CO2 adsorption at room temperature on Zr-functionalized SBA-15 materials: Role of Si/Zr ratio

Carbon dioxide (CO2) emissions have produced global concern due to their impact on global warming. Therefore, adsorption methodologies have emerged as an alternative to mitigate this problem. Here, we synthesized a series of Zr-functionalized SBA-15 materials using the pH-adjusting method, varying the Si/Zr ratio to assess CO2 adsorption. The materials were fully characterized revealing the formation of mesoporous SBA-15 with Zr species effectively introduced into the framework, generating basic sites to improve CO2 adsorption capacity, where the Zr-SBA-15-10 sample stood out from others with 7.44 mg/g. Finally, pseudo-first-order (PFO) kinetics best described the adsorption process for all samples.