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      저자 : Zhengzhong Zhou (검색결과 2 건)
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        Layered double hydroxide nanosheets embedded β-cyclodextrin composite membranes with enhanced chiral separation performance

        Zhengzhong Zhou,Lingli Zhou,Yi Liu,Qian Wang,Xiaoshan Meng,Qigang Wu,Taoli Huhe 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-

        The technologies for enantiomeric resolution are essential to the development of pharmaceutical industry. The membrane technology has great potential in chiral separation owing to its low cost and highthroughput; however, the enantioselective of membrane is limited by the thickness of the active layer,which is closely related to the number of theoretical separation plates. In this work, the layered doublehydroxides (LDH) are synthesized by hydrothermal process and then vacuum filtrated with bcyclodextrin(b-CD) and polyvinyl alcohol (PVA) on a porous substrate to fabricate chiral selective membranes. 2D channels with increased number of separation stages are formed in the selective layer afterheat post-treatment. The enantiomeric excesses value is enhanced from 10.95% to 24.32% for racemicL/D- tryptophan resolution. This work provides a new approach for designing high performance chiralseparation membranes from the aspect of increasing the transport path.

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        Preparation of heteroatom isomorphously substituted MEL zeolite membranes for pervaporation separation of dimethylformamide/water mixtures

        Qigang Wu,Rong Xu,Hui Shao,Jing Zhong,Xiuxiu Ren,Zhengzhong Zhou 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.10

        The recovery of dimethylformamide (DMF) by pervaporation is less energy intensive and more economical than the traditional distillation method. High/pure silica zeolite is a typical organics perm-selective material for pervaporation membrane due to its hydrophobic nature, demonstrating great potential for recovering organic components from aqueous solutions. In this study, as an attempt to further enhance the membrane hydrophobicity, titanium and zirconium- substituted MEL type zeolite membranes (Ti-silicalite-2 and Zr-silicalite-2) were synthesized on the -Al2O3 discs by a secondary growth method. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) results confirmed the isomorphous substitution of the MEL framework by Ti and Zr atoms. The effects of isomorphous substitution, feed temperature and concentration on the DMF recovery performance were investigated via systematically designed pervaporation experiments. The fluxes and separation factors both increased with the isomorphous substitution of heteroatom, as well as increasing feed temperature and decreasing feed concentration. The Ti-silicalite-2 membrane exhibited a high separation factor of 6.4 with a total flux of 0.98 kg·m2·h1 for a 5wt% DMF/water feed at 343K.

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