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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 1, 2015, pp. 35-44
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Bioline Code: st15003
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 1, 2015, pp. 35-44
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Sonochemical removal of naphthol blue black azo dye: influence of parameters and effect of mineral ions
Dalhatou, S.; Pétrier, C.; Laminsi, S. & Baup, S.
Abstract
Sonochemical degradation at 278 kHz of
naphthol blue black (NBB, a diazo dye widely used in the
textile and soap industries) has been investigated. The
effects of different parameters and the influence of mineral
matrix (bicarbonates ions and phosphates ions) on its
sonodegradation have been evaluated. The influence of
parameters linked to the pollutant (concentration:
0.50–97.32 lmol L-1), to the technique (power:
20–100 W) and to the natural medium (pH 3–10.8; bicarbonate
ions; phosphate ions) has been studied. The decolourisation
rate of NBB increases when substrate
concentration or ultrasound power increases. Bicarbonate
ions at natural medium concentration (2.97 mmol L-1)
have a positive influence for low pollutant concentration
(0.5–2.0 lmol L-1), due to carbonate radicals. Phosphate
ions may also improve the kinetics, but this effect depends
on the pH domains. Furthermore, acid pH (pH 3) has a
positive effect for high pollutant concentration, whereas
basic pH (pH 10.8) has a positive influence at low pollutant
concentration.
Keywords
Naphthol blue black; Azo dye; Ultrasound; Sonochemistry; Bicarbonates ions; Phosphate ions
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