The photocatalytic capabilities of La₂O₃ incorporated in CeO₂ for the removal of Pb(II) ions in water are reported in this work. La₂O₃–modified CeO₂ particles are prepared by a solid-state reaction method at calcination temperature of 1000 °C and 1400 °C. The x-ray diffraction result demonstrates a solid solution Ce_0.9La_0.1O_1.95 phase coexisting with the CeO₂ matrix phase (Ce_0.9La_0.1O_1.95–CeO₂) obtained at a calcination of 1400 °C, while the mixed La₂O₃/La(OH)₃–CeO₂ phase is obtained at 1000 °C. The UV-photocatalytic activity for Pb(II) ion removal of the La₂O₃–modified CeO₂ particles is significantly higher than that of pure CeO₂. Ce_0.9La_0.1O_1.95–CeO₂ particles show stronger visible light absorption capacity and higher ability of photoelectrodeposition for the Pb(II) ion removal than the mixed La₂O₃/La(OH)₃–CeO₂ particles and pure CeO₂. The high photocatalytic activity is supported by a strong photoluminescence signal from the Ce_0.9La_0.1O_1.95–CeO₂ particles, suggesting a high efficiency of photogenerated charge separation. A formation of p-type Ce_0.9La_0.1O_1.95 and n-type CeO₂ heterojunctions in Ce_0.9La_0.1O_1.95–CeO₂ particles also promote photogenerated charge transfer and efficiency restraining recombination of the charges.

这项工作报道了掺入CeO _2中的La ₂ O ₃去除水中Pb（II）离子的光催化能力。La ₂ O ₃改性的CeO ₂颗粒是通过固态反应方法在1000°C和1400°C的煅烧温度下制备的。X射线衍射结果表明，固溶体Ce _0.9 La _0.1 O _1.95相与1400°C煅烧时获得的CeO ₂基体相（Ce _0.9 La _0.1 O _1.95 –CeO ₂）共存，而混合La ₂ O在1000°C下获得₃ / La（OH）₃ -CeO ₂相。La ₂ O ₃改性的CeO ₂颗粒对Pb（II）离子的紫外光催化活性明显高于纯CeO ₂。与混合的La ₂ O ₃ / La（OH）₃ -CeO ₂颗粒和纯CeO ₂相比，Ce _0.9 La _0.1 O _1.95 -CeO ₂颗粒具有更强的可见光吸收能力和更高的光电沉积能力，可去除Pb（II）离子。。Ce _0.9 La _0.1 O _1.95 –CeO ₂粒子发出的强光致发光信号支持了高光催化活性，表明光生电荷分离的效率很高。在Ce _0.9 La _0.1 O _1.95 –CeO ₂颗粒中形成p型Ce _0.9 La _0.1 O _1.95和n型CeO ₂异质结也促进了光生电荷转移并抑制了电荷的重组。