Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China.
Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, China.
Talanta. 2021 Feb 1;223(Pt 1):121712. doi: 10.1016/j.talanta.2020.121712. Epub 2020 Sep 30.
Black phosphorus quantum dots (BP QDs) were prepared through a solvothermal exfoliation method in alkaline N-methyl-2-pyrrolidinone. The BP QDs induce distinct chemiluminescence (CL) of alkaline luminol directly. A possible reaction mechanism is proposed by the study of CL spectrum, ultraviolet-visible absorption spectra, electron paramagnetic resonance spectra as well as radical scavenging experiments. The presence of BP QDs significantly increases generation of active oxygen species, which oxidize luminol and lead to intense CL emission at 425 nm. The reaction of luminol with BP QDs are specifically catalyzed by cobalt (II) ion, this presents a sensitive CL method for cobalt (II) ion. A linear response range extends from 2.5 to 2000.0 pmol/L cobalt (II) ion and a detection limit of 0.7 pmol/L (3s) is acquired. The method displays a good precision approved by a relative standard deviation of 1.9% at 100.0 pmol/L cobalt (II) ion solution (n = 11). A preliminary application of the method was conducted by successful determination of cobalt amount in silica gel and rain water samples.
黑磷量子点（BP QDs）通过碱性 N-甲基-2-吡咯烷酮中的溶剂热剥离方法制备。BP QDs 直接诱导碱性鲁米诺产生明显的化学发光（CL）。通过 CL 光谱、紫外-可见吸收光谱、电子顺磁共振光谱以及自由基清除实验研究，提出了一种可能的反应机制。BP QDs 的存在显著增加了活性氧物质的生成，这导致了在 425nm 处的强烈 CL 发射。鲁米诺与 BP QDs 的反应被钴（II）离子特异性地催化，这为钴（II）离子提供了一种灵敏的 CL 方法。钴（II）离子的线性响应范围从 2.5 到 2000.0pmol/L，检测限为 0.7pmol/L（3s）。该方法在 100.0pmol/L 钴（II）离子溶液中（n=11）的相对标准偏差为 1.9%，显示出良好的精密度。该方法成功地用于测定硅胶和雨水样品中的钴含量，初步应用结果令人满意。
