School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, PR China.
Environ Sci Technol. 2010 Aug 15;44(16):6384-9. doi: 10.1021/es1011093.
An efficient Fe(2)O(3)-pillared rectorite (Fe-R) clay was successfully developed as a heterogeneous catalyst for photo-Fenton degradation of organic contaminants. X-ray diffraction analysis and high-resolution transmission electron microscope analysis clearly showed the existence of the Fe(2)O(3) nanoparticles in the Fe-R catalyst. The catalytic activity of the Fe-R catalyst was evaluated by the discoloration and chemical oxygen demand (COD) removal of an azo-dye rhodamine B (RhB, 100 mg/L) and a typical persistent organic pollutant 4-nitrophenol (4-NP, 50 mg/L) in the presence of hydrogen peroxide (H(2)O(2)) under visible light irradiation (lambda > 420 nm). It was found that the discoloration rate of the two contaminants was over 99.3%, and the COD removal rate of the two contaminants was over 87.0%. The Fe-R catalyst showed strong adsorbability for the RhB in the aqueous solution. Moreover, the Fe-R catalyst still showed good stability for the degradation of RhB after five recycles. Zeta potential and Fourier transform infrared spectroscopy were used to examine the photoreaction processes. Finally, a possible photocatalytic mechanism was proposed.
一种高效的 Fe(2)O(3)-柱撑累托石（Fe-R）粘土被成功开发为一种用于光芬顿降解有机污染物的非均相催化剂。X 射线衍射分析和高分辨率透射电子显微镜分析清楚地表明，Fe(2)O(3)纳米粒子存在于 Fe-R 催化剂中。通过在可见光照射下（lambda > 420nm），用双氧水（H(2)O(2))评估了 Fe-R 催化剂对偶氮染料罗丹明 B（RhB，100mg/L）和典型持久性有机污染物 4-硝基苯酚（4-NP，50mg/L）的脱色和化学需氧量（COD）去除的催化活性。结果发现，两种污染物的脱色率均超过 99.3%，两种污染物的 COD 去除率均超过 87.0%。Fe-R 催化剂对水溶液中的 RhB 具有很强的吸附能力。此外，Fe-R 催化剂在五次循环后仍能很好地稳定降解 RhB。通过 Zeta 电位和傅里叶变换红外光谱研究了光反应过程。最后提出了一种可能的光催化机理。
