A low-cost activated carbon from the banana stem (ACBS) was produced to contribute to environmental preservation in removing methylene blue from wastewater. It is originated from abundant agricultural waste and produced at moderate pyrolysis temperature and short pyrolisis time. In the ACBS production, the banana stem was impregnated with H₃PO₄ solution as the activating agent and followed by pyrolysis at 400 °C for a rapid time of 15 min. The treatment significantly improved the ACBS surface area to 837.453 m²/g. The influence of the ACBS dose and initial concentration of dye solution at various contact times were investigated in this study. The utilization of ACBS in low doses exhibited high removal efficiency of methylene blue (0.05 to 0.3 g/100 mL). It can remove methylene blue completely in 90 min of adsorption with an initial concentration of 50 g/mL. High removal efficiencies are still also demonstrated at higher initial concentrations with 99.762% removal for the initial concentration of 200 g/mL. Equilibrium adsorption data had the best agreement to the Freundlich isotherm model and pseudo-second-order kinetics model. It is predicted that ACBS has a maximum adsorption capacity of 101.01 mg/g. ACBS is an environmentally benign and favorable adsorbent in methylene blue removal and also effective for repeated usage up to 6 consecutive times with no desorption step.

来自香蕉茎 (ACBS) 的低成本活性炭被生产出来，有助于环境保护，从废水中去除亚甲蓝。它来源于丰富的农业废弃物，在适中的热解温度和较短的热解时间下生产。在 ACBS 生产中，香蕉茎用 H ₃ PO ₄溶液作为活化剂浸渍，然后在 400 °C 下热解 15 分钟。处理显着提高了 ACBS 表面积至 837.453 m ²/G。本研究研究了 ACBS 剂量和染料溶液初始浓度在不同接触时间的影响。以低剂量使用 ACBS 表现出对亚甲蓝的高去除效率（0.05 至 0.3 g/100 mL）。吸附90分钟即可完全去除亚甲蓝，初始浓度为50 g/mL。在较高的初始浓度下也表现出高去除效率，初始浓度为 200 g/mL 时去除率为 99.762%。平衡吸附数据与 Freundlich 等温线模型和准二级动力学模型的一致性最好。据预测，ACBS 的最大吸附容量为 101.01 mg/g。