School of Science, North University of China, Taiyuan 030051, PR China; Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China.
Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
J Colloid Interface Sci. 2021 Apr 15;588:436-445. doi: 10.1016/j.jcis.2020.12.106. Epub 2020 Dec 31.
The reversible redox of methylene blue in organic solvents was highly attractive, yet was rarely reported. In this study, we realized the continuous filtration redox of methylene blue (MB) in dimethylsulfoxide (DMSO) through Fenton-like oxidization by using MnO loaded carbonaceous nanofibrous membrane (cPAN-MnO). The carbonaceous nanofibrous membrane (cPAN) was fabricated through electrospun of polyacrylonitrile and subsequent carbonization. The obtained cPAN nanofibrous membrane showed excellent stability in polar DMSO. MnO can be readily coated on cPAN nanofibers through an in situ redox reaction between cPAN and potassium permanganate. The fabricated cPAN-MnO membrane exhibited instantaneous reduction property towards MB in DMSO during a gravity-driven continuous filtration process. Interestingly, MB reduction was initiated by a typical Fenton-like oxidization, where hydroxyl radicals were firstly generated from hydrogen peroxide catalyzed by MnO in DMSO. Then hydroxyl radicals attacked DMSO to further produce methyl radicals, which resulted in the reduction of MB. In addition, MB reduction process in DMSO was reversible. Our study provides a novel strategy for continuous redox of MB in polar organic solvent and might give new ideas for MB applications.
亚甲蓝在有机溶剂中的可逆氧化还原反应非常吸引人，但很少有报道。在这项研究中，我们通过使用负载 MnO 的碳质纳米纤维膜（cPAN-MnO）进行芬顿样氧化，实现了亚甲蓝（MB）在二甲基亚砜（DMSO）中的连续过滤氧化还原。碳质纳米纤维膜（cPAN）是通过聚丙烯腈的静电纺丝和随后的碳化制备的。所得的 cPAN 纳米纤维膜在极性 DMSO 中表现出优异的稳定性。MnO 可以通过 cPAN 和重铬酸钾之间的原位氧化还原反应容易地涂覆在 cPAN 纳米纤维上。所制备的 cPAN-MnO 膜在重力驱动的连续过滤过程中对 DMSO 中的 MB 表现出瞬时还原性能。有趣的是，MB 的还原是由典型的芬顿样氧化引发的，其中 MnO 在 DMSO 中催化过氧化氢产生羟基自由基。然后，羟基自由基攻击 DMSO 以进一步产生甲基自由基，从而导致 MB 的还原。此外，MB 在 DMSO 中的还原过程是可逆的。我们的研究为在极性有机溶剂中连续氧化还原 MB 提供了一种新策略，并可能为 MB 的应用提供新的思路。
