Sm doped mesoporous CeO2 nanocrystals: aqueous solution-based surfactant assisted low temperature synthesis, characterization and their improved autocatalytic activity.

摘要: Mesoporous Sm3+ doped CeO2 (Ce–Sm) with a nanocrystalline framework, high content of Ce3+ and surface area (184 m2 g−1), have been synthesized through facile aqueous solution-based surfactant assisted route by using inorganic precursors sodium dodecyl sulphate as template. The XRD results indicate that the calcined Ce–Sm even as-prepared material cubic fluorite structure no crystalline impurity phase. studies along HRTEM confirmed formation mesoporous at lower temperature low 100 °C. A detailed analysis revealed doping in has increased lattice volume, area, mesopore volume engineered defects. Higher concentrations oxygen vacancies resulted lowering band gap. It is evident from H2-TPR strongly modified reduction behavior shifting bulk much temperature, indicating mobility sample which enables enhanced diffusion temperatures, thus promoting reducibility, i.e., process Ce4+ → Ce3+. UV-visible transmission improved autocatalytic performance due to easier Ce4+/Ce3+ recycling nanoparticles. From vitro cytotoxicity both pure 500 °C concentration μg mL−1 (even after 120 h) on MG-63 cells, obvious decrease cell viability observed, confirming their excellent biocompatibility. presence an amount hydroxyl groups, mesoporosity, defects contributed towards activity Ce–Sm, appear be potential candidate for biomedical (antioxidant) applications.