Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
J Hazard Mater. 2010 May 15;177(1-3):743-9. doi: 10.1016/j.jhazmat.2009.12.094. Epub 2010 Jan 4.
4A-zeolite supported alpha-Fe(2)O(3) (Fe-4A) was prepared with a hydrothermal-calcination method, and characterized by XRD. Iron oxide in the Fe-4A composite appeared in alpha-Fe(2)O(3) phase and was highly dispersed on the surface of 4A zeolite. Fe-4A composite effectively degraded Orange II under acidic and neutral conditions via sono-Fenton process. 4A-zeolite promoted the production of cavitation bubbles under ultrasonic treatment, while alpha-Fe(2)O(3) promoted the homolysis of oxygen molecule producing hydroxyl radical and high-valent iron-oxo species. Both actions benefited the sono-Fenton reactivity of Fe-4A. Fe-4A-4 composite with a practical alpha-Fe(2)O(3) content of 24.9% showed the maximum sono-Fenton reactivity to Orange II. Dissolved iron ion measurement showed that Fe-4A composite represented a low iron ion dissolution-level, while the repeatability test of recycled Fe-4A showed that Fe-4A composite has high reactivity stability and a long life-time under neutral condition in the sono-Fenton reaction.
4A-沸石负载的α-Fe(2)O(3)（Fe-4A）采用水热-煅烧法制备，并通过 XRD 进行了表征。Fe-4A 复合材料中的氧化铁以α-Fe(2)O(3)相存在，并高度分散在 4A 沸石的表面上。Fe-4A 复合材料通过声芬顿过程在酸性和中性条件下有效降解了橙色 II。4A-沸石在超声处理下促进空化气泡的产生，而α-Fe(2)O(3)促进氧分子的均裂产生羟基自由基和高价铁氧物种。这两个作用都有利于 Fe-4A 的声芬顿反应性。具有实际α-Fe(2)O(3)含量 24.9%的 Fe-4A-4 复合材料对橙色 II 表现出最大的声芬顿反应性。溶解铁离子测量表明，Fe-4A 复合材料表现出低的铁离子溶解水平，而重复使用的回收 Fe-4A 的测试表明，在中性条件下的声芬顿反应中，Fe-4A 复合材料具有高的反应稳定性和长的寿命。
