Xiao Ziyi, Li Yu, Fan Lu, Wang Yingxi, Li Ling
Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Function Molecules, Hubei University 430062, People's Republic of China.
Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Function Molecules, Hubei University 430062, People's Republic of China.
J Colloid Interface Sci. 2021 May;589:298-307. doi: 10.1016/j.jcis.2020.12.123. Epub 2021 Jan 5.
In this study, MIL-101(Fe) is prepared via a facile solvent-thermal method, and then applied as catalyst for activating PMS, thus generating reactive radicals for organic dyes removal in aqueous solution. Rhodamine B (RhB), Malachite Green (MG) and Methylene Blue (MB) were selected as model pollutants. The experiments showed that MIL-101(Fe)/PMS had higher removal efficiency for dyes than MIL-101(Fe), indicating that MIL-101(Fe) can be simultaneously used as adsorbent and PMS-activating catalyst for dyes removal. The effects of initial pH and the coexisted negative ions on MB degradation were further discussed, showing that MIL-101(Fe) can degrade MB with excellent stability. Furthermore, the reactive species in MIL-101(Fe)/PMS system were deduced as sulfate radicals and hydroxyl radicals. Finally, the degradation intermediates and possible degradation pathway were investigated by LC-MS.
在本研究中，通过简便的溶剂热法制备了MIL-101(Fe)，然后将其用作活化过一硫酸盐（PMS）的催化剂，从而产生活性自由基以去除水溶液中的有机染料。选择罗丹明B（RhB）、孔雀石绿（MG）和亚甲基蓝（MB）作为模型污染物。实验表明，MIL-101(Fe)/PMS对染料的去除效率高于MIL-101(Fe)，这表明MIL-101(Fe)可同时用作吸附剂和用于去除染料的PMS活化催化剂。进一步讨论了初始pH值和共存负离子对MB降解的影响，结果表明MIL-101(Fe)能够以优异的稳定性降解MB。此外，推断MIL-101(Fe)/PMS体系中的活性物种为硫酸根自由基和羟基自由基。最后，通过液相色谱-质谱联用（LC-MS）研究了降解中间体和可能的降解途径。
