香蕉皮对活性艳蓝X-BR的吸附平衡及动力学研究

Adsorption kinetics and equilibrium of reactive brilliant blue X-BR onto banana peel

研究了农业废弃物香蕉皮对水溶液中活性艳蓝X-BR的静态吸附特性。探讨了吸附剂量、溶液pH、吸附时间、染料初始浓度等参数对吸附的影响,用Langmuir、Freundlich和Temkin等温式研究了吸附平衡过程。结果表明,在酸性条件下有利于香蕉皮吸附剂对活性艳蓝X-BR的吸附,吸附过程在90 min可达到平衡,香蕉皮对活性艳蓝X-BR的吸附更符合Freundlich等温式。吸附动力学研究表明,吸附过程更符合准二级动力学模型,颗粒内扩散不是吸附速率的唯一控制步骤。

The adsorption removal of reactive brilliant blue X-BR from aqueous solution by banana peel was studied in a batch process. Experiments were carried out as function of adsorbent dosage, pH, contact time and initial reactive brilliant blue concentration. The adsorption isotherms were modeled with Langmuir, Freundlich and Temkin isotherms. The results indicate that it is favorable for the adsorption of reactive brilliant blue from aqueous solution by banana peel under acid conditions. The adsorption process was fast, and it reached equilibrium in 90 min contact time. The date fitted well with the Freundlich isotherms. The kinetic data were analyzed using pseudo-first-order and pseudo-second-order models. The results show that the pseudo-second-order model was the best for the adsorption reactive brilliant blue by banana peel. The intraparticle diffusion was not only rate controlling step.