Browsing by Author "Dai, YT"

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    ZnAl-LDH/wood-based antifouling membranes for high-flux and efficient oil/water separation
    Wu, K; Xu, JC; Jiang, YH; Jiang, Y; Yurekli, Y; Yue, XJ; Dai, YT; Zhang, T; Yang, DY; Qiu, FX
    An efficient and antifouling cutting-edge membrane was fabricated via growing hierarchical ZnAl-layered double hydroxides (LDHs) nanosheets on the wood template for enhanced separation of immiscible oil/water mixtures and emulsions. The retained vertical channels within the wood substrate facilitated impressive liquid flux, while the LDHs layer coated on the wood surface establishes a robust hydration layer that effectively repels oil droplets. The synergistic effect of these two elements enables efficient separation of immiscible oil/water mixtures and emulsions. The ZnAl-LDHs/wood membrane demonstrates a remarkable reduction in oil adhesion, achieving exceptional antifouling performance. This innovative membrane was adept at efficiently separating oil/water mixtures, exhibiting an impressive flux of 1.87 x 106 L.m-2.h-1 with a separation efficiency of 99 %. Furthermore, it successfully processes surfactant-free emulsions at a rate of 8279 L.m-2.h-1 (99.4 % efficiency) and surfactant-stabilized emulsions at 6850 L.m-2.h-1 (98.8 % efficiency). The current work combines natural wooden channel structures and hydration layers formed by superhydrophilic LDHs nanosheets, providing new novel insights and support for the development of highly efficient membranes with antifouling properties for oil/ water separation.
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    Large-scale fabrication NZVI rod arrays on cotton fiber surfaces for efficient selenium adsorption
    Zhang, T; Yu, HQ; Dai, YT; Yang, DY; Yurekli, Y; Qiu, FX
    Aiming to solve the worldwide challenge of selenium pollution and selenium deficiency in partial districts, a simple and effective in situ growth process combined with seed growth method was used to load nanoscale zero-valent iron (NZVI) on the surface of cotton fiber (NZVI/C) for efficient selenium adsorption. The SEM results indicated that the FeOOH rods are perpendicular to the fiber and rooted in its surface to construct the stable structure. The obtained NZVI/C composites have high chemical reactivity and exhibit efficient extraction effect on selenium and the test results are recorded by ICP. More importantly, by adjusting the temperature, time, pH, dosage, and other conditions during the adsorption process, the separation performance of the NZVI/C composites can be further enhanced. The adsorption process of NZVI/C composites was endothermic reaction, and surface adsorption dominates the whole adsorption process. Moreover, this method realizes the controllable preparation of the ordered NZVI rod arrays on the cotton fiber, which can effectively solve the agglomeration problem of NZVI, and it is expected to be promoted to various fiber materials for easy, cheap, and large-scale production.