1纳米 CeO2光催化性能的研究摘要：光催化材料从开始出现到现在经历的很多年的不断发展，截至目前，已经发现并且应用的材料很多。氧化铈是最活泼的稀土氧化物之一，具有良好的物理和化学性能，在催化、电化学、光化学、材料科学领域都有它的身影。本文研究了二氧化铈作为光催化材料的降解性能。其降解原理为二氧化铈在光照条件下价带吸收光能，价带上的电子和空穴分开，电子跃迁到导带上在价带上留下空穴，形成电子-空穴对。由价带迁移到导带上的电子与氧气结合生成超氧阴离子，在价带上由于电子的迁移而生成的空穴与水生成羟基自由基和氢离子。在二氧化铈分子的表面反生氧化还原反应，二氧化铈中的四价铈离子 Ce4+与过氧化氢发生还原反应生成氢离子、氧气和三价铈离子 Ce3+，然后三价铈离子 Ce3+与氢离子、过氧化氢生成四价铈离子 Ce4+和水。化学反应方程式为： CeO2+hv→CeO2+h++e- e-+O2→•O2- H2O+h+→H++ •OH H2O2+2Ce4+→2H++O2+2Ce3+ H2O2+2Ce3++2H+→2Ce4++2H2O 关键词：光催化，二氧化铈，降解2Study on photocatalytic properties of nano - CeO2Abstract: Photocatalytic materials have undergone many years of continuous development since their emergence. Up to now, many materials have been discovered and applied. Cerium oxide is one of the most active rare earth oxides with good physical and chemical properties. The degradation performance of cerium dioxide as photocatalytic material was studied. The degradation principle is that the valence band of cerium dioxide absorbs light energy under light conditions, the electrons and holes in the valence band are separated, the electrons transition to the conduction band and leave holes in the valence band, forming electron-hole pairs. The electrons migrated from the valence band to the conduction band combine with oxygen to form superoxide anions, and the holes in the valence band formed by electron migration and water to form hydroxyl radicals and hydrogen ions. On the surface of the cerium dioxide molecule, the Ce4+ of the tet...
