Preparation of magnetic lignin-based adsorbents and its adsorption properties for dyes

IF 1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Digest Journal of Nanomaterials and Biostructures Pub Date : 2023-09-20 DOI:10.15251/djnb.2023.183.1065

J. Li, S. P. Qiu, H. F. Zhao, D. L. Guo, Z. Y. Yan, J. H. Wu, J. Li

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Abstract

In this study, the renewable magnetic lignin-based material with good properties and environmental friendliness was successfully prepared and used for the treatment of wastewater. Lignin nanospheres (LNS) were prepared from stearyl chloride esterified alkali lignin via self-assembly in the mixture and raspberry-like magnetic lignin microspheres (Fe3O4@SiO2-LNS) was successfully prepared by grafting LNS onto the surface of Fe3O4@SiO2 particles by chemical crosslinking, then was used as absorbent for Methylene blue (MB) and Rhodamine B (RhB) dyes. The results indicated that the Fe3O4@SiO2-LNS had excellent adsorptivity in alkaline solution, and the maximum adsorption capacities for MB and RhB were 258.40 mg·g-1 and 124.38 mg·g-1 , respectively. The Fe3O4@SiO2-LNS adsorbent can be recycled due to its good magnetism and the regeneration efficiency is over 85% after three cycles. Therefore, the prepared magnetic lignin-based adsorbent is a lowcost, high-efficiency and reusable adsorbent for wastewater treatment.

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磁性木质素基吸附剂的制备及其对染料的吸附性能

本研究成功制备了具有良好性能和环境友好性的可再生磁性木质素基材料，并将其用于废水处理。以硬脂酰氯酯化碱木质素为原料，在混合物中自组装制备木质素纳米球(LNS)，通过化学交联将LNS接枝到Fe3O4@SiO2颗粒表面成功制备覆盆子状磁性木质素微球(Fe3O4@SiO2-LNS)，并将其作为亚甲基蓝(MB)和罗丹明B (RhB)染料的吸附剂。结果表明，Fe3O4@SiO2-LNS在碱性溶液中具有良好的吸附性能，对MB和RhB的最大吸附量分别为258.40 mg·g-1和124.38 mg·g-1。Fe3O4@SiO2-LNS吸附剂具有良好的磁性，经三次循环后再生效率可达85%以上。因此，制备的磁性木质素基吸附剂是一种低成本、高效率、可重复使用的废水处理吸附剂。

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