CoFe2O4 with MoS2-xOy Nanosheets as a Co-catalyst for Enhanced Activation of Peroxydisulfate in Advanced Oxidation Processes |
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Authors: | Shumin Du Guanyu Zhao Runmeng Zhang Prof Xuzhen Wang Prof Zongbin Zhao Prof Jieshan Qiu |
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Institution: | 1. School of Chemistry, Liaoning Key Lab for Energy Materials and Chemical Engineering, Dalian University of Technology, Dalian, 116023 P. R. China;2. School of Chemical Engineering, Liaoning Key Lab for Energy Materials and Chemical Engineering, Dalian University of Technology, Dalian, 116023 P. R. China;3. College of Chemical Engineering, State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 P. R. China |
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Abstract: | The application of advanced oxidation processes (AOPs) based on sulfate radicals for degrading persistent organic pollutants faces challenges due to the inefficient activation of peroxydisulfate (PDS) oxidant. Herein, a composite CoFe2O4/MoS2-xOy (CFM) catalyst consisting of CoFe2O4 nanoparticles uniformly dispersed on the nanosheets of oxygen-incorporated MoS2 (MoS2-xOy) with flower-like morphology are fabricated through a facile two-step hydrothermal method, which results in the enhanced activation of PDS and a highly efficient degradation of phenolic pollutants. The oxygen-doping in MoS2-xOy leads to unsaturated sulfur and active sites on the surface of MoS2 for accelerating the rate limiting step of FeIII/FeII reduction cycle in PDS-CFM reaction. Aiming at the refractory organic pollutants in actual coking wastewater, CFM co-catalyst is introduced into a hydrogel made up of polyvinyl alcohol (PVA) and coal-tar pitch oxides (PO) to construct a multifunctional CFM@PO/PVA hydrogel. Upon hybrid CFM@PO/PVA, the coupling of the enhanced AOP with solar-driven interfacial vapor generation (SIVG) technology contributes to the degradation efficiency, the removal rate of phenol in solution and the total organic carbon in coking wastewater can reach 98 % and 91 %, respectively. The integration of heterogeneous AOPs with SIVG system provides a feasible strategy for the eco-friendly efficient purification of industrial wastewater. |
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Keywords: | Advanced oxidation Peroxydisulfate CoFe2O4 Oxygen-incorporated MoS2 Hybrid hydrogel |
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