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以钛酸正丁酯为前驱物,采用溶胶-凝胶低温水热方法,以离子液体(1-乙基-3-甲基咪唑醋酸盐)和水为混合溶剂,制备了锐钛矿相的纳米二氧化钛。产物经XRD,TEM,N2吸附-脱附等表征,结果表明与纯水相比,混和溶剂中制备的二氧化钛具有较高的纯度,结晶度和热稳定性,且缩短反应时间到24h,所得颗粒尺寸10nm与在纯水中反应48h所得颗粒尺寸7nm相当,说明离子液体的存在可促进锐钛矿相二氧化钛的结晶和生长。另外,该产物表面积可达238m·2g-1。本文还进一步研究了该产物对甲基橙水溶液的光降解作用,结果表明,用此方法制备的TiO2对甲基橙降解作用优于商业P25二氧化钛。
Using n-butyl titanate as precursors, a sol-gel low temperature hydrothermal method and an ionic liquid (1-ethyl-3-methylimidazolium acetate) and water as solvent mixtures were used to prepare anatase phase Of nano-titanium dioxide. The product was characterized by XRD, TEM, N2 adsorption-desorption and so on. The results showed that compared with pure water, the titanium dioxide prepared in the mixed solvent has high purity, crystallinity and thermal stability, shortens the reaction time to 24h, The size of 10nm and pure water in the reaction of 48h obtained particle size of 7nm equivalent, indicating the presence of ionic liquids can promote the anatase phase of titanium dioxide crystallization and growth. In addition, the product surface area up to 238m · 2g-1. The photodegradation of methyl orange aqueous solution by this product is further studied. The results show that the degradation of methyl orange by this method is superior to that of commercial P25 titania.