The hydrothermal stability of TiO₂-ZrO₂ nanofiltration (NF) membranes fired at 200, 400, and 550 °C was examined at 90 °C for 4–100 h, followed by an evaluation of the NF performance at 25 °C. After hot-water treatment, the water permeability (L_p) of a membrane fired at 200 °C had slightly increased, while that of membranes fired at 400 and 550 °C had drastically decreased. Meanwhile, the values for molecular weight cut-off (MWCO) were decreased for all membranes. The L_p and MWCO changed during the initial 20 h and remained constant for as long as 100 h, confirming the stability in an aqueous solution at 90 °C. The permeation properties of water and neutral solutes were evaluated for temperatures that ranged from 25 to 85 °C. The water permeability and permeate flux increased with an increase in temperature, while the rejection of solutes decreased. Based on analysis using the Spiegler-Kedem equations, the reflection coefficient was constant irrespective of permeation temperature, while both water and solute permeability were increased with an increase in the permeation temperature, which revealed that the permeation mechanism of water and neutral solutes is an activated process. In addition, the activation energies of solute permeability were found to be higher than those of water permeability.

在200、400和550°C下煅烧的TiO ₂ -ZrO ₂纳滤（NF）膜的水热稳定性在90°C下检查4-100 h，然后评估25°C下的NF性能。经过热水处理后，在200°C烧制的膜的透水性（L _p）略有增加，而在400和550°C烧制的膜的透水性则大大降低。同时，所有膜的分子量截留值（MWCO）均降低。在大号_pMWCO在最初的20小时内发生变化，并在100小时内保持恒定，从而证实了在90°C的水溶液中的稳定性。在25至85°C的温度范围内评估了水和中性溶质的渗透性能。随着温度的升高，水的渗透率和渗透通量增加，而溶质的截留率降低。根据使用Spiegler-Kedem方程进行的分析，无论渗透温度如何，反射系数都是恒定的，而水和溶质的渗透率都随渗透温度的升高而增加，这表明水和中性溶质的渗透机理是被激活的。过程。另外，发现溶质渗透性的活化能高于水渗透性的活化能。