Catalyst displacement assay: A supramolecular approach for the design of smart latent catalysts for pollutant monitoring and removal

Cheuk Fai Stephen CHOW, Pui-Yu HO, Wing Leung WONG, Yu-Jing LU, Qian TANG, Cheng-Bin GONG

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Latent catalysts can be tuned to function smartly by assigning a sensing threshold using the displacement approach for targeted analytes. Three cyano-bridged bimetallic complexes were synthesized as “smart” latent catalysts through the supramolecular assembly of different metallic donors [Feᴵᴵ(CN)₆]⁴⁻, [Feᴵᴵ(tBubpy)(CN)₄]²⁻, and Feᴵᴵ(tBubpy)₂(CN)₂ with a metallic acceptor [Cuᴵᴵ(dien)]²⁺. The investigation of both their thermodynamic and kinetic properties on binding with toxic pollutants provided insight into their smart off–on catalytic capabilities, enabling us to establish a threshold-controlled catalytic system for the degradation of pollutants such as cyanide and oxalate. With these smart latent catalysts, a new catalyst displacement assay (CDA) was demonstrated and applied in a real wastewater treatment process to degrade cyanide pollutants in both domestic (level I, untreated) and industrial wastewater samples collected in Hong Kong, China. The smart system was adjusted to be able to initiate the catalytic oxidation of cyanide at a threshold concentration of 20 μM (the World Health Organization’s suggested maximum allowable level for cyanide in wastewater) to the less harmful cyanate under ambient conditions. Copyright © 2017 The Royal Society of Chemistry.
Original languageEnglish
Pages (from-to)3812-3820
JournalChemical Science
Volume8
Issue number5
Early online dateMay 2017
DOIs
Publication statusPublished - 2017

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Cyanides
Assays
Catalysts
Monitoring
Wastewater
Cyanates
Oxalates
Catalytic oxidation
Poisons
Wastewater treatment
Health
Thermodynamics
Degradation
Kinetics

Bibliographical note

Chow, C.-F., Ho, P.-Y., Wong, W.-L., Lu, Y.-J., Tang, Q., & Gong, C.-B. (2017). Catalyst displacement assay: A supramolecular approach for the design of smart latent catalysts for pollutant monitoring and removal. Chemical Science, 8(5), 3812-3820.