MIL-101(Fe)/g-C3N4 for enhanced visible-light-driven photocatalysis toward simultaneous reduction of Cr(VI) and oxidation of bisphenol A in aqueous media

Improved photodegradation of anionic dyes using a complex graphitic carbon nitride and iron-based metal–organic framework material

“…A decreased intensity of the peak at 1685 cm -1 in O-g-C3N4/MIL-53(Fe) compared to MIL-53(Fe) might be due to the integration of the graphitic carbon nitride into the composite material. A similar result in MIL-101(Fe)/g-C3N4 was reported by Zhao et al 45 O (C-O), respectively. 56 The N1s spectrum of this sample can be fitted using four peaks at 398.3, 399.9, 401.4, and 403.8 eV, which correspond to sp 2 N (C-N=C), tertiary N atoms (sp 3 N), amino-functional groups (C2-N-H) and π excitation, respectively.…”

“…44 MIL-101(Fe)/g-C3N4 heterojunction hybrids were also prepared via in-situ growth of MIL-101(Fe) onto a g-C3N4 surface. 45 These composites, with enhanced light absorption and efficient charge carrier separation, were employed as bifunctional photocatalysts for simultaneous reduction of Cr(VI) and degradation of bisphenol-A (BPA), exhibiting a clear enhancement in photocatalytic activity compared to either MIL-101(Fe) or g-C3N4 alone. Similar results were also reported on development of g-C3N4/NH2-MIL-101(Fe) for Cr(VI) reduction and methyl orange degradation 46 and g-C3N4/NH2-MIL-88B(Fe) for methylene blue degradation.…”

Understanding Surface Recombination Processes Using Intensity‐Modulated Photovoltage Spectroscopy on Hematite Photoanodes for Solar Water Splitting

“…Second, NiFeO x interfaces with hematite as a ‘sacrificial‐like’ redox couple, which can readily remove surface holes from hematite into its structure, effective oxidizing the NiFeO x first before oxidizing water. Notably, a broadened high frequency semicircle is presented in the α ‐Fe 2 O 3 /NiFeO x system compared to the hematite alone, suggesting a Cole−Cole relaxation . In such non‐ideal process, a dispersion of relaxation time constants is considered around the value of τ n (5.10 ms for α ‐Fe 2 O 3 /NiFeO x ), which could be attributed to multiple bulk recombination processes.…”

Engineering a Rapid Charge Transfer Pathway for Enhanced Photocatalytic Removal Efficiency of Hexavalent Chromium over C3N4/NH2–UIO‐66 Compounds

“…Generally, the CN/NU hybrids with a heterostructure demonstrated an enhanced Cr(VI) removal rate duo to effectively separate photoexcited electron–hole pairs and facilitated rapid charge transfer between these two components. [ 53,54 ] As described in Figure , both samples showed enhanced photocatalytic performance under visible light irradiation. It should be noted that CNU5 exhibited superior catalytic activity as compared to CN/NU5, indicating the photoexcited electrons can easily transfer to Cr(VI) and result in boosting the reduction of Cr(VI).…”