Abstract
In this work, the surface of Ag/CeO2 which was prepared using hydrothermal method was modified using three types of organic acid such as ascorbic acid, citric acid and oxalic acid as the post treatment of as-synthesized Ag/CeO2 catalyst. The modified catalyst was further characterized using energy dispersive X-ray (EDX) for its elemental composition and BET surface area. The sonocatalytic degradation of caffeine under ultrasonic irradiation was examined to investigate the effect of these organic acids on the modification of Ag/CeO2 catalyst. The result showed that ascorbic acid demonstrated the highest sonocatalytic degradation of caffeine compared to citric and oxalic acids. Meanwhile, the degradation of caffeine was improved from 72.8% to 78.9% for modified Ag/CeO2 catalyst using ascorbic acid as the surface modifier. Thus, this result indicates that this kind of organic acid might have potential to modify Ag/CeO2 catalyst surface and improve the sonocatalytic degradation of caffeine.
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