Issue 24, 2020

Enhanced chemical sensing for Cu2+ based on composites of ZIF-8 with small molecules

Abstract

Two organic molecules, pyridoxal hydrazide (PAH) and salicylaldehyde based Rhodamine B hydrazone (RBS) were integrated into zeolitic imidazolate framework-8 (ZIF-8) to give composites, namely PAH/ZIF-8 and RBS/ZIF-8. The organic molecules and ZIF-8 are proposed to be assembled via hydrogen bonds and π–π stacking in the composites. The mass fraction of PAH and RBS in the composites was calculated to be 21.86% and 29.3%. The fluorescence of PAH/ZIF-8 is quenched regularly by Cu2+. The detection limit for Cu2+ was calculated to be 1.42 nM for PAH/ZIF-8, which is one order of magnitude lower than that of PAH. The detection limit for Cu2+ was determined to be 0.8 μM for RBS/ZIF-8, which is three times lower than that of RBS. The two composites both display high selectivity to Cu2+ over competing metal ions. The PAH/ZIF-8 fluorescent sensor was successfully applied to Cu2+ determination in environmental water. PAH/ZIF-8 exhibits excellent cell membrane permeability and low cytotoxicity in cellular imaging. The enhanced chemical sensor was designed by introducing small molecules into ZIF-8 for the specific recognition of Cu2+.

Graphical abstract: Enhanced chemical sensing for Cu2+ based on composites of ZIF-8 with small molecules

Supplementary files

Article information

Article type
Paper
Submitted
19 Dec 2019
Accepted
23 Mar 2020
First published
07 Apr 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 13998-14006

Enhanced chemical sensing for Cu2+ based on composites of ZIF-8 with small molecules

J. Zhang, X. Zhao, X. Liu and C. Dong, RSC Adv., 2020, 10, 13998 DOI: 10.1039/C9RA10695B

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