Clary incorporated MOF for CO2 capture

https://doi.org/10.3390/en15093473

“Clay minerals are ubiquitous and are capable of interlayer and surface adsorption of CO₂. In addition, their modification allows for the improvement of CO₂ adsorption capabilities even more. The prospects of the most widely available clay minerals in the Baltic States for large-scale CO₂ emission reduction and suitable alternative approaches for clay modification to improve CO₂ adsorption capacity can be found in review [66]. Recently, clay-containing MOF-composites have been studied for various purposes. The main goal of clay-MOF-composites is to improve the properties of MOF, which would allow them to be used more efficiently in various fields. For instance, Xie et al. [67] have improved CuBTC with higher hydrothermal stability and catalytic activity by hybridization of CuBTC with natural clay attapulgite and montmorillonite affecting the size of Zn-BDC crystals [68] and improving the thermal stability of MOF-5 [69]. The improvement of hydrolytic stability is based on two types of co-ordination between MOF and clay. The -OH groups on the clay surface can co-ordinate with metal ions in MOFs, such as Cu in CuBTC, while the carboxyl groups of CuBTC can inversely chelate the Mg²⁺ and Al³⁺ of the clay [67]. Compared with GO, CNT, GA, and others, eco-friendly and low-cost natural materials could be preferable as filler additives. Articles published so far show that clay-containing materials can serve as a template for in situ MOF-composite synthesis [25,69]. Aminoclay (aminopropyl functionalized Mg phyllosilicate) has been used to stabilize in situ synthesized CuBTC, and CO₂ adsorption capacity was 39% higher than that of pristine MOF [25].”