Abstract
Considering the potential use of manganese oxide based nanocomposite in catalytic ozonation of water contaminant, we report unique three-dimensional (3D) nanoarchitectures composed of β-MnO2 and reduced graphene oxide (RGO) for catalytic ozonation of dichloroacetic acid (DCAA) from drinking water. The catalytic results show that the 3D β-MnO2/RGO nanocomposites (FMOG) can be used as efficient and stable ozonation catalysts to eliminate DCAA from water. The probable mechanism of catalytic ozonation was also proposed by detecting intermediates using gas chromatography-mass spectrometry. This result likely paves a facile avenue and initiates new opportunities for the exploration of heterogeneous catalysts for the removal of disinfection by-products from drinking water.
Highlights
Considering the potential use of manganese oxide based nanocomposite in catalytic ozonation of water contaminant, we report unique three-dimensional (3D) nanoarchitectures composed of β-MnO2 and reduced graphene oxide (RGO) for catalytic ozonation of dichloroacetic acid (DCAA) from drinking water
For the flower-like β-MnO2/RGO (FMOG) nanocomposite, there was a small peak around located at around 22.5° besides the diffraction peaks of pure β-MnO2 (PMO), corresponding to the diffraction from (002) plane of graphene[22]. This result confirms the incorporation of reduced graphene oxide in the FMOG nanocomposites
The morphology of prepared products was displayed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM)
Summary
Considering the potential use of manganese oxide based nanocomposite in catalytic ozonation of water contaminant, we report unique three-dimensional (3D) nanoarchitectures composed of β-MnO2 and reduced graphene oxide (RGO) for catalytic ozonation of dichloroacetic acid (DCAA) from drinking water. The catalytic results show that the 3D β-MnO2/RGO nanocomposites (FMOG) can be used as efficient and stable ozonation catalysts to eliminate DCAA from water. The probable mechanism of catalytic ozonation was proposed by detecting intermediates using gas chromatography-mass spectrometry This result likely paves a facile avenue and initiates new opportunities for the exploration of heterogeneous catalysts for the removal of disinfection by-products from drinking water. In order to eliminate the DBPs including DCAA from drinking water sources, many advanced oxidation methods have been developed[17,18,19,20] Among these methods, ozonation treatment of drinking water is regarded as one of the most promising techniques because it is cost-effective and there are no new DBPs to be produced. Considering the reaction conditions, such as pH, reaction temperature, and the dose of the catalyst, the FMOG nanocomposite was proved to be a robust and effective ozonation catalyst for eliminating trace DCAA from drinking water
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