Cobalt nanoparticles embedded in porous N-doped carbon support as a superior catalyst for the p-nitrophenol reduction

Schiff Base Functionalized Cellulose: Towards Strong Support-Cobalt Nanoparticles Interactions for High Catalytic Performances

“…The reaction rate constants (k) determined from the slope of the Ln (C t /C 0 ) vs. time is 8.7 × 10 −3 s −1 . The catalytic performance of Co@DAC-OAP in nitrophenol reduction was found to be superior to that of other cobalt-based catalysts prepared or reported in the literature (Table S2) [49,50,78,[87][88][89][90][91][92].…”

“…The second is performed in an organic solvent but under hydrogen pressure and higher temperature, which is also known to favor sintering [48]. Thus, our supported catalyst was first evaluated for the reduction of 4-nitrophenol to 4-aminophenol based on the fact that CoNPs have been shown to be effective in nitroarene reduction catalysts [49,50]. Nitrophenols are the most refractory pollutants that can be found in chemical industry wastewater [51], resulting particularly from pesticide, herbicide, and insecticide manufacturing and degradation processes [52].…”

ZIF-Derived Co/Zn Bimetallic Catalytic Membrane with Abundant CNTs for Highly Efficient Reduction of p-Nitrophenol

“…Among them, MOFs have received much attention due to their ordered pore structure and high surface area. − Specially, zeolitic imidazolate framework-67 (ZIF-67) has many advantages such as excellent chemical and thermal stability and unique porous structure. − Through one-step pyrolysis, ZIF-67 can be transformed into N-doped carbon (CN) and metallic Co NPs, where the Co NPs are in situ encapsulated in CN . Unfortunately, the Co NPs obtained from the pyrolysis of ZIF-67 under high temperatures often suffer from severe fusion and aggregation, reducing the corresponding catalytic efficiency. To our knowledge, Zn atoms can act as a “fence” to expand the distance between adjacent Co atoms in space, and proper addition of Zn 2+ in the precursor can effectively avoid the aggregation of Co NPs during the pyrolysis .…”

“…30−32 Through one-step pyrolysis, ZIF-67 can be transformed into N-doped carbon (CN) and metallic Co NPs, where the Co NPs are in situ encapsulated in CN. 33 Unfortunately, the Co NPs obtained from the pyrolysis of ZIF-67 under high temperatures often suffer from severe fusion and aggregation, 34 reducing the corresponding catalytic efficiency. To our knowledge, Zn atoms can act as a "fence" to expand the distance between adjacent Co atoms in space, and proper addition of Zn 2+ in the precursor can effectively avoid the aggregation of Co NPs during the pyrolysis.…”