Treatment of a reactive dye, a disperse dye, and their mixtures using H2O2/pyridine/Cu (II) system
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Date
2009-07
Authors
Lim, Chooi Ling
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Abstract
The I-h02/pyridine/Cu(II) system is a series of advanced oxidation processes
involving the use of a chelating ligand, combined with a transition metal, forming the
transition metal complexes to produce reactive radicals. This system was used to
assess the efficiency of the treatment of a 1 giL synthetic dye wastewater comprising
of a reactive dye, (Cibacron Red FN-R), a disperse dye (Terasil Red R), mixtures of
a reactive dye (RO) and a disperse dye (DO) in three different ratios (RD: DO =
0.25: 0.75,0.50: 0.50, and 0.75: 0.25), and a real industrial dye wastewater. Reactive
and disperse dye powders were selected to be used in this study as these two dyes are
used widely as compared to dyes from other classes due to their superior
performance. Experimental results are assessed in terms of percentage chemical
oxygen demand (COD) reduction, decolourization, and the amount of sludge
produced. Optimal operating parameters were obtained using statistical design of
experiment. The optimal parameters were 0.059 M [H202]/ 0.087 M [pyridine]/
0.0171 M [CuOI)] for reactive dye wastewater, 0.0055 M [H20 2]/ 0.038 M
[pyridine]/ 0.00168 M [Cu(II)] for synthetic disperse dye wastewater, 0.004 M
[H20 2]/ 0.05 M [pyridine]/ 0.0186 M [Cu(II)] for (RD: DD = 0.75:0.25), 0.024 M
[H20 2]/ 0.106 M [pyridine]/ 0.019 M [Cu(IJ)] for (RD: DD = 0.50:0.50),0.002 M
[H20 2]/ 0.066 M [pyridine]/ 0.0018 M [Cu(lI)] for (RD: DD = 0.25:0.75), and pH 10/
0.0023 M [H20 2]/ 0.0073 M [pyridine]/ 0.0123 M [Cu(n)] for industrial dye
wastewater. This system was found to be capable in reducing the concentration of
COD of the dye wastewater within the range of 73 % - 92%, and achieving 93 % -
99 % in dccolourization at the respective optimal conditions of process variables of
the wastewaters being studied, while the amount of sludge produced for synthetic
dyes was within the range 20 mg/L - 330 mg/L, and industrial dye wastewater at 260
mg/L - 555 mg/L. Full 24 factorial design and the response surface methodology
using central composite design (CCD) were utilized in the screening and
optimization of this study. Treatment efficiency was found to be pH independent for
all synthetic dyes.
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Keywords
The I-h02/pyridine/Cu(II) system is a series of advanced oxidation processes , involving the use of a chelating ligand