Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (1): 111-120.doi: 10.3866/PKU.WHXB201310313

• SOFT MATTER • Previous Articles     Next Articles

Preparation and Properties of a Novel Hemicellulose-Based Magnetic Hydrogel

LI Ya-Jing, SUN Xiao-Feng, YE Qing, LIU Bai-Chen, WU Yao-Guo   

  1. Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, Northwestern Polytechnical University, Xi'an 710129, P. R. China
  • Received:2013-07-29 Revised:2013-10-29 Published:2014-01-01
  • Contact: SUN Xiao-Feng E-mail:xf001sn@nwpu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20707016), Young Scientist Star Project of Shaanxi Province, China (2012KJXX-10), and Graduate Seed Fund of Northwestern Polytechnical University, China (Z2013154).

Abstract:

Hydrogels are important functional materials with many potential applications. Anovel hemicellulosebased magnetic hydrogel was synthesized using a graft copolymer method, with H2O2-Vc as a redox initiator system to initiate the hemicellulosic derivative and surface-modified Fe3O4 particles as the magnetic component. The structures and morphologies of the prepared magnetic hydrogels were investigated using Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The crystal structure of the modified Fe3O4 particles and the magnetic behaviors of the hemicellulosebased magnetic hydrogels were analyzed using X-ray diffraction (XRD) and a vibration sample magnetometer (VSM), respectively. The results showed that the Fe3O4 particles were well dispersed in the hydrogel matrix and the prepared hydrogels had paramagnetic properties. The effects of the acrylic acid/hemicellulose ratio and the amounts of Fe3O4 particles and cross-linker on the swelling ratio of the hydrogels were studied, and the swelling mechanism of the hydrogels was explored. The swelling behaviors of the hydrogels were simulated using Fickian and Schott kinetic models in a pH 8 buffer solution. The pore size and swelling ratio of the prepared hydrogels increased with increasing the pH value because the ―COOH groups in the hydrogels were converted to ―COO- at higher pH values. In addition, the prepared hydrogels were used to adsorb lysozyme; the adsorption capacity of the magnetic hydrogel was much higher than that of a non-magnetic hydrogel, and the equilibrium adsorption data fitted the Freundlich and Temkin isotherm models well.

Key words: Hemicellulose, Fe3O4, Hydrogel, Swelling kinetics, Lysozyme, Adsorption

MSC2000: 

  • O648