State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
Key Laboratory of Textile Science & Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China.
J Hazard Mater. 2017 Feb 15;324(Pt B):203-212. doi: 10.1016/j.jhazmat.2016.10.050. Epub 2016 Oct 22.
Constructing nanostructured catalyst-embedded ceramic fibrous membranes would facilitate the remediation or preliminary treatment of dyeing wastewater, however, most of such membranes are brittle with low deformation resistance, thus, restricting their widely applications. Herein, the flexible and hierarchical nanostructured MnO-immobilized SiO nanofibrous membranes (MnO@SiO NFM) were fabricated by combining the electrospinning technique with hydrothermal method. The morphologies of membranes could be regulated from nanowires and nanoflower to mace-like structure via varying concentration of reactants. The resultant MnO@SiO NFM could cooperate with hydrogen peroxide to form a Fenton-like reagent for the degradation of methylene blue (MB). The resultant membrane exhibited prominent catalytic performance towards MB, including high degradation degree of 95% within 40min, fast degradation rate of 0.0865min, and excellent reusability in 5 cycles. Moreover, the membranes could be used in a wide pH range of 0 to 14 and the degradation degree reached 76% during dynamic filtration process with a flux of 490,000Lmh. The successful fabricating of such membrane with extraordinary catalytic performance would provide a platform for preparing high-performance catalysts for remediation of dyeing wastewater.
构建嵌入纳米结构催化剂的陶瓷纤维膜将有助于对印染废水进行修复或预处理，但大多数此类膜都很脆，变形阻力低，因此限制了它们的广泛应用。在此，通过将静电纺丝技术与水热法相结合，制备了柔性和分级纳米结构 MnO 固载 SiO 纳米纤维膜（MnO@SiO NFM）。通过改变反应物的浓度，可以将膜的形态从纳米线和纳米花调节为狼牙棒状结构。所得的 MnO@SiO NFM 可以与过氧化氢配合形成类 Fenton 试剂，用于降解亚甲基蓝（MB）。所得的膜对 MB 表现出突出的催化性能，包括在 40min 内降解度达到 95%，降解速率快，在 5 个循环中具有良好的可重复使用性。此外，该膜可在 pH 值为 0 至 14 的较宽范围内使用，在动态过滤过程中通量为 490,000Lmh 时，降解度达到 76%。这种具有卓越催化性能的膜的成功制备为制备用于处理印染废水的高性能催化剂提供了一个平台。
