Preparation Of Cobalt-Copper Bimetal And Its Activation Mechanism To Sodium Persulfate

Persistent organic pollutants?POPs?are a general term for pollutants that are stable in the environment for a long time and are harmful to human health and the environment.PCB₁₅₃ and DBP are typical POPs that are widely distributed in the environment with stability,bioaccumulation,remote mobility and Carcinogenic effects.Traditional oxidation methods are difficult to completely mineralize persistent organic pollutants,such as incineration,which can easily produce toxic secondary pollutants such as dioxins.Physical solidification,adsorption and landfill methods do not reduce the POPs themselves,and there is a potential for leakage.Therefore,the use of advanced oxidation technology to treat POPs pollutants,which can effectively mineralize pollutants,is currently the most valuable technology for the treatment of POPs.Therefore,in this paper,dibutyl phthalate?DBP?and hexachlorobiphenyl(PCB₁₅₃)were studied in this paper.The persistent organic pollution of cobalt-copper-bimetallic activated sodium persulfate system under different conditions was developed and studied.The removal condition of the object.Through the modern characterization method and the theoretical analysis of free radicals,the activation mechanism of cobalt-copper bimetal to sodium persulfate was deduced.The synergistic effect of cobalt-copper bimetal was expounded,which provided a theoretical basis for bimetallic activation.The main findings are as follows:1.The development of sea urchin-like CoCu bimetallic materials with high specific surface area was explored and used as a catalyst for SPS to study the degradation mechanism of DBP in water.It was found that when the condition was SPS=2mM,the catalyst was 2.0 g/L,and the degradation rate of DBP was about 90%when reacted for10 minutes.The activation mechanism was revealed by various characterization methods of the catalyst before and after the free radical trapping experiment and the radical quenching reaction.The main activation mechanism of CoCu bimetal to SPS is:Co²⁺and Cu⁰,Cu²⁺transfer electrons to sodium persulfate to form sulfate radicals,and electrons transfer between CoCu ions,which produces a certain synergistic effect.2.The degradation mechanism and influencing factors of PCB₁₅₃ in the soil were investigated by using CoCu-CN as catalyst and sodium persulfate?SPS?as oxidant.The oxidation mechanism was revealed.The results show that CoCu-CN can effectively catalyze SPS,and the degradation rate of PCB₁₅₃ reaches 80%after 30 minutes.Cl^-or HCO₃^-inhibits the oxidation performance of the system,and inhibition increases as the concentration of Cl^-or HCO₃^-increases.X-ray photoelectron spectroscopy?XPS?characterization and quenching free radical reaction indicate that Cu⁰ and Co²⁺are the main substances that activate SPS in CoCu-CN/SPS system,and SO₄·-and·OH are the two most active substances.3.A CoCu bimetallic material was prepared by a simple coprecipitation method.The synergistic effect of CoCu was explored by BET,XPS,quenching reaction and free radical trapping EPR experiments.