Xylan derived fluorescence carbon dots composite with cotton cellulose paper as 'turn-off' fluorescence platform for...

The pollution of heavy metals such as Cu²⁺ is still serious and the discharge of sewage of Cu²⁺ will cause damage to soil environment and human health. Herein, a biomass-based solid-state fluorescence detection platform (CPU-CDs) was developed as fluorescent sensor for detection Cu²⁺ via fluorescence and colorimetric dual-model methods in real time. CPU-CDs was composed of xylan-derived CDs (U-CDs) and cotton cellulose paper, which exhibiting good reusability, non-toxicity, excellent fluorescence characteristics and high biocompatibility. Further, CPU-CDs displayed high effectiveness and sensitivity for Cu²⁺ with the detection limit as low as 0.14 μM, which was well below U.S. EPA safety levels (20 μM). Practical application indicated that CPU-CDs could achieve precision response of Cu²⁺ change in real environment water samples with good recovery range of 90 %-119 %. This strategy demonstrated a promising biomass solid-state fluorescence sensor for Cu²⁺ detection for water treatment research, which is of great significance in dealing with water pollution caused by heavy metal ions.