| 赤铁矿光助类Fenton降解有毒有机污染物 |
| 摘要点击 2664 全文点击 1440 投稿时间：2011-06-06 修订日期：2011-07-06 |
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| 中文关键词 赤铁矿 光催化 异相类Fenton 羟基自由基 矿化 |
| 英文关键词 hematite photo-catalytic heterogeneous Fenton-like hydroxyl radical mineralization |
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| 中文摘要 |
| 可见光照射下(λ>420 nm)采用天然赤铁矿为催化剂降解罗丹明B(rhodamine B,RhB)和无色小分子2,4-二氯苯酚(2,4-dichlorophenol,DCP),探讨了溶液pH、催化剂用量、溶液中溶铁量对降解反应的影响,通过紫外-可见分光光度计、红外光谱仪、苯甲酸荧光光度法以及COD等跟踪降解过程,并对反应机制做了初步探讨.结果表明,Cata/RhB/H2O2/vis体系能有效地降解RhB,降解最佳条件为:催化剂用量0.6 g·L-1、pH为3.0、H2O2浓度1.5×10-3 mol·L-1,反应180 min可完全脱色,且溶铁对催化体系的贡献较小; 对2,4-DCP的降解,24 h后,降解率达56%.且该催化剂具有良好的稳定性,循环使用6次,催化剂活性无明显变化.苯甲酸荧光光度法检测到反应体系中产生了高活性氧化物种·OH,反应机制主要是·OH的异相类Fenton过程. |
| 英文摘要 |
| Hematite was used as the catalyst to degrade the rhodamine B and 2,4-dichlorophenol under visible light irradiation. The effect of pH, catalyst dosage and dissolved iron on the degradation efficiency were studied. UV-Vis spectrophotometer, infrared spectrometer, fluorescence spectrophotometry and the chemical oxygen demand (COD) were employed to evaluate the mechanism during the degradation process. The result indicated that RhB could be degraded effectively by the Cata/RhB/H2O2/vis system. The optimum conditions were 0.6 g·L-1 catalyst; pH 3.0 and 1.5×10-3 mol·L-1 H2O2. RhB was decomposed after 180 min and 56% of 2,4-DCP was degraded after 24 h by this syetem. Dissolved Fe ion was a relatively weak factor for the catalyst system. The catalyst had excellent stability with little loss of activity after 6 recycling experiments. The degradation process was dominated by the hydroxyl radical (·OH) generated in the heterogeneous Fenton-like system. |
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