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。     

纳米TiO2光催化降解室内空气污染物的实验研究

本文介绍了纳米TiO2降解室内空气污染物的原理，理论分析纳米TiO2颗粒大小对其光催化氧化能力的影响程度。实验证实了纳米TiO2能有效地分解室内空气污染物。得出了空气流速、污染物浓度、紫外光强度与光催化氧化效果之间的变化关系。最后指出了纳米TiO2光催化技术发展应该注意的问题。     

TiO_2覆膜滤料特性参数对光催化效率影响的理论研究

以纳米TiO2覆膜滤料平板式空气净化装置为物理模型,基于质交换、扩散、吸附和光化学理论建立非稳态光催化氧化过程数学模型.应用该数学模型研究了3个光催化氧化关键特性参数对光催化氧化甲醛反应效率的影响.这些因素包括紫外光强度、吸附作用和净化风速.该研究成果对TiO2空气净化装置的设计优化具有指导意义.     

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。     

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。     

绿色环保型纳米复合杀菌涂料的研究

研究了具有杀菌功能的绿色环保型内墙涂料，比较了纳米TiO2和纳米载银抗菌材料在乳胶漆中的杀菌性能，分析了纳米材料的结构以及杀菌机理。针对纳米微粒在涂料中的分散和贮存稳定性问题，采取将纳米微粒用特殊的助剂处理，并采用合适的分散工艺，制备纳米复合涂料。研究结果表明，纳米载银抗菌材料与纳米TiO2均有较好的杀菌效果，纳米材料的浓度与杀菌效果没有线性关系，纳米栽银抗菌材料在质量分数为0.0001％就有明显的杀菌效果．且对绿脓杆菌有特效。纳米TiO2在质量分数为0.1％时对绿脓杆菌、大肠杆菌杀菌效果均最好。纳米载银抗菌材料与纳米TiO2杀菌机理不同，纳米载银抗菌材料主要通过与细菌的磷脂质起反应发挥杀菌效果，纳米TiO2主要是利用光生空穴和生成的活性氧杀菌。     

纳米TiO2改性外墙涂料的研究

采用表面活性剂、机械分散和超声波分散等工艺,将纳米TiO2分散到传统外墙涂料中,并对其性能进行了研究。结果表明,在传统涂料中添加涂料总质量0．5％的纳米TiO2,可明显提高涂料的综合性能。讨论了纳米TiO2的用量及其与乳液的适应性问题。     

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。     

纳米复合材料改性乳胶漆的抗老化性能

采用纳米TiO2和纳米ZnO分别与纳米SiO2复合,进行2种复合体系改性建筑外墙乳胶漆的抗老化性能比较．结果表明：纳米SiO2与纳米TiO2复合改性乳胶漆的抗老化性能得到明显提高,而纳米SiO2与纳米ZnO复合改性乳胶漆的抗老化性能的提高并不明显．对纳米TiO2、纳米ZnO、纳米SiO2及复合粉体的紫外—可见光吸收光谱的研究表明：纳米TiO2与纳米SiO2复合改性乳胶漆的紫外光吸收率达到93％以上,可以有效地发挥紫外吸收作用,从而提高其抗老化性能。     

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TiO2改性多功能建筑涂料的制备与性能研究

利用高速分散技术制备纳米TiO2改性多功能建筑涂料,通过对涂膜的疏水性能、耐碱（水）性能、机械性能、耐光稳定性能和对气态氨和甲醛的光催化降解等的研究表明,该涂料具有较高的光催化活性、疏水性、耐候性及良好的使用性能,在不破坏涂膜的前提下对低浓度气态污染物氨和甲醛具有较高的降解率,且降解为无害的小分子物质.     

Durability of a coating containing titanium dioxide for the photocatalytic degradation of diclofenac in water with UV‐A irradiation

A novel catalyst was used for lab scale photocatalytic experiments. It was a carbon doped titanium dioxide which was designed to create an energy efficient photocatalytic process. The titanium dioxide is able to absorb UV‐A radiation and parts of the visible light spectrum. The catalyst was immobilized to a glass sheet. UV‐A radiation was used for the degradation of the pharmaceutical diclofenac in water to investigate the applicability of the catalyst to degrade organic micropollutants. With the given experimental setup hydroxyl radicals were generated and diclofenac was degraded below the limit of quantification. However, reaction rates are rather slow and the material properties of the catalyst showed the need of improvement. This is because the properties of the coating were influenced by the release of inorganic binder. Therefore, the coating and possibly the titanium dioxide were washed off and the reaction rates decreased drastically after 80 hours of use.     

TiO2光催化降解材料性能表征与实验

随着人们生活水平的提高,汽车越来越普遍,随之而来汽车尾气也对大气造成了严重的污染。纳米二氧化钛具有较强的光降解能力,能够有效的降解大气中有害的气体。本文根据纳米二氧化钛的这一性质,研制了适合建筑物外墙使用的光催化降解材料,通过性能检测制成的材料有较强的光降解能力,能够有效的降解大气中的有害气体。     

Impact of support media in an integrated biofilter-submerged membrane system

The impact of a support material on an integrated biofilter-membrane system, simulating a difficult-to-treat surface water, was examined in terms of membrane fouling rate and water quality parameters. The support media in the membrane tanks did not generally affect any of the water quality parameters measured; however, there was an observable difference in the membrane fouling rates between the two processes with the support media system fouling at least two times slower than the non-support system. Total organic carbon (TOC) removals at around 60% were observed for two integrated biofilter-immersed membrane processes with the majority of the TOC removal occurring in the biofilters. One of the membrane tanks contained a support media (Process A) while the other did not (Process B). The feedwater contained humic acid (65% w/w) and readily biodegradable carbons (35% w/w) in the forms of acetic acid, formic acid and formaldehyde. The influent TOC values were between 3.35 and 3.94 mg/L. Acetate removals varied between 66 and 83%, while over 90% of the formate was removed and the formaldehyde was completely removed in the biofilters. There was a decrease in the UV absorbance values by over 70% for both processes.     

纳米乳液的成膜机理及纳米粉体在其中的作用研究

从纳米乳液成膜机理的研究着手,考察了玻璃化转变温度与最低成膜温度的关系,确认了纳米粒子小尺寸效应带来的成膜温度降低;通过纳米粉体分散条件的研究,找到了适宜的分散方法并保证了分散体系的稳定性;通过对纳米钛白粉和纳米硅溶胶效果的研究,确认了不同的纳米材料分别具有提高涂膜硬度、耐磨性和耐沾污性的作用。     

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.     

Comparison of photocatalysis and photolysis of malathion, isomalathion, malaoxon, and commercial malathion--products and toxicity studies

Malathion, one of the most widely applied insecticides, is still used in agriculture. There are many studies regarding its degradation under different experimental conditions, but few deal with its transformation products, i.e. malaoxon and isomalathion. Thus, malathion, malaoxon, isomalathion, and Radotion (one of its over 6000 commercial forms) were studied in terms of their degradation kinetics, identification of their transformation products, their toxicity, and their degree of mineralization, during UV photolysis (lambda = 254 nm) and TiO(2) photocatalysis (lambda = 355 nm). The degradation kinetics was similar for all four starting materials. More than 75% of theoretically expected sulfur in PS and P-S groups was oxidized after 240 min of photolysis and photocatalysis. On the other hand, less than 30% of stoichiometrically predicted amounts of phosphate was detected in the photolytic experiments, but more than 80% of expected phosphate was detected after photocatalytic treatment of all four organophosphorous materials. Several transformation products were identified by mass spectra of representative gas chromatographic peaks. Oxidation and isomerization were found as the main reactions of butenedioc acid diethyl esters and their analogs. The formation of malaoxon, isomalathion or trimethyl phosphate esters correlated well with the induced toxicity (inhibition of acetylcholinesterase), which was observed in photocatalysis of malathion and Radotion, and in photolysis of malaoxon and Radotion.     

The elimination of sulfur dioxide interference in the low level chemical oxygen demand analysis

Sulfur dioxide is a reduced compound which acts as a positive interference in the chemical oxygen demand (COD) analysis. Significant amounts of sulfur dioxide present in industrial waste samples may therefore result in erroneously high COD values, compared to that of a sample with only the organic portion of the waste. By adding 65 mg l⁻¹ Mn²⁺ to a secondary wastewater sample spiked with 500 mg l⁻¹ sulfur dioxide, and oxygenating the sample for 6 min, sulfur dioxide was oxidized completely to sulfate. This oxidation procedure provides a statistically valid means of removing SO₂ interference in the COD analysis. The procedure provides an efficient means of investigating the organic COD of industrial effluents laden with SO₂ or its dissociation products.     

高含硫气田试气作业二氧化硫监测方法探讨

针对高含硫气田试气作业排放二氧化硫的问题,利用电化学传感器建立试气监测方法。介绍了方法的原理、监测要求、设计了比对实验,结果表明：复合式气体检测仪方法监测结果能够反映试气二氧化硫扩散特征,该方法与常规人工采样监测方法监测结果的均值和标准差基本符合;两种方法监测结果的线性相关系数为0.993,使用该方法监测试气作业时大气中二氧化硫浓度能满足监测工作要求。