Upadhyay Astha, Alimohammadi Farbod, Tehrani Rouzbeh
Department of Civil and Environmental Engineering, Temple University, Philadelphia, Pennsylvania 19122, United States.
ACS Omega. 2024 Jul 24;9(31):33857-33867. doi: 10.1021/acsomega.4c03583. eCollection 2024 Aug 6.
Chitosan, a cationic natural polysaccharide derived from the deacetylation of chitin, is known for its solubility in diluted acidic solutions, biodegradability, biocompatibility, and nontoxicity. This study introduces three innovative methods for preparing various types of porous chitosan beads: solvent extraction, surfactant extraction, and substance decomposition. These methods involve the integration and subsequent extraction or decomposition of materials during the synthesis process, eliminating the need for additional steps. We used state-of-the-art characterization techniques to analyze and evaluate the chemical and physical properties of the beads, such as Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and three-dimensional (3D) computed tomography (CT) scanning. The 3D CT scans visualized and measured the porosity of different bead types, ranging from 68.4% to 39.3%. This study also evaluated the mechanical properties of the particle beads under compressive forces in both wet and dry conditions, highlighting the influence of porosity on their mechanical integrity and compression pressure behavior. The adsorptive properties of these chitosan beads were studied using methylene blue as a model pollutant, emphasizing the importance of balancing porous structure, surface area, kinetics, and structural integrity. This study paves the way for the development of environmentally sustainable polymeric beads, highlighting the crucial need to balance porosity, surface area, and structural integrity to optimize their effectiveness in real-world applications.
壳聚糖是一种由几丁质脱乙酰化得到的阳离子天然多糖，以其在稀酸溶液中的溶解性、生物降解性、生物相容性和无毒而闻名。本研究介绍了三种制备各种类型多孔壳聚糖珠的创新方法：溶剂萃取法、表面活性剂萃取法和物质分解法。这些方法涉及在合成过程中材料的整合以及随后的萃取或分解，无需额外步骤。我们使用了最先进的表征技术来分析和评估珠子的化学和物理性质，如傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、X射线衍射（XRD）和三维（3D）计算机断层扫描（CT）。3D CT扫描可视化并测量了不同类型珠子的孔隙率，范围从68.4%到39.3%。本研究还评估了颗粒珠在湿态和干态压缩力下的力学性能，突出了孔隙率对其力学完整性和压缩压力行为的影响。以亚甲基蓝作为模型污染物研究了这些壳聚糖珠的吸附性能，强调了平衡多孔结构、表面积、动力学和结构完整性的重要性。本研究为环境可持续聚合物珠的开发铺平了道路，并突出了平衡孔隙率、表面积和结构完整性以优化其在实际应用中的有效性的迫切需求。
