物理化学学报 >> 2014, Vol. 30 >> Issue (1): 111-120.doi: 10.3866/PKU.WHXB201310313

软物质 上一篇    下一篇

新型半纤维素基磁性水凝胶的制备及性能

李亚婧, 孙晓锋, 叶青, 刘柏辰, 吴耀国   

  1. 西北工业大学, 空间应用物理与化学教育部重点实验室, 西安 710129
  • 收稿日期:2013-07-29 修回日期:2013-10-29 发布日期:2014-01-01
  • 通讯作者: 孙晓锋 E-mail:xf001sn@nwpu.edu.cn
  • 基金资助:

    国家自然科学基金(20707016),陕西省青年科技新星项目(2012KJXX-10)及西北工业大学研究生种子基金(Z2013154)资助

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).

摘要:

采用H2O2-Vc氧化还原体系引发半纤维素衍生物,以表面修饰的Fe3O4粒子作为磁性组分,利用接枝共聚方法制备了新型半纤维素基磁性水凝胶. 分别用傅里叶变换红外(FTIR)光谱、X射线光电子能谱(XPS)和扫描电子显微镜(SEM)对水凝胶的结构及形貌进行了表征,利用X射线衍射(XRD)和振动样品磁强计(VSM)对水凝胶的晶型结构及磁性能进行了分析,发现Fe3O4粒子均匀分散在凝胶网络中,半纤维素基磁性水凝胶表现出良好的顺磁性. 考察了丙烯酸/半纤维素比例、Fe3O4粒子含量及交联剂用量对水凝胶溶胀性能的影响,并探讨了该水凝胶的溶胀机理,它在pH 8 缓冲溶液中的溶胀较好符合Fickian 和Schott 动力学模型. 通过SEM和溶胀性能分析表明,随着pH值的升高水凝胶的孔径增大,水凝胶的溶胀率逐渐增大. 制备的水凝胶被用于溶菌酶吸附研究,结果表明磁性凝胶的吸附量大于非磁性水凝胶,水凝胶的吸附行为符合Freundlich 和Temkin 等温模型.

关键词: 半纤维素, Fe3O4, 水凝胶, 溶胀动力学, 溶菌酶, 吸附

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