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以活性炭纤维为阴极、RuO2/Ti网为阳极、Na2SO4为支持电解质的电化学体系为研究对象,研究了电流强度、pH值和溶解氧含量等主要参数对电化学体系产生H2O2的影响.结果显示,在电流强度0.12～0.50 A范围内,H2O2的生成量随着电流强度增大而升高,反应60 min后,H2O2浓度可达稳定值;电化学体系具有较宽泛的pH范围,初始pH在2.0～6.0时活性炭纤维阴极产生的H2O2均高于500μmol.L-1,pH 2.0时H2O2生成量最大,可达575.8μmol.L-1;体系中溶解氧浓度影响H2O2的电化学生成量,溶解氧浓度越高H2O2生成量越大;无背景气体通入时,电化学体系自身产生的溶解氧可以支持活性炭纤维阴极产生高浓度的H2O2.研究结果表明具有高比表面积的活性炭纤维电极是一种高效的电-Fenton阴极.
The electrochemical system of activated carbon fiber as cathode, RuO2 / Ti mesh as anode and Na2SO4 as supporting electrolyte was studied to study the influence of main parameters such as amperage, pH value and dissolved oxygen content on H2O2 produced by electrochemical system.The results showed that , The current density of 0.12 ~ 0.50 A range, the formation of H2O2 increased with the current intensity increases, the reaction after 60 min, H2O2 concentration up to a stable value; electrochemical system has a broader pH range, the initial pH at The H2O2 produced by the cathode of activated carbon fiber was higher than 500μmol.L-1 at 2.0-6.0. The maximum H2O2 production reached 575.8μmol.L-1 at pH 2.0. The dissolved oxygen concentration in the system affected the electrochemical production of H2O2, The higher the oxygen concentration, the greater the amount of H2O2 generated. Without the introduction of background gas, the dissolved oxygen produced by the electrochemical system can support the high concentration of H2O2 on the cathode of the activated carbon fiber. The results show that the activated carbon fiber electrode with a high specific surface area is a Efficient electro-Fenton cathode.