Superhydrophilic and underwater superoleophobic membranes - A review of synthesis methods

A novel 2D/0D C 3 N 5 /Bi 2 WO 6 S-scheme heterojunction with enhanced structural defects has been designed for the efficient elimination of pharmaceutical antibiotics and Cr( vi ). 

In situ construction of a C3N5 nanosheet/Bi2WO6 nanodot S-scheme heterojunction with enhanced structural defects for the efficient photocatalytic removal of tetracycline and Cr(<scp>vi</scp>)

We synthesized a series of carbon-supported atomic metal-N-C catalysts (M-SACs: M=Mn, Fe, Co, Ni, Cu) with similar structural and physicochemical properties to uncover their catalytic activity trends and mechanisms. The peroxymonosulfate (PMS) catalytic activity trends are Fe-SAC>Co-SAC>Mn-SAC>Ni-SAC>Cu-SAC, and Fe-SAC displays the best single-site kinetic value (1.65×105  min-1  mol-1 ) compared to the other metal-N-C species. First-principles calculations indicate that the most reasonable reaction pathway for 1 O2 production is PMS→OH*→O*→1 O2 ; M-SACs that exhibit moderate and near-average Gibbs free energies in each reaction step have a better catalytic activity, which is the key for the outstanding performance of Fe-SACs. This study gives the atomic-scale understanding of fundamental catalytic trends and mechanisms of PMS-assisted reactive oxygen species production via M-SACs, thus providing guidance for developing M-SACs for catalytic organic pollutant degradation.

Activity Trends and Mechanisms in Peroxymonosulfate-Assisted Catalytic Production of Singlet Oxygen over Atomic Metal-N-C Catalysts

Cellulose–metal organic frameworks (CelloMOFs) hybrid materials and their multifaceted Applications: A review

Using Fiber as the based material for photocatalyst particles is favorable for their recovery, thereby avoiding the photocatalyst particles cause secondary pollution to water environment. In this work, the AgBr and Ag3PO4 photocatalyst particles were loaded onto the surface of chitosan fiber (CF) via chelation and in situ anion-exchange method. The photocatalytic results illustrated that the AgBr/Ag3PO4/CF composites displayed the best photocatalytic performance when the mass ratio of Ag3PO4 and AgBr onto the CF was approximately 1:0.15, their degradation rate can reach 98.1% for the methyl orange (MO) solution, this value far exceeded those of pure CF, AgBr/CF composites, and Ag3PO4/CF composites. Besides, the AgBr/Ag3PO4/CF composites also shown excellent durability, after the fifth cycle, they still maintained a decolorization rate of 86.4% for the MO solution, while the Ag3PO4/CF composites maintained a decolorization rate of only 70.7%. Based on these results, we consider that the AgBr/Ag3PO4/CF composites have high practical interest in environmental remediation.

Growth of AgBr/Ag 3 PO 4 Heterojunction on Chitosan Fibers for Degrading Organic Pollutants

In this study, two novel composite membranes containing nanoscale ZIF-8 and polyphenylene sulfide (PPS) nonwoven fabric were prepared via hydrothermal (PPS-ZIF-8) and biomimetic mineralization (PPS-ZIF-8-BSA; BSA, bovine serum albumin) approaches. The biomimetic mineralization approach in particular was extremely rapid and mild, and crystalline ZIF-8 was coated on the PPS substrate in only a few seconds at room temperature. The maximum iodine adsorption capacities of the PPS-ZIF-8 and PPS-ZIF-8-BSA membranes were 2.51 and 2.07 g/g, respectively. The composite fibrous membranes were able to capture trace iodine vapor under differential pressures ranging from 0 to 1000 Pa without almost any iodine vapor leakage. The composite membranes can be applied in harsh environments because of the excellent stability of ZIF-8 and the PPS high-performance fibers. This study provides a promising strategy to fabricate novel adsorption materials for the collection of radioactive iodine during nuclear waste disposal.

Polyphenylene Sulfide Ultrafine Fibrous Membrane Modified by Nanoscale ZIF-8 for Highly Effective Adsorption, Interception, and Recycling of Iodine Vapor.

In this work, the high strength and rigidity composites composed of ultra-high content of glass fiber fabrics (GFF) and polyphenylene sulfide (PPS) nonwovens were successfully fabricated by a facile thermo-compression lamination method. The mechanical property, wettability, crystalline behavior, rheological behavior and dynamic mechanical properties were systematically characterized. These results show that the optimum formula of 80 wt% GFF content (∼70 vol%) can achieve the best mechanical properties of the composite with excellent wettability among PPS and glass fibers. The tensile strength, fracture elongation, elastic modulus, flexural strength, flexural modulus, ILSS and un-notched impact strength can reach to 850.6 MPa, 10.5%, 910.5 MPa, 78.5 GPa, 67.4 MPa and 215.2 kJ/m2, respectively, which are elevated by 108.8%, 38.2%, 52.8%, 82.6%, 230.4% and 136.5% in comparation to those of GFF/PPS composites with 60 wt% GFFs. The increasing interfacial layers and riveting effect among GFFs effectively prevent the crack propagation, which are the main reasons for the enhancing mechanical properties of PPS composites with ultra-high content GFF. It is established that the GFF/PPS composite fabricated in this work has the characteristic of the highest mechanical performance and the highest content of GFFs in comparison with the reported PPS-based composites. This GFF/PPS composite is an ideal substitute for traditional metal and GF/epoxy composites.

High-performance polyphenylene sulfide composites with ultra-high content of glass fiber fabrics

Poly (phenylene sulfide) ultrafine fiber is one kind of high-performance fiber with high specific surface area, corrosion resistance, chemical and thermal stability, which can be widely applied in various domains. However, there are few reports about the review of PPS ultrafine fiber. To meet this demand, the paper provides an overall investigation about the fabrication process of PPS ultrafine fiber including sea-island melt spinning, melt electrospinning and melt-blown spinning as well as the application of PPS ultrafine fiber based materials like high temperature filter, lithium ion battery separator, high strength and high modulus composites, oil/water separation membrane, catalytic, adsorption, degradation membrane and so on.

Fabrication and application of poly (phenylene sulfide) ultrafine fiber

To dispose the increasing oil pollution, tremendous effective ways have been proposed to deal with the oil/water mixture. In this study, polyphenylene sulfide (PPS) microfiber membrane was firstly employed as the substrate for separation. Polyethylene wax (PEW) powder and polytetrafluoroethylene (PTFE) ultrafine powder were simply and effectively introduced on the PPS membrane by employing one-step spray-coating method. The as-prepared membrane displayed excellent oil affinity and water-repellent behaviors. Significantly, the obtained membrane showed long-term stability under various extreme conditions such as strong acid, alkali, salt solutions and high temperature. Moreover, this membrane could maintain high oil flux (above 3500 L/m2 h) and separation efficiency (above 98%) even after 20 cycles of oil/water separation and isolate a wide range of oil/water mixture effectively. The fabrication of superhydrophobic and superoleophilic PPS microfiber membrane presented here can be easily scaled up on a large scale, which will provide attractive potential in practical oil/water separation.

Yan Yu

Papers

Growth of AgBr/Ag 3 PO 4 Heterojunction on Chitosan Fibers for Degrading Organic Pollutants

Polyphenylene Sulfide Ultrafine Fibrous Membrane Modified by Nanoscale ZIF-8 for Highly Effective Adsorption, Interception, and Recycling of Iodine Vapor.

High-performance polyphenylene sulfide composites with ultra-high content of glass fiber fabrics

Fabrication and application of poly (phenylene sulfide) ultrafine fiber

Polyphenylene sulfide microfiber membrane with superhydrophobicity and superoleophilicity for oil/water separation