Effect of Ag on properties of TiO2@Ag/polyvinylidene fluoride composite membranes
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摘要: 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。Abstract: 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.
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Key words:
- polyvinylidene fluoride(PVDF) /
- TiO2@Ag /
- photocatalytic /
- self-cleaning /
- composite membranes /
- degradation
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表 1 前负载Ag的TiO2@Ag/聚偏氟乙烯(PVDF)复合薄膜的具体组成
Table 1. Specific compositions of TiO2@Ag/polyvinylidene fluoride(PVDF) composite membranes with front-loaded Ag
Sample PVDF/g PVP/g TiO2@Ag/g DMAc/mL TiO2@Ag/PVDF-0.3 5.0 2.5 0.5 30 TiO2@Ag/PVDF-0.03 5.0 2.5 0.5 30 表 2 后负载Ag的TiO2@Ag/PVDF复合薄膜的制备参数
Table 2. Preparation parameters of TiO2@Ag/PVDF composite membranes with after-loaded Ag
Sample AgNO3/(mmol·L−1) Light time/min TiO2@Ag/PVDF-0.3/1 0.3 1 TiO2@Ag/PVDF-0.3/2 0.3 2 TiO2@Ag/PVDF-0.3/3 0.3 3 TiO2@Ag/PVDF-0.03/1 0.03 1 TiO2@Ag/PVDF-0.03/2 0.03 2 TiO2@Ag/PVDF-0.03/3 0.03 3 -
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