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基于纳米金/介孔NiO/泡沫镍纳米复合材料的微型电极用于地下水重金属检测 Article
薛博元, 杨倩, 夏楷东, 李志宏, 陈宇徽, 张大奕, 周小红
《工程（英文）》 2023年 第27卷 第8期 页码 199-208 doi: 10.1016/j.eng.2022.06.005
Heavy metals, notably Pb2+ and Cu2+, are some of the most persistent contaminants found in groundwater. Frequent monitoring of these metals, which relies on efficient, sensitive, cost-effective, and reliable methods, is a necessity. We present a nanocomposite-based miniaturized electrode for the concurrent measurement of Pb2+ and Cu2+ by exploiting the electroanalytical technique of square wave voltammetry. We also propose a facile in situ hydrothermal calcination method to directly grow binder-free mesoporous NiO on a three-dimensional nickel foam, which is then electrochemically seeded with gold nanoparticles (AuNPs). The meticulous design of a low-barrier Ohmic contact between mesoporous NiO and AuNPs facilitates target-mediated nanochannel-confined electron transfer within mesoporous NiO. As a result, the heavy metals Pb2+ (0.020 mg·L−1 detection limit, 2.0–16.0 mg·L−1 detection range) and Cu2+ (0.013 mg·L−1 detection limit, 0.4–12.8 mg·L−1 detection range) can be detected simultaneously with high precision. Furthermore, other heavy metal ions and common interfering ions found in groundwater showed negligible impacts on the electrode's performance, and the recovery rate of groundwater samples varied between 96.3% ± 2.1% and 109.4% ± 0.6%. The compactness, flexible shape, low power consumption, and ability to remotely operate our electrode pave the way for onsite detection of heavy metals in groundwater, thereby demonstrating the potential to revolutionize the field of environmental monitoring.
关键词： AuNPs Mesoporous NiO Miniaturized electrode Heavy metal ions Groundwater Square wave voltammetry
Label-free colorimetric nanosensor with improved sensitivity for Pb
Abdul Ghaffar Memon, Xiaohong Zhou, Yunpeng Xing, Ruoyu Wang, Lanhua Liu, Mohsin Khan, Miao He
《环境科学与工程前沿（英文）》 2019年 第13卷 第1期 doi: 10.1007/s11783-019-1094-7
• Unmodified-AuNP based, colorimetric nanosensor was constructed for Pb2+ detection. • 5-nucleotide truncation in DNAzyme made complete substrate detachment upon Pb2+. • Ultrasensitive and selective detection of Lead (II) was achieved with 0.2×10-9 mol/L LOD.
关键词： Colorimetric nanosensor Truncated 8–17 DNAzyme Pb2+ detection Unmodified AuNPs
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