Citation: WANG Ying-Sha, CHENG Shan-Shan, ZHANG Shou-Ting, LU Xiao-Quan. Construction of Hg²⁺ Signal Sensing Platform Based on Graphene Oxide/Polyethylene Glycol/Platinum Nanohybrids[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(6): 1035-1043. doi: 10.19756/j.issn.0253-3820.211034 shu

Construction of Hg²⁺ Signal Sensing Platform Based on Graphene Oxide/Polyethylene Glycol/Platinum Nanohybrids

1.
Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China;
2.
Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China

Corresponding author: ZHANG Shou-Ting, LU Xiao-Quan,
Received Date: 15 January 2021
Revised Date: 5 May 2021

Fund Project: Supported by the Special Fund Project for the Central Government to Guide Local Science and Technology Development (2020).

Platinum nanoparticles were loaded onto the surface of poly(ethylene glycol)-modified graphene oxide (GO/PEG/Pt) via an in-situ reduction method. GO/PEG/Pt nanohybrids had excellent peroxidase-like activity in aqueous solution, and could catalyze H₂O₂ to produce ·OH rapidly, thus making the chromogenic substrate 3,3',5,5'-tetramethylbenzidine hydrochloride (TMB·2HCl) changed obviously and an absorption peak appeared at 652 nm in UV-Vis absorption spectrum. However, when the mercury ions (Hg²⁺) were introduced, Hg²⁺ was reduced to Hg⁰ by Pt⁰ and deposited on the surface of platinum nanoparticles to form platinum amalgam, which resulted in the occupation of surface-active sites of GO/PEG/Pt, the signal output of the system was inhibited, and the degree of inhibition varied linearly with Hg²⁺ concentration. Therefore, under the optimized experimental conditions, the visual colorimetric sensor was constructed to realize the sensitive analysis and real-time detection of Hg²⁺. The detection limit of spectral analysis was 3.96 nmol/L, and the detection limit of naked eye was 10 nmol/L. The method was applied to determination of Hg²⁺ in tap water and lake water, and the recoveries were between 95.5% and 108.6%.
- Graphene oxide,
- Platinum nanoparticles,
- Mercury ion,
- Peroxidase-like activity,
- Visualization
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沈阳化工大学材料科学与工程学院沈阳 110142

Construction of Hg2+ Signal Sensing Platform Based on Graphene Oxide/Polyethylene Glycol/Platinum Nanohybrids

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通讯作者: 陈斌, bchen63@163.com

Construction of Hg²⁺ Signal Sensing Platform Based on Graphene Oxide/Polyethylene Glycol/Platinum Nanohybrids