As an important agricultural residue, corn stalks have been continuously used in various industries. In this work, lignin, the by-product of xylan extraction from corn stalks, was used as a useful adsorbent for the removal of methylene blue from aqueous solutions. Lignins were precipitated from the hydrolysates of pH 3 (LG3) and 5 (LG5), hoping to explore the difference in adsorption performance between the two. Detailed discussions were performed to provide a firm evaluation of adsorption models followed by batch experiments to analyze the methylene blue adsorption performance. Results showed that the lignin obtained at pH 5 had a better adsorption capacity compared with pH 3, which was mainly caused by the difference in specific surface area. When the optimal adsorption conditions (pH: 10; temperature: 35 °C; adsorption time: 90 min) were achieved, the maximum adsorption capacity of LG5 can reach 134.3 mg/g, which was much higher than those of most unmodified lignins extracted from other biomass energy sources. Regarding the adsorption behavior, the adsorption data were fitted by pseudo-second-order kinetics model and the isotherm adsorption equilibrium followed the Langmuir model. Overall, these results indicate that lignin, the by-product of xylan extraction, offers a great potential for removing methylene blue from wastewater.

玉米秸秆作为一种重要的农业废弃物，在各行各业中不断得到利用。在这项工作中，木质素是从玉米秸秆中提取木聚糖的副产品，被用作一种有用的吸附剂，用于去除水溶液中的亚甲蓝。木质素从 pH 3 (LG3) 和 5 (LG5) 的水解产物中沉淀出来，希望探索两者在吸附性能上的差异。进行了详细的讨论以提供对吸附模型的可靠评估，然后进行批量实验以分析亚甲基蓝的吸附性能。结果表明，与pH 3相比，在pH 5下获得的木质素具有更好的吸附能力，这主要是由于比表面积的差异造成的。当达到最佳吸附条件（pH：10；温度：35 ℃；吸附时间：90 min）时，LG5的最大吸附量可达134.3 mg/g，远高于大多数未改性木质素提取物的吸附量。其他生物质能源。关于吸附行为，吸附数据采用准二级动力学模型拟合，等温吸附平衡遵循朗缪尔模型。总体而言，这些结果表明，木聚糖提取的副产品木质素为从废水中去除亚甲蓝提供了巨大的潜力。