聚乙烯醇多孔膜的制备及其对二氧化钛的负载研究

Fabrication of Porous Poly (vinyl alcohol) Film to Loading Titanium Dioxide Sol

以聚乙烯醇(PVA)为聚合物基体,戊二醛为交联剂,乙酸为催化剂,聚乙二醇6000(PEG-6000)为致孔剂,制备了聚乙烯醇多孔膜(porous PVA films,PPF多孔膜);再将实验室自制的二氧化钛溶胶(TiO_2)负载于PPF多孔膜上,制备得到聚乙烯醇原位负载二氧化钛功能薄膜(PPF-TiO_2)。采用红外光谱、扫描电镜、分光光度计等分别考察了PPF多孔膜的交联条件、负载前后PPF-TiO_2功能薄膜的形貌,PPF-TiO_2功能薄膜对甲基橙的去除率。研究结果表明,为制备适宜交联度及孔径的PPF多孔膜,戊二醛浓度为5%(wt),PEG-6000用量为PVA用量的0.6倍为宜;PPF多孔膜对TiO_2负载的温度为40℃,负载时间为2h能够获得负载量为43%的PPF-TiO_2功能薄膜。此外,PPF-TiO_2功能薄膜比商品化TiO_2对甲基橙的降解率(100mg/L)更快,且具有可循环使用的优势。

Porous poly（vinyl alcohol） （PVA） films （PPF） were prepared that PVA was used as matrix, glutaraldehyde was used as cross-linking agent, acetic acid was used as catalyst and polyethylene glycol 6000 （PEG-6000） was used as porogen, followed by loading titanium dioxide （TiO2） on it to obtain PPF loaded with TiO2（PPF-TiO2）. Infrared spectrometry, scanning electron microscope and spectrophotometer were used to investigate the cross-linking conditions, microstructure shapes before and after loading TiO2, and the degradability of PPF-TiO2 to methyl orange. The results showed that PPF with appropriate cross-linked degree and pore sizes could be fabricated with 5 % glutaraldehyde and PEG- 6000 （0.6 times of the weight of PVA）. The loading weight of PPF to TiOz reached 43% of the total weight when the loading temperature was 40℃ and loading time was controlled at 2h. Furthermore, the degradability of PPF-TiO2 to methyl orange was faster than that of TiO2 purchased.