| Summary: | 碩士 === 雲林科技大學 === 化學工程與材料工程研究所 === 96 === The aim of this thesis is to investigate adsorption and electrosorption of copper ion from wastewater on variously activated carbon fibers (ACFs) cloths. The commercial polyacrylonitrile-based ACFs cloth was modified by nitric acid or impregnated by chitosan solution. Adsorption/electrosorption capacities of copper ions were also studied as dilute complexing agents, such as EDTA and sodium citrate, existed in wastewater. The modified ACFs cloths were characterized using nitrogen adsorption, FTIR, and cyclic voltammetry. A static state adsorption system was designed to measure adsorption/electrosorption capacity of copper ion on the ACFs cloth. The adsorption/electrosorption capacity of ACFs cloth with different bias potentials were measured, and the electrosorption isotherms were also investigated.
Experimental results showed that surface functional groups of ACFs cloth was one of key factors on adsorption efficiency. Activated carbon cloth modified by chitosan enhanced adsorption/electrosorption efficiency. The cause was attributed that the ACFs cloth modified by chitosan contained amino groups for chelating copper ions. In addition, adsorption/electrosorption capacity of copper ion on ACFs increased as dilute complexing agent existed in wastewater. Experimental results also revealed that electrosorption can effectively increase the adsorption capacity. The adsorption/electrosorption of copper ion on carbon cloth followed Langmuir isotherms. The equilibrium adsorption capacity at 0.3 V was 24.74 mg/g, which was nearly two times higher than that at open circuit.
|
|---|
