光催化纳米建筑涂料降解气态氨的研究

以掺加纳米TiO2制备的光催化纳米建筑涂料为催化剂,研究了气态氨在紫外光照射下的降解,探讨了TiO2光催化剂的类型、催化剂用量、氨的初始浓度等对氨光催化降解的影响,并对氨的降解产物进行了分析,探讨了氨的光催化降解机理.结果表明,掺加锐钛型纳米TiO2的光催化纳米建筑涂料具有较高的光催化活性,其光催化活性随着纳米TiO2添加量的增加而提高,氨的光催化降解转化率随着氨初始浓度的增加而下降.氨的降解产物主要为NO3-和NO2-,涂料的光催化活性通过水洗清除催化剂表面的降解产物后可得到有效恢复.     

颜色对粉石英/纳米TiO_2涂料甲醛净化性能的影响

研究颜色对粉石英/纳米Ti O2涂料甲醛净化性能的影响。与未加颜色的对比样96%甲醛净化性能相比,有色涂料甲醛净化率都有所降低,红、橙、绿、兰、紫甲醛净化性能基本一致,为93.2%左右,降低了3%,黄色和黄绿色的甲醛净化性能降低较多,在90%左右,降低6%。黄绿色和黄色对近紫外光的吸收相对要强一些,对涂料甲醛净化率的影响要大一些;颜料点位占据涂膜表面,减少纳米Ti O2光催化的点位,会一定程度降低涂膜的光催化氧化效果。另一方面涂料的颜色越深,吸收可见光越多,涂膜温度也会略微升高,有助于提高光催化反应速度,共同作用的结果使有色涂料的甲醛净化性能有所降低。     

颜色对粉石英/纳米TiO2涂料甲醛净化性能的影响

研究颜色对粉石英/纳米TiO2涂料甲醛净化性能的影响.与未加颜色的对比样96％甲醛净化性能相比,有色涂料甲醛净化率都有所降低,红、橙、绿、兰、紫甲醛净化性能基本一致,为93.2％左右,降低了3％,黄色和黄绿色的甲醛净化性能降低较多,在90％左右,降低6％.黄绿色和黄色对近紫外光的吸收相对要强一些,对涂料甲醛净化率的影响要大一些;颜料点位占据涂膜表面,减少纳米TiO2光催化的点位,会一定程度降低涂膜的光催化氧化效果.另一方面涂料的颜色越深,吸收可见光越多,涂膜温度也会略微升高,有助于提高光催化反应速度,共同作用的结果使有色涂料的甲醛净化性能有所降低.     

纳米二氧化钛改性涂料及其甲醛降解效果研究

采用溶胶凝胶制备纳米二氧化钛粉体,利用X-射线衍射(XRD)和透射电子显微镜(TEM)对纳米二氧化钛进行表征,表明在500℃下合成的锐钛型纳米二氧化钛的颗粒分布均匀、粒径较小。利用制备的纳米二氧化钛对涂料进行改性,研究了涂料对甲醛降解性能,结果表明:在室温30℃,利用紫外灯照射180min,纳米二氧化钛改性的涂料能使甲醛降解率达到90.1%,具有良好的光催化性能。     

纳米二氧化钛的表面改性及复合氟碳涂料的制备

本文用硅烷偶联剂KH570对纳米TiO2进行表面改性,并对其工艺条件进行优化,通过红外分析、分散稳定性和显微镜照片的表征,可以看出KH570能有效改善纳米TiO2在有机介质中的分散性能,其改性的较佳条件为:改性温度60℃,改性时间45min,改性剂用量10ml。本文还将纳米粉体添加到氟碳清漆中制备纳米复合涂料,并对涂料的涂膜性能及涂膜的光催化性能进行检测,结果表明,涂膜性能均能得到大大改善,且在紫外光下具有较强的光催化活性150min内能将罗丹明B完全降解。     

掺银纳米TiO2内墙涂料的制备及性能研究

以自制的掺银纳米TiO2为功能性组分,制备纳米TiO2光催化改性涂料,并对其抗菌性、去除有机物性能及理化性能等进行了研究.实验表明,该涂料在可见光下具有优异的抗菌性、降解苯及甲醛的功能.     

掺银纳米TiO2P内墙涂料的制备及性能研究

以自制的掺银纳米TiO2为功能性组分,制备纳米TiO2光催化改性涂料,并对其抗菌性、去除有机物性能及理化性能等进行了研究。实验表明,该涂料在可见光下具有优异的抗菌性、降解苯及甲醛的功能。     

纳米TiO_2复合涂料的研制及其降解空气中甲醛的研究

用原位法合成硅丙乳液,添加纳米TiO2,进而研制成纳米TiO2复合硅丙涂料,经实验表明,该涂料具有良好的性能和较强的光催化降解室内空气中甲醛的能力,具有良好的市场前景。     

净化空气多功能内墙涂料的制备及其性质研究

加入纳米TiO2作为光催化粉体,对传统建筑内墙涂料进行改性,使之具有较强的净化空气、杀菌抑菌的功能。从分散剂用量的确定、纳米TiO2用量的确定、PVC的确定三个方面来提高涂料本身的性能。对其光催化氧化降解甲醛进行了初步测试表明,对室内有害气体污染有较大的改善作用。     

疏水涂料的研究和应用

表面疏水技术是一门广博精深和具有较高实用价值的基础技术,在人们日常生活中有着广泛的应用。通过设计不同结构、化学和物理特征的涂料,能够提供固体材料新的附加功能,特别是现代工业对疏水涂料的快速增长的需求,给功能化的疏水涂料于勃勃生机。超疏水涂层正是在此基础上发展而来的新型表面技术。疏水涂料常指涂膜在光滑表面上的静态水接触角θ大于90°的一类低表面能涂料,     

SiO_2包裹改性对TiO_2/环氧树脂涂膜防污抑菌性能的影响

采用光催化、接触角、霉菌试验以及SEM扫描电镜的测试方法,研究了不同比例SiO2掺入和包裹改性TiO2粉体添加量对TiO2防污抑菌涂膜光催化性能、与水的接触角以及抗荫性能的影响。试验表明,4％SiO2包裹改性的TiO2在环氧树脂胺固化体系中15％粉体添加量时,涂膜光催化性能最高,并表现出良好的抗菌性能,剥水的接触角下降。     

TiO2光催化涂料的制备及其对NOx气体的降解性能

以钛酸丁酯为前驱体,无水乙醇为溶剂,采用溶胶一凝胶法制备了纳米TiO<,2>粉体;结合自制有机硅树脂制备了TiO<,2>光催化涂料,并研究了其对NO<,x>气体的降解作用.结果表明,在紫外灯照射下,涂料对NO<,x>气体的降解率在5min内可达85%;在荧光灯照射下达到相同降解率所需时间较长.研究结果可为光催化涂料在环境改善方面的应用提供参考.     

纳米TiO2改性内墙乳胶漆降解甲醛的研究

主要研究了利用TiO2光催化作用对传统内墙乳胶漆改性，并进行降解甲醛实验的研究。研究结果表明，改性乳胶漆能显著提高降解甲醛的能力。     

Photodecomposition of bisphenol A on nanometer-sized TiO2 thin film and the associated biological toxicity to zebrafish (Danio rerio) during and after photocatalysis

We investigated the relationship between the TiO2 photocatalytic decomposition of bisphenol A and biological toxicity to zebrafish (Danio rerio). TiO2 particles, which prepared using a solvothermal method, were applied to produce a nanometer-sized TiO2 thin film. An alcoholic solution containing the TiO2 particles and an inorganic binder was directly coated on the UV-lamp substrate. It was equipped in a photoreactor that was manufactured in our laboratory. The attachment of the thin TiO2 film to the UV-lamp substrate resulted in a stable and transparent coating. The TiO2 particles on the thin film were approximately 20-30 nm in size, and the resulting film thickness was approximately 200 nm after a single coat. The bisphenol A, which was eluted from epoxy resin in a drinking water tank, was completely degraded by the TiO2 photocatalysis. We initially detected approximately 7.8 ng/ml of bisphenol A in the epoxy-resin tank, but its concentration was undetectable after a 48-h photocatalytic reaction over TiO2. We observed a decreased survival rate in zebrafish that were reared in water exposed to the leaching process of the epoxy resin. After the photocatalysis, however, no toxic effects on the hatching rates or morphogenesis of the zebrafish were observed. In summary, toxicity during the TiO2 photocatalysis was observed; however, toxicity was no longer observed once the bisphenol A was completely decomposed by the TiO2 photocatalysis. On the basis of these experimental observations, we suggest that TiO2 photocatalysis can be adopted as a treatment method to purify an epoxy-resin tank.     

Preliminary trial on degradation of waste activated sludge and simultaneous hydrogen production in a newly-developed solar photocatalytic reactor with AgX/TiO2-coated glass tubes

A solar fluidized tubular photocatalytic reactor (SFTPR) with simple and efficient light collector was developed to degrade waste activated sludge (WAS) and simultaneously produce hydrogen. The photocatalyst was a TiO₂ film doped by silver and silver compounds (AgX). The synthesized photocatalyst, AgX/TiO₂, exhibited higher photocatalytic activity than TiO₂ (99.5% and 30.6% of methyl orange removal, respectively). The installation of light collector could increase light intensity by 26%. For WAS treatment using the SFTPR, 69.1% of chemical oxygen demand (COD) removal and 7866.7 μmol H₂/l-sludge of hydrogen production were achieved after solar photocatalysis for 72 h. The SFTPR could be a promising photocatalysis reactor to effectively degrade WAS with simultaneous hydrogen production. The results can also provide a useful base and reference for the application of photocatalysis on WAS degradation in practice.     

环保型弹性建筑防水装饰涂料

以乙烯－醋酸乙烯为主要成膜物质,添加填料及各种助剂制成弹性建筑装饰涂料,优选4种改性剂来改善防水涂料的有关性能,介绍该涂料生产工艺、性能指标,应用状况及施工方法,研究了填料对膜延伸性,弹性,粘结强度的影响,环境温度对涂膜表干时间的影响。     

Effect of inhaled formaldehyde on learning and memory of mice

In this study, we investigated the effect of inhaled formaldehyde on learning and memory capacity. After exposure to 0 (control), 1 and 3 mg/m(3) of gaseous formaldehyde respectively, the behavior of mice in a Morris water maze, the expression of NR1, NR2B mRNA and oxidative damage levels in mice brain were analyzed. The water maze performance, the activities of dismutase superoxide (SOD) and levels of glutathione (GSH) decreased significantly in 3 mg/m(3) group (P < 0.01, compared with control group); while malondialdehyde (MDA) contents and expression of NR1 and NR2B genes increased significantly after exposure to 3 mg/m(3) of gaseous formaldehyde (P < 0.05, <0.01, <0.01, compared with control group). These findings indicate that inhaled formaldehyde negatively affects learning and memory at 3 mg/m(3) of gaseous formaldehyde but not at lower levels. Oxidative stress-induced neuron damages in the brain may be the possible mechanism for these effects. PRACTICAL IMPLICATIONS: This study indicates that inhaled formaldehyde starts to negatively affect learning and memory at a middle concentration of formaldehyde without interference of other indoor air pollutants. Oxidative damage, and the alteration of NMDA receptor expression, which were induced by formaldehyde inhalation, may be the possible mechanism for gaseous formaldehyde-induced neurotoxicity.