纳米铁氧化物催化类Fenton反应降解抗生素磺胺

Degradation of Antibiotic Sulfanilamide in Aqueous Solution via a Heterogeneous Fenton-like Reaction Catalyzed by Nano-Iron Oxides

采用纳米铁矿物(赤铁矿α-Fe2O3、磁赤铁矿γ-Fe2O3、磁铁矿Fe3O4、水铁矿Fe5HO8·4H2O)为催化剂与H2O2构成类Fenton反应,进行抗生素磺胺的氧化降解研究,并考察磺胺初始浓度、铁氧化物投加量、H2O2浓度、溶液p H等对磺胺氧化降解过程的影响。结果表明,磺胺初始浓度2 mg·L-1、赤铁矿投加量1 g·L-1、H2O2浓度30 m L·L-1、溶液p H 3.6和温度25℃条件下,反应72 h后磺胺的降解率为99.27%。利用LC-MS进行产物分析,表明铁氧化物催化类Fenton反应降解磺胺主要是催化氧化反应,磺胺分子结构中的对位氨基被氧化成硝基。

Degradation of antibiotic sulfanilamide by a heterogeneous Fenton-like reaction was investigated using different nano- iron ox-ides(hematite, maghemite, magnetite, and ferrihydrite)as catalyst and hydrogen peroxide as oxidizing agent. The influences of initial sul-fanilamide concentration, catalyst amount, H2O2 dose, and initial p H value on Fenton-like reaction were assessed. The optimal reaction conditions were 2 mg·L-1of initial sulfanilamide concentration, 1 g·L-1of catalyst, 30 m L·L-1of H2O2, and 3.6 of initial p H, and the degradation rate of sulfanilamide could reach 99.27% within 72 h. The degradation process of sulfanilamide by the Fenton-like reaction was mainly oxidation of-NH2 group to the-NO2 via catalytic oxidation reaction.