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首页> 外文期刊>RSC Advances >Exfoliation of layered double hydroxides (LDHs): a new route to mineralize atmospheric CO2
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Exfoliation of layered double hydroxides (LDHs): a new route to mineralize atmospheric CO2

机译：层状双氢氧化物（LDHs）剥落：矿化大气中CO2的新途径

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Layered Double Hydroxide (LDH) of Mg-Al-Acetate (Mg/Al = 3) was prepared by an anion exchange method starting from a nitrate precursor. The high hydration energy of acetate was exploited to exfoliate LDH into nanosheets having a thickness of 2-3 nm. A colloidal suspension of LDH layers was freeze dried to retain the layers in the exfoliated state. Thermal decomposition of exfoliated LDH at 400 degrees C resulted in the mixed metal oxide having a surface area of 275 m(2) g(-1) which is higher than pristine LDH oxide (100 m(2) g(-1)). This enhanced surface area of exfoliated LDH is responsible for a large amount of CO2 sorption (1.4 mmol g(-1)) at room temperature as compared to pristine LDH (0.63 mmol g(-1)). This enhanced CO2 uptake is equal to some of the porous solids at similar conditions. The combination of aqueous exfoliation and the freeze drying technique has resulted in the successful synthesis of a novel CO2 adsorption sorbent based on LDHs.
机译：醋酸镁铝（Mg / Al = 3）的层状双氢氧化物（LDH）是从硝酸盐前体开始，通过阴离子交换法制备的。利用乙酸盐的高水合能将LDH剥落为厚度为2-3 nm的纳米片。将LDH层的胶体悬浮液冷冻干燥，以使层保持剥离状态。剥落的LDH在400摄氏度下热分解，导致混合金属氧化物的表面积为275 m（2）g（-1），高于原始LDH氧化物（100 m（2）g（-1））。与原始LDH（0.63 mmol g（-1））相比，这种剥落的LDH表面积的增加在室温下导致大量的CO2吸附（1.4 mmol g（-1））。在类似条件下，这种增加的CO2吸收量等于某些多孔固体。水剥离和冷冻干燥技术的结合已成功合成了基于LDHs的新型CO2吸附吸附剂。

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