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Cleaner continuous flow production of mesoporous calcium-magnesium silicate as a potential biomaterial
Journal of Porous Materials ( IF 2.6 ) Pub Date : 2019-12-04 , DOI: 10.1007/s10934-019-00829-4
Chun Hui Zhou , Shu Ting Xia , Sridhar Komarneni , Freeman Bwalya Kabwe , Gui Chen Jin , Mao Quan Chu

Dolomite is an abundant, naturally occurring carbonate mineral, but the conventional processes of converting dolomite to new materials are time-consuming and energy-intensive. In addition, products from dolomite such as magnesium oxide, magnesium carbonate, magnesium hydroxide, which are used as adsorbents and additives, are mostly low value-added. Here, we demonstrated the conversion of dolomite to a mesoporous calcium-magnesium silicate (m-CMS) using a green and efficient continuous-flow synthesis method. The samples were characterized using powder X-ray diffraction, Fourier transformed infrared spectroscopy, N2 adsorption/desorption isotherms, thermogravimetric analysis, scanning electron microscopy and transmission electron microscopy. The material possessed mesoporosity and exhibited high a specific surface area of 629 m2/g and a pore volume of 0.66 cm3/g. The maximum water absorptivity of the sample was 52.6%. After the m-CMS immersing in Tris–HCl solution for 56 days, the weight loss ratio reached 30 wt%, indicating its good potential biodegradability. Hydroxyapatite was formed on the surfaces after the m-CMS was immersed in simulated body fluids. The m-CSM provided nucleation sites, and subsequently supplied Ca2+ for hydroxyapatite crystal growth, indicating that the material has potential bone conduction capability. This work suggests that m-CMS can be synthesized from dolomite and tetraethyl orthosilicate through a quick continuous process, and that the m-CMS could be used as a biomaterial.

中文翻译:

清洁连续生产中孔钙镁硅酸盐作为潜在的生物材料

白云石是一种丰富的,天然存在的碳酸盐矿物,但是将白云石转化为新材料的常规过程既费时又耗能。另外,白云石的产品,例如用作吸附剂和添加剂的氧化镁,碳酸镁,氢氧化镁,大多是低附加值的。在这里,我们演示了使用绿色高效的连续流合成方法将白云石转化为介孔硅酸钙镁硅酸盐(m-CMS)。使用粉末X射线衍射,傅立叶变换红外光谱,N 2表征样品吸附/解吸等温线,热重分析,扫描电子显微镜和透射电子显微镜。该材料具有中孔性,并显示出629 m 2 / g的高比表面积和0.66 cm 3 / g的孔体积。样品的最大吸水率为52.6%。将m-CMS浸入Tris-HCl溶液中56天后,失重率达到30 wt%,表明其潜在的生物降解性。将m-CMS浸入模拟体液后,在表面形成羟基磷灰石。m-CSM提供了成核位置,随后提供了Ca 2+对于羟基磷灰石晶体的生长,表明该材料具有潜在的骨传导能力。这项工作表明m-CMS可以通过快速连续的过程由白云石和原硅酸四乙酯合成,并且m-CMS可以用作生物材料。
更新日期:2019-12-04
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