Nan Wang,Xiaofan Zhai,Fang Guan,Ruiyong Zhang,Baorong Hou,Jizhou Duan
Exploring new and high efficiency mimic enzymes is a vital and novel strategy for antibacterial application. Haloperoxidase-like enzymes have attracted wide attention thanks to their amazing catalytic property for hypohalous acid generation from hydrogen peroxide and halides. However, few materials have displayed halogenating catalytic performance until now. Herein, we synthesized N-doped C/CeO2(N-C/CeO2) composite materials by a combination of the liquid and solid-state method. N-C/CeO2can possess haloperoxidase-like catalytic activity by catalyzing the bromination of organic signaling compounds (phenol red) with H2O2at a wide range of temperatures (20 °C to 55 °C), with a solution color changing from yellow to blue. Meanwhile, it exhibits high catalytic stability/recyclability in the catalytic reaction. The synthesized N-C/CeO2composite can effectively catalyze the oxidation of Br−with H2O2to produce HBrO without the presence of phenol red. The produced HBrO can resist typical marine bacteria likePseudomonas aeruginosa. This study provides an efficient biomimetic haloperoxidase and a novel sustainable method for antibacterial application.Keywords:N-C/CeO2composite;catalytic materials;biomimetic catalyst;haloperoxidase-like enzyme;antibacterial
Huijie Wang,Hongzhao Chen,Qingqiao Wan,Yuzhao Zheng,Yang Wan,Xin Liu,Xianghai Song,Wei Ma,Pengwei Huo
In this work, a Co-N/C@CeO 2 composite material was successfully synthesized via hydrothermal, in-situ growth, calcination methods and applied in a thermal-assisted activation peroxymonosulfate (PMS) system for efficient degradation of polyethylene terephthalate microplastics (PET MPs). The effects of various parameters, including catalysts, reaction temperature, H 2 O 2 , PMS dosages and catalyst loading, on the degradation efficiency of PET MPs were systematically investigated. Characterization techniques, including mass spectral (MS) analysis, in-situ Fourier transform infrared (in-situ FT-IR) and electron paramagnetic resonance (ESR), revealed that PET MPs adsorbed on the surface were rapidly degraded under the action of hydroxyl radical (•OH) and sulfate radical (SO 4 •− ). In the presence of a small amount of H 2 O 2 and the synergistic effect, the Co-N/C@CeO 2 composite material successfully achieved a 92.3% degradation rate of PET MPs in the thermal-assisted activation PMS system. DFT calculations indicated that the Co-N/C@CeO 2 composite material exhibited relatively lower adsorption energy and higher activation capacity for HSO 5 − molecules. In addition, toxicity assessment results showed that the degradation intermediates had generally lower toxicity. This study not only provides valuable insights for the construction of high-activity Co-N/C and CeO 2 composite materials but offers technical and theoretical guidance for the effective degradation of PET MPs in the environment.
危险品化学品经营许可证（带存储）