The main objective of this work is to use soybean hull (SBH) waste as an adsorbent for the removal of two industrial textile dyes: Reactive Blue 21 (RB21) and Reactive Yellow 145 (RY145). Physical characterization of SBH and kinetic and equilibrium experiments were performed to determine the adsorption conditions. The best adsorption condition was pH 2.0 because the zero electrical charge of soybean hulls (pH_Z = 0) is 5.27; thus, in an acidic pH, the adsorbent is positively charged, and the dyes keep their anionic charges due to the –SO₃⁻ and –OSO₃⁻ groups. Kinetic data were better represented by the Elovich kinetic model, evidencing two well-differentiated mass transfer regions, which agrees with a pseudo-second-order kinetic mechanism. The experimental data showed that RB21 and RY145 were fitted with Hill and Redlich–Peterson isotherm models, respectively. Consequently, the maximum adsorption capacities of SBH for RB21 and RY145 dyes were 149 mg/g and 87 mg/g, respectively. Dye adsorption in packed bed column was also assayed at different bed heights, flow rates, and inlet concentration of dyes. The Thomas, Yoon–Nelson, and modified dose-response (MDR) models fitted well to the breakthrough curves, the MDR model being the one with the highest correlation coefficients, with 96.5% and 94.4% removal of RY145 and RB21 dyes, respectively.

这项工作的主要目的是使用大豆壳（SBH）废料作为吸附剂，以去除两种工业用纺织品染料：活性蓝21（RB21）和活性黄145（RY145）。进行了SBH的物理表征以及动力学和平衡实验，以确定吸附条件。最佳的吸附条件是pH 2.0，因为大豆皮的零电荷（pH _Z = 0）为5.27；而大豆皮的零电荷为5.27。因此，在酸性pH中，吸附剂被带正电，染料保持他们的阴离子电荷由于-SO ₃ ^-和-OSO ₃ ^-组。动力学数据可以用Elovich动力学模型更好地表示，该模型证明了两个完全不同的传质区域，这与拟二级动力学机理相符。实验数据表明，RB21和RY145分别适用于Hill和Redlich-Peterson等温模型。因此，SBH对RB21和RY145染料的最大吸附容量分别为149 mg / g和87 mg / g。还可以在不同的床高，流速和染料入口浓度下测定填充床柱中的染料吸附。Thomas，Yoon–Nelson和修正的剂量反应（MDR）模型与突破曲线非常吻合，该MDR模型是相关系数最高的模型，RY145和RB21染料的去除率分别为96.5％和94.4％。