Xin Liu, Jinhong Fan, Luming Ma
Jan 15, 2014
Citations
0
Influential Citations
36
Citations
Journal
Chemical Engineering Journal
Abstract
Abstract Oxidative degradation of 4-chlorophenol in aqueous solution at normal temperature and pressure by the bimetallic Al–Fe/O 2 was investigated. The proposed main mechanism, verified by the addition of methanol and benzoic acid as OH scavenger and the detection of para-hydroxybenzoic acid, involves the in situ generation of H 2 O 2 by the electron transfer from ZVAl to O 2 , and the Fenton reaction occurring within ZVI and H 2 O 2 . The effects of initial pH, concentration of 4-chlorophenol and ethylenediaminetetraacetic acid, Fe 0 content and Al–Fe loading were investigated. The results showed that the bimetallic Al–Fe/O 2 process exhibited higher reactivity than ZVAl/O 2 and ZVI/O 2 process and the 50 mg L −1 of 4-CP could be completely degraded in 2 h with the 100:1 mass ratio of Al and Fe. EDTA significantly enhanced the degradation of 4-CP with the optimized 1:1 mass ratio of Al and Fe while its appropriate initial concentration needed to be optimized. The degradation pathway of 4-CP in Al–Fe/O 2 may only follow 4-chlorocatechol pathway, while it may contain hydroquinone pathway in Al–Fe/O 2 + EDTA.