共查询到19条相似文献,搜索用时 359 毫秒
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采用溶胶-凝胶/旋转涂覆法在玻璃基板表面制备介孔SiO2/Bi2 O3/TiO2分层薄膜.采用XRD、UV-vis及表面接触角测量仪对薄膜的结构、透光性及超亲水性进行分析.结果表明,介孔SiO2/Bi2 O3/TiO2分层薄膜仍然保持了表面SiO2的介孔结构,在无光照条件下仍具有超亲水性.涂有硬脂酸的薄膜在紫外光照射后恢复了其超亲水性,具有良好的自洁净性能.且SiO2/Bi2 O3/TiO2分层薄膜表现出比单独的SiO2/TiO2和SiO2/Bi2O3分层薄膜更高的光催化活性. 相似文献
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自清洁表面是目前解决清洁问题的最有效、最方便、最经济的方法之一。本文主要研究了超亲水性的自清洁表面的制备,以两性离子聚合物的合成,以化学法和物理法修饰在玻璃基材表面,从而增强玻璃基材的亲水性。修饰后的玻璃基材表面进行亲水性、防雾性、透光性等性能进行检测。结果表明,以化学法和物理法修饰的玻璃基材表面的亲水性、防雾性、耐久性都与在紫外光催化的TiO_2薄膜的性能类似,透光性稍有一些不足。 相似文献
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多晶二氧化钛表面浸润性转变的机械化学处理方法 总被引:2,自引:1,他引:2
TiO2薄膜具有光致超亲水性,在黑暗中放置一段时间后转变为疏水性.本文报道了一种可以在几分钟内实现多晶锐钛矿薄膜表面的亲水性向疏水性转变的机械化学方法. 相似文献
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考察了溶胶-凝胶法制备TiO2/SiO2复合薄膜过程中,正硅酸乙酯(TEOS)的水解时间与膜的超亲水性的关系,通过XRD分析了SiO2添加量对TiO2锐钛矿晶型的影响,并研究复合薄膜的表面处理对其亲水性的影响。实验发现,当无因次反应时间为0.4时,复合薄膜的亲水性最好;SiO2的引入能够抑制金红石晶型的生长,最佳含量在10~20%。 相似文献
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采用溶胶-凝胶/旋转涂覆法在玻璃基板表面制备含钛介孔SiO2薄膜.利用XRD、UV-Vis以及接触角测量仪对薄膜的孔结构和超亲水性进行表征.结果表明,当Ti/Si物质的量比为0~0.05时,薄膜均具有良好的介孔结构;而随着Ti/Si物质的量比的增加,薄膜的介孔有序度下降.即使在无光照条件下,含钛介孔SiO2薄膜也表现出高效的超亲水性.涂有油酸的薄膜在紫外光照射后恢复其超亲水性,且薄膜对甲基橙具有良好的光催化降解效果,表明制备的含钛介孔SiO2薄膜具有良好的自洁净性能. 相似文献
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《Ceramics International》2020,46(17):27080-27091
The micro-patterning of NiFe2O4 (NFO) films was achieved by a photolithography-assisted chemical solution deposition technique without photoresists. Subsequently, the micro-patterned NFO films were combined with Fe3+-doping TiO2 (FTO) films and then novel micro-patterned NFO/FTO composite films were prepared. The structures, morphologies, hydrophilicity, and optical and visible-light photocatalytic performance of the micro-patterned NFO/FTO films were investigated. The results revealed that the micro-patterned NFO/FTO films exhibit the entire visible-light absorption, lower recombination of electrons and holes and improved hydrophilicity, resulting in higher visible-light photocatalytic activity for methylene blue degradation as compared to pure NFO and FTO films. In addition, the hydrophilicity and photocatalytic activity of the micro-patterned NFO/FTO films are strongly dependent on their pattern periods. More interestingly, the recyclability of the micro-patterned NFO/FTO film can be easily realized without the assistance of external magnet, and the catalytic activity does not decrease with cycle numbers. 相似文献
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以钛酸丁酯为钛的前驱体,硝酸银为银物种掺杂给体,采用溶胶-凝胶法制备经Ag掺杂改性的TiO2溶胶,利用浸渍提拉法在普通玻璃片上制得了Ag-TiO2薄膜,以甲基橙溶液为模拟污染物,研究了煅烧温度、掺银量对Ag-TiO2薄膜光催化活性的影响。结果表明,随煅烧温度的升高,TiO2的结晶度提高,复合薄膜表面的TiO2颗粒形貌逐渐变为规则形状,当煅烧温度为500℃时,复合薄膜具有较好的光催化活性。随着掺银量的增加,复合膜的光催化活性先增大后减小,当AgNO3质量分数0.5%时,复合薄膜具有较好的光催化活性。 相似文献
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以钛酸丁酯为前驱体,醋酸铅为铅物种掺杂给体,采用溶胶-凝胶法制备经铅掺杂改性的二氧化钛溶胶,利用浸渍提拉法在普通玻璃片上制备铅-二氧化钛薄膜,利用X射线衍射(XRD)及扫描电镜(SEM)测试手段对制备的样品进行表征,考察煅烧温度、掺铅量等影响因素。以甲基橙溶液为模拟污染物,30 W紫外灯为光源,考察了铅-二氧化钛薄膜的光催化活性。研究结果表明,掺杂适量的铅离子可以促进二氧化钛锐钛矿相含量的增加及晶粒尺寸的减小;随着煅烧温度的升高,铅-二氧化钛的结晶度提高,复合薄膜表面的二氧化钛颗粒形貌逐渐变为规则形状。当煅烧温度为600 ℃、铅质量分数为0.3%时,复合薄膜具有较好的光催化活性。 相似文献
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以钛酸四丁酯为前驱体,冰醋酸为水解抑制剂,采用溶胶-凝胶法制备纳米TiO2/CNTs复合催化剂。测定复合催化剂对不同浓度茜素红溶液的光降解活性,并对光催化降解动力学进行研究。结果表明,在CNTs负载质量分数7.5%、焙烧温度450 ℃和焙烧时间3.5 h条件下制备的TiO2/CNTs复合催化剂光催化活性得到提升。相同条件下,TiO2/CNTs对150 mg·L-1茜素红溶液的最终降解率达67%,而TiO2的最终降解率只有56%。复合催化剂光催化活性提升的原因是CNTs负载后光催化粒子在紫外光照射下生成更多的氢氧根活性自由基。光催化降解动力学符合Langmuir-Hinshelwood方程,催化剂对污染物的表观吸附是整个反应的“瓶颈”。随着反应浓度的增大,光催化降解反应的反应级数由一级反应逐渐下降为零级反应。 相似文献
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Shun-Huei Wang Ta-Kun Chen K. Koteswara Rao Ming-Show Wong 《Applied catalysis. B, Environmental》2007,76(3-4):328-334
Carbon-doped or carbon-covered titania can enhance photocatalytic performance under visible light. Here we report the first instance of synergistic effect of the carbon incorporation in anatase titania (TiO2−xCx:C) films with both substitutional doping and surface covered characteristics, by reactively co-sputtering Ti metal and graphite targets. The nature of incorporated carbon is characterized by Raman spectroscopy, X-ray photoelectron spectroscopy and transmission electron microscopy. The absorption edge of the carbon incorporated titania thin films shifted from ultraviolet to visible region and directly depended on the carbon content. The photocatalytic performance, e.g., photodegradation of methylene blue (MB), photo-reduction of silver-ions and super hydrophilicity, was greatly enhanced with increasing carbon content. The best photocatalytic activity is obtained in the TiO2−xCx:C film of the most carbon concentration about 9.3 at.% with a degradation rate-constant of 0.108 h−1 for MB under visible-light illumination. 相似文献
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D. Zare-Hossein-abadi A. Ershad-Langroudi A. Rahimi S. Afsar 《Journal of Inorganic and Organometallic Polymers and Materials》2010,20(2):250-257
Transparent nanocrystalline TiO2 thin films with high photocatalytic activity and photo-induced wettability were successfully deposited on a glass slide.
Crystal phase transformations and particle size of TiO2 were investigated. Structural and morphological properties of the films were investigated. The photocatalytic activity of
the TiO2 films was evaluated. It is found that the photocatalytic activity of TiO2 thin films is significantly decreased by increasing the annealing temperature, which results in a decrease in BET surface
area and an increase in crystal size. In addition, increasing film thickness within a certain range significantly improves
the photocatalytic activity without causing crack formation of the TiO2 films. Photocatalytic oxidation and photo-induced wettability conversion on the films were investigated. It is found that
photo-induced hydrophilic conversion is observed even on the samples annealed at high temperature. The best photo-generated
activities are obtained by optimization of dip-coating cycles and annealing temperatures. 相似文献
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C. Euvananont C. Junin K. Inpor P. Limthongkul C. Thanachayanont 《Ceramics International》2008,34(4):1067-1071
TiO2 films deposited by various coating techniques were investigated for self-cleaning applications. The optical coating layers of TiO2 films prepared from a sol–gel precursor were deposited on glass substrates using spin coating, dip coating and screen printing techniques. Effects of film deposition techniques on crystal structure, microstructure, thickness, photocatalytic activity, hydrophilicity and optical properties of the films were investigated using XRD, AFM, SEM, surface profilometer, UV–vis spectrophotometer and contact angle measurement. Dip coating the TiO2 optical film two and three times resulted in superhydrophilic surfaces. Increasing number of dipping times was found to increase the photocatalytic activity. 相似文献