Xylan derived carbon dots composite with cotton cellulose paper as fluorescence sensor for real time detection Cu2+

Abstract

Abstract Cotton cellulose paper composited with fluorescence carbon dots (CDs) has shown potential for Cu2+ detection in environmental monitoring. In this study, a solid-state detection platform was developed using biomass-based fluorescent sensors (CPU-CDs) composed of xylan-derived CDs (U-CDs) and cotton cellulose paper. The fluorescence platform was nanoengineered to monitor Cu2+ changes via spectral and colorimetric dual-modal methods. CPU-CDs exhibits reusability, non-toxicity, excellent fluorescence characteristics and biocompatibility. Besides, CPU-CDs has a complex network structure and a large number of hydroxyl and amino groups, which can realize a high loading rate of U-CDs and provide more binding sites for the detection and response of Cu2+. CPU-CDs displays high effectiveness and sensitivity for Cu2+. Additionally, the detection limit of CPU-CDs for Cu2+ as low as 0.14 μM that was well below U.S. EPA safety levels (20 μM). Practical application indicated that CPU-CDs could achieve precision response of Cu2+ change in water environment with recovery range of 90%-119%. This strategy demonstrated a promising biomass solid-state fluorescence sensor for Cu2+ detection for water treatment research.