| Summary: | 碩士 === 國立雲林科技大學 === 環境與安全衛生工程系 === 106 === In this study, microwave heating was used as a quickly method to prepare waste carbon fiber as an environmental adsorption material, and then compared the effect of addition of hydrogen peroxide on the acidification of nitric acid and phosphoric acid to adsorb dye RhB in water.
The results of this study showed that the surface of the carbon fiber modified by different acidifiers and microwave temperatures had irregular surface structures as the temperature increased. When the microwave temperature exceeded 600°C, the oxygen atoms on the surface of the PC series modified by phosphoric acid were significantly increased. Under the same microwave conditions, phosphoric acid was preferred because of the more oxygen-containing functional groups on the surface. The best environmental adsorbent PC600 prepared yield in this study was 20.7%, and its burning loss temperature exceeded 500°C, indicating that the characteristics of the waste carbon fiber could be used to facilitate the regeneration after high temperature heat.
PC600 had the best adsorption capacity at pH=7 at 27°C was 68.91 mg/g. It was shown that the PC600 adsorbent prepared in this study was most beneficial to the adsorption of pollutant RhB under neutral environment. The isothermal experiments showed that the adsorption capacity of PC700 at 57°C could up to 165.91 mg/g. The adsorbents in this study met the Freundlich mode and pseudo-second-order simulation. The modified procedure of this study was simple, both the removal capacity in water and reproducibility were good. It could be called as a new environmental material.
Key words: Phosphoric acid, Nitric acid, Waste carbon fiber, Microwave modification, Adsorption, Rhodamine B
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