形稳阳极Ti/IrO_2-Ta_2O_5电Fenton法催化降解含酚废水

针对电芬顿(Fenton)降解含酚废水时,铁阳极Fe易溶解从而影响降解效率的问题,采用形稳阳极Ti/IrO_2-Ta_2O_5进行电Fenton降解含酚废水的研究。采用高效液相去谱法推测了Ti/IrO_2-Ta_2O_5阳极和Fe阳极电Fenton降解苯酚的中间产物和降解过程。结果表明,FeSO_4·7H_2O投加量0.1 g·L~(-1),H_2O_2投加量2.94 mmol·L~(-1),初始pH值3.5,电压5.0 V,降解时间2 min,苯酚和化学需氧量(COD)去除率分别达94.14%和40.74%。在相同初始pH值、电压和降解时间下,使用铁阳极,苯酚和COD的去除率分别为40.74%和26.41%。相比Fe阳极电Fenton过程,Ti/IrO_2-Ta_2O_5阳极电Fenton过程降解废水时具有H_2O_2投加量少、降解时间短、电解电压低,并且耗酸量少、处理效果好、电极不易溶解的优点。Ti/IrO_2-Ta_2O_5阳极和Fe阳极电Fenton降解苯酚的过程是相同的,但在相同降解时间内,Ti/IrO_2-Ta_2O_5阳极电Fenton法降解含酚废水效率较高,这是由于Ti/IrO_2-Ta_2O_5阳极电催化反应与Fenton反应形成协同效应,协同降解废水的效率大于单独Fe阳极Fenton反应降解废水的效率。

Degradation of Phenol Wastewater by Electro-Fenton Method with Dimensionally Stable Anode of Ti/IrO2-Ta2O5

Aiming at the problem that in the degradation of phenol wastewater by Electro-Fenton, Fe of Fe anode is easily dissolved, which affects the degradation efficiency, the study on the degradation of phenol wastewater by Electro-Fenton was carried out using ghe dimensionally stable anode of Ti/IrO₂-Ta₂O₅. The degradation intermediate products and degradation process of phenol wastewater of Ti/IrO₂-Ta₂O₅ anode and Fe anode for Fenton degradation of phenol were detected by high performance liquid chromatography(HPLC). Results show that when FeSO₄·7H₂O dosage is 0.1 g·L^-1, H₂O₂ dosage is 2.94 mmoL·L^-1, initial pH is 3.5, voltage is 5 V and degradation time is 2 min, by using Ti/IrO₂-Ta₂O₅ anode, the removal efficiency of phenol and COD can reach 94.14% and 40.74%, respectively. When Fe anode is used, at the same initial pH, voltage and degradation time, the removal efficiencies of phenol and COD are 40.74% and 26.41%, respectively. Compared with the Electro-Fenton process of Fe anode, the Electro-Fenton method of Ti/IrO₂-Ta₂O₅ anode has the advantages of less acid consumption, less H₂O₂ dosage, shorter reaction time, lower electrolysis votage, lower consumption of electrode and better treatment effect for degradating phenol wastewater. The degradation process of phenol wastewater of Ti/IrO₂-Ta₂O₅ anode and Fe anode for Fenton degradation of phenol are the same, but the degradation efficiency of phenol wastewater by Electro-Fenton method with Ti/IrO₂-Ta₂O₅ anode is higher in the same degradation time. This is because the electrocatalysis reaction using Ti/IrO₂-Ta₂O₅ anod and Electro-Fenton reaction can form a synergisic effect, the synergistic degradation of wastewater is more than that of alone Electro-Fenton reaction using Fe anode.