In this work, the decolorization of azo dye Orange G (OG) in aqueous solution by aluminum powder
enhanced by ultrasonic irradiation (AlP-UI) was investigated. The effects of various operating operational
parameters such as the initial pH, initial OG concentration, AlP dosage, ultrasound power and added
hydrogen peroxide (H2O2) concentration were studied. The results showed that the decolorization rate
was enhanced when the aqueous OG was irradiated simultaneously by ultrasound in the AlP-acid sys-tems. The decolorization rate decreased with the increase of both initial pH values of 2.0–4.0 and OG ini-tial concentrations of 10–80 mg/L, increased with the ultrasound power enhancing from 500 to 900 W.
An optimum value was reached at 2.0 g/L of the AlP dosage in the range of 0.5–2.5 g/L. The decolorization
rate enhanced significantly by the addition of hydrogen peroxide in the range of 10–100 mM to AlP-UI
system reached an optimum value of 0.1491 min
1
. The decolorization of OG appears to involve primarily
oxidative steps, the cleavage of N@N bond, which were verificated by the intermediate products of OG
under the optimal tested degradation system, aniline and 1-amino-2-naphthol-6,8-disulfonate detected
by the LC–MS.
2014 Elsevier B.V. All rights reserved
In this work, the decolorization of azo dye Orange G (OG) in aqueous solution by aluminum powder
enhanced by ultrasonic irradiation (AlP-UI) was investigated. The effects of various operating operational
parameters such as the initial pH, initial OG concentration, AlP dosage, ultrasound power and added
hydrogen peroxide (H2O2) concentration were studied. The results showed that the decolorization rate
was enhanced when the aqueous OG was irradiated simultaneously by ultrasound in the AlP-acid sys-tems. The decolorization rate decreased with the increase of both initial pH values of 2.0–4.0 and OG ini-tial concentrations of 10–80 mg/L, increased with the ultrasound power enhancing from 500 to 900 W.
An optimum value was reached at 2.0 g/L of the AlP dosage in the range of 0.5–2.5 g/L. The decolorization
rate enhanced significantly by the addition of hydrogen peroxide in the range of 10–100 mM to AlP-UI
system reached an optimum value of 0.1491 min
1
. The decolorization of OG appears to involve primarily
oxidative steps, the cleavage of N@N bond, which were verificated by the intermediate products of OG
under the optimal tested degradation system, aniline and 1-amino-2-naphthol-6,8-disulfonate detected
by the LC–MS.
2014 Elsevier B.V. All rights reserved
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