Synthesis of hierarchically mesoporous polymeric carbon nitride with mesoporous melamine as a precursor for enhanced photocatalytic performance

Mechanochemical Synthesis of Nitrogen-Deficient Mesopore-Rich Polymeric Carbon Nitride with Highly Enhanced Photocatalytic Performance

“…By fitting the decay curves to a triple exponential model, I ( t ) = A 1 exp × (− t /τ 1 ) + A 2 exp × (− t /τ 2 ) + A 3 exp × (− t /τ 3 ) where I is the intensity, τ 1 – τ 3 are the lifetimes, and A 1 – A 3 are the amplitudes of relevant components, the PL lifetimes of the samples were obtained (see the inset table in Figure b). Apparently, the short and long lifetimes (τ 1 – τ 3 ) and the mean lifetimes (τ m = ( a 1 × τ 1 2 + a 2 × τ 2 2 + a 3 × τ 3 2 )/( a 1 × τ 1 + a 2 × τ 2 + a 3 × τ 3 ) where a 1 – a 3 represent the percentage of every lifetime) of CN-MAm and CN-MA400m are all shorter than those of CN, with those of CN-MA400m being the shortest, which benefits from the fastest charge transfer and subsequent nonradiative energy transition, manifesting the lowest charge recombination efficiency for CN-MA400m.…”

“…where a 1 − a 3 represent the percentage of every lifetime) 62 of CN-MAm and CN-MA400m are all shorter than those of CN, with those of CN-MA400m being the shortest, which benefits from the fastest charge transfer and subsequent nonradiative energy transition, 63 manifesting the lowest charge recombination efficiency 64 for CN-MA400m.…”

Surface Physicochemistry Modification and Structural Nanoarchitectures of g‐C3N4 for Wastewater Remediation and Solar Fuel Generation

“…[174] The numerous incidents of light reflection in hierarchical mesopores of hierarchically mesoporous CN (HMCN) had improved its photoabsorption together with the thinning of nanosheets due to the acceleration of charge separation. The preparation of bulk g-C 3 N 4 from MA precursor with the addition of Pluronic F68 template formed a very high nanoparticle [173] Copyright 2019, Elsevier.…”

“…The addition of hydrochloric acid solution to CMA turned the blocks structure of CMA into nanorods structure and mesoporous melamine (MMA) (see Figure ). [ 173 ] This structural modification process is detailed in Figure 11a, which displays the effect of acid and alkaline incorporation into MA precursors. The addition of sodium hydroxide recovered the initial structure of MA with a smaller particle size, suggesting continuous operation.…”

“…Figure 11. a) Schematic representation for samples morphology; SEM images of b) block structure of CMA; c) MMA; d) MMA-OH; e) MMA-OH-H; f) MMA-OH-H-OH; g) CNH; h) Schematic illustration for a hierarchically mesoporous structure of CNH. Reproduced with permission [173]. Copyright 2019, Elsevier.…”