Preparation of lignin-based carbon microporous materials using cesium chloride and characterization

A carbon adsorbent material with a specific surface area of 342 m²/g was prepared via chemical activation, using lignin as the raw material and CsCl as the activator. The adsorbent’s structure was characterized and its performance for methylene blue solution was investigated. Additionally, adsorption experiments of crystalline violet dye were conducted at different temperatures to study the adsorption thermodynamics. The results indicated that the prepared activated carbon material featured a smooth surface with abundant pores. Its adsorption capacity for methylene blue reached 161 mg/g, enabling rapid and efficient adsorption of methylene blue solution. Additionally, it exhibited excellent adsorption performance for crystalline violet solution: at 40 °C, the saturated adsorption capacity reached 243 mg/g with a removal of 93%, and the adsorption process was confirmed to be a spontaneous thermodynamic reaction. The experiments confirmed that CsCl can serve as an activator for activating lignin-based raw materials to prepare carbon samples.