Căprărescu Simona, Modrogan Cristina, Purcar Violeta, Dăncilă Annette Madelene, Orbuleț Oanamari Daniela
Inorganic Chemistry, Physical Chemistry and Electrochemistry Department, Faculty of Applied Chemistry and Materials Science, University POLITEHNICA of Bucharest, 1-7 Polizu Str., 011061 Bucharest, Romania.
Analytical Chemistry and Environmental Engineering Department, Faculty of Applied Chemistry and Materials Science, University POLITEHNICA of Bucharest, 1-7 Polizu Str., 011061 Bucharest, Romania.
Polymers (Basel). 2021 Jun 4;13(11):1875. doi: 10.3390/polym13111875.
The main goal of the present paper was to synthesize the polyvinyl alcohol-SiO nanoparticles polymeric membrane by wet-phase inversion method. The efficiency of prepared membranes (without and with SiO) was investigated using a versatile laboratory electrodialysis system filled with simulated wastewaters that contain zinc ions. All experiments were performed at following conditions: the applied voltage at electrodes of 5, 10 and 15 V, a concentration of zinc ions solution of 2 g L, time for each test of 1 h and at room temperature. The demineralization rate, extraction percentage of zinc ions, current efficiency and energy consumption were determined. The polymeric membranes were characterized by Fourier Transforms Infrared Spectroscopy-Attenuated Total Reflection (FTIR-ATR), Scanning Electron Microscopy (SEM) and Electrochemical Impedance Spectroscopy (EIS). The higher value of percentage removal of zinc ions (over 65%) was obtained for the polymeric membrane with SiO nanoparticles, at 15 V. The FTIR-ATR spectra show a characteristic peak located at ~1078 cm assigned to the Si-O-Si asymmetrical stretching. SEM images of the polymeric membrane with SiO nanoparticles show that the nanoparticles and polymer matrix were well compatible. The impedance results indicated that the SiO nanoparticles induced the higher proton conductivity. The final polymeric membranes can be used for the removal of various metallic ions, dyes, organic or inorganic colloids, bacteria or other microorganisms from different natural waters and wastewaters.
本文的主要目标是通过湿相转化法合成聚乙烯醇-SiO纳米颗粒聚合物膜。使用装有含锌离子模拟废水的通用实验室电渗析系统，研究了制备的膜（不含和含SiO）的效率。所有实验均在以下条件下进行：电极施加电压为5、10和15 V，锌离子溶液浓度为2 g/L，每次测试时间为1 h，且在室温下。测定了脱盐率、锌离子萃取率、电流效率和能耗。通过傅里叶变换红外光谱-衰减全反射（FTIR-ATR）、扫描电子显微镜（SEM）和电化学阻抗谱（EIS）对聚合物膜进行了表征。含SiO纳米颗粒的聚合物膜在15 V时获得了更高的锌离子去除率（超过65%）。FTIR-ATR光谱显示在~1078 cm处有一个特征峰，归属于Si-O-Si不对称伸缩振动。含SiO纳米颗粒的聚合物膜的SEM图像表明纳米颗粒与聚合物基体相容性良好。阻抗结果表明SiO纳米颗粒诱导了更高的质子传导率。最终的聚合物膜可用于从不同天然水和废水中去除各种金属离子、染料、有机或无机胶体、细菌或其他微生物。
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