Modelling the kinetics of stearic acid destruction on TiO2 'self-cleaning' photocatalytic films
Modelling the kinetics of stearic acid destruction on TiO2 'self-cleaning' photocatalytic films
复制标题
DOI：
10.1016/j.apcata.2022.118899
复制
发表时间：
2022-10-14
影响因子：
5.5
通讯作者：
Mills, Andrew
中科院分区：
文献类型：
--
作者：
Alofi, Saleh;O'Rourke, Christopher;Mills, Andrew
硬脂酸，SA，去除光催化膜的动力学建模使用对数正态分布的表面反应性，这表明，作为分布的反应性，ρ，增加，所以也没有反应的表观顺序，m，所观察到的SA浓度的变化，[SA]，与照射时间，t。该模型用于拟合三种截然不同的TiO 2薄膜（即ActivTM自清洁玻璃、制备的溶胶-凝胶TiO 2和P25 TiO 2薄膜）所观察到的[SA]与t曲线。这些膜显示衰减动力学，与m = 0.3，0.44和0.6，分别适合模型预测的衰减分布宽度，ρ，值，分别为0.4，0.54和0.7。在这些膜上使用Ag光催化剂指示剂油墨以突出在微米尺度上的表面反应性的不均匀分布。使用的对数正态模型，以更好地了解所表现出的光催化薄膜的动力学进行了简要讨论。
The kinetics of stearic acid, SA, removal by photocatalytic films are modelled using a log-normal distribution in surface reactivity, which shows that as the distribution in reactivity, rho, increases, so too does the apparent order of reaction, m, of the observed variation in SA concentration, [SA], versus irradiation time, t. The model is used to fit the observed [SA] vs. t profiles exhibited by three very different TiO2 films, namely ActivTM self-cleaning glass, and prepared sol-gel TiO2 and P25 TiO2 films. These films show decay kinetics, with m = 0.3, 0.44 and 0.6, respectively, which fit the model predicted decay profiles with distribution width, rho, values, 0.4, 0.54 and 0.7, respectively. A Ag photocatalyst indicator ink is used on these films to highlight the non-uniform distribution in surface reactivity on the micron scale. The use of the log-normal model to better understand the kinetics exhibited by photocatalytic films is discussed briefly.