Oxidizing capacity of periodate activated with iron-based bimetallic nanoparticles.
Environ Sci Technol
; 48(14): 8086-93, 2014 Jul 15.
Article
in En
| MEDLINE
| ID: mdl-24896837
ABSTRACT
Nanosized zerovalent iron (nFe0) loaded with a secondary metal such as Ni or Cu on its surface was demonstrated to effectively activate periodate (IO4-) and degrade selected organic compounds at neutral pH. The degradation was accompanied by a stoichiometric conversion of IO4- to iodate (IO3-). nFe0 without bimetallic loading led to similar IO4- reduction but no organic degradation, suggesting the production of reactive iodine intermediate only when IO4- is activated by bimetallic nFe0 (e.g., nFe0-Ni and nFe0-Cu). The organic degradation kinetics in the nFe0-Ni(or Cu)/IO4- system was substrate dependent 4-chlorophenol, phenol, and bisphenol A were effectively degraded, whereas little or no degradation was observed with benzoic acid, carbamazepine, and 2,4,6-trichlorophenol. The substrate specificity, further confirmed by little kinetic inhibition with background organic matter, implies the selective nature of oxidant in the nFe0-Ni(or Cu)/IO4- system. The comparison with the photoactivated IO4- system, in which iodyl radical (IO3â¢) is a predominant oxidant in the presence of methanol, suggests IO3⢠also as primary oxidant in the nFe0-Ni(or Cu)/IO4- system.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Periodic Acid
/
Nanoparticles
/
Iron
Language:
En
Journal:
Environ Sci Technol
Year:
2014
Document type:
Article