title: Pyrite-enhanced degradation of chloramphenicol by low concentrations of H2O2.
abstract: A pyrite-catalyzed reaction was used to degrade chloramphenicol. Chloramphenicol could be almost 100% removed within 60 minutes when 1 mM H2O2 and 0.1 g/L pyrite were added at an initial pH=3. During oxidation, intermediates such as nitrobenzaldehyde and dichloroacetamide were identified by gas chromatography/mass spectrometry (GC/MS). The •OH was identified by electron spin-resonance spectroscopy. Pyrite was digested to determine elements by ICP (inductive coupled plasma emission spectrometer). To understand the reaction mechanism and the role of natural pyrite in these processes, techniques including scanning electron microscopy and energy dispersive spectrometry were employed to characterize the solid sample. The results explain that pyrite acts as a 'bond' between Fe3+ and H2O2, and this pathway continues to form •OH and inhibit the quenching reaction. Therefore, pyrite-catalyzed reactions would proceed even in low concentrations of H2O2.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse (Tongji University), School of Environmental Science & Engineering, Tongji University, Shanghai 200092, China E-mail: wudeli@tongji.edu.cn.
authors.forename: Deli
authors.initials: D
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse (Tongji University), School of Environmental Science & Engineering, Tongji University, Shanghai 200092, China E-mail: wudeli@tongji.edu.cn.
authors.forename: Yanxia
authors.initials: Y
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse (Tongji University), School of Environmental Science & Engineering, Tongji University, Shanghai 200092, China E-mail: wudeli@tongji.edu.cn.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse (Tongji University), School of Environmental Science & Engineering, Tongji University, Shanghai 200092, China E-mail: wudeli@tongji.edu.cn.
authors.forename: Luming
authors.initials: L
authors.lastname: Ma
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse (Tongji University), School of Environmental Science & Engineering, Tongji University, Shanghai 200092, China E-mail: wudeli@tongji.edu.cn.
authors.forename: Yalei
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry*; D002384:Catalysis; D002701:Chloramphenicol / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D013440:Sulfides / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D013440:Sulfides; C011342:pyrite; D002701:Chloramphenicol; D006861:Hydrogen Peroxide; D007501:Iron