Alkaline metal oxides incorporated into porous templates are considered novel chemisorbents for capturing greenhouse gases including CO₂ at elevated temperatures. Thus, magnesium oxide nanoparticles (MONPs) and MONP incorporated graphene oxide (MONP–GO) were synthesized using a sol–gel method. Preparation of these materials was carried out by a three-step facile synthesis route involving: (1) synthesis of magnesium oxide (MO) nanoparticles (MONPs), (2) synthesis of graphene oxide (GO) from commercially available graphene, and (3) incorporation of MONPs on graphene oxide. Both MONP and MONP–GO samples exhibited a significantly high CO₂ uptake of 2.79–3.34 mmol g⁻¹ at two different elevated temperatures (60 and 120 °C). The increased CO₂ adsorption is due to the presence of terminal OH groups and acid–base pair sites at the magnesium (Mg²⁺–O²⁻) surface in the MONP and MONP–GO materials, respectively, resulting in the formation of hydrogen carbonate species and bidentate carbonate complexes with CO₂ gas. Our composite material also possesses intriguing properties including high thermal and chemical stabilities, low-cost, and environmental benignity along with its enhanced CO₂ sorption making it an excellent candidate for CO₂ capture in fossil fuel-based power plants at elevated temperatures.

中文翻译：

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新兴的研究人员系列：在氧化石墨烯纳米复合材料上制备的氧化镁纳米颗粒的合成，用于在高温下封存二氧化碳

掺入多孔模板中的碱性金属氧化物被认为是用于在高温下捕获包括CO ₂在内的温室气体的新型化学吸附剂。因此，使用溶胶-凝胶法合成了氧化镁纳米颗粒（MONPs）和掺有MONP的氧化石墨烯（MONP-GO）。这些材料的制备是通过三步轻松的合成路线进行的，该路线包括：（1）合成氧化镁（MO）纳米粒子（MONP），（2）从市售石墨烯合成氧化石墨烯（GO）以及（3） ）在氧化石墨烯上掺入MONP。无论是MONP样品还是MONP–GO样品，在两种不同的升高温度（60和120°C）下均显示出2.79–3.34 mmol g ^-1的高CO ₂吸收。增加的CO ₂吸附是由于分别在MONP和MONP-GO材料的镁（Mg ²⁺ –O ²⁻）表面存在末端的OH基和酸碱对位，从而导致形成碳酸氢盐和双齿与CO ₂气体形成碳酸盐络合物。我们的复合材料还具有令人着迷的特性，包括高的热稳定性和化学稳定性，低成本和环境友好性，以及增强的CO ₂吸附能力，使其成为在高温下以化石燃料为基础的发电厂捕获CO ₂的极佳候选者。