Synthesized structure of Mg-MOF-74 decorated on ZIF-8 as solid adsorbent for CO2 capture

Bhumin Than-ardna , Suphatra Hiranphinyophat , Masahiro Matsumoto , Vissanu Meeyoo , Boonyarach Kitiyanan
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Abstract

In this study, a ZIF-8/Mg-MOF-74 composite was synthesized using a simple post-modification method. Mg-MOF-74 was grown directly on ZIF-8, forming a hierarchical structure that combines molecular sieving and enhanced adsorption capabilities. The Mg-MOF-74 outer layer, rich in open metal sites (OMS), enables strong CO2 interactions. The optimized composite, prepared with a Mg2+/H4dhtp molar ratio of 1:1, exhibited a remarkable surface area of 823.61 m²/g and a pore volume of 0.76 cm3/g. It achieved exceptional CO2 capture, with 4.09 mmol/g in 12 % CO2 (simulated flue gas) and 0.066 mmol/g from ambient air at 30 °C and 60 % relative humidity. These findings demonstrate the efficacy of simple synthesis techniques in enhancing MOF-based CO2 capture. This work emphasizes the potential of integrating MOFs for efficient CO2 adsorption, offering promising strategies to address carbon emissions and environmental challenges.

Abstract Image

ZIF-8修饰Mg-MOF-74作为CO2捕集固体吸附剂的合成结构
本研究采用简单的后修饰法合成了ZIF-8/Mg-MOF-74复合材料。Mg-MOF-74直接生长在ZIF-8上,形成了一种结合了分子筛分和增强吸附能力的分层结构。Mg-MOF-74外层富含开放金属位(OMS),可以实现强的CO2相互作用。Mg2+/H4dhtp摩尔比为1:1时,复合材料的比表面积为823.61 m²/g,孔体积为0.76 cm3/g。它实现了卓越的二氧化碳捕获,在12%的二氧化碳(模拟烟气)中捕获4.09毫摩尔/克,在30°C和60%相对湿度的环境空气中捕获0.066毫摩尔/克。这些发现证明了简单的合成技术在增强mof基CO2捕获方面的有效性。这项工作强调了整合mof高效吸附二氧化碳的潜力,为解决碳排放和环境挑战提供了有希望的策略。
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CiteScore
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