Phenols And Quinones Enhanced The Oxidation Of Organic Compounds By Cu/H₂O₂ System

In recent years,due to the limitation of iron ion circulation in Fenton and Fenton-like reactions,it is difficult to apply in practical engineering,and considering that Cu/H2O2 has a wider pH range than Fe/H2O2 system,and the copper activity is higher than the iron in the neutral condition,researching Cu/H₂O₂ system oxidation degradation organic matter has the important theory guidance significance.Aiming at the problem of the Cu/H₂O₂ system's current target removal and inefficiency,this paper studies the removal effect of organic compounds by adding phenols and quinone enhanced Cu/H₂O₂ system,investigates the influence of some influencing factors,analyzes the degradation pathway of organic matter in the reaction and speculates its reaction mechanism.Three organic compounds were selected as target pollutants,phenolic substances?phenol?,pesticides?atrazine?and new pollutants?triclosan?.The effect of oxidative degradation target in Cu/H₂O₂ system under different conditions(pH value,initial Cu²⁺concentration and initial H₂O₂ concentration)were studied,the results showed that the oxidation degradation of organic compounds was affected by pH,and the degradation rate of organic compounds was the fastest in neutral condition.At the same time,the decomposition rate of H₂O₂ is very fast in alkaline condition,but the degradation of organic matter is slower than the corresponding acceleration,which is mainly due to the ineffective H₂O₂ of oxygen and water,and does not produce strongly oxidizing active substances to oxidize and degrade the target organics.The effects of four ligands?hydroquinone,catechol,resorcinol and hydroquinone?on the oxidative degradation target of Cu/H₂O₂ system were studied.The results showed that the effect of the action was greatly influenced by pH value.Under the acidic and neutral conditions,the Cu/H₂O₂ system can be significantly enhanced to oxidize and degrade organics,and the order of strengthening action from big to small is:hydroquinone,resorcinol and catechol,and the degradation of pollutant is inhibited slightly in alkaline condition.A high resolution flight time Liquid mass spectrometer?AB SCIEX Q-TOF500r?was used to detect and analyze the degradation of atrazine by phenol/quinone enhanced Cu/H₂O₂ System.Through the free radical capture experiment,the sulfoxide method and the ratio analysis reaction system of ATZ product DEA/DIA,it was proved that the reactive species in the system were not high valence copper but hydroxyl radicals.