煅烧诱导增强纳米银支撑 CoZn 双金属 ZIF 的 Cd2+ 和 Pb2+ 电化学检测能力

IF 5.1 2区 环境科学与生态学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Siyan Wang, Yangcan Zhao, Chengkai Xia, Wantong Zhu, Ying Hou, Xiangpeng Zeng and Hongyan Xu
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引用次数: 0

摘要

快速准确地电化学检测重金属离子需要比表面积大、导电性好、具有高效电化学催化活性的电极材料。基于 MOF 材料高比表面积的优势,本研究将 Ag 纳米颗粒支撑的 CoZn 双金属沸石咪唑框架(Ag@ZIF)装饰在工作电极上,用于 Pb2+ 和 Cd2+ 的检测,并通过煅烧提高了其导电性和电化学催化活性。研究人员对煅烧温度对 Ag@ZIF 的组成、结构和电化学性能的影响进行了系统研究。研究表明,随着煅烧温度从 600 ℃升高到 1100 ℃,Ag@ZIF 中的 Co2+ 和 Zn2+ 离子首先结合成 Co3ZnC,然后转移到金属 Co 和 Zn 上,在 1000 ℃ 的高煅烧温度下,Zn 完全蒸发。煅烧后的 Ag@ZIF 形状由多孔十二面体转变为多孔球体,并在 1100 ℃ 时框架坍塌。在 1000 ℃ 下煅烧的 Ag@ZIF 在重金属离子检测方面表现出最佳性能,具有低检测限(Pb2+ 7.28 nM,Cd2+ 14.63 nM)和高灵敏度(Pb2+ 8.907 μA/μM,Cd2+ 4.757 μA/μM)。此外,所制作的传感器还具有极佳的选择性、可重复性和稳定性,因此适用于检测实际水样中的 Pb2+ 和 Cd2+。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Calcination-induced enhancement of Cd2+ and Pb2+ electrochemical detection capabilities of nano-ag-supported CoZn bi-metal ZIFs†

Calcination-induced enhancement of Cd2+ and Pb2+ electrochemical detection capabilities of nano-ag-supported CoZn bi-metal ZIFs†

Electrode materials with a large specific surface area, good conductivity, and efficient electrochemical catalytic activity are necessary for the rapid and accurate electrochemical detection of heavy metal ions. Based on the advantage of the high specific surface area of MOF materials, in this study, an Ag nanoparticle-supported CoZn bi-metal zeolitic imidazolate framework (Ag@ZIF) was decorated on working electrodes for Pb2+ and Cd2+ detection, and its conductivity and electrochemical catalytic activity were boosted to a high scale via calcination. A systematic study was conducted to discern the impact of the calcination temperature on the composition, structure, and electrochemical performance of Ag@ZIF. The investigation indicated that as the calcination temperature was increased from 600 °C to 1100 °C, the Co2+ and Zn2+ ions in Ag@ZIF were first combined into Co3ZnC and then transferred to metallic Co and Zn, accompanied with the complete evaporation of Zn at a high calcination temperature of 1000 °C. While the morphology of the calcinated Ag@ZIF turned from multiporous dodecahedra to multiporous spheres, followed by the collapse of the framework at 1100 °C. The Ag@ZIF calcinated at 1000 °C exhibited optimal performance for heavy metal ion detection, with a low limit of detection (Pb2+ 7.28 nM, Cd2+ 14.63 nM) and high sensitivity (Pb2+ 8.907 μA μM−1, Cd2+ 4.757 μA μM−1). Moreover, the fabricated sensor also demonstrated excellent selectivity, repeatability, and stability, making it suitable for detecting Pb2+ and Cd2+ in real water samples.

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来源期刊
Environmental Science: Nano
Environmental Science: Nano CHEMISTRY, MULTIDISCIPLINARY-ENVIRONMENTAL SCIENCES
CiteScore
12.20
自引率
5.50%
发文量
290
审稿时长
2.1 months
期刊介绍: Environmental Science: Nano serves as a comprehensive and high-impact peer-reviewed source of information on the design and demonstration of engineered nanomaterials for environment-based applications. It also covers the interactions between engineered, natural, and incidental nanomaterials with biological and environmental systems. This scope includes, but is not limited to, the following topic areas: Novel nanomaterial-based applications for water, air, soil, food, and energy sustainability Nanomaterial interactions with biological systems and nanotoxicology Environmental fate, reactivity, and transformations of nanoscale materials Nanoscale processes in the environment Sustainable nanotechnology including rational nanomaterial design, life cycle assessment, risk/benefit analysis
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