DOI: 10.1016/j.watres.2018.12.007
Scopus记录号: 2-s2.0-85058819334
论文题名: Elucidation of stoichiometric efficiency, radical generation and transformation pathway during catalytic oxidation of sulfamethoxazole via peroxymonosulfate activation
作者: Bao Y. ; Oh W.-D. ; Lim T.-T. ; Wang R. ; Webster R.D. ; Hu X.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 64
结束页码: 74
语种: 英语
英文关键词: Antibiotics
; Nano-bimetallic oxides
; Peroxymonosulfate
; Radical generation
; Stoichiometric efficiencies
; Transformation pathway
Scopus关键词: Antibiotics
; Chemical activation
; Cobalt compounds
; Efficiency
; Electron spin resonance spectroscopy
; Electron transitions
; Fourier transform infrared spectroscopy
; Free radical reactions
; Iron oxides
; Nanocatalysts
; Nitration
; Oxidation
; Paramagnetic resonance
; X ray photoelectron spectroscopy
; Bimetallic oxides
; Electron paramagnetic resonances (EPR)
; Electron transfer mechanisms
; Peroxymonosulfate
; Peroxymonosulfate activations
; Radical generation
; Solution combustion method
; Transformation pathways
; Catalytic oxidation
; cobalt
; oxide
; scavenger
; sulfamethoxazole
; sulfate
; antibiotics
; catalysis
; catalyst
; chemical compound
; detection method
; efficiency measurement
; experimental study
; isotopic ratio
; methodology
; oxidation
; oxide
; radical
; scavenging (chemistry)
; stoichiometry
; sulfate
; transformation
; adsorption
; Article
; catalyst
; combustion
; comparative study
; decomposition
; degradation
; electron spin resonance
; electron transport
; Fourier transform infrared spectroscopy
; hydrolysis
; hydroxylation
; nitration
; observed association rate constant
; oxidation
; priority journal
; rate constant
; room temperature
; stoichiometry
; surface area
; X ray photoemission spectroscopy
英文摘要: In this work, nano-bimetallic Co/Fe oxides with different stoichiometric Co/Fe ratios were prepared using a novel one-step solution combustion method. The nano-bimetallic Co/Fe oxides were used for sulfamethoxazole (SMX) degradation via peroxymonosulfate (PMS) activation. The stoichiometric efficiencies of the as-prepared nano-bimetallic catalysts were calculated and compared for the first time. The radical generation was identified by electron paramagnetic resonance (EPR) as well as chemical quenching experiments, in which different scavengers were used and compared. The catalytic PMS activation mechanism in the presence of catalyst was examined by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results showed that besides SO 4 • - and •OH, •OOH was also detected in the PMS/CoFeO 2.5 system. Meanwhile, in addition to the previously proposed radical oxidation pathway, the results showed that SMX degradation also involved a non-radical oxidation, which could be verified by the degradation experiment without catalyst as well as the detection of 1 O 2 . In the PMS activation process, cobalt functioned as the active site on CoFeO 2.5 while Fe oxide functioned as the adsorption site. The electron transfer mechanism was proposed based on the XPS and metal leaching results. Additionally, via the detection of transformation products, different SMX transformation pathways involving nitration, hydroxylation and hydrolysis in the PMS/CoFeO 2.5 system were proposed. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122067
Appears in Collections: 气候变化事实与影响
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作者单位: Interdisciplinary Graduate School, Nanyang Technological University637141, Singapore; Nanyang Environment and Water Research Institute, Nanyang Technological University637141, Singapore; School of Chemical Sciences, Universiti Sains MalaysiaPenang 11800, Malaysia; School of Civil and Environmental and Engineering, Nanyang Technological University639798, Singapore; School of Physical and Mathematical Sciences, Nanyang Technological University637371, Singapore; School of Materials Science and Engineering, Nanyang Technological University639798, Singapore
Recommended Citation:
Bao Y.,Oh W.-D.,Lim T.-T.,et al. Elucidation of stoichiometric efficiency, radical generation and transformation pathway during catalytic oxidation of sulfamethoxazole via peroxymonosulfate activation[J]. Water Research,2019-01-01