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The adsorption and catalytic ozonation of Acid Red 3R by the granular activated carbon modified with nitric acid oxidation and Fe oxides loaded were investigated in this study. The variation of surface functional groups of treated activated carbon samples was determined. The influences of pH and ·OH scavenger on catalytic ozonation were discussed. The results showed that the total surface functional groups of activated carbon, including carboxyl group, lactone group and phenolic hydroxyl group, increased significantly after nitric acid modification, especially for carboxyl group. However, the amount of surface functional groups of activated carbon was reduced after Fe oxides loaded. The larger amount of surface functional groups could improve the adsorption capacity of activated carbon samples. The catalytic ozonation of Acid Red 3R by activated carbon samples was more efficient than ozonation alone. An increase in the surface functional groups of activated carbon could accelerate catalytic ozonation, but consumption of the surface functional groups during catalytic ozonation resulted in reduced reaction rate. Comparatively, the Fe oxides loaded activated carbon showed more stable and effective catalytic ozonation activity. The catalytic ozonation seemed more efficient under alkaline condition rather than acidic condition, and higher pH value was favorable for catalytic ozonation. The performance of catalytic ozonation by activated carbon samples decreased significantly in the presence of ·OH scavenger (Na2CO3), due to ·OH consumption by Na2CO3. ©, 2014, Science Press. All right reserved.
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