He Yuantao, Miao Jing, Chen Shunquan, Zhang Rui, Zhang Ling, Tang Haolin, Yang Hao
Guangdong Key Laboratory of Membrane Materials and Membrane Separation, Guangzhou Institute of Advanced Technology, Chinese Academy of Sciences Nansha District Guangzhou 511458 China
Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology Wuhan 430205 China
RSC Adv. 2019 Feb 4;9(8):4361-4369. doi: 10.1039/c8ra09855g. eCollection 2019 Jan 30.
A positively charged composite hollow fiber nanofiltration (NF) membrane was prepared interfacial polymerization (IP) between chitosan lactate (CL) and trimesoyl chloride (TMC) on a polyether sulfone (PES) hollow fiber ultrafiltration (UF) membrane. The chemical structure and the morphologies of the resultant NF membranes were characterized with attenuated total reflectance-infrared spectroscopy (ATR-IR) and scanning electron microscopy (SEM). The rejection of NF membrane for different inorganic salt aqueous solutions followed the order: MgCl > ZnCl > MgSO > NaCl > NaSO. It suggested that this novel kind of composite hollow fiber NF membrane is positively charged. The molecular weight cut-off (MWCO) was obtained through the rejection of polyethylene glycol (PEG) solutions with different molecular weights ( ). The effect of monomer concentrations, the interfacial polymerization time, and the curing temperature, were investigated, respectively. The rejection and the permeate flux of the resultant composite hollow fiber CL membrane fabricated under the optimal conditions towards a MgCl solution of 1000 ppm were 95.1% and 10.3 L m h, respectively, at 0.4 MPa and 25 °C. Moreover, the effects of operation conditions on the rejection performance of the composite hollow fiber NF membrane were investigated. It suggested that this novel kind of hollow fiber composite nanofiltration membrane based on CL have excellent stability in rejection performances to salt solutions.
通过壳聚糖乳酸盐（CL）与均苯三甲酰氯（TMC）在聚醚砜（PES）中空纤维超滤（UF）膜上进行界面聚合（IP），制备了带正电荷的复合中空纤维纳滤（NF）膜。采用衰减全反射红外光谱（ATR-IR）和扫描电子显微镜（SEM）对所得NF膜的化学结构和形态进行了表征。该NF膜对不同无机盐水溶液的截留率顺序为：MgCl＞ZnCl＞MgSO＞NaCl＞NaSO。这表明这种新型复合中空纤维NF膜带正电荷。通过截留不同分子量的聚乙二醇（PEG）溶液获得截留分子量（MWCO）。分别研究了单体浓度、界面聚合时间和固化温度的影响。在0.4MPa和25℃下，在最佳条件下制备的复合中空纤维CL膜对1000ppm的MgCl溶液的截留率和渗透通量分别为95.1%和10.3L·m⁻²·h⁻¹。此外，研究了操作条件对复合中空纤维NF膜截留性能的影响。结果表明，这种基于CL的新型中空纤维复合纳滤膜对盐溶液的截留性能具有优异的稳定性。
