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Deliquescent behavior of calcium phosphate materials synthesized by sol–gel technique
Journal of Sol-Gel Science and Technology ( IF 2.5 ) Pub Date : 2020-10-31 , DOI: 10.1007/s10971-020-05425-6
Raquel Luiza Mageste Fonseca , Bruno de Souza Gonçalves , Julio Cézar Balarini , Eduardo Henrique Martins Nunes , Manuel Houmard

Water storage and purification, as well as dehydration processes, are a cause of concern for many healthy and industrial issues. In this work, calcium phosphate (CaP) materials with high water capture performance were prepared by sol–gel synthesis. After their structural characterization by several techniques, they were used in water capture tests performed in temperatures ranging from 25 to 45 °C using a climatic chamber kept at a relative humidity of 60%. The CaP samples showed a higher water uptake capacity than a commercial silica sample commonly used as a water adsorbent, despite the low surface area and pore volume displayed by the former. Moreover, different from the silica adsorbent, the studied CaP materials were submerged by the captured water after the first day, which suggests a deliquescent behavior. The CaP mass uptakes reached around 350% when tested at 25 °C and the materials release the adsorbed water quickly when heated at 100 °C. It was also demonstrated that the materials prepared here maintained their structural integrity even after the deliquescence step, which could allow their use for many cycles.



中文翻译:

溶胶-凝胶法合成磷酸钙材料的潮解特性

储水和净化以及脱水过程是引起许多健康和工业问题的原因。在这项工作中,通过溶胶-凝胶合成制备了具有高集水性能的磷酸钙(CaP)材料。在通过几种技术对其结构进行表征后,将它们用于在25至45°C的温度范围内使用保持在60%相对湿度的气候室进行的集水测试中。尽管前者显示出较低的表面积和孔体积,但CaP样品显示出比通常用作吸水剂的商业二氧化硅样品更高的吸水能力。此外,与二氧化硅吸附剂不同,第一天后,所研究的CaP材料被捕获的水淹没,这表明潮解行为。在25°C下进行测试时,CaP质量吸收达到350%左右,并且在100°C下加热时,材料会迅速释放出吸附的水。还证明了,即使在潮解步骤之后,此处制备的材料仍保持其结构完整性,这可以允许它们使用多次。

更新日期:2020-10-31
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