Effect of modified carbon electrode material on removal of COD from landfill leachate by electro Fenton
Electro Fenton advanced oxidation technology can effectively remove hard-degradable organic pollutants from wastewater,and its performance highly depends on electrode materials.Carbon electrode materials are widely used due to their obvious advantages such as low cost,oxidation resistance,corrosion resistance,good conductivity,safety and non-toxicity.However,there are also problems such as uneven surface reaction activity,low initial coulomb efficiency,and insufficient rate performance,which need to be modified.Three types of car-bon electrode materials,including graphite felt,graphite plate,and carbon sponge,were optimized for single or composite modification using microwave and acid-base solutions.The results showed that under external voltage of 8 V,electrode spacing of 3 cm,initial pH value of 3,and temperature of 25 ℃,the comprehensive perfor-mance of graphite felt was the best among the three carbon electrode materials without modification,the optimal COD removal rate and H2O2 production were 75.95％and 14.33 mg/L,respectively.When conducting single modification and microwave combined composite modification on graphite felt,the performance of composite modification was superior to that of the single modification.Among them,the"microwave+KOH"composite modification method was the optimal method,the modified graphite felt prepared using this optimal method was used as electrode material for the electric Fenton reaction,and its optimal COD removal rate and H2O2 generation rate when treating landfill leachate were 88.95％and 23.99 mg/L,respectively.The results of the electrode stability test showed that,composite modified graphite felt had good reusability as an electrode material.
万方数据
维普
