Monolithic silica fabricated in microchannel by adding Methyltrimethoxysilane in starting composition of the sol used for preconcentration of volatile organic compounds was investigated in this study. Fabrication of monolithic silica in microchannel is difficult because of the shrinkage of monolithic silica. By adding Methyltrimethoxysilane in starting composition, the monolithic silica was successfully fabricated in a microchannel of a microchip. The developed microchip was used for preconcentration of VOCs followed by thermal desorption and GC/MS detection. It provides a good preconcentration method for developing an on-site VOCs monitoring micro total analysis system.

MOF 衍生的多孔 ZnO/C、Ag/ZnO/C 复合材料 光催化性能研究 郭艳蓉 1 , 常 薇 1 , 张 雯 2 , 汪 辉 3 (1. 西安工程大学 环境与化学工程学院, 西安 710048; 2. 西安交通大学 理学院, 西安 710049; 3. 西安交通大学 能动学院, 西安 710049) 摘 要: 以金属有机骨架(MOF-5)为前驱体, 通过高温热处理和湿化学法获得 ZnO/C 和 Ag/ZnO/C 两种光催化复合材 料。采用 X 射线衍射(XRD)、扫描电子显微镜(SEM)、X 射线能谱(EDS)和紫外-可见分光漫反射(UV-Vis DRS)等方 法对所得样品的晶体结构、形貌特征、组成及光谱特性进行了表征。结果显示, 高温热处理保留了 MOF-5 的原始结 构。ZnO/C 比表面积为