Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 405, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124642
Keywords
Surface-enhanced Raman scattering; Oxidase-like reaction; Nanozyme; Removal of organic mercury
Categories
Funding
- National Natural Science Foundation of China [21473068, 21773080]
- Jilin Province Science and Technology Development Plan Project [20180101295JC]
- Open Funds of the State Key Laboratory of Electroanalytical Chemistry [SKLEAC202006]
- Assembly and Functionalities of Supramolecular Systems (SFSS) [BP0618011]
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The fabrication of Au-NiFe layered double hydroxide/rGO nanocomposite enables efficient degradation and removal of organic mercury in industrial wastewater, with high sensitivity and environmental and economic advantages.
Total removal of organic mercury in industrial wastewater is a crucially important task facing environmental pollution in the current world. Herein, we demonstrate the fabrication of Au-NiFe layered double hydroxide (LDH)/rGO nanocomposite as not only an efficient nanozyme with oxidase-like activity but also an efficient surface-enhanced Raman spectroscopy (SERS) substrate to determine organic mercury, with the minimum detection concentration as low as 1 x 10(-8) M. According to the binding energy of X-Ray photoelectron spectrometer (XPS) and the free radicals of electron paramagnetic resonance (EPR) spectra, the mechanism of catalytic enhanced degradation is the production of Au-amalgam on Au surface, accelerating the electron transfer and the generation of O-2(center dot-) radicals from oxygen molecules and center dot CH3 radicals from the methyl group in MeHg to participate the oxidase-like reaction. Furthermore, the Au-NiFe LDH/rGO nanocomposite is able to degrade and remove 99.9% of organic mercury in two hours without the secondary pollution by Hg2+. In addition, the material can be used for the multiple degradation-regeneration cycles in actual applications, which is significant in terms of the environmental and economic point of view. This work may open a new horizon for both highly sensitive detection and thorough degradation of organic mercury in environmental science and technology.
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