Journal
ANALYST
Volume 147, Issue 1, Pages 101-108Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1an01895g
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Funding
- Program for Innovative Leading Talents in Fujian Province [2016B016]
- Program for Innovative Research Team in Science and Technology in Fujian Province University [2018B033]
- Startup Fund for Scientific Research, Fujian Medical University [2018QH2016]
- Joint Funds for the Innovation of Science and Technology, Fujian Province [2019Y9007]
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A colorimetric sensor array based on citrate-capped noble metal nanozymes was developed to discriminate different concentrations of heavy metal ions, with practical applications demonstrated in tap water and SiYu lake water. The method was effective in quantifying Hg2+ at nanomolar concentrations, showing promising potential for further applications.
Heavy metal ions (HMIs), including Cu2+, Ag+, Cd2+, Hg2+, and Pb2+ from the environment pose a threat to human beings and can cause a series of life-threatening diseases. Therefore, colorimetric sensors with convenience and flexibility for HMI discrimination are still required. To provide a solution, a peroxidase-like activity-based colorimetric sensor array of citrate-capped noble metal nanozymes (osmium, platinum, and gold) has been fabricated. Some studies reported that some HMIs could interact with the noble metal nanozymes leading to a change in their peroxidase-like activity. This phenomenon was confirmed in our work. Based on this principle, different concentrations of HMIs (Cu2+, Ag+, Cd2+, Hg2+, and Pb2+) were discriminated. Moreover, their practical application has been tested by discriminating HMIs in tap water and SiYu lake water. What is more, as an example of the validity of our method to quantify HMIs at nanomolar concentrations, the LOD of Hg2+ was presented. To sum up, our study not only demonstrates the differentiation ability of this nanozyme sensor array but also gives hints for using nanozyme sensor arrays for further applications.
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