Preparation and phenol adsorption property of tobacco stem based modified porous materials

摘要

Tobacco stem based modified porous materials were prepared by a combined methods of fermentation, microwave drying, anulation, semi-carbonization and modification, in which the residue of tobacco stem was used as raw material, and the KOH was used as modifier. The structural characteristics and properties of the porous materials were characterized by the scanning electron microscopy, specific surface areas, pore analyzer and infrared analyzer. The adsorption isotherm model, the adsorption kinetics analysis, the adsorption thermodynamics of phenol solution were analyzed. The results showed that: the excellent produced conditions for the porous materials were as follows: The surface of the porous materials modified by the KOH was typical porous structure ,which mainly based on a large number of cavities and pores. The material had higher specific surface areas and pore volumes. The porous materials possesses more abundant functional groups, such as-OH,-CH and other functional groups, so that the material had a certain pro-organics. The adsorption isotherm model of phenol solution was simulated, which accorded with Freundlich isotherm adsorption equation model. The quasi-second-order kinetic model is suitable for the adsorption of the modified porous materials.The study of the adsorption thermodynamics showed that the adsorption was physical adsorption, and the adsorption behavior was exothermic.