Degradation of sulfamonomethoxine with Fe3O4 magnetic nanoparticles as heterogeneous activator of persulfate.
Iron oxide magnetic nanoparticles (Fe(3)O(4) MNPs) can effectively activate persulfate anions (S(2)O(8)(2-)) to produce sulfate free radicals (SO(4)(-)), which are a powerful oxidant with promising applications to degrade organic contaminants. The kinetics of sulfamonomethoxine (SMM) degradation was studied in the system of Fe(3)O(4) MNPs and S(2)O(8)(2-). A complete removal of the added SMM (0.06 mmol L(-1)) was achieved within 15 min with the addition of 1.20 mmol L(-1) S(2)O(8)(2-) and 2.40 mmol L(-1) Fe(3)O(4) MNPs. There is an optimum concentration of Fe(3)O(4) MNPs because Fe(3)O(4) MNPs may also act as a SO(4)(-) scavenger at higher concentrations. It was further observed that the addition of Fe(3)O(4) MNPs in several batches for a given total amount of the activator is favorable to enhancing the degradation of SMM. A degradation mechanism was proposed on the basis of identification of the degradation intermediates of SMM with liquid chromatography combined with mass spectroscopy.
College of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Jingchun
J
Yan
Min
M
Lei
Lihua
L
Zhu
M Naveed
MN
Anjum
Jing
J
Zou
Heqing
H
Tang
D000900:Anti-Bacterial Agents / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D004785:Environmental Pollutants / Q000032:analysis; D005290:Ferric Compounds / Q000737:chemistry*; D007202:Indicators and Reagents; D007700:Kinetics; D008280:Magnetics; D013058:Mass Spectrometry; D053758:Nanoparticles; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet; D013422:Sulfamonomethoxine / Q000737:chemistry*; D013431:Sulfates / Q000737:chemistry*; D014961:X-Ray Diffraction
D000900:Anti-Bacterial Agents; D004785:Environmental Pollutants; D005290:Ferric Compounds; D007202:Indicators and Reagents; D013431:Sulfates; C000499:ferric oxide; D013422:Sulfamonomethoxine