日光/草酸铁络合物/H_2O_2降解水中2,4-二氯苯酚

Study on the Photo-degradation of 2,4-dichlorophenol in Water by Sunlight/ferrioxalate Complexes/H_2O_2

以日光作光源 ,Fenton 草酸铁络合物为光氧化剂 ,对水中 2 ,4 -二氯苯酚进行了光氧化降解试验研究。结果表明 :草酸铁络合物 /H2 O2 光氧化降解 2 ,4 -二氯苯酚的速率显著高于Fenton试剂 ,前者的光解初始速率大约是后者的 4倍 ;溶液 pH值对光氧化有很大影响 ,pH值在 3左右 ,2 ,4 -二氯苯酚的光降解脱氯的效果较佳 ,pH超过 4 ,光降解脱氯效率明显下降 ;在晴天和多云日照下草酸铁络合物 /H2 O2 光氧化降解有机物的速率很快 ,在阴天的光解速率相对较慢 。

The photo-degradation of 2,4-dichlorophenol (2,4-DCP)in water by ferrioxalate complexes /H 2O 2 as photo-oxidant and sunlight as light source was studied. The results show that the photo-degradation rate of 2,4-DCP by ferrioxalate complexes /H 2O 2 system was obviously higher than that achieved by Fenton reagent, the former's degradation rate was about 4 times of the latter's. Solution pH having significant effect on the photo-degradation of 2,4-DCP and the degradation effect was optimal at pH 3. The efficiency of dechlorination was clearly descent as pH larger than 4. The photo-degradation rates were very fast by ferrioxalate /H 2O 2 system in sunny day. Compared with sunny day, the photo-degradation rate in cloudy day is slow, but the efficiency is still very high.