Mesoporous magnesium carbonate has been widely used in controlled release of drugs, adsorption or catalysis. In traditional methods, expensive alkoxide or MgO are usually employed as Mg-source to prepare mesoporous magnesium carbonate. Herein, based on the crosslinking property of ionic oligomers, a novel crosslinking ionic oligomer sol-gel method was proposed to prepare high-surface-area mesoporous magnesium carbonate using cheap MgCl·6HO and CO as material. (MgCO) crosslinking oligomer sols was produced based on the H-bond capping effects of ethanol and triethylamine. The evolution mechanism of crosslinking (MgCO) oligomer sols to gels was studied by using ATR-FTIR and NMR. The results indicated that with the slow volatilization of ethanol and triethylamine, a part of H-bond disappeared, which initiating the chain growth of (MgCO) oligomer molecules, and finally forming a crosslinking network. Combined with a CO critical point drying process, amorphous mesoporous magnesium carbonate nanoparticle with high surface area was obtained and characterized using ATR-FTIR, XRD, XPS, nitrogen adsorption/desorption analysis, SEM, TEM and EDS systematically. The specific surface area of magnesium carbonate reached 628 m g when the (TEA)/(Mg) was 40:1. Moreover, the general applicability of this method was verified. Mesoporous sulfate and phosphate were synthesized, which indicating the crosslinking oligomer sol-gel chemistry provided a general strategy for the construction of mesoporous inorganic oxysalt materials. Our work has important guiding significance for the preparation of other mesoporous materials that using cheap inorganic salt as raw material.

中文翻译：

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高比表面积介孔碳酸镁交联离子低聚物溶胶-凝胶合成及其通用性


介孔碳酸镁已广泛应用于药物的控制释放、吸附或催化。传统方法中，通常采用昂贵的醇盐或MgO作为镁源来制备介孔碳酸镁。本文基于离子低聚物的交联特性，提出了一种新型交联离子低聚物溶胶-凝胶方法，以廉价的MgCl·6HO和CO为原料制备高比表面积介孔碳酸镁。 (MgCO) 交联低聚物溶胶是基于乙醇和三乙胺的氢键封端效应生产的。利用 ATR-FTIR 和 NMR 研究了交联 (MgCO) 低聚物溶胶到凝胶的演化机制。结果表明，随着乙醇和三乙胺的缓慢挥发，部分氢键消失，引发(MgCO)低聚物分子的链增长，最终形成交联网络。结合CO临界点干燥工艺，获得了高比表面积的非晶介孔碳酸镁纳米粒子，并利用ATR-FTIR、XRD、XPS、氮气吸附/解吸分析、SEM、TEM和EDS系统地对其进行了表征。当(TEA)/(Mg)为40:1时，碳酸镁的比表面积达到628 m g。并且验证了该方法的普遍适用性。合成了介孔硫酸盐和磷酸盐，这表明交联低聚物溶胶-凝胶化学为介孔无机含氧盐材料的构建提供了通用策略。我们的工作对于以廉价无机盐为原料制备其他介孔材料具有重要的指导意义。