Rapid synthesis of cerium-UiO-66 MOF nanoparticles for photocatalytic dye degradation
Rapid synthesis of cerium-UiO-66 MOF nanoparticles for photocatalytic dye degradation
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快速合成用于光催化染料降解的 Ceium-UiO-66 MOF 纳米颗粒
DOI：
10.1039/d3dt00890h
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发表时间：
2023
影响因子：
4
通讯作者：
Ghadim E
中科院分区：
文献类型：
--
作者：
Ghadim E
采用前所未有的合成方法，从混合溶剂中通过沉淀形成一系列Ce-UiO-66-X （X = NH2， OH， H, NO2， COOH）金属有机骨架，配体和金属前驱体的分离溶液结合后瞬间结晶。这使得Ce-UiO-66-OH的首次直接合成成为可能。粉末x射线衍射（PXRD）表明，所有材料均为纯相，具有宽谱，表明纳米级晶畴大小。研究了uuo -66结构中不同官能团对苯-1,4-二羧酸酯连接剂的影响，在室温和紫外线照射下对两种阳离子（亚甲基蓝和罗丹明B）和阴离子（刚果红和芫花红S）染料进行降解。利用准一级动力学分析了无光条件下染料的吸附，Ce-UiO-66-NH2、Ce-UiO-66-OH和Ce-UiO-66-H材料在1 ~ 3分钟内对茜素红S和果果红具有较强的光催化活性。该材料在紫外和可见光下表现出优异的光稳定性和可回收性，PXRD检测显示结晶度没有损失，活性维持在5个循环以上，Ce-UiO-66-NH2的光稳定性为16小时。
An unprecedented synthesis method is used to form a series of Ce-UiO-66-X (X = NH2, OH, H, NO2, COOH) metal–organic frameworks by precipitation from mixed solvents, with instantaneous crystallisation on combining separate solutions of ligands and metal precursors. This allows the first direct synthesis of Ce-UiO-66-OH. Powder X-ray diffraction (PXRD) shows that all materials are pure phase with a broadened profile that indicates nano-scale crystallite domain size. The effect of different functional groups on the benzene-1,4-dicarboxylate linker within the UiO-66 structure has been investigated on degradation of two cationic (methylene blue and rhodamine B) and two anionic (Congo red, and Alizarin red S) dyes under UV and visible light irradiation at room temperature. Analysis of the dye adsorption in the absence of light is accounted for using pseudo-first order kinetics, and the Ce-UiO-66-NH2, Ce-UiO-66-OH, and Ce-UiO-66-H materials display a considerable photocatalytic activity to degrade Alizarin red S and Congo red rapidly between 1 and 3 minutes. The materials show excellent photostability and recyclability under UV and visible light, with no loss of crystallinity seen by PXRD and activity maintained over 5 cycles, with 16 hours photostability for Ce-UiO-66-NH2.