Microfluidic preparation of magnetic chitosan microsphere and its adsorption towards Congo red

被引:0
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作者
Yipeng Zhang
Daoquan Wang
Xueping Bai
Jianrong Xu
Jianping Zhang
Guoqiang Zhang
Chaozhang Huang
Wen Liu
Chenxi Huang
Xiaopeng Xiong
机构
[1] Xiamen University,Department of Materials Science and Engineering, College of Materials
[2] Technology Center of China Tobacco Fujian Industrial Co.,undefined
[3] Ltd,undefined
来源
Journal of Polymer Research | 2023年 / 30卷
关键词
Chitosan; Microsphere; Magnetic composite; Microfluidic; Adsorption;
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中图分类号
学科分类号
摘要
Facile separation from feed liquid is practically important for application of adsorbents, especially for powdery adsorbents. To this challenge, a co-flow microfluidic device was set up in this work to prepare a magnetic chitosan microsphere without using any surfactant or cross-linking agent. In the microfluidic preparation, a chitosan solution containing Fe2+ and Fe3+ was cut by the shear force of the flow of the continuous phase of isopentanol to form monodispersed droplets, which were introduced into an ammonia aqueous solution bath to obtain the magnetic microspheres. The microstructure of the magnetic chitosan microsphere was carefully characterized, and was compared with that of the neat chitosan microsphere. Our results indicate that the co-precipitated Fe2+ and Fe3+ form in situ magnetite Fe3O4 nanoparticles of 4.6 ± 1.7 nm in the matrix of chitosan, endowing the magnetic chitosan microsphere with superparamagnetic property and with 41.3 emu/g saturation magnetization. In addition, the magnetic chitosan microsphere displays only slight decrease in equilibrium adsorption capacity towards Congo red, but reveals much faster adsorption, when compared with the neat chitosan microsphere. We attribute those to the walnut-like wrinkle surface and high zeta potential of the magnetic chitosan microsphere. Therefore, our work provides a method of preparing even-sized magnetic chitosan microsphere, which can adsorb anionic dye quickly and can be facilely removed from liquid phase after adsorption, implying an excellent adsorbent candidate with great potential.
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