Fujian Provincial Key Laboratory of Polymer Materials, College of Material Science and Engineering, Fujian Normal University, Fuzhou 350007, China.
Key Laboratory of Optoelectronic Science and Technology for Medicine of Ministry of Education, Fujian Normal University, Fuzhou 350007, China.
Carbohydr Polym. 2017 Dec 15;178:338-346. doi: 10.1016/j.carbpol.2017.09.051. Epub 2017 Sep 18.
Low temperature thermally induced phase separation (LT-TIPS) of chitosan solution was developed to fabricate porous chitosan membranes (p-CSMs), which were composed of short nanofibers with diameter of 40-60nm. Compared to the conventional acetic acid/water solvent, a mixed solvent of acetic acid/ethanol/water was used to prepare chitosan solution. The effect of solvent composition, quenching temperature and time, and coagulant on the p-CSM morphology were systematically explored. The optimum conditions for fabricating p-CSM was to quench 2% chitosan/2% acetic acid in water/ethanol (70/30) at -20°C for 12h, followed by coagulating in 1% NaCO in water/ethanol (50/50). The p-CSM was an effective adsorbent for Cu and had a Langmuir adsorption capacity of 2.57mmol/g, which is close to the adsorption capacity of natural and electrospun chitosan nanofibers. The p-CSM maintained 90% adsorption efficiency for Cu even after six cycles.
低温热致相分离（LT-TIPS）法制备壳聚糖溶液，制备多孔壳聚糖膜（p-CSMs），该膜由直径为 40-60nm 的短纳米纤维组成。与传统的乙酸/水溶剂相比，本研究采用乙酸/乙醇/水混合溶剂制备壳聚糖溶液。系统地研究了溶剂组成、淬火温度和时间以及凝固浴对 p-CSM 形态的影响。制备 p-CSM 的最佳条件是在-20°C 下将 2%壳聚糖/2%乙酸在水/乙醇（70/30）中淬火 12h，然后在水/乙醇（50/50）中的 1%NaCO 中凝固。p-CSM 是 Cu 的有效吸附剂，具有 2.57mmol/g 的朗缪尔吸附容量，接近天然和静电纺丝壳聚糖纳米纤维的吸附容量。p-CSM 即使经过六次循环，对 Cu 的吸附效率仍保持在 90%。
