Lignosulfonate, one of the lignin derivatives, was extracted from the black liquor as a byproduct of the wood and paper industry. It was used to prepare magnetic aminated lignosulfonate/carbon (MALS/C) adsorbent for the adsorption of Congo red and methyl orange dyes from an aqueous solution. The physical and chemical characteristics of the synthesized samples were determined by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), thermal gravimetric analysis (TGA), and field emission scanning electron microscopy (FESEM). The MALS/C adsorbent performance in the adsorption process of Congo red and methyl orange dyes was examined in a batch system. The effects of essential parameters, such as pH of the solution, adsorbent dosage, contact time, initial concentration of dye, and temperature, on the adsorption of the mentioned dyes, were assessed. The maximum removal efficiency of Congo red in the conditions (adsorbent dosage 0.01 g, contact time 120 min, initial dye concentration 20 mg/L, pH 6, and temperature 25 °C) and methyl orange in the conditions (adsorbent dosage 0.01 g, contact time 120 min, initial dye concentration 20 mg/L, pH 2, and temperature 25 °C) was 97.09 and 72.08%, respectively. Besides, after five regeneration times, the removal efficiency for Congo red and methyl orange dyes under a similar condition declined to 81 and 58%, respectively. The kinetics and adsorption isotherms examination were performed. The results demonstrated that the adsorption data for both dyes were consistent with the pseudo-second-order kinetic model and the Langmuir adsorption isotherm. The maximum adsorption capacity calculated by the Langmuir model was 167.61 and 121.28 mg/g for Congo red and methyl orange dyes, respectively. The thermodynamic studies indicated that the adsorption process was spontaneous and endothermic.

木质素衍生物之一的木质素磺酸盐作为木材和造纸工业的副产品从黑液中提取出来。用于制备磁性胺化木质素磺酸盐/碳 (MALS/C) 吸附剂，用于从水溶液中吸附刚果红和甲基橙染料。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、振动样品磁力计（VSM）、热重分析（TGA）和场发射扫描电子显微镜（FESEM）对合成样品的物理和化学特性进行了测定）。在批处理系统中检测了 MALS/C 吸附剂在刚果红和甲基橙染料吸附过程中的性能。基本参数的影响，例如溶液的 pH 值、吸附剂用量、接触时间、染料的初始浓度和温度，对上述染料的吸附进行了评估。条件（吸附剂用量 0.01 g，接触时间 120 min，染料初始浓度 20 mg/L，pH 6，温度 25 °C）和甲基橙（吸附剂用量 0.01 g，接触时间 120 分钟，初始染料浓度 20 mg/L，pH 2，温度 25 °C）分别为 97.09 和 72.08%。此外，经过5次再生后，类似条件下刚果红和甲基橙染料的去除率分别下降至81%和58%。进行动力学和吸附等温线检查。结果表明，两种染料的吸附数据均符合准二级动力学模型和Langmuir吸附等温线。Langmuir 模型计算的刚果红和甲基橙染料的最大吸附容量分别为 167.61 和 121.28 mg/g。热力学研究表明吸附过程是自发的和吸热的。