We report the template-free, low-temperature synthesis of a stable, amorphous, and anhydrous magnesium carbonate nanostructure with pore sizes below 6 nm and a specific surface area of ∼ 800 m2 g−1, substantially surpassing the surface area of all previously described alkali earth metal carbonates. The moisture sorption of the novel nanostructure is featured by a unique set of properties including an adsorption capacity ∼50% larger than that of the hygroscopic zeolite-Y at low relative humidities and with the ability to retain more than 75% of the adsorbed water when the humidity is decreased from 95% to 5% at room temperature. These properties can be regenerated by heat treatment at temperatures below 100°C.The structure is foreseen to become useful in applications such as humidity control, as industrial adsorbents and filters, in drug delivery and catalysis.
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机译：我们报告了无模板，低温合成的稳定，无定形和无水碳酸镁纳米结构，孔径小于6 nm，比表面积约为800 m 2 g - 1 ，基本上超过了所有前述碱土金属碳酸盐的表面积。新型纳米结构的吸湿性具有独特的特性集，包括在低相对湿度下比吸湿型沸石Y的吸附能力大50％左右，并在吸附时保留超过75％的水分。室温下湿度从95％降至5％。这些特性可以通过在低于100°C的温度下进行热处理来再生。预计该结构将在湿度控制等应用中用作工业吸附剂和过滤器，并在药物输送和催化中发挥作用。
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