School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, 330031, China.
Bio 3D Printing Laboratory, School of Mechanical and Electrical Engineering, Nanchang University, Nanchang, 330031, China.
Mikrochim Acta. 2023 Mar 24;190(4):153. doi: 10.1007/s00604-023-05710-5.
Titanium carbide quantum dots (TiC QDs) were synthesized by ammonia-assisted hydrothermal method. We also synthesized potassium permanganate (KMnO)-functionalized TiC QDs (Mn-QDs) by modifying TiC nanosheets with KMnO and then cutting the functional nanosheets into Mn-QDs. The TiC QDs and Mn-QDs were characterized by fluorescence spectroscopy (FL), Fourier transform infrared spectroscopy (FTIR), UV-vis spectrophotometry (UV-vis), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). Furthermore, the modified Mn-QDs have strong luminescence ability and good dispersion stability, which can be used for Cr and Hg double ion detection with enhanced fluorescence specificity. Cr/Hg and negatively charged Mn-QDs are bound together by electrostatic interactions. Meanwhile, the surface of Mn-QDs is rich in functional groups, which interacts with Cr/Hg to modify the surface traps, leading to defect passivation and exhibiting photoluminescence enhancement. For the dynamic quenching produced by the interaction of Mn-QDs with Hg within 50 μM, it may be caused by the complex formation of Hg trapped by the amino group on the surface of Mn-QDs. The detection limits for Cr and Hg were 0.80 μM and 0.16 μM, respectively. The recoveries of Cr and Hg ions in real water samples were 93.79-105.10% and 93.91-102.05%, respectively, by standard addition recovery test. In this work, the application of Mn-QDs in Cr and Hg ion detection was researched, which opens a new way for its application in the field of detecting heavy metal ions.
碳化钛量子点（TiC QDs）通过氨辅助水热法合成。我们还通过用 KMnO4 修饰 TiC 纳米片并将功能化纳米片切割成 Mn-QDs 来合成高锰酸钾（KMnO）功能化的 TiC QDs（Mn-QDs）。TiC QDs 和 Mn-QDs 通过荧光光谱（FL）、傅里叶变换红外光谱（FTIR）、紫外可见分光光度法（UV-vis）、X 射线光电子能谱（XPS）和透射电子显微镜（TEM）进行了表征。此外，修饰后的 Mn-QDs 具有较强的发光能力和良好的分散稳定性，可用于 Cr 和 Hg 双离子检测，增强荧光特异性。Cr/Hg 和带负电荷的 Mn-QDs 通过静电相互作用结合在一起。同时，Mn-QDs 的表面富含官能团，与 Cr/Hg 相互作用修饰表面陷阱，导致缺陷钝化并表现出光致发光增强。对于 Mn-QDs 与 Hg 之间相互作用产生的 50 μM 内的动态猝灭，可能是由于 Hg 与 Mn-QDs 表面氨基形成复合物所致。Cr 和 Hg 的检测限分别为 0.80 μM 和 0.16 μM。通过标准加入回收试验，实际水样中 Cr 和 Hg 离子的回收率分别为 93.79-105.10%和 93.91-102.05%。在这项工作中，研究了 Mn-QDs 在 Cr 和 Hg 离子检测中的应用，为其在重金属离子检测领域的应用开辟了新途径。
