膜
再生纤维素
纤维素
水溶液
傅里叶变换红外光谱
差示扫描量热法
化学工程
化学
吸附
硫脲
细菌纤维素
膜结构
聚合物
高分子化学
核化学
材料科学
色谱法
有机化学
生物化学
物理
工程类
热力学
作者
Xiaopeng Xiong,Jiangjiang Duan,Wewei Zou,Xumin He,Wei Zheng
标识
DOI:10.1016/j.memsci.2010.07.031
摘要
Cellulose dissolved in 6/5 wt% NaOH/thiourea aqueous solution was regenerated from chitosan (CS) acetic acid solution. Differential scanning calorimetry measurement suggested that the obtained membrane was cellulose/CS hybrid, in which the CS content was determined by elemental analysis to be very low. From the results of Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron micrograph analyses, the CS chains were found to distribute in the surface layer of the regenerated cellulose membrane and to entangle with cellulose molecules due to the interactions between the two polymers. The hybrid membrane revealed much denser homogeneous porous structure than that of the pure regenerated cellulose membrane, resulting in the improvement in strength of the hybrid membrane. An application of the hybrid membrane in a membrane process showed that the water flux did not decrease too much despite of the impregnation of CS, while the membrane exhibited a high rejection of Cu2+ at pH = 5 due to the amino groups in the impregnated CS molecules. The rejection mechanism of the hybrid membrane was analyzed to be the combination of nanofiltration and complexation of Cu2+ with amino groups. When pH of the feed solution in a membrane process was changed, the ion rejection varied accordingly, showing the pH sensitivity of the hybrid membrane. Thus, the research provides a very simple way to prepare pH sensitive regenerated cellulose membrane, which might have potential applications in the fields of separation and adsorption.
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