In this study, the potential efficiency in adsorption process, as a functional use route, of laterite ore residues (LR) produced from atmospheric acid leaching was evaluated for methylene blue (MB) removal representing cationic organic pollutants discharged in large amounts from industry into aquatic environment. Adsorption process was optimized by using Box-Behnken design based on Response Surface Methodology (RSM) to determine correlation between responses as, adsorption efficiency (%) and adsorption capacity (mg/g), and 3 independent variables with 3 levels (pH, initial MB concentration and LR amount). 98.29 ± 0.63% of adsorption efficiency and 3.072 ± 0.280 mg/g of adsorption capacity were achieved in determined optimum conditions; pH = 5.2, C₀ = 50 mg/L MB and m = 0.40 g. The good agreement between predicted and experimental values observed by comparison of values showed accuracy of model at 95% confidence level. Furthermore, it was determined that nature of adsorption equilibrium complied Freundlich isotherm model and adsorption mechanism was well defined with pseudo-second-order kinetics model. Thus, process exhibited a heterogeneous multilayer adsorption behavior and mainly controlled by chemical reactions. Furthermore, the adsorption mechanism was determined by characterization of residues, before and after adsorption by scanning electron microscopy with energy dispersive of X-ray (SEM−EDAX), Fourier-transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD).

在这项研究中，作为一种功能性使用途径，对常压酸浸产生的红土矿渣 (LR) 的吸附过程的潜在效率进行了评估，以去除代表从工业中大量排放到水产中的阳离子有机污染物的亚甲基蓝 (MB)。环境。通过使用基于响应面方法 (RSM) 的 Box-Behnken 设计优化吸附过程，以确定响应之间的相关性，吸附效率 (%) 和吸附容量 (mg/g)，以及具有 3 个水平（pH、初始值）的 3 个自变量MB 浓度和 LR 量）。在确定的最佳条件下实现了98.29±0.63%的吸附效率和3.072±0.280mg/g的吸附容量；pH = 5.2，C ₀ = 50 mg/L MB 和 m = 0.40 g。通过值的比较观察到的预测值和实验值之间的良好一致性表明模型的准确性在 95% 的置信水平。此外，确定吸附平衡的性质符合Freundlich等温线模型，吸附机理用拟二级动力学模型很好地定义。因此，过程表现出多相多层吸附行为，主要受化学反应控制。此外，通过扫描电子显微镜与 X 射线能量色散 (SEM-EDAX)、傅里叶变换红外 (FTIR) 光谱和 X 射线衍射 (XRD) 对吸附前后残留物的表征来确定吸附机制.