Paper
Oxalate-assisted oxidative degradation of 4-chlorophenol in a bimetallic, zero-valent iron–aluminum/air/water system
Published May 16, 2016 · DOI · Jinhong Fan, Hong-wu Wang, Luming Ma
Environmental Science and Pollution Research
11
Citations
0
Influential Citations
Abstract
The reaction of zero-valent iron and aluminum with oxygen produced reactive oxidants that can oxidize 4-chlorophenol (4-CP). However, oxidant yield without metal surface cleaning to dissolve the native oxide layer or in the absence of ligands was too low for practical applications. The addition of oxalate (ox) to dissolved oxygen-saturated solution of Fe0–Al0 significantly increased oxidant yield because of the dissolution, pH buffer, and complexing characteristics of ox. Ox-enhanced reactive oxidant generation was affected by ox concentration and solution pH. The critical effect of ox dosing was confirmed with the reactive species of [FeII(ox)0] and [FeII(ox)22−]. Systematic studies on the effect of the initial and in situ solution pH revealed that 4-CP oxidation was controlled by the continuous release of dissolved Fe2+ and Al3+, their fate, and the activation mechanisms of O2 reduction. The degradation pathway of 4-CP in ox-enhanced Fe0–Al0/O2 may follow the 4-chlorocatechol pathway. The robustness of the ox-enhanced Al0–Fe0–O2 process was determined with one-time dosing of ox. Therefore, ox is an ideal additive to enhancing the Fe0–Al0/O2 system for the oxidative degradation of aqueous organic pollutants.
Oxalate-assisted oxidative degradation of 4-chlorophenol in a bimetallic, zero-valent iron-aluminum/air/water system significantly increases oxidant yield for practical applications.
Full text analysis coming soon...