ACF阳极氧化法去除水中腐殖酸的研究

Study on electro-oxidation removal of humic acid in water with ACF anode

以活性炭纤维毡为阳极,不锈钢片为阴极,采用电化学氧化法处理了含腐殖酸的水溶液。结果显示,该方法可有效去除水中的腐殖酸,对于初始浓度为50mg/L的腐殖酸溶液,在适宜条件下电解120min后,腐殖酸和COD去除率可分别高达93.81%和92.60%。实验考察了溶液pH值、电流密度、支持电解质浓度、腐殖酸的初始浓度和阳极材料的结构等因素对腐殖酸去除率的影响。结果发现,腐殖酸的去除率随电流密度和Na2SO4浓度的增加先增大后基本不变,随溶液的pH值和腐殖酸的初始浓度的增大而减小,阳极材料的比表面积和中孔率与腐殖酸的去除率并不成正比,比表面积适中而电化学性能较好的阳极有利于腐殖酸的电氧化去除。

In this paper,the aqueous solution containing humic acid（HA） was electrochemically oxidized using an activated carbon fiber（ACF） felt as an anode.The results showed that HA can be effectively removed from water.Under suitable condition,the removal ratios of HA and COD can be up to 93.81% and 92.60%,respectively after 120min of electrolysis.The influence of initial pH,current density,Na2SO4 concentration,initial concentration of HA and anode structure on the removal ratio of HA was investigated.The results indicated that the removal ratio of HA increases firstly and then almost invariant with the increase of current density and Na2SO4 concentration,and decreases with the increase of initial pH and initial concentration of HA;the specific surface area and the mesopore percentage of anode material are not in direct proportion to the removal ratio of HA,and the anode with moderate specific surface area and good electrochemistry performance is beneficial to the electro-oxidation removal of HA.