DEGRADATION OF CONGO RED DYE IN AQUEOUS SOLUTION BY USING ADVANCED OXIDATION PROCESSES
Keywords:
azo dye, congo red, Fenton process, titanium dioxideAbstract
Degradation of azo dyes by using advanced oxidation processes (AOPs) was conducted. In this
approach, different AOPs, which are Fenton process and titanium dioxide (TiO2) catalyst, were
examined and compared for the degradation of an azo dye (i.e., Congo red dye). The sample was tested
under UV light and the experiment was conducted for 90 min with 15 min interval. The degradation
rate of dye was determined using UV-Vis spectrophotometry. The effect of several parameters on the
degradation process such as the concentration of metal ions (Fe2+, Cu2+, and Mn2+) as the catalyst in
Fenton process, the concentration of hydrogen peroxide (H2O2), the mass of TiO2, and pH value of the
dye solution were investigated. The initial Congo red concentration used for both techniques was 5
ppm. The results showed that the percentage degradation followed the sequence of H2O2/Fe2+/UV,
H2O2/Cu2+/UV, H2O2/Mn2+/UV, and TiO2/UV. The best operating conditions for H2O2/Fe2+/UV were pH
3, 0.2 M concentration of H2O2, and 0.02 M concentration of metal ion in 15 min, which achieved
99.92% degradation of dye. The Fourier transform infrared (FTIR) spectrum showed the absence of azo
bond (N=N) peak after degradation process, which indicates the successful cleavage of azo bond in the
chemical structure of Congo red.
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