Moreno-Rivas Silvia Carolina, Ibarra-Gutiérrez María José, Fernández-Quiroz Daniel, Lucero-Acuña Armando, Burgara-Estrella Alexel J, Zavala-Rivera Paul
Department of Chemical Engineering and Metallurgy, University of Sonora, Hermosillo 83000, Mexico.
Department of Physics Research, University of Sonora, Hermosillo 83000, Mexico.
Gels. 2024 Oct 19;10(10):669. doi: 10.3390/gels10100669.
Biosorption, a non-expensive and easy method for removing potentially toxic metal ions from water, has been the subject of extensive research. In this context, this study introduces a novel approach using sodium alginate and chitosan, versatile biopolymers that have shown excellent results as biosorbents. The challenge of maintaining high efficiencies and reuse is addressed by developing alginate/chitosan-based films. These films, prepared using solvent casting and crosslinking methods, form a hydrogel network. The alginate/chitosan-based films, obtained using the eco-friendly polyelectrolyte complex method, were characterized by FTIR, SEM, TGA, and DSC. The study of their swelling pH response, adsorption, and desorption behavior revealed promising results. The adsorption of Pb was significantly enhanced by the presence of both biopolymers (98%) in a shorter time (15 min) at pH = 6.5. The adsorption of both ions followed a pseudo-second-order kinetic and the Langmuir isotherm model. The desorption efficiencies for Cd and Pb were 98.8% and 77.6% after five adsorption/desorption cycles, respectively. In conclusion, the alginate/chitosan-based films present a highly effective and novel approach for removing Cd and Pb from water, with a promising potential for reuse, demonstrating their strong potential in potentially toxic metal removal.
生物吸附作为一种从水中去除潜在有毒金属离子的低成本且简便的方法，一直是广泛研究的主题。在此背景下，本研究引入了一种使用海藻酸钠和壳聚糖的新方法，这两种通用的生物聚合物作为生物吸附剂已显示出优异的效果。通过开发基于海藻酸钠/壳聚糖的薄膜来解决维持高效率和重复使用的挑战。这些薄膜采用溶剂浇铸和交联方法制备，形成水凝胶网络。使用环保型聚电解质复合方法获得的基于海藻酸钠/壳聚糖的薄膜通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、热重分析（TGA）和差示扫描量热法（DSC）进行了表征。对其溶胀pH响应、吸附和解吸行为的研究显示出了有前景的结果。在pH = 6.5时，两种生物聚合物的存在均能在较短时间（15分钟）内显著提高铅的吸附率（98%）。两种离子的吸附均遵循准二级动力学和朗缪尔等温线模型。经过五个吸附/解吸循环后，镉和铅的解吸效率分别为98.8%和77.6%。总之，基于海藻酸钠/壳聚糖的薄膜为从水中去除镉和铅提供了一种高效且新颖的方法，具有良好的重复使用潜力，证明了它们在去除潜在有毒金属方面的强大潜力。
