Single-atom catalysis in advanced oxidation processes for environmental remediation

Abstract

This review presents the recent advances in synthetic strategies, characterisation, and computations of carbon-based single-atom catalysts, as well as their innovative applications and mechanisms in advanced oxidation technologies.

Construction of a Z-scheme g-C3N4/NBGO/BiVO4 heterostructure with visible-light driven photocatalytic degradation of tetracycline: efficiency, reaction pathway and mechanism

“…In recent years, semiconductor photocatalysis degradation technology has gained widespread interest as a green and environmentally friendly way to degrade organic pollutants in water. 12–15 Graphitic nitrogen carbide (g-C 3 N 4 , CN) is a typical n-type visible light photocatalyst that has gained extensive interest in photocatalysis due to its narrow band gap, wide visible light response, high thermochemical stability, outstanding photoelectrochemical properties, low cost, and ease of large-scale preparation. 2,16–18 However, the efficiency of a single semiconductor was restricted due to the rapid photogenerated electron (e − )–hole (h + ) recombination rate and the low visible light response efficiency.…”

Natural mineral modulated single atom catalyst for effective water treatment

“…Furthermore, the simulated EXAFS spectra were investigated based on the models of CoN 4 , CoSi 1 N 3 , CoSi 2 N 2 , and CoSi 3 N 1. It is shown that the experimental Co K-edge spectrum for p-1 ), and Co 2+ (4.74 min -1 ), respectively. It is worthwhile mentioning that the catalytic performance for PMS…”

“…•− ), singlet oxygen ( 1 O 2 ), and superoxide anion radical (O 2 •− ) [1][2][3][4][5][6] . Although cobalt ion (Co 2+ ) has been regarded as the most e cient species for homogeneous PMS activation, the potential environmental toxicity and carcinogenicity of residual Co 2+ severely impede its global scale application 7 .…”

“…In recent years, Co single atom catalysts (SACs), as one of the most emerging kinds of heterogeneous catalysts, possess special electronic structure, utmost Co atom utilization e ciency, and uniformly isolated Co active sites [11][12][13][14][15][16][17] . Such unique properties make Co SACs an attractive platform to bridge the gap between homogeneous and heterogeneous PMS activation 1,11,[17][18][19][20] .…”

Boosting heterogeneous Fenton reactions for degrading organic dyes via the photothermal effect under neutral conditions

“…[1][2][3] Despite promising progressions of Fenton reaction achieved for removal of refractory organic pollutants such as organic dyes, organic phenolic compounds and antibiotics, its practical application is still greatly limited by its intrinsic drawbacks of the demand of acidic conditions and generation of ferric hydroxide sludge. 4,5 To overcome these limitations, the heterogeneous Fenton reaction has been developed and explored as a promising alternative for degrading organics under neutral conditions. [6][7][8] Nonetheless, most reported heterogeneous Fenton reactions still exhibit insufficient activity at pH 7.0 when compared with their homogenous counterparts.…”