TY - JOUR
T1 - Effect of additives on ozone-based decomposition of Reactive Black 5 and Direct Red 28 dyes
AU - Pérez, A.
AU - Poznyak, T.
AU - Chairez, I.
PY - 2013/4
Y1 - 2013/4
N2 - In this research, ozonation of Reactive Black 5 (RB5) and Direct Red 28 (DR28) under the presence of Na2SO4 and Na 2CO3 used as textile additives was investigated. The effect of these salts on discoloration, degradation dynamics, and the composition of the final compounds were studied. Different systems were evaluated; such as RB5-Na2SO4 (100 g/L), RB5-Na 2CO3 (30 g/L), RB5-Na2SO4/Na 2CO3 (100 g/L/30 g/L), and DR28-Na2SO 4 (10 g/L, 40 g/L, and 80 g/L) with dye concentrations of 50, 150, and 250 mg/L without pH adjustment. Discoloration of RB5 and DR28 with and without additives was determined by visible and UV (UV-Vis) spectroscopy. Decomposition of the dyes and the dynamics of intermediates and final byproducts were followed by high performance liquid chromatography. The presence of additives accelerated discoloration and decomposition for both dyes (more than 50% ). The accumulation of oxalic and formic acids was observed. Possible mechanism schemes of ozonation for both dyes are proposed.
AB - In this research, ozonation of Reactive Black 5 (RB5) and Direct Red 28 (DR28) under the presence of Na2SO4 and Na 2CO3 used as textile additives was investigated. The effect of these salts on discoloration, degradation dynamics, and the composition of the final compounds were studied. Different systems were evaluated; such as RB5-Na2SO4 (100 g/L), RB5-Na 2CO3 (30 g/L), RB5-Na2SO4/Na 2CO3 (100 g/L/30 g/L), and DR28-Na2SO 4 (10 g/L, 40 g/L, and 80 g/L) with dye concentrations of 50, 150, and 250 mg/L without pH adjustment. Discoloration of RB5 and DR28 with and without additives was determined by visible and UV (UV-Vis) spectroscopy. Decomposition of the dyes and the dynamics of intermediates and final byproducts were followed by high performance liquid chromatography. The presence of additives accelerated discoloration and decomposition for both dyes (more than 50% ). The accumulation of oxalic and formic acids was observed. Possible mechanism schemes of ozonation for both dyes are proposed.
KW - Discoloration and decomposition
KW - Effect of additives
KW - Ozonation of reactive and direct dyes
UR - http://www.scopus.com/inward/record.url?scp=84878754737&partnerID=8YFLogxK
U2 - 10.2175/106143013X13596524515988
DO - 10.2175/106143013X13596524515988
M3 - Artículo
SN - 1061-4303
VL - 85
SP - 291
EP - 300
JO - Water Environment Research
JF - Water Environment Research
IS - 4
ER -