Zhao Xiuxian, Zhao Heng, Mei Anna, Peng Lin, Sun Junhua
School of Materials Science and Engineering, University of Jinan, Jinan 250022, PR China.
Key Laboratory of Nanchang City for Green New Materials and Industrial Wastewater Treatment, School of Ecology and Environment, Yuzhang Normal University, Nanchang 330103, PR China.
Int J Biol Macromol. 2025 Jan;285:138177. doi: 10.1016/j.ijbiomac.2024.138177. Epub 2024 Nov 28.
Green and high-performance biomass-based adsorbents have a good application prospect for the removal of heavy metals. At present, the preparation of chitosan/lignin biomass adsorbents mainly adopts dissolution-drying method, and the obtained adsorbents show relatively poor adsorption performance for heavy metals. To overcome this problem, a novel chitosan/lignin hydrogel (CSL) is prepared by a simple one-pot method through the Mannich reaction. Research findings show that the hydrogels present higher adsorption selectivity for Pb(II) and Cu(II) than other common heavy metals. Among them, the optimal hydrogel CSL1 shows unexpectedly ultrafast adsorption rate for Pb(II) and Cu(II) with equilibrium time of only 1 min and 2 min. Meanwhile, the maximum adsorption capacities of CSL1 for Pb(II) and Cu(II) are 139.86 and 98.71 mg·g, respectively. Compared with the reported adsorption materials related to chitosan or lignin, the CSL1 has the advantages of simple preparation process, considerable adsorption capacity, and short adsorption equilibrium time. Moreover, the adsorption mechanism is investigated by Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), and the results prove that the adsorption mechanism is chemical complexation. This work not only contributes to the advancement of hydrogel-based adsorbents, but also holds significant industrial potential for addressing water pollution issues and promoting sustainable development.
绿色高性能生物质基吸附剂在去除重金属方面具有良好的应用前景。目前，壳聚糖/木质素生物质吸附剂的制备主要采用溶解-干燥法，所得吸附剂对重金属的吸附性能相对较差。为克服这一问题，通过曼尼希反应采用简单的一锅法制备了一种新型壳聚糖/木质素水凝胶（CSL）。研究结果表明，该水凝胶对Pb(II)和Cu(II)的吸附选择性高于其他常见重金属。其中，最优水凝胶CSL1对Pb(II)和Cu(II)表现出意想不到的超快吸附速率，平衡时间仅为1分钟和2分钟。同时，CSL1对Pb(II)和Cu(II)的最大吸附容量分别为139.86和98.71 mg·g。与已报道的壳聚糖或木质素相关吸附材料相比，CSL1具有制备工艺简单、吸附容量可观、吸附平衡时间短等优点。此外，通过傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）研究了吸附机理，结果证明吸附机理为化学络合。这项工作不仅有助于水凝胶基吸附剂的发展，而且在解决水污染问题和促进可持续发展方面具有巨大的产业潜力。
