Photodegradation of organic pollutants catalyzed by iron species under visible light irradiation.
Photodegradation of organic pollutants catalyzed by iron species under visible light irradiation.
复制标题
DOI：
10.1039/c0cp01203c
复制
发表时间：
2011-01
期刊：
影响因子：
--
通讯作者：
Chunyan Sun;Chuncheng Chen;Wanhong Ma;Jincai Zhao
中科院分区：
文献类型：
--
作者：
Chunyan Sun;Chuncheng Chen;Wanhong Ma;Jincai Zhao
绿色氧化技术是有机污染物处理中最具经济吸引力和环境友好的氧化技术。利用过氧化氢或理想的分子氧作为氧化剂，水作为溶剂，光催化降解有机污染物是一种理想的绿色氧化技术。然而，该系统也有一些缺点。该反应必须在酸性条件下进行，以避免铁离子沉淀和铁污泥在反应中积累。此外，利用氢氧化氢(2)O(2)意味着储存和运输成本高，风险大，有机污染物不能完全矿化。从这个角度来看，我们报告了对芬顿系统处理水中有机污染物的改进的系统调查。为了克服上述缺点，提高效率，在Fenton系统上研究了几种策略。例如，为了扩大Fenton体系的应用范围并在中性pH下进行，使用铁配合物代替Fe(2+)/Fe（3+）。而且，铁配合物在可见光区有很强的吸收，导致无色的有机污染物在可见光照射下分解。具有特殊结构的铁配合物可以在温和条件下激活O(2)分子而不是H(2)O(2)，并且负载的铁种在重复使用后保持较高的催化活性，只需过滤即可重复使用。最后，对其实际应用需要进一步开展的工作进行了展望。
The green oxidation technology is the most economically attractive and environmentally friendly oxidation technique in the treatment of organic pollutants. Photocatalytic degradation of organic pollutants by iron species is a desired green oxidation technique due to using hydrogen peroxide or ideally molecular oxygen as oxidant and water as solvent. However, the system has some disadvantages. The reaction has to be performed in acidic conditions in order to avoid Fe ion precipitation and iron sludge will be accumulated in the reaction. Moreover, the utilization of H(2)O(2) means a high cost and risks in the storage and transportation and organic pollutants can not be completely mineralized. In this perspective, we report a systematic investigation of the improvement in the Fenton system for treatment of organic pollutants in water. Several strategies have been studied on the Fenton system for overcoming the above mentioned shortcomings and enhance the efficiency. For example, in order to extend the application of the Fenton system and perform it at neutral pH, iron complexes were used to replace the Fe(2+)/Fe(3+). Moreover, iron complexes have a strong absorption in the visible region, which leads to decomposition of colorless organic pollutants under visible light irradiation. Iron complexes with special structures can activate molecular O(2) instead of H(2)O(2) under mild conditions and the supported iron species maintains a high catalytic activity after repeated use and can be reused simply by filtration. Finally, prospects for further work required to be performed for its practical application is discussed.