Journal article
High-performance dual-channel ratiometric colorimetric sensing of phosphate ion based on target-induced differential oxidase-like activity changes of Ce-Zr bimetal-organic frameworks
Sensors and actuators. B, Chemical, Vol.321, p.128546
10/15/2020
Abstract
•Oxidized UiO-66(Ce/Zr) exhibits oxidase-like activity and specific Pi adsorption.•Pi adsorption brings differential impacts towards different chromogenic substrates.•A dual-channel ratiometric colorimetric assay is established for Pi detection.
Phosphate ion (Pi) is an inorganic anion widely distributed and commonly regarded as a significant indicator of water eutrophication, and thus it is urgent to develop convenient, cost-effective and reliable analytical approaches for the monitoring of Pi for water quality control. In this work, we propose the high-performance dual-channel ratiometric colorimetric sensing of Pi based on the analyte-triggered differential oxidase-mimicking activity changes of oxidized Ce-Zr bimetal-organic frameworks (oxidized UiO-66(Ce/Zr)). By integrating two types of metal nodes with different functions into one framework structure, the proposed oxidized UiO-66(Ce/Zr) not only exhibits excellent activity to catalyze the chromogenic oxidation of both 3,3′,5,5′-tetramethylbenzidine (TMB) and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) due to oxidase-like active Ce4+/Ce3+ sites but also provides main Zr4+ sites to specifically recognize Pi. When Pi is in presence, it is rapidly adsorbed onto oxidized UiO-66(Ce/Zr) and changes the surface chemistry of the latter, leading to differential enzyme-like activity changes towards the two chromogenic substrates TMB and ABTS. Based on this finding, a dual-channel ratiometric colorimetric method was established for the sensitive determination of Pi. Compared to conventional single-signal colorimetric sensors, our method offered a widened linear detection scope from 3.3 to 666.7 μM. Also, robust and accurate analysis of Pi in various water matrices was demonstrated, indicating our method’s great potential in practical applications.
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Details
- Title
- High-performance dual-channel ratiometric colorimetric sensing of phosphate ion based on target-induced differential oxidase-like activity changes of Ce-Zr bimetal-organic frameworks
- Creators
- Xin Li - Jiangsu UniversityXiangheng Niu - Jiangsu UniversityPeng Liu - Jiangsu UniversityXuechao Xu - Jiangsu UniversityDan Du - Washington State UniversityYuehe Lin - Washington State University
- Publication Details
- Sensors and actuators. B, Chemical, Vol.321, p.128546
- Academic Unit
- School of Mechanical and Materials Engineering
- Publisher
- Elsevier B.V
- Identifiers
- 99901227838401842
- Language
- English
- Resource Type
- Journal article