title: Fenton-like degradation of sulfamethazine using Fe3O4/Mn3O4nanocomposite catalyst: kinetics and catalytic mechanism.
abstract: The kinetics and catalytic mechanism of sulfamethazine (SMT) degradation using Fe3O4/Mn3O4nanocomposite as catalysts in heterogeneous Fenton-like process were investigated. The degradation process of SMT conformed to first-order kinetic model. The apparent activation energy (Ea) of the process was calculated to be 40.5 kJ/mol. The reusability and stability of the catalysts were evaluated based on the results of the successive batch experiments. The intermediates were identified and quantified by ion chromatography (IC), high-performance liquid chromatography (HPLC), and gas chromatography-mass spectrometry (GC-MS). The results suggested that the bonds of S-C, N-C, and S-N were broken mainly by ·OH attack to form the organic compounds, which were gradually decomposed into small-molecule organic acids, such as oxalic acid, propionic acid, and formic acid. The possible catalytic mechanism for SMT degradation was tentatively proposed.
authors.affiliation: Collaborative Innovation Center for Advanced Nuclear Energy Science Building, INEB, Tsinghua University, Beijing, 100084, People's Republic of China.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Wan
authors.affiliation: Collaborative Innovation Center for Advanced Nuclear Energy Science Building, INEB, Tsinghua University, Beijing, 100084, People's Republic of China. wangjl@tsinghua.edu.cn.|Beijing Key Laboratory of Radioactive Waste Treatment, Tsinghua University, Beijing, 100084, People's Republic of China. wangjl@tsinghua.edu.cn.
authors.forename: Jianlong
authors.identifier: http://orcid.org/0000-0001-9572-851X
authors.initials: J
authors.lastname: Wang
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry*; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D005561:Formates / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D007700:Kinetics; D017895:Manganese Compounds / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D019815:Oxalic Acid / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D011422:Propionates / Q000737:chemistry; D013418:Sulfamethazine / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D005561:Formates; D017895:Manganese Compounds; D010087:Oxides; D011422:Propionates; D014874:Water Pollutants, Chemical; C030544:formic acid; D013418:Sulfamethazine; C027424:manganese oxide; D019815:Oxalic Acid; C029658:propionic acid; D052203:Ferrosoferric Oxide
keywords: Antibiotics; Fe3O4/Mn3O4 nanocomposites; Fenton-like process; Sulfamethazine