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Boron/Nitrogen doped carbon quantum dots (BNCQD) was synthesized and its physiochemical and optical properties were investigated by FT-IR, XRD, XPS, TEM and spectroscopic methods. The freshly prepared BNCQD shows a strong green fluorescence at 400 nm excitation, and PO4 anion can readily turn-on the fluorescence of BNCQD through forming stable complex. Then, we designed a turn-on fluorescence sensor for phosphate ion detection which indicate a high selectivity towards PO4 ions in comparison with the other anions with a limit of detection of 0.1 μM. It was approved that BNCQD is highly sensitive and selective to detect PO4 anion in wastewater.

Boron/Nitrogen Co-doped carbon quantum dots as a high sensitive and selective fluorescent sensor for PO43- detection