一种线型结构钛酸钠微晶水热制备及其性能的研究

采用水热法制备了一种线型结构钛酸钠晶体,其直径为50 ～ 200 nm,长度为几微米到几十微米.利用XRD、SEM和UV-vis等测试手段表征了材料的晶化、结构、形貌及光学性能.研究结果表明:水热反应时间和温度对线型结构钛酸钠微晶的形成具有显著的影响；其最佳的反应条件:反应温度为180℃和反应时间为24h.并初步探讨了钛酸钠线型微晶的生长机理.650℃高温烧结处理得到的线型结构TiO2微晶,具有较高的紫外光光催化活性:0.5 g/L浓度TiO2线型微晶,对初始浓度为20 mg/L甲基橙溶液1h光催化降率可达80;以上.

Synthesis and Properties of Wire-like Sodium Titanate Microcrystallines by Hydrothermal Method

The wire-like sodium titanate microcrystallines with the diameters of 50-200 nm and length of a few micrometers to tens of micrometers were prepared by hydrothermal method.The crystallization,structure,morphology and optical property of the as-prepared samples were characterized by XRD,SEM and UV-vis spectrometer.The research results indicated that the hydrothermal reaction temperature and time have great effect on the formation of wire-like sodium titanate microrystallines,and the optimal reaction conditions were achieved as following: the reaction temperature is 180 ℃ and the reaction time is 24 h.The growth mechanism of wire-like sodium titanate microrystallines is proposed.The wire-like TiO2 microrystallines obtained with the annealing heat treatment at 650 ℃ exhibit the highest photocatalytic reactivity under UV radiation: the degradation of ratio can be up to 80% during the photodegradation of methyl orange with the initial concentration of 20 mg/L for 1 h.