The design and construction of high-performance photocatalysts with both strong visible light harvesting and effective electron transfer are highly desired in the photocatalysis field. Herein, a multi-ligand strategy based on the MOF materials is proposed. A three-ligand Ti-MOF EY/NH2/H-MIL-125 (ENHM) was prepared via a facile hydrothermal method, in which 2-aminoterephthalic acid (NH2-H2BDC), terephthalic acid (H2BDC) and Eosin Y (EY) were employed as three ligands. The push–pull effect induced by different substituent groups (–NH2 and –H) on the skeleton of NH2-H2BDC and H2BDC promotes the efficient transfer of photogenerated electrons from organic ligands to metal nodes; while the third ligand EY increases the number of photoexcited electrons by enhancing the visible light absorption ability. Among the three-ligand MOF photocatalytic materials, ENHM-2 performs the optimal H2 production activity of 2.15 mmol g−1 h−1, much higher than dual-ligand NH2/H-MIL-125 and EY/NH2-MIL-125 and single-ligand NH2-MIL-125. A probable mechanism was also proposed for the three-ligand MOFs. This multi-ligand strategy may open up a new direction toward the preparation of MOF-based photocatalytic materials with excellent photocatalytic performances.

中文翻译：

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用于高效光催化析氢的三配体 Ti-MOF


光催化领域非常需要设计和构建具有强可见光捕获和有效电子转移功能的高性能光催化剂。在此，提出了一种基于MOF材料的多配体策略。通过简便的水热法制备了三配体 Ti-MOF EY/NH2/H-MIL-125 (ENHM)，其中 2-氨基对苯二甲酸 (NH2-H2BDC)、对苯二甲酸 (H2BDC) 和曙红 Y (EY)被用作三个配体。 NH2-H2BDC和H2BDC骨架上不同取代基（-NH2和-H）引起的推拉效应促进光生电子从有机配体到金属节点的高效转移；而第三配体EY则通过增强可见光吸收能力来增加光生电子的数量。在三配体MOF光催化材料中，ENHM-2的最佳产氢活性为2.15 mmol g−1 h−1，远高于双配体NH2/H-MIL-125和EY/NH2-MIL-125和单配体 NH2-MIL-125。还提出了三配体 MOF 的可能机制。这种多配体策略可能为制备具有优异光催化性能的MOF基光催化材料开辟新的方向。