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在1烯丙基3甲基咪唑氯室温离子液体中,将纳米TiO2粉末与纤维素浆粕进行溶液共混,所得纤维素用水再生后,经过超临界CO2干燥处理,制备了不同TiO2含量的纳米TiO2/再生纤维素复合膜。通过扫描电子显微镜(SEM)、X射线衍射(XRD)、傅立叶变换红外光谱(FTIR)对所得薄膜的形貌、结构进行表征。利用PCC-2型光催化活性检测仪测试薄膜在紫外光下光催化降解亚甲基蓝的能力,评价薄膜的光催化活性。讨论了纳米TiO2含量、超临界CO2干燥和真空干燥对薄膜性能的影响。结果表明:复合膜的光催化活性达到所用TiO2粉体的90%;经超临界CO2干燥处理所得复合膜的光催化活性明显高于真空干燥所得复合膜的活性;纳米复合膜的光催化活性随TiO2含量的增加先升高后降低,含量为5%时光催化活性最高。
In 1 allyl 3 methyl imidazolium chloride room temperature ionic liquid, the nano-TiO2 powder and cellulose pulp solution blending, the resulting cellulose regeneration with water, after supercritical CO2 drying process, the preparation of different TiO2 content of nano TiO2 / regenerated cellulose composite membrane. The morphology and structure of the obtained films were characterized by SEM, XRD and FTIR. PCC-2 photocatalytic activity detector was used to test the capability of photocatalytic degradation of methylene blue by UV light. The photocatalytic activity of the film was evaluated. The effects of nano-TiO2 content, supercritical CO2 drying and vacuum drying on the properties of the films were discussed. The results showed that the photocatalytic activity of the composite film reached 90% of that of the TiO2 powder used. The photocatalytic activity of the composite film obtained by the supercritical CO2 drying was significantly higher than that of the composite film obtained by vacuum drying. The photocatalytic activity of the composite film was The content of TiO2 increased first and then decreased, while the content of 5% showed the highest photocatalytic activity.