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RISS 인기검색어
- 검색키워드
- 저자 : Chenze Qi (검색결과 3 건)
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Zhe Xiang,Xi Zhao,Guoxiang Wang,Chenze Qi,Sujing Zhou,Jinjing Li,Yong Gao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
Pickering emulsions were promising platforms for the heterogeneous reactions due to both their largeinterfacial areas and high stability, whereas both the product separation and the emulsifier recoveryvia simple and efficient strategies for remain a concern. In this study, we constructed an efficient andrecyclable platform for interfacial catalytic reaction adopting pH-responsive n-decane-in-waterPickering emulsions. Pickering emulsions were prepared employing core cross-linked PEO45-PGMA74(CCE45G74) diblock copolymer worms as Pickering emulsifiers. CCE45G74 diblock copolymer worms wereprepared via the combination of photo-initiated polymerization induced self-assembly strategy and thecore covalent cross-linking with ethylenediamine. The prepared n-decane-in-water Pickering emulsionsshowed a high stability during the storage at the room temperature, whereas a rapid demulsification tookplace at a lower pH, such as 2.5. Alkali-catalyzed Claisen-Schmidt condensation reactions between benzaldehydeand acetone were conducted in n-decane-in-water Pickering emulsions at 30 C. The yield ofdibenzylidene acetone could reach 99% after 12 h of reaction. The reaction efficiency was far higher thanthat at the plain n-decane-water (30%). This catalytic platform could be repeatedly used for three cycles
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Li Nie,Lulu Liang,Minjuan Jiang,Linjun Shao,Chenze Qi 한국섬유공학회 2018 Fibers and polymers Vol.19 No.7
Uniform chitosan fibers (CS/PEO) with diameter of 398±76 nm were prepared by electrospinning with merely 5 wt.% of poly(ethylene oxide) (PEO) loading, and then annealed at elevated temperature without the use of additional crosslinker to improve the thermostability and solvent resistance. Swelling test shows that the CS/PEO composite fibers annealed at 200 oC were stable in 50 wt.% acetic acid aqueous solution. The mechanical strength test shows that the annealing temperature can affect the tensile strength of CS/PEO composite fiber mat. The cross-linked CS/PEO composite fibers provide a useful platform for the immobilization of palladium catalyst to catalyze the Mizoroki-Heck reactions of aromatic halides with olefins. Moreover, these CS/PEO composite fibers could be post modified with special ligands to chelate palladium species efficiently to further improve the catalytic activity and stability.
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Kexin Peng,Jiankui Guo,Haifeng Chen,Mali Xie,Xi Zhang,Xudong Huang,Guiying Xing,Linjun Shao,Chenze Qi 한국섬유공학회 2023 Fibers and polymers Vol.24 No.11
In this paper, copper phthalocyanine and polystyrene composite superfine fibers were readily prepared by electrospinning technology. After treating these composite fibers with paraformaldehyde in concentrated H2SO4 solution, the copper phthalocyanine molecules were covalently bonded to the polystyrene molecules. Meanwhile, the polystyrene molecules in the fibers were cross-linked to endow these fibers with excellent solvent resistance. The photocatalytic performance of this novel fibrous catalyst was evaluated by photodegradation of methyl orange in the presence of H2O2. The effects of light source, H2O2 dosage, catalyst loading, and temperature on the fiber catalyzed photodegradation of methyl orange were carefully studied. The photodegradation percentage of methyl orange in aqueous solution was up to ~ 97% under optimized reaction conditions. At last, this fibrous catalyst was readily recovered by simple filtration and reused for three times with satisfied photodegradation activities. In all, we have developed a facile way to prepare copper phthalocyanine functionalized polystyrene superfine fibers with excellent photocatalytic performance.
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