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- Title
Sequential removal of phenol and As(V) from contaminated water by ferrate (Fe(VI)) under neutral pH conditions.
- Authors
Debo Wu; Xingmin Gao; Shuiping Yang; Winston Duo Wu
- Abstract
Sequential removal of phenol and As(V) from co-contaminated water by ferrate (Fe(VI)) was investigated. The results showed that a neutral pH condition favored the sequential of phenol and As(V) by Fe(VI). Around 70% of phenol was removed at neutral pHs with a Fe(VI): phenol molar ratio of 10:1. While about 50% of As(V) was finally removed under similar conditions. The presence of a high concentration of Cl- (up to 0.2 M) showed 6% inhibitory effect on the final removal percentage of phenol compared to that without Cl-. Fourier transform infrared spectroscopy, X-ray powder diffraction, and X-ray photoelectron spectroscopy analyses suggested that As(V) was removed through adsorption by the precipitates (amorphous iron (oxy)hydroxide), while phenol was removed via degradation (89%) and adsorption (11%), respectively. Removal of As(V) occurred immediately when phenol degradation was initiated, indicating a rapid generation of Fe(III)- (oxy)hydroxide. Our study also revealed that an excessive amount of Fe(III) ions in the aqueous phase did not facilitate the degradation of phenol. On the other hand, improving the precipitation rate of Fe(III) could further improve the removal efficiency of phenol and As(V).
- Subjects
WATER pollution; FOURIER transform infrared spectroscopy; X-ray powder diffraction; X-ray photoelectron spectroscopy; PHENOL
- Publication
Desalination & Water Treatment, 2020, Vol 196, p271
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2020.25939