Journal
CHEMICAL ENGINEERING JOURNAL
Volume 285, Issue -, Pages 459-466Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.09.078
Keywords
Iron-based nanoparticles; Degradation; MC-LR; Characterization; Mechanism
Categories
Funding
- Fujian Normal University
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Microcystin-LR (MC-LR) as a drinking water contaminant was degraded using iron-based nanoparticles such as nZVI, Fe/Ni and Fe/Pd. Batch experiments showed that 28.0% of MC-LR with the initial concentration of 5 mg L-1 was removed using nZVI, while more than 90% of MC-LR was removed using either bimetallic Fe/Ni or Fe/Pd after degrading for 120 min. In addition, the results indicated that Fe was oxided to iron oxide or hydroxide after reacting with MC-LR, while Ni or Pd acted as the catalysis to prevent Fe corrosion and generating hydrogen via water reduction. Degradation of MC-LR by iron-based nanoparticles fitted well to the pseudo-first order kinetic model and the degradation was a diffusion-controlled reaction with low activation energies (8-21 kJ mol(-1)). Finally, the degradation mechanisms of MC-LR using iron-based nanoparticles were proposed according to the LC-MS analysis. In nZVI case, when the MC-LR was quickly adsorbed on nanoparticles, electron transfer and H-2 generated from iron corrosion were generated and broke down the Adda composition of MC-LR. Based on corrosion in the Fe-0-H2O system, bimetallic Fe/Ni and Fe/Pd further utilized the abundant hydrogen radical decomposed from H-2 under the catalysis of Ni or Pd, and destroyed the Adda to form small molecules. (C) 2015 Elsevier B.V. All rights reserved.
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