Oil/water separation becomes a research hotspot because of the frequent oil spill accidents. Although lots of separating membranes with super-wettability have been fabricated to separate oil or water from the mixtures, to separate both heavy (ρ oil > ρ water ) and light (ρ oil < ρ water ) oil/water mixtures with high efficiency and high flux is still a challenge, especially to obtain a membrane with mechanically robust nanostructures , and simultaneously anti-corrosive and self-cleaning ability. Herein, a novel titania nanostructured mesh membrane with superamphiphilicity in air, and dual superlyophobicity in liquid mediums were fabricated. Both high separation efficiency and flux of more than 99.2% and 16,954 L m −2 h −1 were obtained for both light and heavy oil/water mixtures. Importantly, the TiO 2 mesh membrane showed mechanically robust nanostructures and anti-corrosive ability, which can remain dual superlyophobicity, i.e., both underwater superoleophobicity and underoil superhydrophobicity and high oil-water separating behavior even after immersion in solutions of strong acid, basic, high salty, various organic solvents , and even after being abrased and adhered by pure sands and adhesive tape, respectively. Meanwhile, TiO 2 mesh membrane had shown photocatalytic decomposition of oil and organic molecules under UV irradiation, demonstrating unique self-cleaning and anti-fouling ability of the membranes. Given so many merits of these unique membranes, it is believed to these membranes have great potentials to be used in wastewater treatment and oil spill recovery.
Lin Liu,Yu Chen,Jiaojiao Chen,Wenda Liu,Guoxuan Tang,Haocun Wen,Zeyi Xiao,Senqing Fan
In order to achieve a balance between a good hydrogen evolution reaction (HER) performance and a low amount of catalyst loading, Pt@Ti membrane self-supporting electrodes have been fabricated by flowing synthesis. The characterizations by X-ray diffraction (XRD), X-ray photoelectric spectroscopy (XPS), and transmission electron microscopy (TEM) demonstrate the successful loading of Pt nanoparticles into the pores of a porous Ti membrane substrate. The scanning electron microscope (SEM) results demonstrate that the sizes of the Pt nanoparticles immobilized in Ti membrane pores are mostly in the range of 10–40 nm, and the average size was about 26 nm. The ICP test proves that the amount of Pt loading was only 0.760 mg cm–2. A minimum overpotential of 35 mV and a minimum Tafel slope of 30 mV dec–1 can be achieved for a Pt@Ti membrane self-supporting electrode at a current density of 10 mA cm–2 with 0.5 M H2SO4 as the electrolyte. No decay of current density is observed after a 10 h continuous electrolytic test. Besides, good HER performances can also be obtained under alkaline conditions and neutral conditions for Pt@Ti membrane self-supporting electrodes fabricated by flowing synthesis.
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