[1]金思颐,孟晓荣,朱俊锋,等.ZIF-8掺杂聚合物包容膜耦合电沉积分离Ag(Ⅰ)[J].中国给水排水,2024,40(23):77-83.
　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.
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ZIF-8掺杂聚合物包容膜耦合电沉积分离Ag(Ⅰ)

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第40卷 期数: 2024年第23期 页码: 77-83 栏目: 出版日期: 2024-12-01
Title:
Performance of Coupled Electrodeposition of ZIF-8 Doped Polymer Inclusion Membrane for Ag(Ⅰ) Separation
作者:
金思颐1， 孟晓荣1,2,3， 朱俊锋1， 霍姗姗3， 田应昕1， 李文玉1
（1.西安建筑科技大学 化学与化工学院，陕西 西安 710055；2.陕西省膜分离重点实验室，陕西 西安 710055；3.西安金藏膜环保科技有限公司，陕西 西安 710055）
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）
关键词:
电沉积技术;  Ag(Ⅰ)分离;  聚合物包容膜;  ZIF-8;  选择性
Keywords:
electrodeposition technology;  separation of Ag(Ⅰ);  polymer inclusion membrane;  ZIF-8;  selectivity
摘要:
针对电沉积法回收工业废水中低浓度贵金属的纯度问题，在以聚氯乙烯（PVC）为基础聚合物、二（2-乙基己基）磷酸酯（D2EHPA）为载体的聚合物包容膜（PD-PIM）中，引入荷正电性金属有机骨架（MOFs）材料ZIF-8，并耦合电沉积技术研究其对Ag（Ⅰ）的分离和提取行为。采用ATR-FTIR、XRD、BET、SEM和Zeta电位分析技术表征ZIF-8及ZIF-PD-PIM的微观形貌、结构特征及界面性质；以Ag（Ⅰ）的渗透系数为考察指标，优化ZIF-PD-PIM体系中ZIF-8添加量、电压和电极面积，评价ZIF-PD-PIM耦合电沉积技术对Ag（Ⅰ）的分离选择性。结果表明，ZIF-8在PIM表面及内部分布相对均匀，有效提高了ZIF-PD-PIM表面的电荷，强化了Ag（Ⅰ）的分离选择性。电沉积耦合能提高PIM的传质速率，在1.5 V优化电压下，PD-PIM对Ag（Ⅰ）的分离因子下降，但ZIF-PD-PIM-2Z的渗透系数从6.93 μm/s（无电压）提升至13.67 μm/s（有电压），Ag（Ⅰ）相对于Fe（Ⅲ）、Zn（Ⅱ）、Cu（Ⅱ）、Cd（Ⅱ）的分离因子分别由无电压时的18.09、3.42、5.43、14.11提升至20.12、9.82、11.15、15.97。
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.
更新日期/Last Update: 2024-12-01