| 可见光照射下土壤光催化降解有毒有机污染物 |
| 摘要点击 1361 全文点击 2010 投稿时间：2008-07-16 修订日期：2008-11-28 |
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| 中文关键词 土壤 光催化 异相类Fenton 酸性桃红 |
| 英文关键词 soil photo catalytic heterogeneous Fenton like Sulforhodamine B(SRB) |
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| 中文摘要 |
| 在可见光（vis，λ＞420 nm）照射下，用天然土壤粉末（Soil）做催化剂降解酸性桃红（Sulforhodamine B，SRB）和2，4 二氯苯酚(2，4- Dichlorophenol，DCP)，分析了催化剂的用量、H2O2初始浓度对降解反应的影响，并通过紫外 可见分光光度法(UV-Vis)、荧光检测（FL）、红外光谱（IR）等方法对降解反应动力学及反应机制进行了研究.结果表明，Soil/H2O2/vis体系能有效地降解SRB，反应240 min可脱色完全，10 h COD去除率达90.44%，反应240 min，DCP的去除率达到80.55%；荧光检测发现反应中产生了高活性氧化物种·OH，红外光谱结果表明目标底物最终被氧化降解为胺类、羧酸类小分子；催化剂具有比较好的稳定性，循环使用5次，催化性能无明显变化.反应机制主要是涉及·OH的异相类Fenton过程. |
| 英文摘要 |
| Natural Soil was used as catalyst to degrade Sulforhodamine B(SRB) and 2，4 Dichlorophenol(DCP) under visible irradiation (vis，λ>420 nm). The influences of［Soil］ and［H2O2］0 on degradation were analysed，and the reaction kinetics and mechanism of degradation were studied by UV Vis，fluorescence spectra and IR. Results indicated，SRB can be degraded availably by chosen Soil/ H2O2/vis system. Depigmentation can complete in 240 min，COD was removed by 90.44% in 10 h，and DCP was removed by 80.55% in 240min. Fluorescence spectra results show that highly active oxide species ·OH was produced in the reaction. IR results indicate SRB was degraded to small molecular，such as amine substances and carbonyl compounds. Catalyst activity did not exhibit any significant loss after used 5 recycles. Degradation mechanism is heterogeneous Fenton like process related with ·OH. |
