光催化
锐钛矿
布鲁克特
材料科学
金红石
煅烧
光降解
掺杂剂
X射线光电子能谱
化学工程
甲基橙
比表面积
核化学
无机化学
兴奋剂
催化作用
化学
有机化学
工程类
光电子学
作者
Lizeth Katherine Tinoco Navarro,Vendula Bednaříková,Jaroslav Kaštyl,Jaroslav Cihlar
出处
期刊:Gels
[MDPI AG]
日期:2023-04-24
卷期号:9 (5): 357-357
被引量:8
摘要
TiO2 aerogels doped with Ni, Co, Cu, and Fe were prepared, and their structure and photocatalytic activity during the decomposition of a model pollutant, acid orange (AO7), were studied. After calcination at 500 °C and 900 °C, the structure and composition of the doped aerogels were evaluated and analyzed. XRD analysis revealed the presence of anatase/brookite and rutile phases in the aerogels along with other oxide phases from the dopants. SEM and TEM microscopy showed the nanostructure of the aerogels, and BET analysis showed their mesoporosity and high specific surface area of 130 to 160 m2·g-1. SEM-EDS, STEM-EDS, XPS, EPR methods and FTIR analysis evaluated the presence of dopants and their chemical state. The concentration of doped metals in aerogels varied from 1 to 5 wt.%. The photocatalytic activity was evaluated using UV spectrophotometry and photodegradation of the AO7 pollutant. Ni-TiO2 and Cu-TiO2 aerogels calcined at 500 °C showed higher photoactivity coefficients (kaap) than aerogels calcined at 900 °C, which were ten times less active due to the transformation of anatase and brookite to the rutile phase and the loss of textural properties of the aerogels.
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