| Abstract:The industrial alkali lignin was subjected to co-activation treatment with ZnCl2, KOH, Urea and carbonization at a high temperature of 700°C, resulting in the production of a lignin-based adsorption material with high adsorption capacity (Zn-LB). The prepared material was then used in adsorption experiments with methylene blue and methyl orange dyes to explore the effects of dye type, adsorption temperature, and a multi-component dye system on the adsorption capacity. The study results indicated that the specific surface area of the prepared Zn-LB samples reached 2190.3 m2/g. The maximum equilibrium adsorption capacities of Zn-LB for methylene blue and methyl orange, as fitted through the Langmuir adsorption isotherm model, were 1345.9 mg/g and 1732.4 mg/g, respectively. Additionally, the adsorption capacity for methylene blue increased with temperature, indicating that the adsorption of methylene blue was an endothermic process; Conversely, the adsorption capacity for methyl orange decreased with rising temperature, suggesting an exothermic process. Therefore, the prepared lignin-based adsorbent material showed excellent application potential in the field of dye wastewater treatment. |