Designing 3D‐MoS₂Sponge as Excellent Cocatalysts in Advanced Oxidation Processes for Pollutant Control

Abstract

3D-MoS 2 can adsorb organic molecules and provide multidimensional electron transport pathways, implying ap otential application for environment remediation. Here,w e study the degradation of aromatic organics in advanced oxidation processes (AOPs) by a3 D-MoS 2 sponge loaded with MoS 2 nanospheres and graphene oxide (GO). Exposed Mo 4+ active sites on 3D-MoS 2 can significantly improve the concentration and stability of Fe 2+ in AOPs and keep the Fe 3+ / Fe 2+ in as table dynamic cycle,t hus effectively promoting the activation of H 2 O 2 /peroxymonosulfate (PMS). The degradation rate of organic pollutants in the 3D-MoS 2 system is about 50 times higher than without cocatalyst. After a1 40 Lp ilotscale experiment, it still maintains high efficiency and stable AOPs activity.A fter 16 days of continuous reaction, the 3D-MoS 2 achieves ad egradation rate of 120 mg L À1 antibiotic wastewater up to 97.87 %. The operating cost of treating aton of wastewater is only US$ 0.33, suggesting huge industrial applications.

Almost 100 % Peroxymonosulfate Conversion to Singlet Oxygen on Single‐Atom CoN2+2 Sites

“…2×10 8 M −1 s −1 ) and low activation energy (7.4±2.4 kcal mol −1 ), leading to the generation of S 2 O 8 2− , SO 4 − ions and 1 O 2 [19] . Notably, carbonaceous nanomaterials like N‐doped graphene or carbon nanotubes, could catalyze the self‐decomposition of persulfate regardless of pH values, mediating homogeneous persulfate activation to form 1 O 2 [20] . Because of the carbon support of both Co‐NP and Co‐SA catalysts, the non‐radical generation of 1 O 2 was a spontaneous process in both systems.…”

Almost 100 % Peroxymonosulfate Conversion to Singlet Oxygen on Single‐Atom CoN2+2 Sites

“…[19] Notably, carbonaceous nanomaterials like N-doped graphene or carbon nanotubes, could catalyze the self-decomposition of persulfate regardless of pH values, mediating homogeneous persulfate activation to form 1 O 2 . [20] Because of the carbon support of both Co-NP and Co-SA catalysts, the non-radical generation of 1 O 2 was a spontaneous process in both systems. As a result of the strong adsorption of Co sites on the surface of Co-NP, the O À O bond in HSO 5 À was rapidly cleaved and COH/SO 4 C À were produced by a radical pathway, leading to COH/SO 4 C À and 1 O 2 .…”

Transition Metal and Metal–Nx Codoped MOF‐Derived Fenton‐Like Catalysts: A Comparative Study on Single Atoms and Nanoparticles

“…[12][13][14][15][16] In recent years, the peroxymonosulfate (PMS)-based Fenton-like catalytic oxidation process has been regarded as a clean approach to generating reactive oxygen species (ROS), which presents a promising potential to overcome the ever-growing pollutants in water systems resulted from the toxic benzene-derived compounds. [17][18][19][20][21] However, it is very hard to activate PMS to generate sufficient radicals to degrade water pollutants efficiently, which thus hinders the practical applications of PMS in the Fenton-like oxidation reactions. [22][23][24] To deal with these issues, abundant transition metal-based catalysts have been studied as for PMS-based Fenton-like oxidation reactions, especially the carbon hybrids with elaborated nanostructures, prominent…”