Restricted accessResearch articleFirst published online 2020-04
Synthesis of Microscale Zinc–Copper Bimetallic Particles and Their Performance Toward p -Nitrophenol Removal: Characterization,Mineralization,and Response Surface Methodology
In this study, microscale zinc–copper (mZn/Cu) bimetallic particles were prepared through precipitating Cu on the surface of Zn and applied in the degradation of p-nitrophenol (PNP). To optimize reaction conditions, three control parameters, including reciprocating speed, mZn/Cu dosage, and PNP concentration, were investigated by the central composite rotatable design coupling with response surface methodology. To further evaluate the catalytic activity of mZn/Cu, the removal of PNP and total organic carbon (TOC) were compared in different systems. It is found that the removal of TOC by mZn/Cu, mFe/Cu, mZn, mFe, mCu, and mZn + mCu was 77%, 41%, 5%, 7%, 19%, and 9%, respectively. The maximum mineralizing of PNP was realized in the system of mZn/Cu/PNP, suggesting that PNP mainly underwent oxidative degradation. Furthermore, these results also indicate that PNP was basically reduced in the presence of mZn, mFe, and mZn + mCu. The mechanism investigations via florescence spectroscopy and free radical scavengers reveal that •OH generated from Fenton-like reaction was responsible for the decomposition of PNP by mZn/Cu. Based on the analyses of intermediates detected by liquid chromatography-mass spectrometry, the possible degradation pathways of PNP are proposed. In summary, mZn/Cu bimetallic particles are a potential approach to degrade PNP under aerobic condition.
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