Graphene Oxide-Supported Three-Dimensional Cobalt–Nickel Bimetallic Sponge-Mediated Peroxymonosulfate Activation for Phenol Degradation

Abstract

Advanced oxidation processes (AOPs) based on peroxymonosulfate (PMS) have been effective techniques for wastewater treatment. However, the recovery of powder catalysts and their granulation are limiting the application of heterogeneous AOPs technology. To tackle these issues, recoverable graphene oxide-based three-dimensional (3D) cobalt−nickel bimetallic sponges (SCNGs) were synthesized via a simple dipping process. Thermogravimetric analysis confirmed that the bimetal content of SCNGs was only 7.7%. The SCNGs/PMS system was proved to be greatly effective to treat various organic pollutants, achieving over 71% and 94% of degradation efficiency for phenolic substances (phenol and 4-chlorophenol) and antibiotics (tetracycline and sulfadiazine) in 5 min over a wide initial pH range of 4.0−9.0, respectively. The correlative quenching experiments and electronic paramagnetic resonance tests verified the existence of multiple reactive oxygen species ( 1 O 2 , SO 4•− , HO • , and O 2 •− ), whereas 1 O 2 that originated from PMS self-decomposition and O 2•− conversion played the most important role in the degradation processes. Overall, this study provides a prospect for the industrial application of 3D bimetallic materials based on PMS activation in wastewater treatment.

Generating dual-active species by triple-atom sites through peroxymonosulfate activation for treating micropollutants in complex water

“…XPS survey spectrum confirms the existence of C, O, Bi, and Co elements in Co-BOC ( SI Appendix, Figs. S7 and S8 ) ( 14 , 24 , 29 ). The high-resolution XPS spectra of Co 2p exhibit peaks at 779.8 and 781.2 eV, corresponding to Co 3+ and Co 2+ ( 14 ), respectively, implying that Co may be substituting for Bi in the lattice ( SI Appendix , Fig.…”

“…In order to promote heterogeneous PMS activation with simultaneous generation of free and nonfree radicals, several efficient strategies have been used, such as single-atom modifications ( 10 – 12 ) and heterojunction engineering ( 13 – 15 ). Single-atom catalysts present many unique advantages, such as homogeneous active site structure, maximum metal atom utilization efficiency, uniquely high activity, and the ability to bridge homogeneous and multiphase.…”

MnO2 Nanosheet Nets on Carbon Fiber as Fixed Catalysts for a Highly Efficient, Nonradical Fenton-like Process in Wastewater Refractory Pollutant Treatment

“…Moreover, the removal ratios of TOC were above 67% for all these organic pollutants after 2 h of operation. The variation in removal ratios can be attributed to the different molecular structures of these pollutants (Figure S8), which can influence the complexity of their oxidation. , …”

Rapid Laser-Induced Highly Dispersed and Ultrafine N-Doped Graphene-Wrapped FeCo2O4 Nanoparticles for Nearly 100% Utilization and Conversion of Peroxymonosulfate into Singlet Oxygen

“…36 (3) The catalyst transfers the electrons to PMS, thus pushing the self-decomposition of PMS to produce 1 O 2 (eq 7). 51,52 Pathway 1:…”