...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Analytica chimica acta >A facile colorimetric sensor for ultrasensitive and selective detection of Lead(II) in environmental and biological samples based on intrinsic peroxidase-mimic activity of WS2 nanosheets
【24h】

A facile colorimetric sensor for ultrasensitive and selective detection of Lead(II) in environmental and biological samples based on intrinsic peroxidase-mimic activity of WS2 nanosheets

机译：基于WS2纳米片的内在过氧化物酶 - 模拟活性的环境和生物样品中的超细致敏感和选择性检测的容纳比色传感器

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Two-dimentional layered WS2 nanosheets with rich active edge exhibit intrinsic peroxidase-mimic activity, which make them an ideal material for sensor design. However, there is still lack of research on the catalysis and regulation mechanisms of the layered WS2 nanosheets as well as their application in the detection of hazardous substances. Herein, the regulatory effect of Pb(II) on the peroxidase-mimic activity of the layered WS2 nanosheets was firstly investigated, which enable us to construct a novel and facile colorimetric sensor for ultrasensitive and selective detection of Pb(II). To improve the performance of colorimetric sensor, some important parameters like buffer conditions, substrates and temperature have been investigated. Under the optimal conditions, the catalytic kinetics of layered WS2 nanosheets were extensively investigated. The peroxidase-mimic catalytic reaction was proved to be the "ping pong" mechanism, and the regulatory effect of Pb(II) on layered WS2 nanosheets was agreed with noncompetitive inhibition. The absorbance variation of colorimetric sensor is proportionally related to the concentration of heavy metals, which enable us to easily distinguish whether Pb(II) exceeds the permissible level in less than 20 min even by the naked eyes. The limit of detection (LOD) and the limit of quantification (LOQ) of the proposed colorimetric sensor for Pb(II) were determined as low as 4 mu g L-1 and 13.3 mu g L-1, and displays excellent selectivity against other competitive metal ions. Moreover, the further studies also validate the applicability of colorimetric sensor in several actual samples, indicating that our strategy may has prospective applications for Pb(II) detection in environment and biological samples. (C) 2020 Elsevier B.V. All rights reserved.
机译：具有富含活性边缘的二维分层WS2纳米片表现出内在过氧化物酶模拟活性，使它们成为传感器设计的理想材料。然而，仍然缺乏对层次的WS2纳米片的催化和调节机制以及它们在检测有害物质的应用中的研究。这里，首先研究了Pb（II）对层状WS2纳米片的过氧化物酶模拟活性的调节效应，使我们能够构建用于超细胞瘤和选择性检测PB（II）的新颖和体面的比色传感器。为了提高比色传感器的性能，已经研究了一些重要的参数，如缓冲条件，衬底和温度。在最佳条件下，广泛研究了层状的WS2纳米片的催化动力学。证明了过氧化物酶 - 模拟催化反应是“Ping Pong”机制，并与非竞争性抑制同意PB（II）对层次的WS2纳米片的调节作用。比色传感器的吸光度变化与重金属的浓度成比例，这使我们能够容易地区分Pb（II）甚至在肉眼的少于20分钟的情况下是否超过允许水平。用于Pb（II）的所提出的比色感传感器的检测极限（LOD）和量化的量化（LOQ）的定量限定为低至4μg1-1和13.3μgl-1，并显示出优异的选择性竞争性金属离子。此外，进一步的研究还验证了比色传感器在几种实际样本中的适用性，表明我们的策略可能对环境和生物样品中的PB（II）检测有前瞻性应用。 （c）2020 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号