Journal
CRYSTENGCOMM
Volume 23, Issue 7, Pages 1677-1683Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ce01802c
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Funding
- National Natural Science Foundation of China (NSFC) [21671114, U1904199]
- National Basic Research Program (973 Program) [2014CB660804]
- Young Backbone Teachers Fund of Henan [2018GGJS119]
- Scientific Research and Service Platform Fund of Henan Province [2016151]
- Fund of Scientific and Technological Innovation Team of Water Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province
- Nanyang Normal University
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In this study, two high-performance fluorescent materials were developed for detecting Fe(III) and chromate ions in water with high sensitivity, fast response, high selectivity, and excellent stability. The detection limits were far below the maximum standard defined by the United States Environmental Protection Agency (EPA) for drinking water.
Developing high-performance fluorescent materials to detect toxic contaminants in water is of great importance due to heavy metal pollution which has aroused wide public concern. Herein, two robust lanthanide metal-organic frameworks {[Ln(L)(H2O)]center dot 7H(2)O)(n) (1-Ln; Ln = Eu and Tb. H3L = 5-(3',5'-dicarboxylphenyl)picolinic acid) were successfully constructed and structurally characterized. 1-Eu and 1-Tb are isomorphic and feature a three-dimensional highly porous pillared-layer framework. Notably, both 1-Eu and 1-Tb demonstrate good luminescence performance, and excellent water, thermal and chemical stability. Then, 1-Eu and 1-Tb were further utilized as multi-responsive fluorescent sensors for detection of Fe(III) and chromate ions in water with high sensitivity, fast response, high selectivity and excellent recycling usability. The detection limits toward Fe3+/CrO42-/Cr2O72- are calculated to be 0.67/0.53/0.32 mu M for 1-Eu and 126/0.75/0.57 mu M for 1-Tb, respectively, which are far below the maximum standard defined by the United States Environmental Protection Agency (EPA) for drinking water. Furthermore, the quenching mechanisms can be explained as the synergetic effect of the competitive absorption and energy-transfer between 1-Eu/1-Tb host and analyte ions.
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