Department of Inorganic Technology, University of Chemistry and Technology Prague, Prague, Czech Republic.
Center of Materials and Nanotechnologies, University of Pardubice, Pardubice, Czech Republic.
Photochem Photobiol Sci. 2023 Apr;22(4):883-892. doi: 10.1007/s43630-022-00359-0. Epub 2023 Feb 6.
This work deals with the preparation of TiO nanoparticulate layers of various mass (0.05 mg/cm to 2 mg/cm) from three commercial nanopowder materials, P90, P25 and CG 300, their characterisation (profilometry, BET and SEM) and evaluation of their photocatalytic activity in the gaseous phase in a flow-through photoreactor according to the ISO standard (ISO 22197-2). Hexane was chosen as a single model pollutant and a mixture of four compounds, namely acetaldehyde, acetone, heptane and toluene was used for the evaluation of the efficiency of simultaneous removal of several pollutants. A linear dependence between the layer mass and the layer thickness for all materials was found. Up to a layer mass 0.5 mg/cm, the immobilisation P90 and P25 powder did not result in a decrease in BET surface area, whereas with an increase in layer mass to 1 mg/cm, a decrease of the BET surface was observed, being more significant in the case of P90. The photocatalytic conversion of hexane was comparable for all immobilised powders up to a layer mass of 0.5 mg/cm. For higher layer mass, the photocatalytic conversion of hexane on P25 and P90 differ; the latter achieved about 30% higher conversion. In the case of the simultaneous degradation of four compounds, acetaldehyde was degraded best, followed by acetone and toluene; the least degraded compound was heptane. The measurement of released CO revealed that 90% of degraded hexane was mineralised to CO and water while for a mixture of 4 VOCs, the level of mineralisation was 83%.
这项工作涉及从三种商业纳米粉末材料 P90、P25 和 CG300 制备不同质量（0.05mg/cm 至 2mg/cm）的 TiO2 纳米颗粒层，对其进行特性描述（轮廓仪、BET 和 SEM），并根据 ISO 标准（ISO22197-2）在流动式光反应器中评估其在气相中的光催化活性。选择正己烷作为单一模型污染物，并用四种化合物的混合物（乙醛、丙酮、正庚烷和甲苯）评估同时去除多种污染物的效率。发现所有材料的层质量与层厚度之间存在线性关系。在层质量为 0.5mg/cm 之前，固定化 P90 和 P25 粉末不会导致 BET 表面积减少，而当层质量增加到 1mg/cm 时，BET 表面积会减少，P90 的情况更为明显。在层质量为 0.5mg/cm 之前，所有固定化粉末的正己烷光催化转化率相当。对于更高的层质量，P25 和 P90 上正己烷的光催化转化率不同；后者的转化率约高 30%。在同时降解四种化合物的情况下，乙醛的降解效果最好，其次是丙酮和甲苯；最难降解的化合物是正庚烷。释放 CO 的测量表明，降解的 90%正己烷矿化为 CO 和水，而对于 4 种 VOCs 的混合物，矿化水平为 83%。
