Institute for Ecological Research and Pollution Control of Plateau Lakes, Qilu Lake Field Scientific Observation and Research Station for Plateau Shallow Lake in Yunnan Province, School of Ecology and Environmental Science, Yunnan University, Kunming, 650504, China.
Yunnan Tobacco Quality Supervision and Test Station, Kunming, 650106, China.
Anal Chim Acta. 2024 Sep 8;1321:343038. doi: 10.1016/j.aca.2024.343038. Epub 2024 Jul 30.
The heavy metal ion Cd is acutely toxic, and excessive concentrations can have adverse effects on human production and life, and even lead to significant public health risks and environmental impacts. There are several mature non-electrochemical methods for heavy metal detection, but these methods are characterized by high cost, which makes it difficult to be applied to the field for timely detection. Therefore, it is necessary to prepare a new electrochemical sensor that is environmentally friendly and capable of detecting Cd in the environment quickly, easily and sensitively.
In this study, hydrogen-bonded organic frameworks (HOFs) were synthesized by a simple hydrothermal reaction. The prepared materials consisted of only C, N and O and had a thin lamellar structure. The HOFs were integrated into a novel electrochemical sensor to achieve accurate detection of Cd ions in real aqueous environments by square wave anodic dissolution voltammetry. The sensor has a wide linear range and a detection limit as low as 0.13 μg/L. Several real water samples, such as tap water, lake water, and e-cigarette digest, were analyzed to simulate the working environment of the sensor, and the results showed that the recoveries of Cd ranged from 95.75 % to 101.2 %.
We pioneered the detection of heavy metal ions Cd in e-cigarette digestate samples with the innovative use of HOFs as the sensor material, which demonstrated the potential application in electrochemical sensing with extremely low background current value and high sensitivity, providing new ideas for environmental monitoring and public health control.
重金属离子 Cd 具有急性毒性，其浓度过高会对人类生产生活产生不良影响，甚至会带来重大的公共健康风险和环境影响。目前已有几种成熟的重金属检测非电化学方法，但这些方法存在成本高的特点，难以应用于现场的实时检测。因此，有必要制备一种新型电化学传感器，使其对环境中的 Cd 具有环保、快速、简便、灵敏的检测能力。
本研究通过简单的水热反应合成了氢键有机框架（HOFs）。所制备的材料仅由 C、N 和 O 组成，具有薄片状结构。将 HOFs 集成到新型电化学传感器中，通过方波阳极溶出伏安法实现了对真实水相中 Cd 离子的准确检测。该传感器具有较宽的线性范围和低至 0.13μg/L 的检测限。对几种实际水样（如自来水、湖水和电子烟液）进行了分析，以模拟传感器的工作环境，结果表明 Cd 的回收率在 95.75%至 101.2%之间。
我们开创性地使用 HOFs 作为传感器材料，用于电子烟液样品中重金属离子 Cd 的检测，这为电化学传感提供了新的思路，其具有极低的背景电流值和高灵敏度，在环境监测和公共卫生控制方面具有潜在的应用价值。
