Concurrent detection and treatment of cyanide contaminated water using mechanosynthesized receptors
Development of receptors that can detect as well as treat cyanide in aqueous sample is an indispensable job for environmental protection. Herein, we present bulk-solvent free and instant green synthesis of a series of turn-on fluorimetric probes that can specifically detect the deadly poison cyanide among various anions and metal ions tested in water. Selective recognition of cyanide by the mechanosynthesized compounds is even observable by the naked eyes, which remained unaffected in presence of various challenging species. NMR spectroscopic investigation supports chemodosimetric sensing of cyanide by the receptors. Remarkable 55-83 fold fluorescence enhancement by the probes could reach limit of detection (LOD) in the range 8-26 ppb, well below the permissible limit of cyanide in drinking water. Being minuscule soluble in water, cyanide treatment studies with the ionophores showed greater than 99 % reduction in free cyanide concentration after three consecutive batches of operation. Furthermore, the compounds can be used as sensitive probes for the estimation of cyanide in human blood serum at physiological condition. Overall, results presented in this article would certainly find great use in the area of cyanide pollution with regard to simultaneous sensing and treatment of free cyanide, which is heretofore unprecedented.