Graphene Oxide as Support for Layered Double Hydroxides: Enhancing the CO₂ Adsorption Capacity

Layered double hydroxides (LDHs) show great potential as CO₂ adsorbent materials, but require improvements in stability and CO₂ adsorption capacity for commercial applications. In the current study, graphene oxide provides a light-weight, charge-complementary, two-dimensional (2D) material that interacts effectively with the 2D LDHs, in turn enhancing the CO₂ uptake capacity and multicycle stability of the assembly. As a result, the absolute capacity of the LDH was increased by 62% using only 7 wt % graphene oxide (GO) as a support. The experimental procedure for the synthesis of the materials is based on a direct precipitation of the LDH nanoparticles onto GO followed by a structural and physical characterization by electron microscopy, X-ray diffraction, thermogravimetric analysis, and Brunauer–Emmett–Teller (BET) surface area measurements. Detailed titration confirmed the compatibility of the surface chemistry. After thermal decomposition, mixed metal oxides (MMOs) are obtained with the basic sites required for the CO₂ adsorption. A range of samples with different proportions of GO/MMO were prepared, fully characterized, and correlated with the CO₂ sorption capacity, established via TGA.