Abstract
Visible-light-assisted photodegradation of an azo dye, Reactive Red 180 (RR180), in the presence of nitrogen-doped TiO2 (N-TiO2) has been studied. The photodegradation of RR180 is evaluated through decolorization studies and total organic carbon analysis. The efficacy of hydrogen peroxide (H2O2), potassium peroxomonosulfate (oxone or PMS), and potassium peroxodisulfate (PDS) in improving the photodegradation of the dye in the N-TiO2-RR180 system is also examined. The effect of combining photo-Fenton-like reaction with N-TiO2-mediated photodegradation of RR180 under visible light has been investigated. The photoactivity of N-TiO2-RR180-Fe3+/Cu2+-oxidant systems is compared with the individual techniques of photocatalysis and photo-Fenton-like reactions. The coupled system possesses superior photomineralization ability towards the abatement of RR180.
Highlights
A days, combining several oxidation systems for the degradation and mineralization of organic pollutants has become a common practice, for the reason that a single process usually cannot reach a desirable effectiveness in the degradation and mineralization of organic pollutants
Heterogeneous photocatalysis using titania photocatalyst has been established as a principal advanced oxidation process (AOP) for wastewater treatment
In the paired system with oxidants (N-TiO2-oxidant dye + Fe3+/Cu2+ oxidant dye coupled system), complete decolorization of Reactive Red 180 (RR180) was achieved within 30 min visiblelight illumination whereas in the individual systems longer duration was required for attaining complete decolorization
Summary
A days, combining several oxidation systems for the degradation and mineralization of organic pollutants has become a common practice, for the reason that a single process usually cannot reach a desirable effectiveness in the degradation and mineralization of organic pollutants. Heterogeneous photocatalysis using titania photocatalyst has been established as a principal advanced oxidation process (AOP) for wastewater treatment. The efficiency of photocatalytic process is limited by the recombination of photogenerated electrons and holes in the semiconductor phase. It can be suppressed by the addition of suitable scavengers of particular charge carriers. The potential of coupled systems composed of nitrogendoped titania or pure TiO2 (Degussa P25), metal ions (Fe3+ or Cu2+) and oxidants, namely, potassium peroxomonosulfate (PMS), potassium peroxodisulfate (PDS), and hydrogen peroxide (H2O2) towards the mineralization of RR180 under visible light is examined.
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