Sheraz Muhammad, Sun Xiao-Feng, Wang Yongke, Siddiqui Adeena, Chen Jiayi, Sun Le
Research Centre of Advanced Chemical Engineering, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China.
Shenzhen Research Institute, Northwestern Polytechnical University, Shenzhen 518063, China.
Polymers (Basel). 2024 Dec 11;16(24):3460. doi: 10.3390/polym16243460.
In this study, the fabrication of magnetic hemicellulosic composite microspheres and the adsorption of copper ions are explored. The microspheres were prepared by the micro-emulsion technique, using FeO nanoparticles and hemicellulose extracted from wheat straw with the ionic liquid B[mim]Cl as a solvent. FeO nanoparticles, synthesized through coprecipitation, were evenly encapsulated within the hemicellulosic microspheres. The FeO nanoparticles measured 10-15 nm in size, while the microspheres had an average diameter of about 20 μm and displayed a saturation magnetization of 35.95 emu/g. The optimal conditions for copper adsorption by the microspheres were found to be a pH of 5.0, a temperature of 323 K, and an initial copper ion concentration of 80 mg/L, resulting in an adsorption capacity of 85.65 mg/g after 24 h. The adsorption kinetics followed a pseudo-second-order model, and the Langmuir isotherm suggested a monomolecular layer adsorption mechanism, with a theoretical maximum capacity of 149.25 mg/g. In summary, the magnetic hemicellulosic microspheres exhibited considerable adsorption potential and favorable recycling capabilities for copper ions.
在本研究中，探索了磁性半纤维素复合微球的制备及其对铜离子的吸附性能。微球通过微乳液技术制备，使用FeO纳米颗粒和以离子液体B[mim]Cl为溶剂从麦秸中提取的半纤维素。通过共沉淀法合成的FeO纳米颗粒被均匀地包裹在半纤维素微球内。FeO纳米颗粒的尺寸为10 - 15 nm，而微球的平均直径约为20μm，饱和磁化强度为35.95 emu/g。发现微球吸附铜的最佳条件为pH值5.0、温度323 K和初始铜离子浓度80 mg/L，24小时后吸附容量为85.65 mg/g。吸附动力学遵循准二级模型，Langmuir等温线表明为单分子层吸附机制，理论最大容量为149.25 mg/g。总之，磁性半纤维素微球对铜离子表现出可观的吸附潜力和良好的循环利用能力。
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