Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal.
Institute of Chemistry, Department of Analytical Chemistry, University of Campinas, P.O. Box 6154, Campinas, SP, 13083-970, Brazil.
Environ Sci Pollut Res Int. 2018 Oct;25(28):27796-27807. doi: 10.1007/s11356-018-2008-0. Epub 2018 Apr 26.
In the present work, a facile method to prepare translucent anatase thin films on cellulose acetate monolithic (CAM) structures was developed. A simple sol-gel method was applied to synthesize photoactive TiO anatase nanoparticles using tetra-n-butyl titanium as precursor. The immobilization of the photocatalyst on CAM structures was performed by a simple dip-coating method. The translucent anatase thin films allow the UV light penetration through the CAM internal walls. The photocatalytic activity was tested on the degradation of n-decane (model volatile organic compound-VOC) in gas phase, using a tubular lab-scale (irradiated by simulated solar light) and pilot-scale (irradiated by natural solar light or UVA light) reactors packed with TiO-CAM structures, both equipped with compound parabolic collectors (CPCs). The efficiency of the photocatalytic oxidation (PCO) process in the degradation of n-decane molecules was studied at different operating conditions at lab-scale, such as catalytic bed size (40-160 cm), TiO film thickness (0.435-0.869 μm), feed flow rate (75-300 cm min), n-decane feed concentration (44-194 ppm), humidity (3 and 40%), oxygen concentration (0 and 21%), and incident UV irradiance (18.9, 29.1, and 38.4 W m). The decontamination of a bioaerosol stream was also evaluated by the PCO process, using Pseudomonas aeruginosa (Gram-negative) and Staphylococcus aureus (Gram-positive) as model bacteria. A pilot-scale unit was operated day and night, using natural sunlight and artificial UV light, to show its performance in the mineralization of n-decane air streams under real outdoor conditions. Graphical abstract Normally graphics abstract are not presented with captions/legend. The diagram is a collection of images that resume the work.
在本工作中，开发了一种在醋酸纤维素整体式（CAM）结构上制备半透明锐钛矿薄膜的简便方法。采用简单的溶胶-凝胶法，以四丁基钛为前驱体制备光活性 TiO2 锐钛矿纳米粒子。通过简单的浸涂法将光催化剂固定在 CAM 结构上。半透明锐钛矿薄膜允许 UV 光穿透 CAM 内壁。使用装有 TiO2-CAM 结构的管式实验室规模（模拟太阳光照射）和中试规模（自然光或 UVA 光照射）反应器，研究了在气相中降解正癸烷（模型挥发性有机化合物-VOC）的光催化活性，两种反应器均装有复合抛物面聚光器（CPC）。在实验室规模下，研究了不同操作条件下正癸烷分子光催化氧化（PCO）过程的效率，如催化床尺寸（40-160 cm）、TiO2 薄膜厚度（0.435-0.869 μm）、进料流速（75-300 cm min）、正癸烷进料浓度（44-194 ppm）、湿度（3%和 40%）、氧气浓度（0%和 21%）和入射紫外辐照度（18.9、29.1 和 38.4 W m）。还通过 PCO 过程评估了生物气溶胶流的净化效果，使用铜绿假单胞菌（革兰氏阴性）和金黄色葡萄球菌（革兰氏阳性）作为模型细菌。中试规模装置在白天和黑夜运行，使用自然光和人工紫外线，以展示其在真实户外条件下正癸烷空气流矿化的性能。
