▎ 摘　　要

NOVELTY - A crown ether metal organic framework composition comprises a porous metal organic framework structure having a surface (s1) with a pore window (a) and a surface (s2) with a pore window (b) and a channel therebetween. The metal organic framework structure is functionalized by one or more crown ether structures contained within or on the channel. The MOF structure comprises a material chosen from UiO-66, ZIF-7, ZIF- 8, MIL-121, ZJU-24, NU-125-isophthalate, and NU-125-benzenetricarboxylic acid. The crown ether structure comprises a compound chosen from 12-crown-4, 15-crown-5, 18-crown-6, 21-crown-7, 24-crown-8, 27-crown-9, and 30-crown-10. USE - Crown ether metal organic framework composition used for ion separation or transport membrane for membrane module for ion separation or transport membrane system for separating ions in liquid media (all claimed) for efficient mineral separation, water purification, and energy conversion. ADVANTAGE - The composition provides the ion separation membrane having desired mechanical properties and desired ion transport or capture properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) ion separation or transport membrane, which comprises the crown ether functionalized metal organic framework structure comprising surface (s1) and (s2), and one or more ion transport channels between respective pore windows in the surfaces. The ion transport channels contain one or more crown ethers; (2) membrane module for ion separation or transport membrane system, which comprises the crown ether modified metal organic framework structure comprising surfaces (s1) and (s2), and ion transport channels between respective pore windows in the surfaces. he ion transport pore channels include one or more crown ethers; (3) method for separating ions in a liquid media, which involves exposing a liquid media containing ions to surface (s1) of the ion separation membrane and applying a trans-membrane bias voltage to transport ions into a pore window in the surface (s1), through the ion transport channel, and out of a pore window in a surface (s2); and (4) formation of ion separation membrane or the membrane module, which involves coupling crown ethers to at least internal surfaces of an ion transport channel between respective pore windows in surfaces (s1) and (s2) of the metal organic framework structure.