Fe（Ⅱ）EDTA／H2O2电催化降解甲基橙模拟废水的研究

在无隔膜电解槽中，采用SPR（Ru—Ir—TiO2）为阳极，石墨为阴极，考察了Fe（Ⅱ）EDTA／H2O2电催化降解甲基橙（methylorange）模拟废水的影响，发现EDTA很大程度上促进了类电Fenton试剂对甲基橙模拟废水的降解。实验研究表明，在外加电压为5．0V，EDTA：Fe2＋=2：1（摩尔比，Fe2＋=40mmol／L），H202=48mmot／L，电解质Na2SO4=40mmol／L，废水pH值为（6．5±0．1）的条件下，降解260mg／L的甲基橙模拟废水90min，EDTA的加入可以使甲基橙模拟废水的脱色率由29．5％上升到78．4％，COD由571．429mg／L降至80mg／L，COD的降解率为86％，EDTA在此过程中既是催化剂又是反应物，可有效避免EDTA带来二次环境污染的可能性。

Electro-catalytic degradation of simulated methyl orange wastewater by Fe（Ⅱ ）EDTA/H2O2

The effect of EDTA on the electro-Fenton like reagent was investigated for degrading wastewater simulated with methyl orange, using SPR （Ru-Ir-TiO2） as anode and graphite as cathode in the non-membrane electrolytic cell. The results showed that EDTA promotes discoloration of methyl orange from 29.5% to 78.4% , as compared with that cases without EDTA; and 86% COD removal and 80 mg/L final COD could be achieved under the suitable conditions of pH （6.5 ±0. 1 ） , EDTA to Fe2＋ molar ratio of 2： 1, H202 concentration of 48 mmol/L, electrolyte sodium sulfate of 40.0 mmol/L, electrolytic period 90 min and voltage 5.0 V respectively. EDTA played the roles of both catalyst and reactant, which effectively avoided offering extra environmental con- tamination.