Degradation of dye Reactive Blue 19 by Iron-Activated Carbon Catalyzed Persulfate
Date Issued
2013
Date
2013
Author(s)
Wang, An-Chi
Abstract
Persulfate can be thermally or chemically catalyzed to produce sulfate and hydroxyl free radicals which have very powerful oxidation ability. These advantages of being the strongest oxidants make persulfate a promising choice among the advanced oxidation processes (AOPs) for treating organic pollutants. Reactions of persulfate are generally slow at ambient temperature, so we use Iron-modified activated carbon to be the activator of PS to accelerate the degradation of anthraquinone dye RB19. In this study, we investigated the effect of iron coated ratios, dosages of persulfate and Fe/AC, initial solution pH(3, 7 and 10), temperature(25, 35 and 45 ℃) on the RB19 removal. In addition, the difference of the degradation potential between three systems: PS, Fe/AC, Fe/AC+PS were also investigated.
In PS system, the removal efficiency of RB19 increased with higher PS dosage and higher temperature. The alkaline pH is more favorable to the RB19 degradation because this condition will make PS decomposed to produce ‧OH which has higher redox potential. The surface characterization of Fe/AC showed that the specific surface area of AC decreased with more iron coated. With the decrease of adsorption and activation position, the removal ratio of RB19 would reduce. Furthermore, the optimum iron coated ratio was 1% and the removal process followed the Intraparticle diffusion model or Pseudo-second-order kinetic model in Fe/AC system.
In Fe/AC+PS system, the removal efficiency of RB19 increased with higher PS dosage and higher temperature. But excessive dosage of Fe/AC would inhibit the catalytic ability because Fe2+ will consume the produced sulfate radicals. There existed a remarkable synergistic effect in combined system which can remove 95.68% of RB19 under optimum operational conditions of 0.5g/L 1%Fe/AC, PS/RB=50, pH 10, 45℃.
Subjects
催化
過硫酸鹽
高級氧化
活性碳
蒽醌染料
鐵
Type
thesis
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