【摘要】 通过炭化工艺制备了花生壳基生物炭,探究了其对纸张染色废液中亚甲基蓝染料的吸附性能,并结合热力学和动力学理论分析了其吸附机制。研究发现,炭化后的花生壳表面杂质减少,孔隙结构清晰,所制备的花生壳基生物炭对亚甲基蓝的吸附率可达94.97%,吸附量为2.346 mg/g。等温吸附研究分析发现,花生壳基生物炭对亚甲基蓝的吸附符合Langmuir模型,吸附过程更趋于单层吸附,且吸附剂表面是均一稳定的,吸附过程极易于进行;热力学分析发现该吸附过程是吸热反应,吸附过程自发进行;动力学分析发现吸附过程符合拟二级动力学方程,以化学吸附为主,吸附速率与时间成反比。更多还原

【Abstract】 Peanut hull-based biochar was prepared by carbonization process. Its adsorption performance on methylene blue dye in paper dyeing waste liquid was investigated, and its adsorption mechanism was analyzed in combination with thermodynamics and kinetics. Results showed that the surface impurities of the carbonized peanut hull were reduced and the pore structure was clear. The prepared peanut hullbased biochar had adsorption rate of 94. 97% and adsorption capacity of 2. 346 mg/g for methylene blue. The analysis of isothermal adsorption indicated that the adsorption of methylene blue by peanut hull-based biochar conformed to the Langmuir model well. Adsorption process tended to be monolayer adsorption. The surface of the material was uniform and stable. Adsorption process was very easy to proceed. Thermodynamic analysis found that the adsorption process was an endothermic reaction. The adsorption process proceeded spontaneously. Kinetic analysis revealed that the adsorption process conformed to the pseudo-second-order kinetic equation, with chemical adsorption dominated.Adsorption rate was inversely proportional to time.更多还原