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首页> 外文期刊>RSC Advances >Superior photocatalytic performance of LaFeO3/g-C3N4 heterojunction nanocomposites under visible light irradiation
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Superior photocatalytic performance of LaFeO3/g-C3N4 heterojunction nanocomposites under visible light irradiation

机译：LaFeO 3 / g-C 3 N 4 异质结纳米复合材料在可见光照射下的优异光催化性能

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摘要

New types of LaFeO3/g-C3N4 heterostructures were successfully prepared and the enhanced photocatalytic hydrogen evolution and degradation activities under visible light irradiation were determined. They possessed the features of a Z-scheme photocatalysis system. The photoexcited electrons on the conduction band of LaFeO3 were transferred to the valence band of g-C3N4 by the solid–solid intimately contacted interfaces, where the electrons and holes were recombined, and thus improved the separation of photogenerated electrons and holes of g-C3N4. The LaFeO3/g-C3N4 heterostructures showed a higher hydrogen evolution rate and a higher amount of ˙OH than pure LaFeO3 and g-C3N4. The construction of the LaFeO3/g-C3N4 heterostructures was used to demonstrate an effective strategy for improving the photocatalytic property. The 5%-LaFeO3/g-C3N4 exhibited the highest photodegradation and water splitting rate. More than 95% of methylene blue (MB) was degraded after 15 min in the presence of 25 mg EDTA-2Na in 100 mL MB solution which was irradiated using a 3 W light-emitting diode. The 5%-LaFeO3/g-C3N4 heterojunction nanocomposite had a maximum hydrogen evolution rate of 158 μmol g?1 h?1.
机译：新型LaFeO 3 / gC 3 N 4 成功地制备了小的异质结构，并确定了可见光辐照下增强的光催化氢释放和降解活性。它们具有Z方案光催化系统的功能。 LaFeO 3 的导带上的光激发电子被转移到gC 3 N 4 通过固-固紧密接触的界面，使电子和空穴重新结合，从而改善了gC 3 < / sub> N 4 。 LaFeO 3 / gC 3 N 4 异质结构比纯LaFeO 3 和gC 3 N表现出更高的氢释放速率和更高的˙OH含量 4 。 LaFeO 3 / gC 3 N 4 < / small>异质结构用于证明改善光催化性能的有效策略。 5％-LaFeO 3 / gC 3 N 4 < / small>表现出最高的光降解和水分解速率。 15分钟后，在25 mg EDTA-2Na在100 mL MB溶液中的存在下，用3 W发光二极管照射后，超过95％的亚甲基蓝（MB）降解。 5％-LaFeO 3 / gC 3 N 4 < / small>异质结纳米复合材料的最大氢释放速率为158μmolg ？1 h ？1 。

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