过氧钛酸水系溶胶的制备及溶胶性质和形成机理研究
Study on Preparation, Properties and Forming Mechanism of the Peroxo Titanic Acid Sol
以无机盐TiOSO4、氨水为原料，H2O2为络合剂通过沉淀、胶溶制备了水系过氧钛酸(PTA)溶胶，通过粘度、 电位测量及X射线衍射（XRD）、热失重（TG-DTA）和傅立叶变换红外光谱（FT-IR）等测试手段对溶胶的性质和化学结构进行了表征。结果表明：PTA水系溶胶状态呈黄色、透明，溶胶pH值保持在6～7左右，稳定性良好； 电位为负值说明溶胶由带负电荷的胶粒组成；XRD衍射结果显示PTA溶胶在200℃出现明显的锐钛矿晶相衍射峰，800℃热处理时出现了较尖锐金红石相衍射峰，与锐钛矿并存；FT-IR谱图表明PTA溶胶中有过氧键（O-O）的存在，溶胶由钛的过氧络合物组成。根据无机化学原理并结合实验结果对PTA溶胶形成的反应机理进行了初步探讨，认为溶胶是由带负电荷的Ti2O5(OH)x2-x(x=3－6)及其过氧钛酸多聚体构成，利用该反应机理可以解释实验中的现象。反应机理的建立为PTA溶胶制备条件的优化和TiO2光催化薄膜的制备提供了理论指导。
new inorganic Sol-Gel method was introduced in this paper to prepare TiO2 photocatalytic thin films. The autoclaved sol (AS) was synthesized by using titanyl sulfate (TiOSO4), ammonia as raw materials and peroxide (H2O2) as complexing agent, the AS sol was neutral or alkalescent . The transarent nano anatase TiO2 thin films fixed on glass plate substrates were prepared from the AS precursor dried under infrared light and heated at 300℃, 500℃ for 30min, the FT-IR、XRD, SEM, UV-Vis and XPS were applied to characterized the AS sol and TiO2 thin films. The results indicated that the AS sol was light yellow, semitransparent and stable at room temperature, and contained needle-like anatase crystals which were 80nm in length and 20nm in diameter and well distributed in the sol. The dip-coated TiO2 films were transparent and its maximal light transmittance exceed 90% under visible light. The anatase crystals of the TiO2 films connected together to form netlike structure after calcined, and th
孙明、戈磊、徐明霞、方海波
无机化学工业非金属元素化学工业、非金属无机化合物化学工业电化学工业
过氧钛酸，水系溶胶， 络合胶溶， 反应机理，结构表征
peroxo titanic acid sol aquo-system sol complex peptization reactive mechanism structure characterization
孙明,戈磊,徐明霞,方海波.过氧钛酸水系溶胶的制备及溶胶性质和形成机理研究[EB/OL].(2005-05-27)[2025-08-10].http://www.paper.edu.cn/releasepaper/content/200505-141.点此复制
评论