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Surface Modification Method of Polyacrylonitrile (PAN) Fibers by L-cysteine Coupling Protein
Zixuan Yang,Yao Yao,Yujiao Huang,Wu Chen,Xiongwei Dong 한국섬유공학회 2019 Fibers and polymers Vol.20 No.12
This study reports an innovative environmental friendly polyacrylonitrile (PAN) fiber grafting modificationmethod, which is using L-cysteine as a coupling agent to link the hydrolyzed PAN fibers with protein macromolecules bycovalent bonds. After hydrolysis of PAN fibers, protein grafting was carried out after cysteine treatment. This method couldimprove the grafting efficiency of grafted polyacrylonitrile fiber without producing toxic by-products to human body andenvironment. The structure and surface appearance of the grafted fibers were characterized by FTIR, SEM, XRD and XPS. Itwas proved that the protein was successfully grafted onto the surface of acrylic fibers. The grafted fibers also showedimproved mechanical properties and good hygroscopicity.
Yue Zhang,Jie Huang,Zixuan Dong,Yu Zhan,Jiangbo Xi,Jian Xiao,Shaohua Huang,Fan Tian 한국탄소학회 2023 Carbon Letters Vol.33 No.1
A promising approach to enhance catalytic performance of supported heterogeneous nano-metal catalysts is to uniformly disperse active nanoparticles on the support. In this work, N-doped carbon-modified graphene (G@NC) nanosheet is designed and prepared to anchor Pd–Fe bimetallic nanoparticles (Pd–Fe/G@NC). The N-doped carbon modification on graphene surface could construct a sandwich-like structure (G@NC), which not only prevented the re-stacking of graphene nanosheets but also provided confined space for stable anchoring of bimetallic Pd–Fe nanoparticles. Benefitted from the unique structural property and synergetic effect of metal Pd and Fe species, the as-obtained Pd–Fe/G@NC composite displays excellent catalytic activity toward 4-nitrophenol reduction reaction with a turnover frequency of 613.2 min? 1, which is far superior to that of the mono-metal counterparts (Fe/G@NC and Pd/G@NC). More importantly, Pd–Fe/G@NC catalyst also exhibits favorable catalytic performance in the reduction of other nitroaromatic compounds (nitrobenzene, 4-nitrotoluene, 4-chloronitrobenzene, and so on). In addition, Pd–Fe/G@NC can catalyze the oxidation of furfuraldehyde to furoic acid with a high yield of 88.64%. This work provides a new guide for rationally designing and developing advanced supported heterogeneous bimetallic catalyst.