Kurshanov Danil A, Khavlyuk Pavel D, Baranov Mihail A, Dubavik Aliaksei, Rybin Andrei V, Fedorov Anatoly V, Baranov Alexander V
Center of Information Optical Technology, ITMO University, 49 Kronverksky Prospekt, 197101 St. Petersburg, Russia.
Materials (Basel). 2020 Sep 30;13(19):4373. doi: 10.3390/ma13194373.
Heavy metal ions are not subject to biodegradation and could cause the environmental pollution of natural resources and water. Many of the heavy metals are highly toxic and dangerous to human health, even at a minimum amount. This work considered an optical method for detecting heavy metal ions using colloidal luminescent semiconductor quantum dots (QDs). Over the past decade, QDs have been used in the development of sensitive fluorescence sensors for ions of heavy metal. In this work, we combined the fluorescent properties of AgInS/ZnS ternary QDs and the magnetism of superparamagnetic FeO nanoparticles embedded in a matrix of porous calcium carbonate microspheres for the detection of toxic ions of heavy metal: Co, Ni, and Pb. We demonstrate a relationship between the level of quenching of the photoluminescence of sensors under exposure to the heavy metal ions and the concentration of these ions, allowing their detection in aqueous solutions at concentrations of Co, Ni, and Pb as low as ≈0.01 ppm, ≈0.1 ppm, and ≈0.01 ppm, respectively. It also has importance for application of the ability to concentrate and extract the sensor with analytes from the solution using a magnetic field.
重金属离子不易被生物降解，会对自然资源和水体造成环境污染。许多重金属即使含量极少，对人体健康也具有高毒性和危险性。本研究考虑采用一种光学方法，利用胶体发光半导体量子点（QDs）检测重金属离子。在过去十年中，量子点已被用于开发针对重金属离子的灵敏荧光传感器。在本研究中，我们将AgInS/ZnS三元量子点的荧光特性与嵌入多孔碳酸钙微球基质中的超顺磁性FeO纳米颗粒的磁性相结合，用于检测重金属有毒离子：Co、Ni和Pb。我们证明了传感器在暴露于重金属离子时光致发光的猝灭程度与这些离子浓度之间的关系，使得能够在水溶液中分别以低至≈0.01 ppm、≈0.1 ppm和≈0.01 ppm的浓度检测Co、Ni和Pb。利用磁场从溶液中浓缩和提取带有分析物的传感器的能力，其应用也具有重要意义。
