Catalytic Degradation Of Typical Organic Pollutants By Spent Ternary Battery Anode Materials

With the advancement of science and technology and the improvement of people's living standards,people's demand for new energy sources is increasing.Therefore,more and more electronic products are being produced,and the amount of lithium-ion batteries is increasing.Since these spent lithium ion battery cathode materials contain many transition metals,they are widely used in advanced oxidation technology of wastewater treatment.Therefore,this thesis takes the waste ternary power battery cathode material as the research target,and takes the organic pollutants in the wastewater as the research object,and carries out the following two aspects:?1?In this experiment,bisphenol A?BPA?was used as a model pollutant,and the research on the inorganic wastewater containing SO₂?using NaHSO₃,hereinafter referred to as S?IV??was activated using the waste ternary power battery cathode material.In this study,the effects of initial pH,amount of catalyst,S?IV?concentration and substrate concentration on degradation of BPA were investigated.The results showed that BPA was at initial pH of 5.0and S?IV?at a reaction temperature of 30°C.When the initial concentration is 0.3 mM,when the initial concentration of ternary material is 0.2 mg/L,there is a 70%degradation effect in120 min;in the actual wastewater,the hardness of bicarbonate,water and natural organic pollutants are investigated.The effect on degradation was found.With the increasing concentration of HCO₃^-,Ca²⁺,Mg²⁺ions and HA,the degradation effect of organic pollutants was more and more obvious,and the inhibition effect was gradually enhanced.X-ray photoelectron spectroscopy analysis of the cathode material of waste ternary power battery before and after the reaction showed that the atoms such as Co and Mn contained on the catalyst surface acted as the main active sites.Through free radical quenching experiments,it was proved that the free radical species that play a major role in the reaction process are SO₄^·-and O₂^·-.Through the study of different organic pollutants and dyes,it was found that this reaction system also has a good degradation effect.Finally,through the summary of all the above studies,the main mechanism of the reaction system is proposed,which mainly relies on the surface metal elements of the cathode material of waste ternary power battery and the active oxygen on the surface of HSO₃^-and catalyst materials.?2?In this experiment,4-chlorophenol?4-CP?was used as a model pollutant to carry out research on the activation of monoperoxyhydrogen hydrogensulfate?PMS?with waste ternary power battery cathode material to realize the degradation of organic pollutants in wastewater.The recycling of waste ternary power battery materials has great economic value.In this study,the effects of initial pH,amount of catalyst,concentration of PMS and substrate concentration on degradation of 4-CP were investigated.The results showed that the reaction temperature was 30°C,the initial pH was 9.0,and the initial concentration of ternary material was 0.2 mg.At/L,the initial concentration of PMS is 0.3 mM,and when the concentration of 4-CP is 5mg/L,there is nearly 100%degradation effect within 70 min.While examining the hardness of bicarbonate and water present in the actual wastewater,When the conditions of natural organic pollutants and other factors affect the degradation,it is found that with the increasing concentration of HCO₃^-,Ca²⁺,Mg²⁺ions and HA,the degradation effect of 4-CP is more and more obvious,and the inhibition effect is gradually enhanced.X-ray photoelectron spectroscopy analysis of the cathode material of waste ternary power battery before and after the reaction showed that the metal elements such as Co,Ni and Mn contained on the catalyst surface acted as the main active sites for catalytic activation of PMS.Through free radical quenching experiments,it was found that active radicals such as·OH,SO₄^·-,¹O₂ and O₂^·-existed in the reaction system,but ¹O₂ and O₂^·-played a major role in the reaction system.Finally,the mechanism of the reaction system can be inferred from all the above studies,that is,the metal elements such as Co,Ni,Mn on the surface of the cathode material of the waste ternary power battery react with the active oxygen on the surface of HSO₅^-and the catalyst material respectively,and generate a series of participation.Degradation of 4-CP active free radicals.