Carbon-quantum dots derived from denatured milk for efficient chromium-ion sensing and supercapacitor applications

We demonstrate here a sustainable approach to generate carbon-quantum dot (CQD) using denatured (spoiled) milk by a simple one-step hydrothermal method. The unique photophysical property of the CQD has resulted in selective sensing of the chromium ions (Cr6+) as low as 14 mu M in control and environmental water samples. The CQD electrode delivered a specific capacitance of 95 F g(-1) with an exceptional stability over 1000 cycles. (C) 2019 Elsevier B.V. All rights reserved.