| Summary: | 碩士 === 雲林科技大學 === 環境與安全工程系碩士班 === 97 === In this study, commercial mlti-walled carbon nanotubes (MWCNTs) was modified with microwave and chemical agents including HNO3, SOCl2, and NH4OH, then applied to adsorption aqueous Reactive Blue 19(RB19) using these modified CNTs. The main structure of CNTs using these modified methods was not destroyed by SEM and HR-TEM observation. In addition, by the FTIR and Zeta-potential analyzed, the characteristic form of modified CNTs was changed and a lot of functional groups on the surface. Therefore, the absorption ability of modified CNTs should be increased.
The experimental results indicated that the saturated amount of original CNTs was 13.3mg/g and the saturated amount of modified CNTs increased to 27.7 mg/g under pH 7. The absorption ability was increased about 40% in modified CNTs under pH 4 and 280 K and calculating the kinetics of adsorption, the pseudo-second-order model was suitable. In addition, the adsorption capacity of aqueous RB19 using modified CNTs increased with temperature and Langmuir model showed higher fitting according to simulate the experimental data. The simulation of thermodynamics established that the ΔH0 and ΔS0 of the system was positive, and ΔG0 was negative, indicating endothermic reaction and irreversible spontaneity reacted. The readsorption ability still existed and the desorption process carried out under microwave 1,000 watt and 30 minutes.
|
|---|
