| 掺氮Ta2O5诱发可见光-类Fenton体系降解阿特拉津研究 |
| 摘要点击 1772 全文点击 1337 投稿时间：2011-05-19 修订日期：2011-08-29 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 可见光 类Fenton 掺氮Ta2O5 Fe3+还原 阿特拉津 |
| 英文关键词 visible light Fenton-like system N-doped Ta2O5 Fe3+reduction atrazine |
|
| 中文摘要 |
| 通过制备具有强可见光吸收和活性的半导体掺氮Ta2O5,利用其可见光Fe3+还原活性,实现了可见光-类Fenton体系有效地降解阿特拉津.结果表明,氨气流量0.3 L·min-1、700℃氮化时间6 h制备出的掺氮Ta2O5在可见光下还原Fe3+的能力最佳; 阿特拉津降解效果与各种操作条件——光强、催化剂投加量、Fe3+、H2O2、阿特拉津初始浓度及pH值有关,并通过H2O2的分解揭示影响的原因.在pH为2.6、[atrazine]0=18 mg·L-1、[H2O2]0=2.5 mmol·L-1、[Fe3+]0=0.5 mmol·L-1、掺氮Ta2O5投加量为0.6 g·L-1、500 W氙灯照射下,反应60 min时,阿特拉津的降解率为97%.该研究为可见光-类Fenton体系降解有机污染物的实际应用提供了基础数据和理论指导. |
| 英文摘要 |
| In this study, N-doped Ta2O5 samples which have strong absorption in visible domain, were prepared by the nitridation of Ta2O5 under NH4 flow and then added into photo-Fenton-like system to enhance Fe3+ reduction and atrazine degradation under visible light irradiation. The sample prepared at 700℃ under a NH3 flow rate of 0.3 L·min-1 for 6 h showed the highest level of photocatalytic activity for Fe3+reduction. The influence of various operational parameters such as the light intensity, input of N-doped Ta2O5, pH and initial concentrations of Fe3+, H2O2 and atrazine were investigated. And the changesof H2O2 during the degradation were measured to explain the effect of the operational parameters. The degradation ratio of atrazine reached 97% after 60 min irradiation by 500 W Xe lamp under the conditions of pH=2.6,[atrazine]0=18 mg·L-1, [H2O2]0=2.5 mmol·L-1, [Fe3+]0=0.5 mmol·L-1 and the input of N-doped Ta2O5=0.6 g·L-1. |
|
|
|
