The novel sulfomethylated lignin-grafted-polyacrylic acid (SL-g-PAA) hydrogel was fabricated in this work via a facile and green synthetic strategy for the efficient removal of heavy metal ions from wastewater, and then successively reused for chemiluminescence (CL). The sulfomethylation of lignin was first performed to improve its water solubility and introduce numerous active sites for adsorption of heavy metal ions. The as-synthesized SL-g-PAA hydrogel with high content of lignin exhibited the highly efficient and rapid removal of various metal ions from simulated wastewater. More importantly, the spent hydrogel (M²⁺@SL-g-PAA) after adsorption was reused for the first time to develop a new CL system by an ingenious strategy, in which these metal ions adsorbed on M²⁺@SL-g-PAA act as heterogeneous catalytic sites to catalyze the CL reaction between N-(4-aminobutyl)-N-ethylisoluminol (ABEI) and H₂O₂. The resultant CL system displayed high CL intensity and long duration time, which could be observed by naked eye in the dark and lasted for > 24 h. The combination of facile fabrication process, renewable raw materials, and ingenious strategy for successive application in adsorption and CL endows this lignin-based composite hydrogel with a great potential for application in wastewater treatment, biological imaging and cold light sources.

在这项工作中，通过一种简便、绿色的合成策略制备了新型磺甲基化木质素接枝聚丙烯酸（SL-g-PAA）水凝胶，用于有效去除废水中的重金属离子，然后连续重复用于化学发光（CL）。首先进行木质素的磺甲基化以提高其水溶性并引入许多用于吸附重金属离子的活性位点。合成的具有高木质素含量的 SL-g-PAA 水凝胶表现出高效、快速地去除模拟废水中的各种金属离子。更重要的是，吸附后的废水凝胶（M ²⁺ @SL-g-PAA）首次被重复利用，通过巧妙的策略开发了一种新的CL系统，其中这些金属离子吸附在M ^{2+ 上。}@SL-g-PAA 作为多相催化位点催化 N-(4-氨基丁基)-N-乙基异鲁米诺 (ABEI) 和 H ₂ O ₂之间的 CL 反应。由此产生的 CL 系统显示出高 CL 强度和长持续时间，这可以在黑暗中用肉眼观察并持续 > 24 小时。简便的制造工艺、可再生的原材料以及在吸附和 CL 中连续应用的巧妙策略，使这种基于木质素的复合水凝胶在废水处理、生物成像和冷光源方面具有巨大的应用潜力。