Enhancing MgO efficiency in CO(2) capture: engineered MgO/Mg(OH)(2) composites with Cl(−), SO(4)(2−), and PO(4)(3−) additives

The formation of a MgCO(3) shell hampers CO(2) capture efficiency in MgO. Our previous studies developed MgO/Mg(OH)(2) composites to facilitate CO(2) diffusion, improving capture efficiency. However, MgCO(3) still formed along the interfaces. To tackle this issue, we engineered the MgO/Mg(OH)(2) interfaces by incorporating Cl(−), SO(4)(2−), and PO(4)(3−) additives. Novel MgO–H(2)O–MgX (X = Cl(−), SO(4)(2−), and PO(4)(3−)) composites were synthesized to explore the role of additives in preventing MgCO(3) formation. MgO–Mg(OH)(2)–MgCl(2) nano-composites displayed enhanced CO(2) adsorption and stability. This breakthrough paves the way for effective bio-inspired strategies in overcoming CO(2) transport barriers in MgO-based adsorbents.