Developing a new type of superhydrophilic/underwater superoleophobic oil/water separation membrane with high separation efficiency, high throughput and bacteria separation has essential theoretical and practical significance for treating oily and medical wastewater. This work modified commercial PVDF membranes by knife coating and cross-linking, and PVDF/PVA/LPB/MOF hybrid separation membranes are manufactured. Hydrophilic polyvinyl alcohol (PVA) endows the separation membrane with good hydrophilicity. Lauramidopropyl Betaine (LPB) enhances intermolecular hydrogen bonding and improves the mechanical properties of the membrane. A Metal-organic framework (MOF) with excellent biocompatibility, UiO-66-NH₂, plays a vital role in the separation of bacteria. The results of the morphology and surface chemistry of characterization analysis show that the PVDF/PVA/LPB/MOF hybrid separation membrane exhibits excellent superhydrophilicity (with a contact angle of 2°) and high-water flux (15600 L/m²h) and high separation efficiency (99%), and the nature of filtering bacteria while separating oil. After modification, the separation efficiency increased from 30% to 99%, showing strong oil stain resistance. Our finding suggests that the new type of super-hydrophilic/underwater superoleophobic oil/water separation membrane has potential value in practical applications.

Polypropylene has been used for applications requiring high mechanical properties, good adhesion, chemical stability and insulation. Whereas, Polypropylene itself is flammable, and its limiting oxygen index (LOI) is low, which cannot pass the UL-94 combustion test. Therefore, extensive use will cause a serious threat to human life and property. With the wide application of thermoplastic polypropylene in industry, the development of environmentally friendly flame retardant materials has become an important research direction. For the past dozen years, researchers have been exploring flame retardants with high flame retardant efficiency, low toxicity, less smoke or other excellent performance flame retardants. This paper reviews the research progress of some phosphorus-containing flame retardants on the flame retardant properties of polypropylene in recent years. Phosphorus flame retardant is a flame retardant with high flame retardant efficiency, good stability and wide application. The types and flame retardant properties of phosphorus flame retardant will be introduced, and the future research of phosphorus flame retardant is summarized, direction and development opportunities.