Analysis of Cu-Ce/TiO₂ photocatalytic-moisture performance based on orthogonal design and multivariate nonlinear regression

With Cu(NO₃)₂ · 3H₂O and Ce(NO₃)₃ · 6H₂O as the modifier, Cu-Ce/TiO₂ was made by sol-gel method. Cu-Ce doped loading, Cu-Ce molar ratio and sintering temperature were analyzed by orthogonal design and multivariate nonlinear regression, in order to get significant of Cu-Ce/TiO₂ moisture performance and photocatalytic performance. The preparation parameters of optimal Cu-Ce/TiO₂ were obtained, performance and characterization of optimal Cu-Ce/TiO₂ were studied and analyzed by SEM, LPSA, XRD and UV-Vis. The results showed that various factors on importance order of Cu-Ce/TiO₂ moisture performance and photocatalytic performance:Cu-Ce doped loading > Cu-Ce molar ratio > sintering temperature > blank. Preparation parameters of optimal Cu-Ce/TiO₂:Cu-Ce doped loading is 3.26%, Cu-Ce molar ratio is 0.87:1, sintering temperature is 505℃. Cu-Ce/TiO₂ moisture performance and photocatalytic performance are 0.0869 g · g^-1 and 50.7%, respectively. Cu-Ce/TiO₂ morphology is better, particle size distribution is 1 183.68-3 916.05 nm, and absorption sideband occurs red shift.