Influence of solution concentration on the hydrothermal preparation of titania crystallites
Influence of solution concentration on the hydrothermal preparation of titania crystallites
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DOI：
10.1039/b009203g
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发表时间：
2001
影响因子：
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通讯作者：
Yanqing Zheng;Er-wei Shi;Zhizhan Chen;Wenjun Li;Xingfang Hu
中科院分区：
文献类型：
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作者：
Yanqing Zheng;Er-wei Shi;Zhizhan Chen;Wenjun Li;Xingfang Hu
以 TiCl4 水溶液为前驱体，采用水热法制备纳米/微米级二氧化钛粉末。在不同的反应温度和时间下，研究了 TiCl4 水溶液浓度对产物的形成、物相、形貌和晶粒尺寸的影响。增加TiCl4 的浓度有利于金红石型TiO2 的形成。当[TiCl4] < 0.5 mol dm−3 时，产物为金红石型和锐钛矿型粉末的混合物，金红石型粉末在所有结晶产物中的百分比随反应时间的变化而变化。当[TiCl4] = 0.5 mol dm−3 时，产物为纯金红石型粉末。根据过饱和溶液的成核和生长理论，粉末尺寸与浓度相关。提出了生长单元模型来解释相的形成。
Nano/micro-sized titania powders were prepared by a hydrothermal method using an aqueous solution of TiCl4 as precursor. The influence of the concentration of the aqueous TiCl4 solution on the formation, phase, morphology, and grain size of the products was investigated at various reaction temperatures and times. Increasing the concentration of TiCl4 favored the formation of rutile type TiO2. When [TiCl4] < 0.5 mol dm−3, the products were a mixture of rutile type and anatase type powders, the percentage of rutile type powders in all crystalline products varied with reaction time. When [TiCl4] = 0.5 mol dm−3, the product was a pure rutile type powder. The powder size was related to the concentration based on the nucleation and growth theory of supersaturated solutions. A growth unit model was proposed to explain the phase formation.