Ashutosh Agarwal, Hashan Nuwantha Thenuwara and Ping Wu
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引用次数: 0
摘要
本研究通过冷冻干燥和电纺丝技术制备了基于氧化镁/Mg(OH)2 的吸附剂,并对其二氧化碳吸附能力进行了研究。利用 XRD、N2-Ads-Des、FESEM、XPS 和 CO2-TPD 对合成的吸附剂进行了表征,并分别利用 TGA 和傅立叶变换红外光谱对其 CO2 捕获效率和机理进行了评价。冷冻干燥法制备的吸附剂在室温下对二氧化碳的吸附量接近 6.2 wt%,而电纺丝法制备的吸附剂只有 5.4 wt%。这种吸附剂之所以具有超强的二氧化碳捕获能力,是因为其活性位点具有较高的碱性强度,并且存在大量的表面氧空位/缺陷。通过冷冻干燥制备的吸附剂表现出丰富的表面碱性位点,从而增强了二氧化碳分子与 O2-(强位点)、Mg-O 对(中等位点)和 OH 基团(弱位点)的相互作用,分别形成了牢固固定的单齿/单齿、双齿螯合物和双齿桥接碳酸盐。虽然在这一过程中物理吸附和化学吸附并存,但二氧化碳的吸附主要由化学吸附位点主导。吸附剂的高表面碱性主导了 BET 表面积对二氧化碳捕获能力的影响。该研究首次应用冷冻干燥技术,实现了镁基吸附剂的简便、可持续和可扩展合成,可在室温下高效捕获二氧化碳。
Novel, facile, and scalable synthesis of magnesium based adsorbents via the freeze-drying technique for CO2 capture†
In this study, MgO/Mg(OH)2 based adsorbents were prepared via freeze-drying and electrospinning techniques, and their CO2 adsorption capacities were investigated. The synthesized adsorbents were characterized by XRD, N2-Ads–Des, FESEM, XPS, and CO2-TPD, while their CO2 capture efficiency and mechanism were evaluated by TGA and FTIR spectroscopy, respectively. The adsorbent prepared via freeze-drying displayed nearly 6.2 wt% CO2 adsorption at room temperature compared to only 5.4 wt% by the adsorbent prepared via electrospinning. This adsorbent's superior CO2 capture capacity was attributed to the high basic strength of the active sites and the presence of a substantial amount of surface oxygen vacancies/defects. The adsorbent prepared via freeze-drying exhibited abundant surface basic sites, which led to enhanced CO2 molecule interaction with the O2− (strong sites), Mg–O pairs (medium sites), and OH group (weak sites) forming firmly fixed unidentate/monodentate, bidentate chelate and bidentate bridged carbonates, respectively. Although both physical and chemical adsorption coexisted in the process, the CO2 adsorption was mainly presided over by the chemisorption sites. The high surface basicity of the adsorbents dominated BET surface area in governing the CO2 capture capacity. For the first time in this research, the freeze-drying technique was applied to enlighten the facile, sustainable, and scalable synthesis of magnesium-based adsorbents for efficient CO2 capture at room temperature.
期刊介绍:
Sustainable Energy & Fuels will publish research that contributes to the development of sustainable energy technologies with a particular emphasis on new and next-generation technologies.