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Published on: February 5, 2019
Galvanic effects between mackinawite and pyrogenic carbon: Enhancing radical-mediated ciprofloxacin transformation
Danning Lu1, Longgang Chu1, Haoran Yu1
1State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, PR China.
Abstract:
Mackinawite (FeS) and pyrogenic carbon (PC) widely coexist in paddy soil and sediment, playing crucial roles in elements biogeochemical cycles and pollutants transformation. However, the potential electrochemical interactions between FeS and PC have always been overlooked. This study explores how PC influences FeS oxidation and the generation of reactive oxygen species (ROS) under various conditions, with a particular focus on the galvanic effects. By integrating electrochemical techniques with chemical analysis, spectroscopy characterizations, and fluorescence imaging, we demonstrate PC acts as cathode facilitates the oxidation of FeS and alters the oxidation pathway of FeS, with S(-II) preferentially oxidized to soluble sulfur oxyanions such as SO32-. The galvanic effect significantly influences both the capacity and types of ROS within the FeS system, ultimately altering the rate and pathway of ciprofloxacin transformation. These findings provide deeper insights into the role of PC in FeS-mediated pollutant transformation processes and underscore its potential to enhance the natural attenuation of environmental pollutants through galvanic effect.
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