In this paper, carbon quantum dots (S-N-CDs) containing sulfur and nitrogen were synthesized using citric acid and thiourea. The average particle size of N-S-CDs is 8nm. The N-S-CDs surface contains various of functional groups, which has good water solubility. The uorescence quantum yield of N-S-CDs is as high as 36.8%. N-S-CDs emits strong blue uorescence in aqueous solution and has good photostability in neutral and alkaline Nacl solution. N-S-CDs has unique selectivity and high sensitivity to Fe 3+ and Hg 2+ ions, and the lowest detection limits are 1.4μM and 0.16μM, respectively. Under the interference of other metal ions, Fe 3+ and Hg 2+ ions can still effectively and stably quench the uorescence of N-S-CDs. In addition, in the detection of actual samples, N-S-CDs can effectively detect Fe 3+ and Hg 2+ ions in tap water and lake water.

The development of high-efficiency photocatalytic materials responsive to visible light is one of the most effective ways to address the environmental threats posed by organic dyes in industrial wastewater. In...

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