| 生物合成施氏矿物作为类芬顿反应催化剂降解甲基橙的研究 |
| 摘要点击 2976 全文点击 1578 投稿时间：2014-09-18 修订日期：2014-10-29 |
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| 中文关键词 降解 甲基橙 施氏矿物 类芬顿反应 催化剂 |
| 英文关键词 degradation methyl orange schwertmannite Fenton-like reaction catalyst |
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| 中文摘要 |
| 应用生物合成施氏矿物作为光助类芬顿反应催化剂促进甲基橙的降解. 施氏矿物通过A.f-LX5细胞悬浮液在初始pH值2.5和28℃时氧化FeSO4 3d生成,并进行X射线衍射和扫描电子显微镜表征. 本研究分析了不同初始pH、H2O2浓度及催化剂装载量对在光助类芬顿反应中甲基橙氧化降解效率的影响. 结果表明,生物合成施氏矿物具有较高的催化活性,并且通过羟基自由基机制使甲基橙降解. 在近中性、较高Cl-、SO42-及NO3-浓度条件下,施氏矿物仍然能保持较高催化甲基橙降解的效率. 本研究验证了以生物合成施氏矿物作为催化剂的异相光助类芬顿反应是一种处理含甲基橙废水有应用前景的高级氧化技术. |
| 英文摘要 |
| Biosynthesized schwertmannite was used as catalyst in photo-Fenton-like reaction to facilitate the degradation of methyl orange (MO). Schwertmannite was synthesized through the oxidation of FeSO4 by Acidithiobacillus ferrooxidans LX5 cell suspension at an initial pH 2.5 and 28℃ for 3 days and characterized using X-ray diffraction spectroscopy and scanning electron microscope. The oxidative degradation of MO in the photo-Fenton-like reaction was studied at different initial pH values of suspension, concentrations of H2O2 and dosages of catalyst. The results suggested that the biosynthetic schwertmannite showed a good catalytic activity in the MO degradation via·OH radical mechanism. Considerable degradation efficiency of MO was still obtained in approximately neutral condition or in the presence of high concentrations of chloride, sulfate and nitrate. This work demonstrated that the heterogeneous photo-Fenton-like reaction catalyzed by the biosynthetic schwertmannite is a promising advanced oxidation technology for the treatment of wastewater containing MO. |
