Abstract
Mercury (Hg) is a heavy metal pollutant, there is an urgent need to develop simple and sensitive methods for Hg(II) in water. In this article, a simple and sensitive resonance Rayleigh scattering (RRS) method was developed for determination of 0.008–1.33 µmol/L Hg, with a detection limit of 0.003 μmol/L, based on the Hg(II) regulation of gold nanoenzyme catalysis on the HAuCl4-H2O2 to form gold nanoparticles (AuNPs) with an RRS peak at 370 nm. Upon addition of molecular probes of Victoria blue B (VBB), the surface-enhanced Raman scattering (SERS) peak linearly decreased at 1612 cm−1 with the Hg(II) concentration increasing in the range of 0.013–0.5 μmol/L. With its good selectivity and good accuracy, the RRS method is expected to be a promising candidate for determining mercury ions in water samples.
Highlights
Nanomaterials have unique optical, electrical, and magnetic properties, and have bio-enzyme activity [1,2]
We found that, in hydrochloric acid medium, the reaction of H2O2-HAuCl4 was relatively slow
While nanocatalyst of AuNP was added, a large number of HAuCl4 adsorbed on the AuNP surface, and H2O2 was adsorbed on the surface that there had many free electrons, which can enhance the redox electron-transfer between H2O2-HAuCl4
Summary
Nanomaterials have unique optical, electrical, and magnetic properties, and have bio-enzyme activity [1,2]. Since Fe3O4 nanoparticles have been found to have intrinsic peroxidase-like activity [3], nanoenzyme have become interesting to people They have vast application prospects with advantages of easy production process, good stability and recycling, low-cost of storage and transport, and high adaptability of heat, acid, and alkali [1,2,3,4,5,6,7,8,9,10,11]. Several methods have been reported to determine Hg2+, such as atomic fluorescence spectroscopy (AFS), atomic absorption spectrometry (AAS), and inductively coupled plasma mass spectrometry (ICP-MS) [14,15,16] These methods have high selectivity and sensitivity for Hg2+ detection, these methods have a number of weaknesses such as expensive instruments, long analysis period, need for professional operators, and so on. Two simple, rapid, low cost, high sensitivity, and good selectivity RRS and SERS methods were established for detection of Hg2+
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