Abstract: To study anode effect on electro-Fenton reaction,three kinds of electrode,including SnO₂/Ti electrode with nanocoating(DSA),activated carbon fiber(ACF)and graphite paper(GE)were combined to form three electrode couples,and they were applied to degrade activated brilliant red X3B. The order of decoloration and mineralization rate for these various electrode couples are as follows:a(cathode/ACF,anode/DSA)>b(cathode/ACF,anode/GE)>c(cathode/GE,anode/DSA).Under the optimum conditions,for electrode couple a,X3B was decolored completely in 90 min,mineralization rate and average current efficiency(ACE)in 180 min were 75.3% and 56.7% respectively.XRD and SEM images implied that structure of ACF and DSA were stable for electro-Fenton reaction conditions.The CV curves of electrodes suggested that the direct anodic oxidation was not involved in electro-Fenton system.The flurosence method was used to detect oxidation activity species,the results indicated that result of X3B degradation was in proportional to amount of hydroxyl radical formed.The study demonstrated that DSA can enhance efficiency of electro-Fenton reaction by a pathway activating H₂O₂ to hydroxyl radical.

Key words: electrodes, electro-Fenton, ACF, DSA, dye

摘要： 以钛基氧化锡纳米涂层(DSA)电极作为阳极,以活性炭纤维(ACF)作为阴极,与石墨板(GE)电极进行组合,形成三组不同的电极对,用于比较研究电芬顿反应中的阳极影响因素。降解模拟染料活性艳红X3B,其脱色率和矿化率均为:电极体系a(阴极/ACF,阳极/DSA)>b(阴极/ACF,阳极/GE)>c(阴极/GE,阳极/DSA)。其中最优电极体系a反应90 min完全脱色,180 min内矿化率和平均电流效率分别为75.3% 和56.7%。XRD和SEM表征表明:DSA电极和ACF电极在电芬顿反应中具有稳定的化学结构。循环伏安扫描的结果表明三组电极体系均无明显的阳极直接氧化反应发生。采用荧光法检测了活性氧化物种,发现三组电极体系生成羟基自由基的数量与其降解效果完全一致。本研究证明DSA 对于电芬顿反应有促进作用,并且这一促进作用是通过催化H₂O₂生成·OH 这一间接途径来实现的。

关键词: 电极, 电芬顿, 活性炭纤维, DSA电极, 染料