Ti-MOFs基复合材料的制备及其光电催化性能研究

以钛酸异丙酯为节点,2-氨基对苯二甲酸为连接体,构建具有多孔结构的钛基金属有机骨架(Ti-MOFs),即NH₂-MIL-125(Ti),通过原位沉积法将花状多级结构的二硫化钼(MoS₂)负载至Ti-MOFs表面,制备了具有多活性位点的光电催化剂MoS₂/Ti-MOFs,并考察了MoS₂负载量对Ti-MOFs光电催化性能的影响。扫描电子显微镜、红外光谱仪、X射线光子能谱等用于表征材料的形貌、结构及组成,电化学工作站用于研究材料的光电化学性能。此外,使用MoS₂/Ti-MOFs作为光电催化剂对模拟有机污染物2,4,6-三氯苯酚(2,4,6-TCP)进行降解,通过测试模拟污染物的降解效率,评估了合成的催化剂的光电催化活性。研究结果表明,MoS₂可有效负载于Ti-MOFs表面,且MoS₂负载量为20wt.%时,合成的催化剂(MoS₂/Ti-MOFs-80)的光电催化性能最优。MoS₂/Ti-MOFs-80在可见光照射下的光电流密度达到了0.290 mA/cm²。在可见光下照射6 h后,MoS₂/Ti-MOFs-80对2,4,6-TCP的去除效率达到了82.59%,且模拟污染物循环降解实验证实了MoS₂/Ti-MOFs-80具有良好的光电催化稳定性。

Preparation and photoelectrocatalytic performance of Ti-MOFs based composites

Ti-MOFs (NH₂-MIL-125(Ti)) with porous structure were synthesized by using isopropyl titanate as metal node and 2-amino-terephthalic acid as linker. MoS₂/Ti-MOFs with multiple active sites were constructed via in-situ loading flower-like multistage MoS₂ onto Ti-MOFs surface, and the influence of MoS₂ amount on the photoelectrocatalytic performance of Ti-MOFs was investigated. The morphology, chemical structure, and composition of the catalyst were investigated by SEM, TEM, FTIR, and XPS, and electrochemical workstation was used to study the photoelectrochemical performance of the material. The catalytic capability of the synthesized MoS₂/Ti-MOFs was evaluated by measuring the photoelectrocatalytic degradation efficiency of 2, 4, 6-trichlorophenol (2, 4, 6-TCP) which was used as simulated organic pollutants. Results show that MoS₂ could be effectively anchored on Ti-MOFs surface, and Ti-MOFs loaded with 20% MoS₂ (MoS₂/Ti-MOFs-80) presented the best photoelectrocatalytic performance.The photocurrent density of MoS₂/Ti-MOFs-80 reached 0.290 mA/cm² under visible light irradiation. When MoS₂/Ti-MOFs-80 was used as catalyst, the removal rate of 2, 4, 6-TCP reached 82.59% after light irradiation for 6 h. Besides, it was confirmed that MoS₂/Ti-MOFs-80 exhibited satisfactory photoelectrocatalytic stability through the cyclic degradation tests of simulated pollutants.