新型PVC/OHA/D2EHPA基膜增强型聚合物包容膜的制备及性能评价

为解决聚合物包容膜(PIM)传输效率低的问题。制备了一种以聚氯乙烯(PVC)为基体,包含固液两种载体的基膜增强型PIM。以N-羟基正辛酰胺(OHA)作为新型载体固定于基膜孔道内,利用其与有机萃取剂二(2-乙基己基)磷酸酯(D2EHPA)的协同作用,实现高效传质。对制备的基膜增强型PIM进行SEM、EDS、FTIR、XPS、力学性能以及传质性能考察与表征。结果表明,载体配比为22% OHA+17% D2EHPA的基膜增强性PIM对50 mg/L的Zn_²⁺的10h回收效果最佳,萃取率和反萃率分别为59.86%和51.10%。5个周期的运行实验中,基膜增强型PIM初始传质通量为587.36 mg.m_^-2.h_^-1,约是仅包含液相萃取剂PIM传质通量(312.64 mg.m_^-2.h_^-1)的2倍。5个循环周期结束后,基膜增强型PIM传质通量仍高于仅包含液相萃取剂PIM传质通量。

Preparation and performance evaluation of novel PVC/OHA/D2EHPA matrix enhanced polymer inclusion membrane

In order to solve the problem of low transfer efficiency of polymer inclusion membrane. A kind of matrix enhanced PIM using PVC as a polymer backbone as well as containing both solid and liquid carriers was prepared in this work. N-hydroxyn-octanamide (OHA) was employed as a novel carrier to be immobilized in the pore of the matrix, and the synergistic effect of OHA with the organic extractant di (2-ethylhexyl) phosphate ester (D2EHPA) was used to achieve effective mass transfer. The prepared matrix enhanced PIM was investigated and characterized by SEM, EDS, FTIR, XPS, mechanical properties and mass transfer performance. The results showed that the matrix enhanced PIM with a carrier ratio of 22% OHA + 17% D2EHPA was the most effective for the 10h recovery of 50 mg/L Zn_²⁺, with 59.86% and 51.10% extraction and stripping extraction rates, respectively. The initial mass transfer flux of matrix enhanced PIM was 587.36 mg.m_^-2.h_^-1 in five cycles, which was approximately twice that of PIM with only liquid extraction agent (312.64 mg.m_^-2.h_^-1). At the end of 5 cycles, the mass transfer flux of matrix enhanced PIM was still higher than that of PIM with only liquid extraction agent.