Preparation Of New Coating Anode And Electrocatalytic Oxidation Treatment Of Phenol Containing Wastewater

Phenol is a kind of archetypal toxic organic substance which is toxic to all biological individuals.With the requirement of environmental quality,the treatment of phenol containing wastewater tends to be green and harmless.Electrocatalytic oxidation technology does not add any chemicals in the treatment process,It has the advantages of small harm to the environment and simple operation and so on.So it is favored by the sewage treatment industry.Anode is an important part of electrocatalytic oxidation technology.It has a great influence effect on the degradation.The coating anode has the advantages of low working voltage,no pollution and no good electrocatalytic performance.Therefore,it has become a research hotspot in the degradation of phenol wastewater.This paper compares the noble metal coated anode?ruthenium iridium coating?and tin antimony coated anode.We used Ru-Ir coating electrode or Sn-Sb coated electrode as anode and titanium plate as cathode.10 g/L Na₂SO₄ is added to the solution as an electrolyte,It began to degrade the simulated water solution containing 100 mg/L phenol.At the same time,enhanced life test and electrochemical performance test were carried out.The experimental results show that the optinal preparation condition of Sn-Sb electrodes was that:the sintering temperature and and the ratio of Sn to Sb were 550?and from 100:8 to 100:20.The Sn-Sb anode with a Sn sb ratio of Sn:Sb=10:8 to 100:20?molar ration?has higher oxygen evolution potential and the best degradation effect.The maximum removal rate of COD_cr in phenol solution can reach 43.08%.The maximum intensifying life is 3.73 h?0.1 A/cm²??Different proportions of Ni and Cu were added to the coating.The experimental results show that,When using Sn-Sb-Cu?Sn:Sb:Cu=10:8:8??molar ration?as the anode,the stimulant phenolic wastewater?that contains 100 mg/L phenol?was degraded in a electrolytic cell,and the COD_cr removal rate reached the maximum of46.06%.The experimental results show that,the optimal preparaion condition of Sn-Sb-Cu?100:8:8?electrodes was that:Drying at 160?for 10 minutes,550?for 15minutes,After coating 15 times,Sintering at 600?for 1 hours,and natural cooling with furnace.Using this electrodes degradedphenol wastewater?100 mg/L phenol?,The maximum removal rate of COD_cr in phenol solution can reach80.64%,The maximum intensifying life is 22 h?0.1 A/cm²?.In order to further improve the service life of the anode,Mn?Ir?Ru?T which have been prepared by anodization as the intermediate layers of Sn-Sb-Cu electrode was explored,it was found that T-intermediate layers could increase service lifetime from 22 h?0.1 A/cm²?to 43 h?0.1 A/cm²?,the COD_cr removal ratewas increased from 80.64%to 81.51%.Furthermore,factors influenceing phencing phenol degration,such as electrolysis time,pH values,original phenol concentration,Electrolyte and electrolysis temperature were investigated in the system with cathode of the Sn-Sb-Cu anode.The experimental results show that,current intensity of 30mA/cm² and concenttration of Na₂SO₄?10 g/L?and NaCl?2 g/L?were taken as the optimum conditions.After two hours,a COD_cr removal rate of 100%,groove pressure is stabily in degradation process.Finally,industrial phenolic wastewater was degraded with optimum electrolysis and optimum process in the Experiment.The results show,phenolic organic wastewater with a COD_cr content of 741 mg/L was degraded for 2 hours,a COD_cr removal rate of 94.4%,It has good removal effect,long service life,and is expected to be applied in industrial wastewater treatment.