Development of Chitosan Polysaccharide-Based Magnetic Gel for Direct Red 83:1 Removal from Water

IF 5 3区化学 Q1 POLYMER SCIENCE Gels Pub Date : 2024-07-26 DOI:10.3390/gels10080496

Ainoa Murcia-Salvador, M. I. Rodríguez-López, José Antonio Pellicer, T. Gómez-Morte, D. Auñón-Calles, M. Yáñez-Gascón, J. P. Cerón-Carrasco, Á. Gil-Izquierdo, E. Núñez-Delicado, J. A. Gabaldón

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Abstract

Water pollution caused by dyes is a significant environmental issue, necessitating the development of effective, cost-efficient decolorization methods suitable for industrial use. In this study, a Chitosan-Fe polymeric gel was synthesized, characterized, and tested for removing the azo dye Direct Red 83:1 from water. The polymeric magnetic chitosan was analyzed using various techniques: Field Emission Scanning Electron Microscopy (FE-SEM) revealed a porous structure, Differential Scanning Calorimetry (DSC) and Thermal Gravimetric Analysis (TGA) demonstrated the thermal stability, Infrared Spectrophotometry (IR) indicated the successful coordination of iron at the C3 position, and X-ray Powder Diffraction (XRD) confirmed the crystalline nature of the polymeric structure. Optimal conditions for kinetic and isotherm models were found at 1 g and pH 7.0. Adsorption behavior of Direct Red 83:1 onto magnetic chitosan gel beads was studied through kinetic tests and isotherm curves. The maximum adsorption capacity was 17.46 mg/g (qmax). The adsorption process followed pseudo-second-order kinetics (R2 = 0.999) and fit the Temkin isotherm (R2 = 0.946), suggesting heterogeneous surface adsorption. The newly synthesized Chitosan-Fe polymeric gel demonstrated good adsorption properties and facilitated easy separation of purified water.

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开发壳聚糖多糖基磁性凝胶，用于从水中直接去除 83:1 红色素

染料造成的水污染是一个重大的环境问题，因此有必要开发适合工业用途的高效、低成本脱色方法。本研究合成了壳聚糖-锗聚合物凝胶，并对其进行了表征和测试，以去除水中的偶氮染料直接红 83:1。该聚合磁性壳聚糖采用了多种技术进行分析：场发射扫描电子显微镜（FE-SEM）显示了多孔结构，差示扫描量热法（DSC）和热重力分析（TGA）显示了热稳定性，红外分光光度法（IR）显示了铁在 C3 位置的成功配位，X 射线粉末衍射（XRD）证实了聚合物结构的结晶性质。动力学和等温线模型的最佳条件是 1 克和 pH 值为 7.0。通过动力学测试和等温线曲线研究了直接红 83:1 在壳聚糖磁性凝胶珠上的吸附行为。最大吸附容量为 17.46 mg/g（qmax）。吸附过程遵循伪二阶动力学（R2 = 0.999），并与 Temkin 等温线（R2 = 0.946）相吻合，表明表面存在异质吸附。新合成的壳聚糖-铁聚合物凝胶具有良好的吸附性能，易于分离纯水。

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