Antuo Wang,Xianglong Li,Teng Hou,Yishen Lu,Jing Zhou,Xianggui Zhang,Bin Yang
Recently, the membranes with durable and highly efficient separation performances for the purification of oil/water emulsions have drawn wide concern due to the great potential application in solving the problem of offshore oil spill and the discharge of oily wastewater. However, the crucial issues of low-permeability and severe membrane fouling seriously affect their application. Herein, we created an ultrafine tree-grapes-like poly(tetrafluoroethylene) (PTFE) fibrous membrane (UTPFM), which aimed to provide a fibrous membrane with ultrahigh permeability and separation efficiency. The fibrous membrane with regular grapes on fiber surface was fabricated by sintering electro-centrifugal spinning ultrafine fibrous poly(vinylpyrrolidone) (PVP)/PTFE membranes. The size and number of grapes could be simply controlled by the PVP/PTFE ratios, and brought water contact angle (WCA) of obtained fibrous membrane up to 154.6°. As a result, the obtained fibrous membrane presented ultrahigh permeability up to 3200 L m -2 h −1 and high separation efficiency more than 99%. Moreover, the grape structures on fiber surface were demonstrated to bring without any changes after 1000 cycles of abrasion. Therefore, the obtained membrane exhibits a great potential application in the long-term, stable and efficient oily wastewater separation.
The synergistic removal of multiple pollutants from flue gas has attracted growing interest in recent years. In this study, Cu-doped MnCeO x catalysts were synthesized via an impregnation method and integrated into PTFE fibers using a split-film process to enable the simultaneous removal of chlorobenzene (CB) and nitrogen oxide (NO). Among the catalysts tested, Mn 2 Ce 1 Cu 0.6 O x exhibited the highest performance, achieving 90 % CB degradation and 100 % NO conversion at 180 °C. The PTFE-based catalytic fibers also demonstrated excellent removal efficiency, reaching 83.7 % for dioxins at the same temperature. A possible reaction mechanism is proposed in which the NH 3 -SCR process facilitates CB oxidation by generating reactive intermediates. Cu doping was found to enhance the density of acid sites and promote the ring-opening of CB, thereby suppressing chlorine accumulation and improving catalyst stability. These findings provide valuable insights for the development and optimization of catalytic bag filters for the efficient, synergistic removal of multiple pollutants from industrial emissions.
危险品化学品经营许可证（带存储）