Donghua University

About: Donghua University is a education organization based out in Shanghai, China. It is known for research contribution in the topics: Fiber & Nanofiber. The organization has 21155 authors who have published 21841 publications receiving 393091 citations. The organization is also known as: Dōnghuá Dàxué & China Textile University.

Microwave structured polyamide-6 nanofiber/net membrane with embedded poly(m-phenylene isophthalamide) staple fibers for effective ultrafine particle filtration

Abstract: Effective air filtration proposed for fibers requires their assembly into a porous structure with small pore size, low packing density, and controllable macro-structure; however, creating such filtration media has proved to be a grand challenge. Here, we introduce a strategy to create microwave structured polyamide-6/poly(m-phenylene isophthalamide) nanofiber/net (PA-6/PMIA NFN) membranes for effective air filtration by combining the electro-spinning/netting (ESN) and staple fiber intercalating process. Our approach causes the PA-6 NFN membrane composed of one-dimensional (1D) nanofibers and 2D Steiner-tree nanonets, and the embedded PMIA staple fibers, to assemble into a stable filtration medium with tunable pore size, packing density, and microwave fluctuation by facilely optimizing binary fiber construction and extrinsic staple fiber intercalation. By virtue of the integrated structural properties of small pore size (∼0.32 μm), high porosity (91.3%), and extended surface area, the resulting PA-6/PMIA NFN filter can effectively filter ultrafine airborne particles, mainly using physical sieving, with high filtration efficiency of 99.995%, low pressure drop of 101 Pa, desirable quality factor of 0.1 Pa−1, and large dust-holding capacity of >50 g m−2, which match well with the requirements for treating the real particulate matter (PM) pollutions. This work would not only provide great potential for PM2.5 governance, but also open new avenues for the design and development of stable porous membranes with controllable macro-structures for various applications.

Ni-Mo nanoparticles as co-catalyst for drastically enhanced photocatalytic hydrogen production activity over g-C3N4

Abstract: Photocatalytic water splitting is an environmentally friendly technique for sustainable solar hydrogen production, which requires low-cost and earth-abundant co-catalysts to replace expensive noble metal such as platinum. Herein, for the first time, we demonstrate noble-metal-free Ni-Mo alloys which has been widely attended in the field of electrocatalysis as co-catalysts to drastically enhance the activity of g-C3N4 visible light photocatalyst for H2 production from water. The novel Ni-Mo/g-C3N4 photocatalyst is in-situ synthesized by an effective and simple one-pot synthesis method. For the synthesized Ni0.4Mo0.6 and with optimized content of 10 wt%, composite photocatalyst Ni0.4Mo0.6/g-C3N4 shows the champion photocatalytic H2 generation rate 1785 μmol g−1 h−1, which is about 37 times higher than that of pure g-C3N4, and comparable to that of the optimized Pt/g-C3N4. Based on the detailed analyses of UV–vis diffuse reflectance spectroscopy, photoluminescence spectra, photocurrent response curves and electrochemical impedance spectroscopy Nyquist plots, the present good efficiency of Ni-Mo/g-C3N4 is mainly attributed to the presence of Ni-Mo alloys, which effectively promote the separation and suppress the recombination of photogenerated electrons and holes.