Electromagnetically Catalytical Degradation of Algogenic Odor

Abstract:

Geosmin is one of the typical musty odor compounds produced by various blue-green algae (cyanobacteria) and filamentous bacteria. These algogenic micropollutants pose threats to the ecological safety and water quality. The present study evaluated a novel electromagnetical catalysis that achieved an enhanced removal performance. Electromagnetic catalysis is an emerging technology that utilizes the electromagnetic wave or fields to induce surface reactions (e.g., localized heating, radical formation and plasmonic oscillation) for pollutant degradation. The effects of electromagnetic field (strength and frequencies), H₂O₂ and Fe₃O₄ nanoparticle catalyst doses on the removal efficiency were evaluated with a model pollutant of geosmin and methylene blue as a control comparison. The removal process of methylene blue was well described by the pseudo-second-order kinetic model with the highest reaction rate constant under electromagnetic-Fenton condition. Moreover, the proposed degradation mechanisms were analyzed and primarily attributed to the formation of reactive oxygen species (ROS). The ROS formation is governed by a Fenton-like reaction in our catalytic system. The presented electromagneticl catalysis, compared to similar heterogenous catalysis such as photocatalysis and catalytic ozonation, exhibits a wide range of adaptation, safe and clean production advantages.