Hu Fang, Huang Yifa, Huang Yanting, Tang Junming, Hu Jiugang
School of Resource Environment and Safety Engineering, University of South China, Hengyang 421000, China.
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
Membranes (Basel). 2023 May 24;13(6):550. doi: 10.3390/membranes13060550.
A unique facilitation on the transport flux of Cu(II) was investigated by using modified polymer inclusion membranes (PIMs). LIX84I-based polymer inclusion membranes (LIX-based PIMs) using poly(vinyl chloride) (PVC) as support, 2-nitrophenyl octyl ether (NPOE) as plasticizer and Lix84I as carrier were modified by reagents with different polar groups. The modified LIX-based PIMs showed an increasing transport flux of Cu(II) with the help of ethanol or Versatic acid 10 modifiers. The metal fluxes with the modified LIX-based PIMs were observed varying with the amount of modifiers, and the transmission time was cut by half for the modified LIX-based PIM cast with Versatic acid 10. The physical-chemical characteristics of the prepared blank PIMs with different Versatic acid 10 were further characterized by using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), contract angle measurements and electro-chemical impedance spectroscopy (EIS). The characterization results indicated that the modified LIX-based PIMs cast with Versatic acid 10 appeared to be more hydrophilic with increasing membrane dielectric constant and electrical conductivity that allowed better accessibility of Cu(II) across PIMs. Hence, it was deduced that hydrophilic modification might be a potential method to improve the transport flux of the PIM system.
通过使用改性聚合物包容膜（PIMs），研究了对Cu(II)传输通量的一种独特促进作用。以聚氯乙烯（PVC）为支撑体、2-硝基苯基辛基醚（NPOE）为增塑剂、Lix84I为载体的基于LIX84I的聚合物包容膜（基于LIX的PIMs）被具有不同极性基团的试剂改性。改性后的基于LIX的PIMs在乙醇或Versatic酸10改性剂的帮助下，Cu(II)的传输通量增加。观察到改性后的基于LIX的PIMs的金属通量随改性剂用量而变化，用Versatic酸10浇铸的改性基于LIX的PIMs的传输时间缩短了一半。通过衰减全反射傅里叶变换红外光谱（ATR-FTIR）、接触角测量和电化学阻抗谱（EIS）进一步表征了用不同量Versatic酸10制备的空白PIMs的物理化学特性。表征结果表明，用Versatic酸10浇铸的改性基于LIX的PIMs随着膜介电常数和电导率的增加显得更亲水，这使得Cu(II)能更好地穿过PIMs。因此，推断亲水改性可能是提高PIM系统传输通量的一种潜在方法。
