Degradation of phenol using low concentration of ferric ions by the photo-Fenton process
Degradation of phenol using low concentration of ferric ions by the photo-Fenton process
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DOI：
10.1016/j.jtice.2010.01.012
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发表时间：
2010-11
影响因子：
5.7
通讯作者：
Y. Huang;Yu-Jen Huang;H. Tsai;Hung-Ta Chen
中科院分区：
文献类型：
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作者：
Y. Huang;Yu-Jen Huang;H. Tsai;Hung-Ta Chen
在pH为3，5 mg/L Fe(III)，1080 mg/L H_2O_2的条件下，用3盏紫外灯(365 Nm)对苯酚进行光-芬顿降解。在UV/H_2O_2体系中，苯酚的降解效率较低，1h内降解率仅为25%左右。光-Fenton体系的效率远高于UV/H_2O_2和类Fenton体系。光-Fenton法对COD的去除效率可达98%，而类Fenton法仅为63%。考察了草酸盐对苯酚降解的影响。当草酸与铁离子的摩尔比([Ox]/[Fe3+])为2时，苯酚的去除效率最高。增加溶氧量有利于苯酚的降解。即使在光-Fenton体系中铁离子投加量较低的情况下，对COD的去除效果仍然令人满意。苯酚降解过程中的中间有机酸有甲酸、醋酸、草酸和丁二酸。从实验结果和文献中提出了苯酚在光芬顿过程中的降解途径。
In this study, phenol was degraded by the photo-Fenton process at pH 3, 5mg/L Fe(III), 1080mg/L H2O2using 3 UV lamps (365nm). In the UV/H2O2system, the degradation of phenol is inefficient, and only around 25% of the phenol is degraded in 1h. The efficiency of the photo-Fenton system considerably exceeded that in UV/H2O2and Fenton-like systems. The removal efficiency of COD by the photo-Fenton process was 98% respectively, but only 63% in the Fenton-like system. The effect of oxalate on the degradation of phenol was also investigated. The removal efficiency of phenol was highest at a molar concentration ratio of oxalic acid to ferric ions ([Ox]/[Fe3+]) of 2. Increasing the amount of dissolved oxygen promoted the degradation of phenol. Even when concentration of added ferric ions in the photo-Fenton system was low, the COD removal efficiency was still satisfactory. The intermediate organic acids during the degradation of phenol were formic acid, acetic acid, oxalic acid and succinic acid. The pathway of phenol degradation in the photo-Fenton process is proposed from experimental results and the literature.