A dual-functional halloysite nanotube-based nanoprobe for the detection and removal of hypochlorite

摘要

Hypochlorite (ClO-) is closely involved in human health and environmental safety. Therefore, it is of vital importance to realize the detection and separation of ClO-. Herein, a nanoprobe with analysis and removal capabilities of ClO- was synthesized via immobilizing coumarin-based functional molecules on halloysite nanotubes. The probe can easily detect ClO- in aqueous solution without the need for organic solvents, showing a fast detection time (10 s), a wide pH range (4-11), a low detection limit (8.4 nM), and a credible recovery rate range of 93.6-105.1%. The probe was further prepared into convenient test papers to realize the visual detection of ClO-. More importantly, it also enabled the removal of ClO-, and the removal rate was as high as 99.6%. @@@ A turn-on fluorescent nanoprobe was developed by grafting a coumarin-based fluorophore onto halloysite nanotubes. This probe can be used for both rapid detection and efficient removal of ClO- in pure aqueous solution.

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