Departamento de Química Inorgánica, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014 Córdoba, Spain; Departamento de Química, Facultad de Química y Farmacia, Universidad Nacional Autónoma de Honduras (UNAH), Tegucigalpa, Honduras.
Departamento de Química Inorgánica, Instituto Universitario de Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, E-14014 Córdoba, Spain.
Sci Total Environ. 2020 Mar 1;706:136009. doi: 10.1016/j.scitotenv.2019.136009. Epub 2019 Dec 9.
The ZnAl-CO, ZnAlCr-CO and ZnCr-CO LDH samples were studied as De-NOx photocatalysts in this work. Samples without Cr and increasing the presence of Cr in the LDH framework in the 0.06, 0.15 and 0.3 Cr/Zn ratio were prepared by co-precipitation method, all of them constituted by pure LDH phase. The increase of chromium content in the LDH framework leads to lower crystallinity and higher specific surface area in the samples. Moreover, the CrO octahedron centres expand the photo-activity from UV to Visible light and assist to decrease the recombination rate of the electrons and holes. The favourable textural, optical and electronic properties of Cr-containing LDH samples explain the good NO removal efficiency (55%) and outstanding selectivity (90%) found for the analysed De-NOx process.
在这项工作中，研究了 ZnAl-CO、ZnAlCr-CO 和 ZnCr-CO LDH 样品作为 De-NOx 光催化剂。通过共沉淀法制备了不含 Cr 且在 LDH 骨架中增加 Cr 含量的样品，Cr/Zn 比为 0.06、0.15 和 0.3，所有样品均由纯 LDH 相组成。LDH 骨架中铬含量的增加导致样品的结晶度降低，比表面积增大。此外，CrO 八面体中心将光活性从 UV 扩展到可见光，并有助于降低电子和空穴的复合速率。含 Cr 的 LDH 样品具有良好的结构、光学和电子性能，这解释了所分析的 De-NOx 过程中良好的 NO 去除效率（55%）和出色的选择性（90%）。
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