Zou Ming, Zhang Hongfei, Zhang Haixin, Miyamoto Naoto, Kano Naoki
Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-Nocho, Nishi-ku, Niigata 950-2181, Japan.
College of Materials Science and Engineering, Qiqihar University, Wenhua Street, Qiqihar 161006, China.
ACS Omega. 2025 Jun 18;10(25):26901-26912. doi: 10.1021/acsomega.5c01926. eCollection 2025 Jul 1.
This study explores the removal of the anionic surfactant sodium dodecylbenzenesulfonate (SDBS) from aqueous solution using paper fibers functionalized with quaternary ammonium groups. The paper fibers used in the adsorbent were derived from waste paper, and under alkaline conditions, the quaternary ammonium groups were grafted onto the hydroxyl groups on the cellulose 6 position via the Williamson reaction, thereby producing cationic cellulose. Through the characterization of modifier, we confirmed that the product was a dodecyl dimethyl quaternary ammonium salt. The successful modification of the paper fibers by a quaternary ammonium salt was confirmed by analyzing the structural characteristics of the fibers before and after modification. The modification rate was about 36.6%. The results of the adsorption experiment with SDBS solution showed that compared with unmodified paper fibers, the adsorption capacity of modified paper fibers for SDBS increased by about 8 times and the SDBS removal rate was 97.6%. The optimal adsorption conditions were pH 7, an adsorbent input of 0.3 g, and a shaking time of 6 h. It was determined that the adsorption process was more consistent with pseudo-second-order adsorption kinetics, and the Langmuir adsorption isotherm equation indicated that the adsorption process was monolayer adsorption, with a maximum capacity reaching 90.9 mg/g. Finally, thermodynamic analysis showed that adsorption occurred spontaneously and exothermically.
本研究探索了使用季铵化功能化的纸纤维从水溶液中去除阴离子表面活性剂十二烷基苯磺酸钠（SDBS）的方法。吸附剂中使用的纸纤维来源于废纸，在碱性条件下，通过威廉姆森反应将季铵基团接枝到纤维素6位的羟基上，从而制备出阳离子纤维素。通过对改性剂的表征，我们确认产物为十二烷基二甲基季铵盐。通过分析改性前后纤维的结构特征，证实了纸纤维成功地被季铵盐改性。改性率约为36.6%。SDBS溶液的吸附实验结果表明，与未改性的纸纤维相比，改性纸纤维对SDBS的吸附容量提高了约8倍，SDBS去除率为97.6%。最佳吸附条件为pH值7、吸附剂投加量0.3 g、振荡时间6 h。结果表明，吸附过程更符合准二级吸附动力学，朗缪尔吸附等温线方程表明吸附过程为单层吸附，最大吸附容量达到90.9 mg/g。最后，热力学分析表明吸附是自发且放热的。
