Efficient activation of peroxymonosulfate by C₃N₅ doped with cobalt for organic contaminant degradation

Abstract

Activation of peroxymonosulfate (PMS) by metal-doped C-N-based materials have been used extensively for pollutant degradation, but usually suffers from low efficiency and stability due to relatively low N coordinate sites,...

Engineered g-C3N5-Based Nanomaterials for Photocatalytic Energy Conversion and Environmental Remediation

“…In terms of material fabrication, Fang et al [ 32 ] prepared pristine g-C 3 N 5 according to Zhang’s method [ 28 ] and pyrolyzed a mixture of it with potassium chloride, lithium chloride, and cobalt chloride dihydrate to prepare cobalt-doped g-C 3 N 5 , whose doping pattern is shown in Figure 7 a. HR-TEM images ( Figure 7 b), HAADF-STEM images ( Figure 7 c), and elemental mapping ( Figure 7 d–f) all show that individual nitrogen atoms are uniformly doped into g-C 3 N 5 . In addition, it was also confirmed that the configuration of Co-N 4 was formed by the combination of Co with pyridine nitrogen in g-C 3 N 5 , as confirmed by the XANES spectra ( Figure 7 g) and R-space of XANES ( Figure 7 h).…”

“…Ding et al [ 39 ] demonstrated PDA-g-CN-1.0 obtained by coating g-C 3 N 5 with polydopamine could effectively activate PMS without light to generate high-potential C-PMS* complexes, which could completely oxidize SMX within 5 min. Fang et al [ 32 ] demonstrated that Co-C 3 N 5 can activate PMS without light to completely degrade PCB28 within 30 min, which was significantly superior to the traditional metal-based activation. It was found that sulfate radical was the main active species for PCB28 degradation, which was generated from the decomposition of PMS activated by Co-N4.…”

“… Co-C 3 N 5 ( a ) Doping structure; ( b ) HR-TEM image; ( c ) HAADF-STEM images; ( d – f ) elemental mapping; ( g ) XANES spectra; ( h ) R-space of XANES; ( i ) FT-IR spectra; ( j ) XPS spectra of Co 2p ; ( k ) Tauc’s plot. ( a – h ) Adapted with permission from [ 32 ]. Copyright Royal Society of Chemistry, 2022.…”

Tetracycline degradation mechanism of peroxymonosulfate activated by oxygen-doped carbon nitride

“…However, increasing the catalyst dosage decreased the reaction rate at 20-40 min, which may be caused by excess active reduction sites in O-C 3 N 4 competing with TC for free radicals. 29 Fig. 5(b) showed the effect of PMS dosage on the TC degradation performance.…”

Reinforced Photogenerated Electrons in Few-Layer C3N5 for Enhanced Catalytic NO Oxidation and CO2 Reduction

“…The polymer carbon nitride of C 3 N 5 is emerging to meet a historic destiny due to its better visible-light response, higher potential of the conductive band (CB), and higher N ratio for optimal adsorption capability and enhanced electron transfer in comparison to traditional C 3 N 4 . − However, bulk C 3 N 5 still needs to be upgraded in the photogenerated carrier dynamics for efficient photoactivity. Although approaches including heterostructure building − and element/ion doping − have been adopted, such additional semiconductors and/or element/ion introduction do not ensure the stability of catalysts. An ultrathin nanosheet usually provides some unique properties, such as the larger surface area, better diffusion, more reaction sites, and higher-efficiency separation and mobility of charge carriers, for better photoactivity of a semiconductor. ,, Moreover, it is well-known that most of the C 3 N 5 -based photocatalysts focus on environmental catalysis, especially for organic pollutant degradation, and a small portion of them are used for hydrogenation evolution.…”