Meso-microporous carbon nanofibers with in-situ embedded Co nanoparticles for catalytic oxidization of azo dyes
Journal of Molecular Liquids(2019)
摘要
To meet the current challenges in the treatment of azo dye wastewater by advanced oxidation processes (AOPs), meso-microporous carbon nanofiber with in-situ embedded Co nanoparticles (Co/P-CNF) is developed by electrospinning Co salt/polyvinylpyrrolidone (PVP)/polyacrylonitrile (PAN) solution followed by carbonization process. The use of PVP as pore-forming agent in PAN solution promotes the formation of meso-microporous structure of P-CNF in carbonization phase, achieving micropore surface area of 98 m2 g−1 and mesopore surface area of 214 m2 g−1 by BET analysis. The heterogeneous catalytic performance of synthesized Co/P-CNF is evaluated by the degradation of Acid Red 1 (AR1) with peroxymonosulfate (PMS). Complete removal of AR1 of 50 × 10−6 M is achieved within 6 min by Co/P-CNF and PMS system. The superior catalytic performance of Co/P-CNF is attributed to both the nanofibrous morphology and meso-microporous structure due to using the pore-forming agent (PVP), which endow the uniform distribution of Co nanoparticles, favor the exposure of active sites and promote electron and mass transfer. Co/P-CNF not only possesses excellent magnetic property but also has good stability and recyclability, which is desirable for the practical application of the treatment of azo dye wastewater. Co/P-CNF is validated to activate PMS using Co0/Co2+/Co3+ for generating sulfate radicals, hydroxyl radical and singlet oxygen and then degrade AR1. Therefore, the combination of electrospun nanofibrous structure and the use of pore-forming agents is a promising strategy for the preparation of high-performance carbon nanofiber supported catalysts.
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关键词
Meso-microporous,Azo dye,Cobalt nanoparticle,Catalytic degradation,Carbon nanofiber
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