面空穴的浓度，因而光催化活性得到了显著的提高．     

纳米SnO2/TiO2复合粉体制备及其红外特性研究

以溶胶-凝胶方法制备纳米SnO2/TiO2复合粉体,并用XRD、TEM等方法对其进行了表征,给出了相关的工艺参数.研究了纳米SnO2及SnO2/TiO2复合材料的红外吸收特性.结果表明,本文制备的纳米SnO2/TiO2复合材料在4000～1500cm-1和1000～400cm-1范围内有较好的红外吸收.     

热处理温度对TiO2/SiO2复合气凝胶光催化性能的影响

采用溶胶–凝胶法在常压下经不同温度热处理制备了TiO2/SiO2复合气凝胶光催化剂,利用XRD、TGA和BET等手段对其微观结构进行表征,以甲基橙溶液光催化降解实验评价其光催化性能,研究了热处理温度对TiO2/SiO2复合气凝胶的微观结构及光催化性能影响规律.结果表明:随着热处理温度升高,TiO2/SiO2复合气凝胶中锐钛矿结晶度升高,晶粒尺寸增大,比表面积减小,使TiO2/SiO2复合气凝胶对甲基橙溶液的光催化降解活性呈现先升后降的变化趋势.当热处理温度为700℃左右,紫外光照20 min TiO2/SiO2复合气凝胶对甲基橙溶液的降解率达到95.4%.     

SnO2纳米颗粒制备及其对溶胶-凝胶Sb:SnO2薄膜性能的影响

以Sn(OEt)2为起始原料,采用水热晶化法合成了分散性良好的金红石结构的SnO2纳米颗粒.采用X射线衍射对其进行了表征,表明SnO2纳米颗粒的结晶性良好,颗粒尺寸小于10nm.将合成的SnO2纳米颗粒均匀分散到SbSnO2镀膜液中,经陈化后制成镀膜溶胶,以溶胶-凝胶浸渍镀膜工艺制备纳米颗粒掺杂SbSnO2薄膜.分别采用范德堡(Van Der Pauw)法、UV/VIS分光光度计和FTIR中红外分析仪测量并分析膜层的导电性能、光学性能及结构特征,研究了导电纳米颗粒添加对SbSnO2薄膜电性能、光学性能和结构的影响.     

复合电沉积法制备Sn-TiO2纳米薄膜

采用复合电沉积法制备了TiO2质量分数为20.86%的Sn-TiO2纳米薄膜,研究了阴极电流密度、镀液温度、TiO2微粒的悬浮量等因素对薄膜中TiO2含量的影响,采用扫描电子显微镜(SEM)、X射线衍射(XRD)对热处理后的SnO2-TiO2复合薄膜进行了表征,以甲基橙为模型化合物对薄膜的光催化性能进行了测定.结果表明,在最佳工艺下所得复合纳米薄膜具有优异的光催化活性.     

离子注入改善纳米二氧化钛薄膜光催化性能

利用直流磁控反应溅射技术在玻璃衬底上制备了透明的纳米TiO2光催化薄膜。利用离子注入技术将Sn离子注入到TiO2表面以提高其光催化活性。用X射线衍射（XRD）、X射线光电子谱（XPS）以及UV－VIS分光光度计对薄膜进行结构与性能表征。Sn离子注入后的薄膜具有更高的光催化活性，这是因为在TiO2和SnO2半导体的复合体系中，电子－空穴对的分离变得更加有效，从而提高了其催化性能。     

TiO2／SnO2超微粒及其复合LB膜的紫外—可见光吸收光谱的研究

用胶体化学方法制备ＴｉＯ２／ＳｎＯ２超微粒,ＴｉＯ２／ＳｎＯ２超微粒及其复合ＬＢ膜的紫外－可见光吸收光谱研究表明：ＴｉＯ２／ＳｎＯ２超微粒具有量子尺寸效应使吸收光谱发生“蓝移”;ＴｉＯ２／ＳｎＯ２超微粒／硬脂酸复合ＬＢ膜具有良好的抗紫外性能和光学透过性能。     

新型SnO2/WO3双层薄膜NO2敏感性能研究

采用射频磁控反应溅射锡(Sn)靶和钨(W)靶的方法制备了SnO2/WO3双层薄膜材料,通过XRD和XPS实验研究了双层薄膜的物相结构和组份,结果表明,SnO2/WO3双层薄膜经过热处理后形成了SnWO4化合物.在此基础之上,制作了相应的NO2气体敏感薄膜传感器,研究了双层薄膜传感器的制备工艺参数及工作条件对传感器性能的影响,研究了传感器的敏感特性,包括灵敏度、选择性、响应恢复等特性.结果表明,传感器对NO2气体有较好的敏感性,对其他干扰气体不敏感.     

Preparation of re-usable photocatalytic filter for degradation of Malachite Green dye under UV and vis-irradiation

Sn(4+) doped and undoped nano-TiO(2) particles easily dispersed in water were synthesized without using organic solvent by hydrothermal process. Nanostructure-TiO(2) based thin films were prepared on flyswatter substrate, made with stainless steel, by dip-coating technique. The structure, surface and optical properties of the particles and thin films were characterized by element analysis and XRD, BET, SEM and UV/vis/NIR techniques. The photocatalytic performance of the films were tested for degradation of Malachite Green dye in solution under UV and vis-lights. The results showed that the coated flyswatter has a very high photocatalytic performance for the photodegradation of Malachite Green irradiated with UV and vis-lights. The results also proved that the hydrothermally synthesized nano-TiO(2) particles are fully anatase crystalline form and are easily dispersed in water, the coated surfaces are hydrophilic, and the doping of transition metal ion efficiently improved the degradation performance of TiO(2)-coated flyswatter. The photocatalytic performances determined at both irradiation conditions were very good and were almost similar to each other for Sn(4+) doped TiO(2)-coated flyswatter and it can be repeatedly used with increasing photocatalytic activity compared to undoped TiO(2)-coated flyswatter.     

CuAl2O4掺杂改性TiO2薄膜的制备与可见光催化性能研究

采用溶胶-凝胶方法在玻璃基片上制备了CuAl2O4掺杂改性的复合薄膜．研究了CuAl2O4的掺杂量、光照时间、薄膜厚度对TiO2复合薄膜光催化性能的影响，利用可见-紫外分光光度计测定酸性红B降解前后516nm处的吸光度，依此计算出薄膜对染料的降解率．借助于紫外可见光谱、X射线衍射、接触角测定仪等研究了薄膜的结构与性能．结果表明：随着CuAl2O4掺杂量的增加，TiO2复合薄膜对酸性红B水溶液的可见光降解脱色率增大．采用吸收光谱确定了CuAl2O4掺杂量为0％、0．5％、1％、1．5％％（摩尔分数）的TiO2复合薄膜的激发极限波长，分别是350、370、380、430nm，吸收边向可见区红移了20-80nm，可见光吸收范围明显扩大．     

TiO2 and SnO2 magnetic nanocomposites: influence of semiconductors and synthetic methods on photoactivity

A number of reports have been published on use of TiO2 in thin films, magnetic nanocomposites, or heterostructures such as TiO2/Ag and TiO2/SnO2, as catalysts for water decontamination. Hence, semiconductor materials such as SnO2, associated with TiO2 in such nanocomposites, should be assessed in depth for such applications, especially those involving complex structures, such as magnetic photocatalytic nanocomposites. The present study describes the synthesis, characterization and testing of the photocatalytic potential of TiO2 or SnO2 magnetic nanocomposites obtained by the polymeric precursor and the hydrolytic sol-gel methods. The nanocomposites TiO2/CoFe2O4 and SnO2/CoFe2O4 were synthesized from polymeric precursors while TiO2/Fe3O4 and SnO2/Fe3O4 were synthesized by the hydrolytic sol-gel method. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (FEG/SEM) and transmission electron microscopy (TEM). The photocatalytic potentials were evaluated by rhodamine B dye photodegradation under UV-C radiation. Compared to SnO2, the nanocomposites with a coating of TiO2 were found to show better photocatalytic activity, but the SnO2 magnetic nanocomposites showed some photocatalytic activity, even though SnO2 is reported to be inactive for these purposes. As for the synthesis method, the nanocomposites obtained from polymeric precursors had smaller surface areas, but higher photocatalytic activity, than those obtained by the hydrolytic sol-gel method. This observation was attributed to the higher crystallinity and a more active surface resulting from calcination of the polymeric precursor material.     

Photocatalytic performance of Sn-doped TiO2 nanostructured mono and double layer thin films for Malachite Green dye degradation under UV and vis-lights

Nanostructure Sn(4+)-doped TiO(2) based mono and double layer thin films, contain 50% solid ratio of TiO(2) in coating have been prepared on glass surfaces by spin-coating technique. Their photocatalytic performances were tested for degradation of Malachite Green dye in solution under UV and vis irradiation. Sn(4+)-doped nano-TiO(2) particle a doping ratio of about 5[Sn(4+)/Ti(OBu(n))(4); mol/mol%] has been synthesized by hydrotermal process at 225 degrees C. The structure, surface and optical properties of the thin films and/or the particles have been investigated by XRD, BET and UV/vis/NIR techniques. The results showed that the double layer coated glass surfaces have a very high photocatalytic performance than the other one under UV and vis lights. The results also proved that the hydrothermally synthesized nano-TiO(2) particles are fully anatase crystalline form and are easily dispersed in water. The results also reveal that the coated surfaces have hydrophilic property.     

Synthesis and photocatalytic property of SnO2/TiO2 nanotubes composites

SnO2/TiO2 nanotubes composite photocatalysts with different SnO2 contents were successfully synthesized by means of a simple solvothermal process. The synthesized products were characterized physically by X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM). The composite photocatalysts can not only make the target pollutant, methylene blue (MB), adsorbed at a high concentration level around the surface of the composites but also decrease the recombination rate of electron-hole pairs so as to achieve good photocatalytic performance. The effect of SnO2 contents on the photocatalytic activities of the composites was also investigated. The results showed that the SnO2/TiO2 nanotubes composite photocatalyst with 5 wt.% SnO2 loading had the highest photocatalytic efficiency.