Modified multi-walled carbon nanotube by microwaves treatment and comparison of adsorption effect using aqueous bisphenol A

• Main Authors: Jen-Yu Lo, 羅仁昱
• Other Authors: Chao-Yin Kuo
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/67149682752272024363

碩士 === 國立雲林科技大學 === 環境與安全工程系碩士班 === 95 === This study compares aqueous bisphenol A adsorbed onto as-grown and modified carbon nanotubes (CNTs), using microwave/ammonium hydroxide(NH4OH) processes. Microwave/ammonium hydroxide modifications reduced the pHiep and Fourier Transform Infrared Spectroscopy (FTIR) analysis revealed that some functional groups base the nitrogen atom, for example C - N group and C ≡N group were formed on modified CNTs. In this study, the best condition for bisphenol A adsorbed carbon nanotubes was pH 6 47℃. Simulation results indicated that the ΔH0 values of as-grown, microwave/ammonium hydroxide-modified CNTs and the behavior of adsorption was endothermic and spontaneous reaction. Adsorption of bisphenol A onto -modified microwave/ammonium hydroxide-modified CNTs is suggested to proceed by physisorption and chemisorption. The adsorption capacity of aqueous bisphenol A onto modified CNTs increased more than that of as-grown CNTs, at pH 2-8. The adsorption experiments indicated that equilibrium adsorption capacity from 26.47 mg/g increase to 31.15 mg/g. Additionally, the adsorption capacity of aqueous bisphenol A onto as-grown and modified CNTs both increased with temperature, and the results indicated that the Langmuir isotherm fitted the experimental data well. Therefore, the results demonstrate that the modified processes increased the adsorption capacity of organic material because the functional groups were present on the modified surfaces of the CNTs.