Removal Of Bisphenol AF From Water By Zero-valent Metal Iron And Copper Enhanced Potassium Ferrate

Due to the limitation of bisphenol A?BPA?in recent years,bisphenol AF?BPAF?has been widely used as a substitute for BPA in industrial fields such as fluororubber and polyester processing to enhance the properties of products?thermal stability,resistance flammability,environmental stability,etc.?to ensure product quality.As an endocrine disrupting substance,BPAF causing a great threat to the health and life of living things and humans.As the growth applications,BPAF can be detected in the environment?water,river sediment,sludge,etc.?and biological samples.Therefore,it is urgent to remove BPAF in a effective way.Ferrate?VI?is an environmentally friendly water treatment oxidizing agent that integrates multiple functions.When it treats toxic and harmful substances that are difficult to degrade in water alone,it is affected by other side reactions,and its true utilization efficiency is not ideal,resulting in unreasonable consumption of the medicament and waste of time.Therefore,the research on strengthening the ferrate oxidation ability has become a research hotspot of ferrate treatment technology in recent years.Zero-valent copper and zero-valent iron have a large reserve on the earth and have strong reducing power.Therefore,in order to improve the removal efficiency of BPAF in this study,more intermediate valence irons?IV and V?with stronger oxidizing power are produced in the reaction system by adding zero-valent copper and zero-valent iron to the ferrate oxidation system.The main studies is as follows:?1?In pure water,the influence of ferrate dosage,zero-valent copper?ZVC?dosage,zero-valent iron?ZVI?dosage,reaction temperature,initial pH value,inorganic anions(NO₃^-,SO₄^2-,Cl^-,CO₃^2-/HCO₃^-)and fulvic acid for the degradation of BPAF by ferrate/ZVI system and ferrate/ZVC system were investigated.The results show that the degradation of BPAF by the oxidation system follows the pseudo first-order reaction kinetics.The BPAF removal rate and the apparent pseudo first-order reaction rate constant increase with the increase of ferrate dosage and reaction temperature,and with the increase of ZVC and ZVI dosage,there is a change that first increases and then decreases.The change of the initial pH significantly affects the oxidation capacity of ferrate,the presence of ferrate and its interaction with ZVC and ZVI.Inorganic anions such as NO₃^-,SO₄^2-,Cl^-,CO₃^2-/HCO₃^-will affect the oxidation system by affecting the decomposition of ferrate,the existence form of ZVC and ZVI and capture HO·in the reaction system.The presence of fulvic acid inhibits the degradation efficiency of BPAF by competing with BPAF.?2?In natural water,the influence of ferrate dosage,ZVC dosage,ZVI dosage,reaction temperature,initial pH value were investigated.The results show that the effect of reaction temperature and ferrate dosage are consistent with the phenomenon when it was in pure water.The intensity of the fluorescent substance in the water sample before and after the reaction and the change of UV₂₅₄54 were detected by three-dimensional fluorescence and ultraviolet-visible spectrophotometer respectively.The results show that the reason that the removal efficiency of BPAF in natural waters is lower,and the optimal dosage of ZVC and ZVI was smaller than that of pure water is mainly due to the protein-like substance containing the aromatic ring structure and the fulvic acid-like substance present in the natural water body preferentially react with the ferrate,and the ferrate in the solution was consumed.