Defect engineering in novel broad-band gap hexaaluminate MAl12O19 (M=Ca, sr, Ba)-Based photocatalysts Boosts Near ultraviolet and visible light-driven photocatalytic performance
Defect engineering in novel broad-band gap hexaaluminate MAl12O19 (M=Ca, sr, Ba)-Based photocatalysts Boosts Near ultraviolet and visible light-driven photocatalytic performance
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DOI：
10.1016/j.mtchem.2022.100942
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发表时间：
2022-06
影响因子：
7.3
通讯作者：
S. Wang;H. Gao;Y. Jin;X. Chen;F. Wang;H. Yang;L. Fang;S. Tang;D. Li
中科院分区：
文献类型：
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作者：
S. Wang;H. Gao;Y. Jin;X. Chen;F. Wang;H. Yang;L. Fang;S. Tang;D. Li
通过聚丙烯酰胺凝胶法成功合成了 M(M = Ca, Sr, Ba)Al12O19、MAl12O19:Mn 和 MAl12O19:Mn:Ce 光催化剂。在SrAl12O19中Mn离子优先占据Al离子的位置，而没有证据表明Mn离子在(Ca,Ba)Al12O19中占据Al离子的位置。一锅聚丙烯酰胺凝胶法利用 MAl12O19 的快速成核、生长和异质结构构建，将所需的 Mn3O4 或 Mn3O4 和 CeO2 细球形颗粒固定在 MAl12O19 纳米片表面。所有MAl12O19:Mn:Ce光催化剂在近紫外和可见光照射下均表现出比M(M = Ca, Sr, Ba)Al12O19和MAl12O19:Mn光催化剂更出色的光催化降解亚甲基蓝活性。 n-p-n型双p-n异质结MAl12O19:Mn:Ce光催化剂光催化活性的提高可归因于M(M = Ca, Sr, Ba)Al12O19、CeO2和Mn3O4之间的协同效应，不仅提高了可见光响应能力，增强了载流子的迁移和分离效率，而且保留了载流子的强氧化或还原能力。该工作可为开发和设计用于有机染料降解和环境保护的高效异质结光催化剂提供n-p-n型双p-n异质结光催化体系。
The M(M = Ca, Sr, Ba)Al12O19, MAl12O19:Mn, and MAl12O19:Mn:Ce photocatalysts have been synthesized successfully through a polyacrylamide gel method. The Mn ion prefer to occupy the position of Al ion in SrAl12O19, while there is no evidence revealing that the Mn ion occupies the Al ion position in (Ca, Ba)Al12O19. The one-pot polyacrylamide gel method utilizes the fast nucleation, growth, and heterostructure construction of the MAl12O19to deliberately immobilize the desired fine spherical particles of Mn3O4or Mn3O4and CeO2on the surface of MAl12O19nanosheets. All the MAl12O19:Mn:Ce photocatalysts exhibited outstanding photocatalytic activities for the degradation of methylene blue than that of M(M = Ca, Sr, Ba)Al12O19and MAl12O19:Mn photocatalysts under near ultraviolet and visible light irradiation. The improved photocatalytic activity of n-p-n type double p-n heterojunction MAl12O19:Mn:Ce photocatalysts can be attributed to the synergistic effect among the M(M = Ca, Sr, Ba)Al12O19, CeO2, and Mn3O4, which not only improves the visible light response ability and enhances the migration and separation efficiency of charge carriers but also retains the strong the oxidation or reduction capacity of charge carriers. This work may provide a n-p-n type double p-n heterojunction photocatalytic system into the development and design high efficient heterojunction photocatalysts for the degradation of organic dyes and environmental protection.