Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2018-01-11 , DOI: 10.1016/j.jhazmat.2018.01.025 Yan Wu , Hou Wang , Wenguang Tu , Yue Liu , Yong Zen Tan , Xingzhong Yuan , Jia Wei Chew
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Materials of perovskite-type structure have attracted considerable attention for their applications in photocatalysis. In this study, a novel composite of p-type LaFeO3 microsphere coated with n-type nanosized graphitic carbon nitride nanosheets was constructed by the quasi-polymeric calcination method with the aid of electrostatic self-assembly interaction. Results indicate that the LaFeO3/g-C3N4p-n heterostructured photocatalyst obtained, in contrast to the pure constituents, enabled improved visible-light absorption, and more efficient separation and migration of charge carriers via solid p-n heterojunction interfacial effect. Correspondingly, the LaFeO3/g-C3N4 composite allowed for higher visible-light-responsive photocatalytic activity for the degradation of Brilliant Blue, which was 16.9 and 7.8 times that of pristine g-C3N4 and LaFeO3, respectively. The photocatalytic degradation of Brilliant Blue was ascribed to the combined contributions of the photogenerated holes (h+), superoxide radicals (
O2−) and hydroxyl radicals (
OH). Based on solid p-n heterojunction interfacial interaction, a Z-scheme charge carrier transfer pathway integrated with the dye-sensitization effect is proposed as the underlying mechanism of the photocatalytic reaction process. Therefore, we believe that the perovskite-type LaFeO3/g-C3N4 Z-scheme photcatalyst promotes the development of photocatalysis and holds much promise for environmental remediation.
中文翻译：
稳定钙钛矿型LaFeO 3 / gC 3 N 4异质结构光催化剂的准聚合物结构，可通过固体pn异质结界面效应改善Z-方案的光催化活性
钙钛矿型结构的材料因其在光催化中的应用而引起了极大的关注。在这项研究中，通过静电自组装相互作用的准聚合煅烧方法，构建了一种新型的n型纳米石墨氮化碳纳米片包覆的p型LaFeO 3微球复合材料。结果表明，与纯组分相比，所获得的LaFeO 3 / gC 3 N 4 p - n异质结构光催化剂能够提高可见光吸收率，并通过固体p更有效地分离和迁移载流子- ñ异质结界面效果。相应地，LaFeO 3 / gC 3 N 4复合材料具有较高的可见光响应光催化活性，用于降解亮蓝，分别是原始gC 3 N 4和LaFeO 3的16.9和7.8倍。亮蓝的光催化降解归因于光生空穴（h +），超氧自由基（
Ø 2 - ）和羟基自由基（哦）。基于固体pn异质结界面相互作用，提出了一种与染料敏化作用相结合的Z型电荷载流子传递途径，作为光催化反应过程的内在机理。因此，我们认为钙钛矿型LaFeO 3 / gC 3 N 4 Z方案光催化剂促进了光催化的发展，对环境修复具有广阔的前景。
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