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- 저자 : Liusha Cen (검색결과 2 건)
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Liusha Cen,Tao Tang,Fan Yu,Han Wu,Chengcai Li,Hailin Zhu,Yuhai Guo 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Semiconductormetal–organic framework (MOF) hybrid photocatalysts become a significant material totreating dyeing wastewater recently. Zinc-based metal–organic framework (ZIF-8) stands out amongnumerous photocatalysts for its stability and simplicity to prepare. In this work, the gourd-shaped ZIF-8/TiO2 nanocomposites are prepared in situ on anatase TiO2 by precursor method, and then ZIF-8/TiO2nanocomposites is supported on PVDF electrospinning nanofibers by blending method to form ZIF-8/TiO2 nanofibers (ZIF-8/TiO2 NFs). We compare the degradation ability of Rhodamine B by ZIF-8/TiO2NFs with different mass ratios and load rates. When the mass ratio of ZIF-8 to TiO2 is 2:1 and the loadingrate is 10%, the photocatalytic degradation efficiency of ZIF-8/TiO2 NFs reached 95.4%, and the degradationremained as high as 88.7% after cycling five times. The characterization results showed that ZIF-8 andTiO2 are connected by N Ti O chemical bond, which narrows the band gap and rebars the recombinationof the electron-hole pairs. The synergistic action of ZIF-8 and TiO2 largely improves the photocatalyticcapacity of ZIF-8/TiO2 NFs.
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Fabrication of recyclable UiO-66-NH2/PVDF hybrid fibrous membrane for Cr(VI) removal in wastewater
Fan Yu,Liusha Cen,Caihong Lei,Feichao Zhu,Lan Zhou,Hailin Zhu,Bin Yu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
Efficient and recyclable water treatment technology plays a vital role in practical application of Cr(Ⅵ)removal. Zr-based metal–organic framework (UiO-66-NH2) is widely used in wastewater treatmentdue to its water stability. Powdery UiO-66-NH2 has disadvantages of easy aggregation, reclamation difficultyand secondary pollution. In this work, UiO-66-NH2 was successfully loaded on electrospunpolyvinylidene fluoride (PVDF) fibers by in-situ growth to achieve efficient adsorption and photoreductionof Cr(Ⅵ). Grooved surface of PVDF fibers and truncated octahedron shape of UiO-66-NH2 ensuredthe loading uniformity and firmness. The loading rate and size of UiO-66-NH2 crystals increased withthe amount of trifluoroacetic acid (TFA) in the preparation process. Meantime, the introduction of TFAin synthesis was conducive to the separation efficiency of photogenerated carries. When the additionamount of TFA was 5 ml, UiO-PVDF-3 with loading rate of 44.8% exhibited best Cr(VI) adsorption andphotocatalysis performance. For the pure adsorption process, the adsorption capacity of UiO-PVDF-3 at90 min was 3.76 mg/cm2, and the corresponding removal rate was 95.8%. When visible light was applied,the Cr(VI) removal rate for UiO-PVDF-3 reached to about 95.0% at 45 min. Furthermore, regenerationexperiments showed UiO-PVDF-3 had excellent adsorption and photocatalysis reusability. Based on thismethod, synthesized UiO-66-NH2/PVDF hybrid membrane as a bifunctional material for adsorption andphotocatalysis realizes the reuse of UiO-66-NH2 crystals conveniently and avoids secondary pollutionduring Cr(VI) wastewater treatment.
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