Ag对TiO2@Ag/聚偏氟乙烯复合薄膜性能的影响

采用光化学沉积法和溶液刮膜法制备不同Ag含量的TiO₂@Ag/聚偏氟乙烯(PVDF)复合薄膜，并采用电子万能材料试验机、紫外可见近红外分光光度计和XRD等对TiO₂@Ag/PVDF复合薄膜的物理性能和光催化性能进行表征和分析。研究发现:与TiO₂/PVDF复合薄膜相比，TiO₂@Ag/PVDF复合薄膜的拉伸强度明显提高，但断裂伸长降低，且复合薄膜的响应光谱范围拓宽至可见光区；TiO₂@Ag/PVDF复合薄膜的光催化降解能力随Ag负载量的增加而呈先升高后降低的趋势；同时TiO₂@Ag/PVDF复合薄膜具有优异的重复利用性和可见光区自清洁作用。综上所述，实验所制备的TiO₂@Ag/PVDF复合薄膜能够满足实际应用需要，因此其在光催化降解领域具有潜在的应用前景。 

Effect of Ag on properties of TiO2@Ag/polyvinylidene fluoride composite membranes

The TiO₂@Ag/polyvinylidene fluoride(PVDF) composite membranes with different Ag contents were prepared by photochemical reduction deposition and solution scraping methods. The physical properties and photocatalytic properties of the TiO₂@Ag/PVDF composite membranes were analyzed by electronic universal material testing machine, UV-visible near-infrared spectrophotometer, XRD and so on. The results show that compared with pure TiO₂/PVDF composite membranes, the tensile strength of TiO₂@Ag/PVDF composite membranes is obviously increased but the breaking elongation is decreased, and TiO₂@Ag/PVDF composite membranes can promote the response spectral range of TiO₂ to visible region. Furthermore, the photocatalytic degradation abilities of the TiO₂@Ag/PVDF composite membranes increase at first and then decrease with the increase of loaded Ag. Moreover, the TiO₂@Ag/PVDF composite membranes have excellent reusability and self-cleaning effect in visible right. Above all, the TiO₂@Ag/PVDF composite membranes prepared by the experiment can satisfy the needs of practical applications. The TiO₂@Ag/PVDF composite membranes loaded with Ag have a significant potential foreground in photocatalytic degradation field.