Beschreibung:
Pollutants including dyes usually coexist with cations in effluent. Effective removal of these contaminants from wastewater has received extensive concern. Herein, we develop a novel nanotubular material functionalized with crown ether groups as an efficient adsorbent for pollutant treatment. Organic nanotubes are constructed from N , N ', N ''-(3-methylpyridine) benzenetriamide via supramolecular self-assembly and further functionalized with 18-crown-6 groups to obtain crown-ether-functionalized nanotubes (TMPTA-tube-ce). Due to the unique cavity structure, positively charged pyridinium groups and especially favorite crown ether-cation host-guest interactions, TMPTA-tube-ce exhibits superior synergistic adsorption ability towards anionic dyes in the presence of cations. Its maximum adsorption capacity for methyl orange is remarkably improved to 802 mg g -1 (pH = 6 and 25 °C) in the presence of K + . Similarly, the adsorption of bisphenol A and p -nitrophenol is improved up to 106 and 98 mg g -1 , respectively, in the presence of K + . Notably, the adsorption efficiency of TMPTA-tube-ce is not significantly reduced after 5 cycles, implying that the as-synthesized adsorbent has potential application in practical wastewater treatment. This work shows that materials’ adsorption performance may be greatly improved via host-guest interactions in complex wastewater systems