β-环糊精聚合物/二氧化钛有机-无机杂化材料的制备及其光催化性能的研究

Study on Preparation and Photocatalytic Properties of β-Cyclodextrin Polymer/Titanium Dioxide Inorganic-organic Hybrid Materials

通过烯丙基--βCD与丙烯酸(AA)的共聚合反应在环糊精聚合物链中引入活性基团羧基,运用溶胶-凝胶法制备了新型的环糊精聚合物P(CD-co-AA)/TiO2有机-无机杂化材料.通过FT-IR表明杂化材料中有机无机两相间存在着化学键;SEM证明有机无机两相高度相容;TGA证明热稳定性能有大大的提高.通过光催化降解甲基橙实验证实杂化材料P(CD-co-AA)/TiO2的光催化效率是TiO2的2.6倍.考查了催化剂用量、甲基橙溶液的初始浓度和初始pH值对材料光催化性能的影响.实验证明当溶液的初始浓度为4 mg/L和初始pH=2及催化剂用量为0.8 g/L时,杂化材料表现出更为优良的光催化性能.

A novel hybrid material P（CD-co-AA）/TiO2 was prepared by sol-gel process, and in order to introduce the chemical bond between the organic polymer chain and inorganic network of the hybrid, the carboxyl functional group was introduced into copolymer P（CD-co-AA） side chain by copolymerization between allyl-β-CD and acrylic acid （AA）.The results of FTIR SEM and TGA show that the chemical hond is formed between the TiO2 phases and the polymer matrix of the hybrid and the organic and inorganic components were well dispersed homogeneously with each other, the hybrid materials acquired more excellent thermal stability. The photoactivity of P（CD-co-AA）/TiO2 was studied by means of the organic dye methyl orange. The photoactivity of P（CD-co-AA）/TiO2 and TiO2 were studied using the organic dye methyl orange. The photodegradation percentage of the hybrid materials is 2.6 times higher than that of TiO2 colloid. The influence of catalyst amount and concentration and pH value of the dye on the photoactivity were discussed, optimization photocatalytic activity of P（CD-co-AA）/TiO2 were obtained, the amount of P（CD-co-AA）/TiO2 is 0.8 g/L and the initial concentration and pH value of methyl orange are 4 mg/L and 2, respectively.