Abstract
In view of the fatal illnesses caused by methylene blue (MB) which is contained in the dye wastewater, the present study focused on the use of natural sunlight in heterogeneous photocatalysis to decolorize and degrade MB. The present study also investigated the effects of enhancers (hydrogen peroxide and persulfate ion) and inhibitors (chloride and carbonate ions) on photodecolorization of MB. Pseudo-first-order rate constants for each studied effect were determined through Langmuir-Hinshelwood model. The recommended conditions to photodecolorize 60 ppm of MB under natural sunlight were 1.0 g/L of titanium dioxide nanopowder at initial pH 10.5 in order to achieve 85.3 % decolorization (rate constant of 10.8 × 10−3 min−1). The addition of 4,080 ppm of hydrogen peroxide and persulfate ion significantly enhanced the decolorization efficiency up to 96.6 and 99.3 %, respectively (rate constants of 66.2 and 91.0 × 10−3 min−1, respectively). However, the addition of 2,000 ppm of chloride and carbonate ions reduced the decolorization efficiency of MB to 74.7 and 70.2 %, respectively (rate constants of 7.8 and 7.3 × 10−3 min−1, respectively). The present study implied that it was possible to use natural sunlight as a light source for photocatalytic treatment of dye in tropical countries like Malaysia.
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Acknowledgments
The authors would like to thank Monash University Malaysia for providing W. Subramonian with a PhD scholarship.
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Subramonian, W., Wu, T.Y. Effect of Enhancers and Inhibitors on Photocatalytic Sunlight Treatment of Methylene Blue. Water Air Soil Pollut 225, 1922 (2014). https://doi.org/10.1007/s11270-014-1922-0
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DOI: https://doi.org/10.1007/s11270-014-1922-0
Keywords
- Carbonate ion
- Chloride ion
- Dye wastewater
- Hydrogen peroxide
- Persulfate ion
- Photocatalysis