Activation of persulfate by FeIII species: Implications for 4-tert-butylphenol degradationReportar como inadecuado

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1 Tongji University 2 ICCF - Institut de Chimie de Clermont-Ferrand 3 ISCR - Institut des Sciences Chimiques de Rennes 4 Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention

Abstract : In this study the activation of persulfate induced by FeIII species, including 5 kinds of iron oxhydroxides IOs and dissolved Fe3+ under dark condition were investigated. Ferrihydrite FH and akaganeite AK showed the highest activity in 4-tert-butylphenol 4tBP removal. The 4tBP degradation rate constant decreased as the solution pH increased from pH 3.2 to 7.8 in FH-S2O82- system. However, the pH value had no significant effect on the 4tBP degradation in AK-S2O82- system. The degradation of 4tBP in Fe3+-S2O82- system was also performed to investigate the role of ferric species in persulfate activation. The pH dependency of 4tBP degradation rate was closely related to the speciation of Fe-III, whereas the FeH2O63+ was found to be the most active soluble iron complex form in the activation of S2O82-. 4tBP degradation was mainly due to the SO4 center dot- in IOs-S2O82- system, while SO4 center dot- and HO2 center dot both had great contribution on 4tBP degradation in Fe3+-S2O82- system. Further investigations showed clearly that 4tBP degradation efficiency was decreased significantly due to the trapping of SO4 center dot- by chloride. This finding may have promising implications in developing a new technology for the treatment of contaminated waters and soils, especially where Fe3+ species are naturally occurring.

Keywords : endocrine disrupting compounds aqueous-solution radical generation hydrogen-peroxide peroxydisulfate activation mniv-containing oxides catalytic decomposition chemical oxidation surface waters ferrous ion

Autor: Yanlin Wu - Romain Prulho - Marcello Brigante - Wenbo Dong - Khalil Hanna - Gilles Mailhot -



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