Preparation Of MoS₂/CoFe₂O₄ Nanomaterials And Study On Its Efficiency Of Activated Persulfate

China is a country with a per capita shortage of fresh water resources.It faces a series of pollution problems while the per capita possession is scarce.Therefore,research on water treatment methods is an important way to alleviate China's water resources problems.Among a series of water treatment technologies,the process of oxidative degradation of organics in water by persulfate oxidation has attracted widespread attention from scholars at home and abroad due to its advantages such as good recycling effect,long life cycle of active species,and strong oxidation ability.The purpose of this paper is to synthesize MoS₂/CoFe₂O₄ composites by simple,quick and easy operation,and put them into the persulfate oxidation system to explore its mechanism of activating persulfate and the path of degradation of pollutants in water.In this paper,a series of MoS₂/CoFe₂O₄ composites were prepared by hydrothermal method and characterized by SEM,TEM,XRD,FTIR,BET,Zeta potential and XPS.First,using dimethyl phthalate?DMP?as the target pollutant,the activation performance of different activators was explored,and the composite material with the best activation performance when the mass ratio of MoS₂ and Co Fe₂O₄ was 3:1 was selected.Secondly,the M/C-3 composite material with the best activation performance was put into the persulfate system.From the experimental effect and kinetic analysis,the response surface method was used to select the combination of experimental conditions with excellent degradation efficiency and high economic efficiency: The PMS initial concentration was 80?M,the dosage of activator was 100mg/L,and the dosage of DMP was 4?M.Then,the effects of degradation on the degradation efficiency were explored by changing various factors in the experiment.The experiments found that the higher the temperature,the greater the DMP removal rate;when the p H increased from 3 to 5,the degradation efficiency increased,and when the p H increased from 5 to 9,the degradation efficiency decreased;with Cl^-,Ca²⁺,Mg²⁺ and HCO₃^- Increase in concentration will inhibit the degradation effect of DMP to a certain extent;as the concentration of natural humic acid increases,the degradation effect of DMP will become worse.Electron paramagnetic resonance technology was used to directly detect the hydroxyl species?·OH?and sulfate radicals(SO₄^·–)of the active species in the system,and through competitive reaction experiments,it was concluded that SO₄^·– is the main oxidative degradation of DMP in water The active species further speculate the mechanism of SO₄^·– induced by activated persulfate.In addition,this study also found that the presence of the activator promoted the degree of mineralization of TOC in the system,and the mass spectrometry was used to detect the intermediates throughout the degradation process,and a possible reaction path was successfully deduced.