Adsorption characteristics of pyridine on rayon-based activated carbon fiber

This article studied the static adsorption of pyridine and quinoline on rayon-based activated carbon fiber(rayon-based ACF),investigated the influencing factors of adsorption efficiency and behaviors such as time,dose,temperature and organic compound,and analyzed the adsorption type and process of typical organic pollutants of coking water from the aspects of kinetic,thermodynamic and molecular structure. The results showed that when the initial concentration of pyridine wastewater was 25mg/L,the maximum adsorption capacity was 17.66mg/g and it took about 60 min to reach the adsorption equilibrium. Adsorption efficiency decreased with increasing temperature. The presence of quinoline inhibited the adsorption efficiency of pyridine,and the adsorption rate of pyridine was significantly decreased. Pyridine adsorption processes of carbon fiber agreed with pseudo second-order kinetic model with the correlation coefficient of 0.9999. Freundlich isotherm of pyridine adsorption on the ACF at liquid temperature of 22℃ was q=2.3138ce0.9540. ΔG0 and ΔH0 were both negative,indicating spontaneous and exothermic adsorption.