Poly(4\|vinyl phenol) (PVPh) was synthesized from anisaldehyde via Perkin Doebner and decarboxyl reactions to form 4 methoxy styrene.It was then polymerized by free radical polymerization following dealkylation to for...Poly(4\|vinyl phenol) (PVPh) was synthesized from anisaldehyde via Perkin Doebner and decarboxyl reactions to form 4 methoxy styrene.It was then polymerized by free radical polymerization following dealkylation to form PVPh.A kind of stable multilayer utra thin film was successfully fabricated via self assembly technique from PVPh and diazoresin (DR) followed by UV irradiation.The driving force of self assembly was confirmed to be the hydrogen bonding attraction from diazonium group(—N + 2)of DR and phenolic hydroxy group(—Ph—OH)of PVPh.The film becomes very stable towards polar solvents after UV irradiation and it is believed that the H bonds between the layers of the film converts to covalent bonds following the decomposition of —N + 2 groups when the multilayer film underwent UV irradiation.展开更多
The scarcity and weak durability of metal,especially precious metal catalysts are big obstacles for their large-scale application in many reactions.The state-of-the-art of the catalytic science prefers such type of ca...The scarcity and weak durability of metal,especially precious metal catalysts are big obstacles for their large-scale application in many reactions.The state-of-the-art of the catalytic science prefers such type of catalysts,which can replace metal-based catalysts to alleviate energy and environmental crises and exhibit catalytic performance comparable to or even exceeding these metal catalysts.Herein,we report that N-doped porous carbon(NKC)derived from cheap and abundant radish can be employed as versatile and efficient bifunctional catalysts in both the catalytic reduction of 4-nitrophenol(NRR)and oxidation of styrene(SOR).The series of NKC catalysts were prepared with a simple and facile one-pot strategy by coupling the N-doping,carbonization and KOH activation processes.These catalysts show hierarchical porosity,with the specific surface area,total pore volume and N-doping content ranging from 918.9-3062.7 m^2 g^-1,1.01-2.04 cm^3 g^-1 and 1.29-15.3 at%,respectively.Interestingly,our finding suggests that the catalytic performance is not directly related to these parameters but correlates positively with the content of graphitic N dopants,which is the dominant contributor for impelling both the NRR and SOR.Another intriguing finding is that for both reactions,the optimal catalyst was found to be the NKC-3-800 which possesses the highest graphitic N content of 3.13 at%.In addition,to gain insight into the catalytic behavior,analyses of kinetics and thermodynamics were performed,and the catalytic mechanisms were postulated.This work paves the way for the construction of biomass-derived N-doped carbon catalysts for bi-or even multi-functional applications in various organic reactions.展开更多
文摘Poly(4\|vinyl phenol) (PVPh) was synthesized from anisaldehyde via Perkin Doebner and decarboxyl reactions to form 4 methoxy styrene.It was then polymerized by free radical polymerization following dealkylation to form PVPh.A kind of stable multilayer utra thin film was successfully fabricated via self assembly technique from PVPh and diazoresin (DR) followed by UV irradiation.The driving force of self assembly was confirmed to be the hydrogen bonding attraction from diazonium group(—N + 2)of DR and phenolic hydroxy group(—Ph—OH)of PVPh.The film becomes very stable towards polar solvents after UV irradiation and it is believed that the H bonds between the layers of the film converts to covalent bonds following the decomposition of —N + 2 groups when the multilayer film underwent UV irradiation.
文摘The scarcity and weak durability of metal,especially precious metal catalysts are big obstacles for their large-scale application in many reactions.The state-of-the-art of the catalytic science prefers such type of catalysts,which can replace metal-based catalysts to alleviate energy and environmental crises and exhibit catalytic performance comparable to or even exceeding these metal catalysts.Herein,we report that N-doped porous carbon(NKC)derived from cheap and abundant radish can be employed as versatile and efficient bifunctional catalysts in both the catalytic reduction of 4-nitrophenol(NRR)and oxidation of styrene(SOR).The series of NKC catalysts were prepared with a simple and facile one-pot strategy by coupling the N-doping,carbonization and KOH activation processes.These catalysts show hierarchical porosity,with the specific surface area,total pore volume and N-doping content ranging from 918.9-3062.7 m^2 g^-1,1.01-2.04 cm^3 g^-1 and 1.29-15.3 at%,respectively.Interestingly,our finding suggests that the catalytic performance is not directly related to these parameters but correlates positively with the content of graphitic N dopants,which is the dominant contributor for impelling both the NRR and SOR.Another intriguing finding is that for both reactions,the optimal catalyst was found to be the NKC-3-800 which possesses the highest graphitic N content of 3.13 at%.In addition,to gain insight into the catalytic behavior,analyses of kinetics and thermodynamics were performed,and the catalytic mechanisms were postulated.This work paves the way for the construction of biomass-derived N-doped carbon catalysts for bi-or even multi-functional applications in various organic reactions.
