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首页> 外文期刊>RSC Advances >Preparation and characterization of a novel positively charged composite hollow fiber nanofiltration membrane based on chitosan lactate
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Preparation and characterization of a novel positively charged composite hollow fiber nanofiltration membrane based on chitosan lactate

机译：壳聚糖乳酸新型带正电复合中空纤维纳滤膜的制备与表征

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A positively charged composite hollow fiber nanofiltration (NF) membrane was prepared via 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 _(2) > ZnCl _(2) > MgSO _(4) > NaCl > Na _(2) SO _(4) . 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 ( M _(w) ). 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 _(2) solution of 1000 ppm were 95.1% and 10.3 L m ~(?2) h ~(?1) , 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.
机译：在聚醚砜（PES）中空纤维超滤（UF）膜上，通过壳聚糖乳酸（CL）和均苯三甲酰氯（TMC）之间的界面聚合（IP）制备带正电的复合中空纤维纳滤（NF）膜。通过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。对于不同的无机盐水溶液，NF膜的截留顺序为：MgCl_（2）> ZnCl_（2）> MgSO_（4）> NaCl> Na_（2）SO_（4）。这表明这种新型的复合中空纤维NF膜带正电。截留分子量（MWCO）是通过排除具有不同分子量（M _（w））的聚乙二醇（PEG）溶液而获得的。分别研究了单体浓度，界面聚合时间和固化温度的影响。在最佳条件下制备的复合中空纤维CL膜对1000 ppm MgCl _（2）溶液的截留率和透过通量分别为95.1％和10.3 L m〜（？2）h〜（？1）。 ，在0.4 MPa和25°C下。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。这表明这种新型的基于CL的中空纤维复合纳滤膜在对盐溶液的排斥性能方面具有优异的稳定性。

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