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- Title
Preparation of core-shell nanofiber encapsulated palladium composite membrane and its catalytic performance.
- Authors
MENG Jian-qiang; GAO Yao-zong; ZHANG Yu-feng
- Abstract
In order to solve the problems of the recovery difficulties and low reusability of the noble metal nanoparticle catalyst, core-shell PVP/PAN composite fiber membrane were prepared by coaxial electrospinning technology, in which palladium acetate was dissolved in PVP solution as the core, PAN solution as the shell, Zn(CH COO) as the pore forming agent. After immersion in deionized water and in -situ reduction of NaBH, a hierarchical porous core-shell Pd@PVP/PAN composite fiber catalytic membrane was prepared. The morphology and properties of Pd@PVP/PAN catalytic membrane were characterized by SEM, TEM, laser confocal microscopy and TG. The catalytic performance and reusability of the membrane were investigated by hydrochlorination of p-chlorophenol (4-CP). The results show that the electrospinning voltage and flow rate have great influence on the morphology of the fiber in the core-shell Pd@PVP/PAN composite membrane. When the mass fraction of PVP and palladium acetate in inner layer solution is 10% and 2%, the mass fraction of PAN and ZnAc in outer lay solution is 12% and 3%, respectively, and the electrospinning voltage is 3 kV, and the flow rate of inner and outer layer solution is 0.8 and 1.0 mL/h respectively, the fibers in the Pd@PVP/PAN catalytic membrane have a good core-shell structure, and this membrane has porous surface and good thermal stability. For 4-CP, the conversion rate of Pd@PVP/PAN composite catalytic membrane is 32% under continuous flow reaction conditions and room temperature in 3 h. After 5 cycles of repeated degradation, the catalytic degradation of 4-CP by the membrane can still maintain a conversion rate of 30%.
- Subjects
HOLLOW fibers; PALLADIUM; WATER immersion; PRECIOUS metals; DEIONIZATION of water; FIBROUS composites
- Publication
Journal of Tiangong University, 2020, Vol 39, Issue 5, p30
- ISSN
1671-024X
- Publication type
Article
- DOI
10.3969/j.issn.1671-024x.2020.05.005