The discharge of dye-containing industrial effluents such as methylene blue (MB) in water bodies has resulted in severe aquatic and human life problems. In addition to this factor, there is the accumulation of banana peel wastes, which can generate ecological damage. Thus, this research purpose a different method from the literature using the banana peel waste (BP) to produce activated carbon (ACBP) by NaOH activation followed by pyrolysis at 400 °C to remove methylene blue (MB). The material was characterized by TGA, XRD, SEM, BET, and FTIR. The influence of dye concentration (10, 25, 50, 100, 250, and 500 mg L⁻¹) was investigated. ACBP presented a well-developed pore structure with a predominance of mesopores and macropores. This morphological structure directly influences the MB removal capacity. The highest efficiency for dye removal was in the MB initial concentration of 25 mg L⁻¹, sorbent of 0.03 g, and contact time of 60 min, which were 99.8%. The adsorption isotherms were well defined by Langmuir, Freundlich, and Temkin isotherm models. The Langmuir model represented the best fit of experimental data for ACBP with a maximum adsorption capacity of 232.5 mg g⁻¹. This adsorbent showed a comparatively high performance to some previous works. So, the banana peel waste is an efficient resource for producing activated carbon and the adsorption of methylene blue.

水体中含有染料的工业废水（例如亚甲蓝（MB））的排放已导致严重的水生和人类生活问题。除此因素外，还有香蕉皮废料的堆积，会产生生态破坏。因此，本研究的目的是不同于文献的方法，该方法使用香蕉皮废料（BP）通过NaOH活化然后在400°C下热解以去除亚甲基蓝（MB）来生产活性炭（ACBP）。通过TGA，XRD，SEM，BET和FTIR对材料进行了表征。染料浓度（10、25、50、100、250和500 mg L ^-1的影响）进行了调查。ACBP呈现出发达的孔结构，其中以中孔和大孔为主。这种形态结构直接影响MB的去除能力。染料去除的最高效率是MB的初始浓度为25 mg L ^-1，吸附剂为0.03 g，接触时间为60分钟，为99.8％。吸附等温线由Langmuir，Freundlich和Temkin等温线模型很好地定义。Langmuir模型代表了ACBP实验数据的最佳拟合，最大吸附容量为232.5 mg g ^-1。与以前的一些工作相比，这种吸附剂表现出较高的性能。因此，香蕉皮废料是生产活性炭和吸附亚甲基蓝的有效资源。