The presence of dye effluents released from dye-using industries has emerged as a great environmental concern in recent years. Adsorption is considered as an efficient method for capturing contaminants from wastewater. However, due to limited adsorption efficiency, selectivity, and regeneration capability of adsorbents, it is difficult to solve the prevailing dye effluent issue. In this work, we prepared a highly efficient and selective lignin-derived sulfonated porous carbon (LSPC) adsorbent from cornstalk by a facile etching-sulfonation process by using Fe₃O₄ as a templating agent. Profiting from high density of negatively charged groups (including − SO₃H, −COOH, and phenolic − OH), the prepared LSPC showed outstanding selectivity for rapid removal of cationic dyes due to electrostatic affinity. LSPC exhibited great pH responsiveness towards methylene blue adsorption capacity, which increased drastically from 234.19 mg/g to 621.52 mg/g when pH value increased from 2 to 11. Moreover, the LSPC demonstrated excellent regenerated property. On account of its excellent selectivity, strong adsorption capacity, facile regeneration, and great reusability, the lignin-derived sulfonated porous carbon holds great potential towards selective adsorption and recycle of cationic dyes in water treatment field.

近年来，从染料使用行业释放出来的染料废水的存在已成为一个严重的环境问题。吸附被认为是从废水中捕获污染物的有效方法。但是，由于吸附剂的吸附效率，选择性和再生能力有限，因此难以解决普遍存在的染料流出问题。在这项工作中，我们使用Fe ₃ O ₄作为模板剂，通过简便的蚀刻-磺化工艺从玉米秸秆中制备了一种高效，选择性的木质素衍生的磺化多孔碳（LSPC）吸附剂。通过高密度带负电荷的基团（包括-SO _3）获利H，-COOH和酚类-OH），由于静电亲和力，所制备的LSPC具有快速去除阳离子染料的出色选择性。LSPC对亚甲基蓝的吸附能力表现出极大的pH响应性，当pH值从2增加到11时，其从234.19 mg / g急剧增加至621.52 mg / g。此外，LSPC表现出优异的再生性能。木质素衍生的磺化多孔碳具有优异的选择性，强吸附能力，易再生性和可重复使用性，因此在水处理领域对阳离子染料的选择性吸附和再循环具有巨大的潜力。