Heavy metal ions not only harm living organisms in water, but also affect the health of humans ( Lu et al., 2018 Bolisetty et al., 2019 Sarma et al., 2019 Wu et al., 2019). With the development of industrialization, the pollution of the environment with heavy metal ions has become a serious concern all over the world. Therefore, these biocompatible CDs may serve as a promising candidate for the specific detection of Hg 2+. More importantly, even in the presence of interfering metal ions, the detection of Hg 2+ using the CDs-4a remained stable. The fluorescence intensity of CD-4a exhibited a two-stage, concentration-dependent fluorescence response in the range 0.2–10 and 10–100 μmol/L Hg 2+, with each stage having different slopes the detection limit was 0.2 μM. Thus, CD-4a may be used as a fluorescence sensor for the detection of Hg 2+.
The fluorescence of the CDs, especially for the smallest, CD-4a, was significantly quenched in the presence of the heavy metal ion, Hg 2+. In addition, doping with elements (N) also effectively enhanced the fluorescent performance of the CDs.
When the particle size decreased from 8.72 to 2.11 nm, the fluorescence quantum yield increased from 0.029 to 0.183. The CDs exhibit excellent fluorescence and biocompatibility.
#Cd pbs cut off wavelength series
In this work, using different pretreatment methods, a series of carbon dots (CDs) with different particle sizes and doped with varying amounts of elements (O, N, S) were prepared based on the natural polymer, cellulose hydrogel. Simple and effective strategies for the specific detection of heavy metal ions are of great important. Heavy metal ions overload can seriously harm human health. School of Physics and Electronic Science & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai, China.Hailong Huang, Hao Ge, Zhipeng Ren, Zhijian Huang, Min Xu * and Xianghui Wang *
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