JINSi-yi,MENGXiao-rong,ZHUJun-feng,et al.Performance of Coupled Electrodeposition of ZIF-8 Doped Polymer Inclusion Membrane for Ag(Ⅰ) Separation[J].China Water & Wastewater,2024,40(23):77-83.
Click Copy

Performance of Coupled Electrodeposition of ZIF-8 Doped Polymer Inclusion Membrane for Ag(Ⅰ) Separation

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第23期 Page: 77-83 Column: Date of publication: 2024-12-01
Author(s):
JIN　Si-yi1;  MENG　Xiao-rong1; 2; 3;  ZHU　Jun-feng1;  HUO　Shan-shan3;  TIAN　Ying-xin1;  LI　Wen-yu1
（1. School of Chemistry and Chemical Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. Key Laboratory of Membrane Separation of Shaanxi Province， Xi’an 710055， China； 3. Xi’an Gold?in Membrane Environmental Protection Technology Co. Ltd.， Xi’an 710055， China）
Keywords:
electrodeposition technology;  separation of Ag(Ⅰ);  polymer inclusion membrane;  ZIF-8;  selectivity
Abstract:
To enhance the purity of low-concentration precious metals recovered from industrial wastewater through electrodeposition, a polymer inclusion membrane (PIM) composed of polyvinyl chloride (PVC) as the base polymer and di(2-ethylhexyl) phosphate (D2EHPA) as the carrier was developed by incorporating positively charged metal-organic frameworks (MOFs) ZIF-8, and its separation and extraction behavior of Ag(Ⅰ) ions were investigated through the coupling of electrodeposition. The microscopic morphology, structure, and interfacial properties of ZIF-8 and ZIF-PD-PIM were characterized using ATR-FTIR, XRD, BET, SEM, and Zeta potential analysis techniques. Using the permeability coefficient of Ag(Ⅰ) as a benchmark, the addition amount of ZIF-8, voltage, and electrode area in the ZIF-PD-PIM system were optimized, and the separation selectivity of Ag(Ⅰ) throughZIF-PD-PIM coupled electrodeposition was subsequently assessed. The distribution of ZIF-8 both on the surface and within PIM was relatively uniform, which significantly enhanced the surface charge of ZIF-PD-PIM and improved the separation selectivity for Ag(Ⅰ). Electrodeposition coupling enhanced the mass transfer rate of PIM. At the optimized voltage of 1.5 V, the separation factor for Ag(Ⅰ) by PD-PIM decreased. However, the permeability coefficient of ZIF-PD-PIM-2Z increased from 6.93 μm/s (without voltage) to 13.67 μm/s (with voltage). The separation factors for Ag(Ⅰ) in relation to Fe(Ⅲ), Zn(Ⅱ), Cu(Ⅱ), and Cd(Ⅱ) rose from 18.09, 3.42, 5.43, and 14.11 (without voltage) to 20.12, 9.82, 11.15, and 15.97 (with voltage) respectively.
Last Update: 2024-12-01