Herein, a novel hydrogel, lignin/carbon dots-embedded cellulose nanofibrils hydrogel (LCCH), was fabricated for doxycycline (DOX) adsorption and determination. The adsorption characteristics of LCCH under various conditions were investigated. According to the Langmuir model fitting results, the maximum capacity of LCCH reached 1686 mg/g. Moreover, it exhibited excellent reusability, with an adsorption capacity maintained above 80.4 % after 5 cycles. Additionally, the LCCH demonstrated stable fluorescence properties, with DOX causing significant quenching of fluorescence attributed to both the internal filtration effect and static quenching. Within the ranges of 10–120 mg/L and 0.2–1.0 μg/L, the fluorescence of LCCH gradually decreased with the increasing concentration of DOX, reaching a limit of detection as low as 0.08 μg/L. Lastly, a cost analysis considering energy consumption and reagent prices demonstrated LCCH's cost-effectiveness as an adsorbent. Overall, this study presents a novel approach for designing and preparing an effective, inexpensive, and versatile hydrogel for the removal of antibiotics.

在此，制备了一种新型水凝胶，即木质素/碳点嵌入的纤维素纳米原纤维水凝胶（LCCH），用于多西环素（DOX）的吸附和测定。研究了不同条件下LCCH的吸附特性。根据Langmuir模型拟合结果，LCCH的最大容量达到1686mg/g。此外，它还表现出优异的可重复使用性，5次循环后吸附容量仍保持在80.4%以上。此外，LCCH 表现出稳定的荧光特性，DOX 由于内部过滤效应和静态猝灭而导致荧光显着猝灭。在10~120mg/L和0.2~1.0μg/L范围内,LCCH的荧光随着DOX浓度的增加而逐渐减弱,检测限低至0.08μg/L。最后，考虑能源消耗和试剂价格的成本分析证明了 LCCH 作为吸附剂的成本效益。总的来说，这项研究提出了一种设计和制备有效、廉价且多功能的水凝胶的新方法，用于去除抗生素。