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Catalytic ozonation of sulfamethazine antibiotics using Fe 3 O 4 /multiwalled carbon nanotubes
Author(s) -
Bai Zhiyong,
Yang Qi,
Wang Jianlong
Publication year - 2018
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12737
Subject(s) - mineralization (soil science) , catalysis , ozone , adsorption , degradation (telecommunications) , chemistry , decomposition , chemical engineering , carbon nanotube , kinetics , chemical decomposition , nuclear chemistry , inorganic chemistry , organic chemistry , nitrogen , telecommunications , physics , quantum mechanics , computer science , engineering
Antibiotics are ubiquitous pollutants which cannot be effectively removed by conventional wastewater treatment processes. In this paper, the catalytic ozonation of sulfamethazine (SMT) by Fe 3 O 4 /multiwalled carbon nanotubes (MWCNTs) was investigated, including the effect of pH on degradation kinetics, mineralization, mechanism of SMT degradation, and ozone utilization. The experimental results showed that Fe 3 O 4 /MWCNTs catalyzed ozonation could increase the degradation and mineralization of SMT compared with ozonation alone. Acid condition was more favorable to the degradation and mineralization of SMT than neutral or basic conditions. The adsorption of organic pollutants and ozone onto Fe 3 O 4 /MWCNTs was an important step for SMT degradation. The catalytic ozonation of SMT by Fe 3 O 4 /MWCNTs was dependent on SMT adsorption, ozone decomposition rate and Fe 3 O 4 state. The possible degradation pathways for catalytic ozonation of SMT on the surface of Fe 3 O 4 /MWCNTs were tentatively proposed. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 678–685, 2018