A multi-dye containing MOF for the ratiometric detection and simultaneous removal of Cr2O72- in the presence of interfering ions
- Authors
- Yoo, Jounghyun; Ryu, Unjin; Kwon, Woosung; Choi, Kyung Min
- Issue Date
- Mar-2019
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Molecular dyes/pigments; Metal-organic frameworks; Molecular carrier; Optical sensor; Cr2O72- detection; Cr2O72- removal
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.283, pp 426 - 433
- Pages
- 8
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 283
- Start Page
- 426
- End Page
- 433
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/3763
- DOI
- 10.1016/j.snb.2018.12.031
- ISSN
- 0925-4005
- Abstract
- Among the heavy metals commonly found in wastewater, Cr2O72- is considered the most hazardous due to its high toxicity, carcinogenicity, and mutagenicity. Nevertheless, detection and removal of Cr2O72- remains a serious challenge as it competes with other metal cations and anions in wastewater. Herein, self-calibration of the emission intensities at two different wavelengths was introduced to microporous media to facilitate the ratiometric detection and simultaneous removal of Cr2O72- in the presence of excess interfering ions. Specifically, a multi-dye (7-amino-4-methylcoumarin and resorufin) containing metal-organic framework-801 (Dyes. MOF-801) was developed and tested for the detection and removal of Cr2O72- from wastewater. Dyes. MOF-801 exhibited accurate detection of Cr2O72- with high sensitivity in the presence of a 260-fold excess of potentially interfering ions. Its maximum removal capacity was 83 mg/g and was achieved within 3 min, even in the presence of excess metal ions and 10-fold excess concentrations of anions. In addition, the residual concentration of Cr2O72- was simultaneously checked using ratiometric detection of Dyes. MOF-801, so that the removal of Cr2O72- could be immediately confirmed.
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