Fundamental studies on the removal of an oily contaminant in aqueous solutions by the application of the LB technique

应用LB技术去除水溶液中油性污染物的基础研究

基本信息

批准号：
10680113
负责人：
GOTOH Keiko
金额：
$ 2.05万
依托单位：
Kyoto University of Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

A well-defined model system was constructed by the application of the Langmuir-Blodgett technique to investigate the removal processes of oily contaminants in aqueous solutions.. Silica glass plates were treated with γ -aminopropyltriethoxysilane (APTES) and methyltriethoxysilane (MTES). The wettability of the substrates decreased by the silanization. Untreated and MTES-treated silica glass were negatively charged and APTES-treated glass was positively charged in water. Arachidic acid was used as a model oily contaminant. The surface pressure-area isotherms and the Brewster angle microscopic images of the spreading monolayers of arachidic acid on water were obtained, and the solid-condensed films were transferred onto the substrates by the vertical dipping method. The substrates with the LB films were ultrasonically washed in aqueous solutions. The detergency evaluated from the change in FT-IR spectra of the substrate decreased as a result of the silanization, especially for the APTES … More treated glass. The wettability and the surface charge of the substrate played important roles in the detergency. The removal of the LB films from the APTES-treated glass increased with increasing surfactant or ethanol concentration. The removal rate was strongly dependent on temperature. The monolayers of arachidic acid were transferred onto the gold electrodes of the quartz crystal microbalance (QCM) and then the QCM was cleaned in aqueous solutions containing sodium chloride, sodium hydroxide, surfactants and/or ethanol. The detergency was evaluated from the frequency change of the QCM.The detergency had a good correlation with the free energy change due to the penetration of a thin liquid layer between the arachidic acid films and the gold surface in the zone of contact, which was calculated using the experimentally determined contact angles and surface free energies. The saponification of arachidic acid by alkali as well as the penetration was shown to contribute to the oil removal. The exposure of the 172 nm UV eximer in air and the following ultrasonic washing were effective for the removal. Less

应用Langmuir-Blodgett技术构建了一个明确的模型系统来研究水溶液中油性污染物的去除过程。用γ-氨基丙基三乙氧基硅烷（APTES）和甲基三乙氧基硅烷（MTES）处理二氧化硅玻璃板的润湿性。未处理和经 MTES 处理的石英玻璃带负电，经 APTES 处理的玻璃带正电。使用花生酸作为模型油性污染物，获得了花生酸在水中铺展的单分子层的表面压力-面积等温线和布儒斯特角显微图像，并将固体凝结膜转移到基底上。具有LB膜的基材在水溶液中进行超声清洗，由于基材的FT-IR光谱的变化而评价的去污力降低。硅烷化，特别是对于经过 APTES 处理的玻璃，基材的润湿性和表面电荷在去污力方面发挥着重要作用。随着表面活性剂或乙醇浓度的增加，LB 膜从经过 APTES 处理的玻璃上的去除也随之增加。强烈依赖于温度。将单层花生酸转移到石英晶体微天平（QCM）的金电极上，然后在含有氯化钠、钠的水溶液中清洗 QCM。去污力通过 QCM 的频率变化来评价。由于花生酸膜和金表面之间存在薄液层的渗透，去污力与自由能变化具有良好的相关性。接触区，这是使用实验确定的接触角和表面自由能计算的。碱对花生酸的皂化以及渗透被证明有助于 172 的暴露。空气中的 nm UV 准分子和随后的超声波清洗对于去除是有效的。