- Title
- Comparison of degradation mechanisms of microcystin-LR using nanoscale zero-valent iron (nZVI) and bimetallic Fe/Ni and Fe/Pd nanoparticles
- Creator
- Gao, Ying; Wang, Feifeng; Wu, Yan; Naidu, Ravendra; Chen, Zuliang
- Relation
- Chemical Engineering Journal Vol. 285, Issue February 2016, p. 459-466
- Publisher Link
- http://dx.doi.org/10.1016/j.cej.2015.09.078
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2016
- Description
- 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 5mgL-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 120min. In addition, the results indicated that Fe⁰ was oxided to iron oxide or hydroxide after reacting with MC-LR, while Ni or Pd acted as the catalysis to prevent Fe⁰ 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 (8-21kJmol-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 H₂ generated from iron corrosion were generated and broke down the Adda composition of MC-LR. Based on corrosion in the Fe⁰-H₂O system, bimetallic Fe/Ni and Fe/Pd further utilized the abundant hydrogen radical decomposed from H₂ under the catalysis of Ni or Pd, and destroyed the Adda to form small molecules.
- Subject
- iron-based nanoparticles; degradation; MC-LR; characterization; mechanism
- Identifier
- http://hdl.handle.net/1959.13/1320066
- Identifier
- uon:24053
- Identifier
- ISSN:1385-8947
- Language
- eng
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