Zhang Hui, Zhang Jianhua, Zhang Chunyang, Liu Fang, Zhang Daobin
Department of Environmental Engineering, Wuhan University, Luoyu Road, 129#, Wuhan 430079, PR China.
Ultrason Sonochem. 2009 Mar;16(3):325-30. doi: 10.1016/j.ultsonch.2008.09.005. Epub 2008 Oct 2.
The combination of ultrasound and the advanced Fenton process (AFP, zero-valent iron and hydrogen peroxide) for the degradation of C.I. Acid Orange 7 was studied. The effect of hydrogen peroxide concentration, initial pH, ultrasonic power density, dissolved gas, and iron powder addition on the decolorization of C.I. Acid Orange 7 was investigated. A modified pseudo-first order kinetic model was used to simulate the experimental results. The results showed that the decolorization rate increased with the increase of hydrogen peroxide concentration and power density, but decreased with the increase of initial pH value. There existed an optimal iron powder addition when decolorization rate was concerned. The decolorization efficiency also increased with the increase of hydrogen peroxide concentration, but decreased with the increase of initial pH value. It varied little at different power densities or iron powder additions at the fixed hydrogen peroxide concentration. The presence of dissolved gas would enhance color removal, and the enhancement was more significant when dissolved oxygen was present. More hydrogen peroxide dosage and reaction duration are required to achieve a relatively high COD removal than those employed to simply break the chromophore group.
研究了超声波与高级芬顿法（AFP，零价铁和过氧化氢）联合用于降解酸性橙7的情况。考察了过氧化氢浓度、初始pH值、超声功率密度、溶解气体以及铁粉添加量对酸性橙7脱色的影响。采用修正的准一级动力学模型对实验结果进行模拟。结果表明，脱色率随过氧化氢浓度和功率密度的增加而升高，但随初始pH值的升高而降低。在脱色率方面存在一个最佳的铁粉添加量。脱色效率也随过氧化氢浓度的增加而提高，但随初始pH值的升高而降低。在固定的过氧化氢浓度下，不同功率密度或铁粉添加量时脱色效率变化不大。溶解气体的存在会提高脱色效果，当存在溶解氧时这种提高更为显著。与单纯破坏发色基团相比，实现较高的化学需氧量（COD）去除需要更多的过氧化氢用量和反应时间。
