MXene-derived Ti3C2 quantum dots-based ratiometric fluorescence probe for ascorbic acid and acid phosphatase determination

•The synthesized MXene QDs with bright blue fluorescence were used to construct a novel ratiometric fluorescence biosensor.•This ratiometric approach was easy-to-operate, less time-consuming and showed satisfactory sensitivity to AA and ACP.•The ratiometric fluorescence probe exhibited profuse color variation and had great potential for visual detection.