摘要
在无隔膜电解槽中,采用SPR(Ru-Ir-Ti02)为阳极,石墨为阴极,考察了Fe(Ⅱ)EDTA/H2O2电催化降解甲基橙(methyl orange)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5.0 V,EDTA∶Fe2+=2∶1(摩尔比,Fe2+=40 mmol/L),H2O2=48 mmol/L,电解质Na2SO4=40 mmol/L,废水pH值为(6.5±0.1)的条件下,降解260 mg/L的甲基橙模拟废水90 min,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571.429 mg/L降至80 mg/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。
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.
出处
《环境工程学报》
CAS
CSCD
北大核心
2010年第4期833-838,共6页
Chinese Journal of Environmental Engineering
