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Metatitanic Acid Pseudomorphs after Titanyl Sulfates: Nanostructured Sorbents and Precursors for Crystalline Titania with Desired Particle Size and Shape
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acs.cgd.7b01349 Mariana Klementová 1, 2 , Monika Motlochová 1, 3 , Jaroslav Boháček 1 , Jaroslav Kupčík 1 , Lukáš Palatinus 2 , Eva Pližingrová 1 , Lórant Szatmáry 4 , Jan Šubrt 1
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acs.cgd.7b01349 Mariana Klementová 1, 2 , Monika Motlochová 1, 3 , Jaroslav Boháček 1 , Jaroslav Kupčík 1 , Lukáš Palatinus 2 , Eva Pližingrová 1 , Lórant Szatmáry 4 , Jan Šubrt 1
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A new preparation method for the synthesis of TiO2 microrods in aqueous media starting with solid hydrated titanyl sulfate crystals with defined morphology is presented. The method is based on the extraction of sulfate ions from the crystals and their replacement with hydroxyl groups in aqueous ammonia solution leaving the Ti–O framework intact. The particle size and morphology of the starting hydrated titanyl sulfate is closely preserved in the pseudomorphs of amorphous metatitanic acid including such details like the layered structure of the original hydrated titanyl sulfate crystals. When annealed up to 1200 °C, the rod-like morphology of particles is retained, while the phase composition changes to anatase/rutile. The rod-like particles of metatitanic acid possess excellent sorption properties toward radionuclides. The mechanism of pseudomorph formation is discussed based on the structures of the precursors, including the hitherto unknown structure of titanyl sulfate dihydrate determined by electron diffraction tomography.
中文翻译：
钛酰硫酸盐后的偏钛酸伪晶型：具有所需粒度和形状的结晶二氧化钛的纳米结构吸附剂和前体
合成TiO 2的新方法提出了在水介质中的微棒，其起始于具有确定形态的固体水合硫酸氧钛硫酸盐晶体。该方法基于从晶体中提取硫酸根离子并将其替换为氨水溶液中的羟基，从而使Ti–O骨架保持完整的方法。起始水合硫酸氧钛硫酸盐的粒度和形态被紧密保留在无定形偏钛酸的假晶型中，包括诸如原始水合硫酸氧钛硫酸盐晶体的层状结构之类的细节。当退火至1200°C时，颗粒的棒状形态得以保留，而相组成变为锐钛矿/金红石型。偏钛酸的棒状颗粒对放射性核素具有优异的吸附性能。
更新日期：2017-11-08
中文翻译：
钛酰硫酸盐后的偏钛酸伪晶型：具有所需粒度和形状的结晶二氧化钛的纳米结构吸附剂和前体
合成TiO 2的新方法提出了在水介质中的微棒，其起始于具有确定形态的固体水合硫酸氧钛硫酸盐晶体。该方法基于从晶体中提取硫酸根离子并将其替换为氨水溶液中的羟基，从而使Ti–O骨架保持完整的方法。起始水合硫酸氧钛硫酸盐的粒度和形态被紧密保留在无定形偏钛酸的假晶型中，包括诸如原始水合硫酸氧钛硫酸盐晶体的层状结构之类的细节。当退火至1200°C时，颗粒的棒状形态得以保留，而相组成变为锐钛矿/金红石型。偏钛酸的棒状颗粒对放射性核素具有优异的吸附性能。
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