Teng Pingping, Liu Ying, Sun Zhongqiao, Meng Hao, Han Yide, Zhang Xia
Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, P. R. China.
Dalton Trans. 2023 Aug 1;52(30):10472-10480. doi: 10.1039/d3dt01413d.
Development of binary MOF-on-MOF heterostructures is a research hotspot in MOFs chemistry due to the advantages elicited by a closely connected interface, which may endow more abundant functionality and even broader applications in interface chemistry. A MOF-on-MOF heterostructure was constructed by growth of MIL-88B on the outer surface of UiO-66. The resultant MIL-88B@UiO-66 produced had an interesting flower-like morphology composed of MIL-88B (petal) on tetrahedral UiO-66 (core). The MIL-88B@UiO-66 heterostructure showed adsorption and Fenton-like oxidation abilities, with distinctly improved structural stability in aqueous solution compared with that of single MIL-88B. Methylene blue (MB) was selected as the target molecule to evaluate the adsorption and Fenton-like oxidation activities. The efficiency of total removal of MB was studied systematically under various operating conditions and the influencing factors were optimized. The kinetics of adsorption and catalytic oxidation were simulated to explore the interactions between MB and MIL-88B@UiO-66. The mechanisms of enhanced adsorption and Fenton-like oxidation were suggested. The cyclic removal performance and structural stability of MIL-88B@UiO-66 were also determined.
二元金属有机框架（MOF）-on-MOF异质结构的开发是MOF化学领域的一个研究热点，这是由于紧密连接的界面所带来的优势，该界面可能赋予更丰富的功能，甚至在界面化学中具有更广泛的应用。通过在UiO-66的外表面生长MIL-88B构建了一种MOF-on-MOF异质结构。所得的MIL-88B@UiO-66呈现出一种有趣的花状形态，由四面体的UiO-66（核心）上的MIL-88B（花瓣）组成。MIL-88B@UiO-66异质结构表现出吸附和类芬顿氧化能力，与单一的MIL-88B相比，在水溶液中的结构稳定性明显提高。选择亚甲基蓝（MB）作为目标分子来评估吸附和类芬顿氧化活性。系统研究了在各种操作条件下MB的总去除效率，并对影响因素进行了优化。模拟了吸附和催化氧化的动力学，以探索MB与MIL-88B@UiO-66之间的相互作用。提出了增强吸附和类芬顿氧化的机制。还测定了MIL-88B@UiO-66的循环去除性能和结构稳定性。
