Department of Natural Resources, Isfahan University of Technology, Isfahan, Iran.
Environ Sci Pollut Res Int. 2023 Mar;30(12):32524-32538. doi: 10.1007/s11356-022-24498-0. Epub 2022 Dec 5.
The efficiency of a novel synthetic zeolite (Ze) prepared from stone cutting sludge and a natural zeolite (clinoptilolite, Cp) as the support of TiO photocatalyst was examined for the CO removal under solar irradiation using a designed parabolic trough collector (PTC). The used samples were characterized using XRF, BET, SEM/EDS, and XPS analyses. The enhanced sunlight irradiation obtained by PTC increased the performance of CO photocatalytic removal. The maximum CO adsorption by TiO-Ze and TiO-Cp composites was 21.1% and 28.4% which increased to 61.8% and 78.9% under sunlight irradiation, respectively. The efficiency of zeolite-TiO composites for CO removal was approximately two times higher than zeolites and TiO alone. The performance of TiO-Ze-coated composite with lower use of photocatalyst for CO adsorption and photocatalytic removal was better than that of powder one. Regeneration of TiO-Ze using NaOH solution improved its removal efficiency. The adsorption behavior of CO on TiO-Ze composite was well described by the Langmuir isotherm and the pseudo-first-order kinetic model. This work promises CO reduction using natural and synthetic zeolite as an efficient photocatalyst support under solar irradiation.
一种新型合成沸石（Ze）由石材切割污泥和天然沸石（斜发沸石，Cp）制备而成，用作 TiO2 光催化剂的载体，用于在太阳照射下使用设计的抛物线槽式集热器（PTC）去除 CO。使用的样品采用 XRF、BET、SEM/EDS 和 XPS 分析进行了表征。PTC 获得的增强阳光照射提高了 CO 光催化去除的性能。TiO2-Ze 和 TiO2-Cp 复合材料的最大 CO 吸附量分别为 21.1%和 28.4%，在阳光照射下分别增加到 61.8%和 78.9%。沸石-TiO 复合材料去除 CO 的效率大约是沸石和 TiO2 单独使用的两倍。对于 CO 吸附和光催化去除，使用较少光催化剂的 TiO2-Ze 涂层复合材料的性能优于粉末状复合材料。使用 NaOH 溶液再生 TiO2-Ze 提高了其去除效率。CO 在 TiO2-Ze 复合材料上的吸附行为很好地符合 Langmuir 等温线和准一级动力学模型。这项工作有望在太阳照射下使用天然和合成沸石作为高效光催化剂载体来减少 CO。
