Naphthalene degradation by Fe2+/Oxone/UV – Applying an unconventional kinetics model and studying the reaction mechanism
作者： H.L. So , W. Chu , Y.H. Wang
DOI: 10.1016/J.CHEMOSPHERE.2018.11.091
关键词:
摘要: Abstract This study shows the degradation of naphthalene (Nap) in aqueous solution using Oxone process mediated by Fe2+ with UV-A irradiation (FOU). To elucidate role different parameters, Fe2+/Oxone (FO), Fe2+/UV (FU), Oxone/UV (OU) and direct photolysis processes were studied, separately. The efficiency under dosage Fe2+, Oxone, initial probe compound concentration pH evaluated. It is concluded that FOU has significantly better capacity efficiency. More than 90% 0.125 mM Nap was removed 20 min, optimal conditions ([Fe2+]0 = 0.250 mM, [Oxone]0 = 0.250 mM, wavelength = 350 nm pH = 2.8). A mathematical model proposed to describe two-stage reaction kinetics involving Oxone. alleviate problems radical surge at stage a deficit later stage, stepwise addition oxidants conducted achieved higher removal performance. Besides, decay pathways LC-ESI/MS analysis. TOC content found be increased initially decreased after 2 h reaction. clarified increment contributed partially degraded intermediates rather persistent Nap, since latter not completely combustible analyzer, demonstrating effective degrading into more degradable products such naphthoic acids aldehydes.
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