Zhang Jianjuan, Ren Huiyun, Fan Honglei, Zhou Shaofeng, Huang Jin
School of Environment and Safety Engineering, School of Chemistry and Chemical Engineering, School of Materials Science and Engineering, North University of China, Taiyuan 030051, China.
Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
Molecules. 2023 Oct 15;28(20):7100. doi: 10.3390/molecules28207100.
Recently, the natural polymer polysaccharide konjac glucomannan (KGM) has received attention as a promising adsorbent in water treatment due to its low toxicity, cost-effectiveness and biocompatibility. However, the high-level water absorbency of KGM makes it difficult to recover in water treatment. In this study, by combining KGM with magnetic nanoparticles, KGM-based magnetic nanoparticles (KGM-FeO NPs) with excellent adsorption properties and recyclability for heavy metals were prepared using an one-step precipitation method. The as-prepared KGM-FeO NPs have a spherical morphology of superparamagnetism with a small particle size (ca. 7.0 nm) and a large specific surface area (160.1 m·g). Taking Cr(VI) as the target heavy metal ion, the above nanoparticles have a high adsorption capacity and fast adsorption rate for Cr(VI). The pseudo-second order kinetic model is more suitable to describe the adsorption process of Cr(VI) by KGM-FeO NPs, and the maximum adsorption capacity of Cr(VI) onto KGM-FeO NPs was calculated to be 41.67 mg·g using the Langmuir isotherm model. In addition, KGM-FeO NPs with adsorbed heavy metal ions can be quickly recovered from a solution, regenerated, and reused in the next cycle. KGM-based FeO nanoparticles are promising adsorbents that show significant reusability for the removal of metal ions in water and wastewater treatment.
近年来，天然聚合物多糖魔芋葡甘聚糖（KGM）因其低毒性、成本效益和生物相容性，作为一种有前景的水处理吸附剂受到关注。然而，KGM的高吸水性使其在水处理中难以回收。在本研究中，通过将KGM与磁性纳米颗粒相结合，采用一步沉淀法制备了对重金属具有优异吸附性能和可回收性的KGM基磁性纳米颗粒（KGM-FeO NPs）。所制备的KGM-FeO NPs具有超顺磁性的球形形态，粒径小（约7.0 nm），比表面积大（160.1 m·g）。以Cr(VI)作为目标重金属离子，上述纳米颗粒对Cr(VI)具有高吸附容量和快速吸附速率。准二级动力学模型更适合描述KGM-FeO NPs对Cr(VI)的吸附过程，使用Langmuir等温线模型计算得出KGM-FeO NPs对Cr(VI)的最大吸附容量为41.67 mg·g。此外，吸附了重金属离子的KGM-FeO NPs可以从溶液中快速回收、再生，并在下一个循环中重复使用。KGM基FeO纳米颗粒是有前景的吸附剂，在水和废水处理中对金属离子的去除显示出显著的可重复使用性。
