偏电压对Ti／TiO_2光电催化氧化富里酸的影响

POTENTIAL BIAS ON THE PHOTOELECTROCATALYTIC DEGRADATION OF FULVIC ACID

采用光电催化反应器对水中天然有机物富里酸(FA)进行降解试验,考察了外加阳极偏电压对光电催化反应器降解富里酸的影响．结果表明,当外加电压为1．2V时,具有最佳的UV254和有机碳TOC去除率,当反应时间为2h时,富里酸的UV254和总有机碳TOC的去除率分别为77．4％和45．4％．另外,在反应初期(前1h内)富里酸光电催化反应动力学常数主要受外加偏电压的影响．

A new photoelectrocatalytic reactor was adopted to investigate the external anodic potential affecting the degradation of natural organic matter-fulvic acid. The results showed that the remove of UV254 and TOC reached maximum while the electrical bias applied is 1.2V. The remove of UVE54and TOC is 77.4% and 45.4% respectively after reacting two hours. Experimental results indicated that the kinetic of degradation of natural organic matter-fulvic acid by photoelectrocatalytic reactor was highly effeeted by electrical bias applied at early reaction （before an hour）.