MG, an organic compound composed of triphenyl methane, is often widely used in various industries, especially in the food, pharmaceutical and textile industries. This study emphasizes the green synthesis of novel magnetic iron oxide nanoparticles-loaded sawdust carbon (Fe₃O₄/SC) and their effect on the removal of MG from the aqueous solution. To obtain the optimum conditions of MG removal using the Box–Behnken model, the independent variables such as the initial MG concentration (10–100 mg/L), pH (3–9), reaction time (10–60 min), and Fe₃O₄/SC nanocomposites dose (0.2–1 g/L) were experimented. According to the quadratic model, the highest removal rate (89.22%) was found at the pH of 8.62, the contact time of 59.86 min, the Fe₃O₄/SC ncs dose of 0.59 g /L and the MG level of 17.62 mg/L. The MG removal rate follows the pseudo-second-order model and the Langmuir model. The maximum absorption capacity for MG was 41.66 mg/g. These findings suggest that the Fe₃O₄/SC ncs has a significant potential for the MG adsorption from aqueous solution.

MG是一种由三苯甲烷组成的有机化合物，常被广泛应用于各个行业，尤其​​是食品、制药和纺织行业。本研究强调了新型磁性氧化铁纳米颗粒负载锯末碳 (Fe ₃ O ₄ /SC) 的绿色合成及其对从水溶液中去除 MG 的影响。为了获得使用 Box-Behnken 模型去除 MG 的最佳条件，自变量如初始 MG 浓度（10-100 mg/L）、pH（3-9）、反应时间（10-60 分钟）和对Fe ₃ O ₄ /SC 纳米复合材料剂量 (0.2–1 g/L) 进行了实验。根据二次模型，在 pH 值为 8.62、接触时间为 59.86 min、Fe₃ O ₄ /SC ncs 剂量为 0.59 g /L，MG 水平为 17.62 mg/L。MG去除率遵循伪二阶模型和Langmuir模型。MG 的最大吸收量为 41.66 mg/g。这些发现表明，Fe ₃ O ₄ /SC ncs 具有从水溶液中吸附 MG 的显着潜力。