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        Hydrothermal fabrication of robustly superhydrophobic cotton fibers for efficient separation of oil/water mixtures and oil-in-water emulsions

        Jintao Wang,Fenlan Han,Bo Liang,Guihong Geng 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-

        In this study, superhydrophobic and superoleophilic cotton fibers are fabricated by simple one-step hydrothermal route followed by modification with silane. The obtained fibers show selective sorption ability to the oils from water, high sorption capacities, excellent recyclability, and quick sorption rate. The fibers also exhibit outstanding superhydrophobic stability under a variety of corrosive solutions and hot water, which enables it application for the separation of the oils from harsh water environments. Moreover, the superhydrophobic fibers in conjunction with a tube (valid tube area: 0.5 cm2) that connected to a vacuum system (vacuum pressure: 0.03 MPa) is capable of collecting up to 200 times its self-weight in gasoline within 20 s. The coated fibers can also selectively harvest oils from oil/water mixtures under extreme turbulent condition. More importantly, the coated fibers can separate micronsized oil droplets from oil-in-water emulsions with a high separation efficiency (transparency for solvent oils: >91%) that is beyond what can be obtained by most traditional separation methods. All these performances make the as-prepared cotton fibers ideally suited for the oil-spill cleanups and water purification.

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        Synthesis of NiCo2S4 nanospheres/reduced graphene oxide composite as electrode material for supercapacitor

        Weijun Peng,Huilan Chen,Wei Wang,Yanfang Huang,Guihong Han 한국물리학회 2020 Current Applied Physics Vol.20 No.2

        The NiCo2S4 nanospheres arrayed on the surface of reduced graphene oxide (rGO) was fabricated via one-step hydrothermal method. The effect of initial feeding mass of Ni(NO3)2·6H2O and Co(NO3)2·6H2O to rGO on the microstructure and electrochemical performance of the as-prepared composites was studied. The results indicated that the specific capacitances of the composites were first increased and then reduced due to the aggregation of NiCo2S4 nanospheres. NiCo2S4 nanospheres/rGO composites exhibited a remarkable specific capacitance of 1406 F/g and excellent cyclic stability of 82.36% at the current density of 1 A/g, which were better than those of individual NiCo2S4 (792 F/g and 64.77%) counterpart. These results showed that the as-prepared NiCo2S4 nanospheres/rGO composites were outstanding candidate for electrode material of supercapacitors

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