Efome Johnson E, Rana Dipak, Matsuura Takeshi, Lan Christopher Q
Industrial Membrane Research Institute, Department of Chemical and Biochemical Engineering, University of Ottawa, 161 Louis Pasteur, Ottawa, ON K1N 6N5, Canada.
Industrial Membrane Research Institute, Department of Chemical and Biochemical Engineering, University of Ottawa, 161 Louis Pasteur, Ottawa, ON K1N 6N5, Canada.
Sci Total Environ. 2019 Jul 15;674:355-362. doi: 10.1016/j.scitotenv.2019.04.187. Epub 2019 Apr 14.
The purification process of wastewater containing heavy metal ions (HMIs) using nano-fibrous metal-organic frameworks, MOF-808, embedded polyacrylonitrile membrane has been studied. The process parameters that were evaluated included feed concentration, transmembrane pressure (TMP), and membrane thickness. The effect of coexisting cations in the solution upon the removal efficiencies of Zn, Cd, Pb and Hg ions was also investigated. Results from the filtration experiments indicate a substantial variation in the feed volume that the membrane can treat before the permeate lead concentration reaches the allowable limit of 10 ppb, depending on the process parameter. An increase in the membrane thickness showed a significant improvement (26%) with 440 L of the treated feed volume after doubling the membrane layer. An increase in TMP could reduce the treated feed volume by 38% while a decrease in feed concentration led to a 21% increase in the treated feed volume. In the presence of other common background cations in the solution, the removal efficiency of HMIs by adsorption onto MOF-808 dropped by 18 to 37%. This result was dependent upon the HMIs, in the presence of up to three other cations but was minimal in the presence of a single cation indicative of good selectivity.
研究了使用嵌入纳米纤维金属有机框架MOF-808的聚丙烯腈膜对含重金属离子（HMI）废水的净化过程。评估的工艺参数包括进料浓度、跨膜压力（TMP）和膜厚度。还研究了溶液中共存阳离子对Zn、Cd、Pb和Hg离子去除效率的影响。过滤实验结果表明，根据工艺参数，在渗透液铅浓度达到10 ppb的允许限值之前，膜能够处理的进料体积存在很大差异。膜厚度增加显示出显著改善（26%），膜层加倍后处理的进料体积为440 L。TMP增加会使处理的进料体积减少38%，而进料浓度降低会使处理的进料体积增加21%。在溶液中存在其他常见背景阳离子的情况下，通过吸附到MOF-808上对HMI的去除效率下降了18%至37%。该结果取决于HMI，在存在多达三种其他阳离子的情况下，但在存在单一阳离子时最小，表明具有良好的选择性。
