Adsorption properties of activated carbon fiber for highly effective removal of methyl orange dye

[摘要] A commercial activated carbon fiber (ACF) was applied as efficient adsorbents for adsorption of methyl orange (MO) dye in aqueous solution. The surface morphology and surface area were characterized by scanning electron microscopy (SEM) and N2 adsorption, respectively. The results showed that ACF had good adsorption capacity on MO dye due to the large surface area and excellent pore size structure. In addition, the adsorption property of MO dye in aqueous solution onto ACF was investigated as a function of the initial dye concentration, pH value and temperature of solution. It's observed that the adsorption capacity of ACF for MO dye increased with the increases in the initial dye concentration and the temperature of solution, but the pH value had no significant effect on ACF adsorption performance. Langmuir, Freundlich and Temkin isotherm models were employed to fit the equilibrium isotherm data, and the Langmuir model fitted the experimental data best implying the homogeneity of the adsorbent surface sites. Besides, thermodynamics parameters, Gibbs free energy ΔG0, entropy ΔS0 and enthalpy ΔH0, were calculated, and the values indicated that the phisisorption process of MO dye onto ACF was spontaneous, endothermic and attractive.

[发布机构] Yangjiang Polytechnic, Yangjiang, China^1;Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, China^2

[学科分类] 环境科学（综合）

[关键词] Adsorbent surfaces;Adsorption capacities;Adsorption performance;Adsorption properties;Commercial activated carbons;Equilibrium isotherms;Initial dye concentration;Thermodynamics parameters