Synthesis of Fe-doped Bi^sub 2^O3 nanocatalyst and its sonophotocatalytic activity on synthetic dye and real textile wastewater

The catalysts such as Fe, Bi2O3, and Fe-doped Bi2O3 were synthesized for the sonophotocatalytic treatment of synthetic dye and real textile wastewater. The resultant catalysts were characterized for its size and uniform shape using x-ray diffractogram (XRD) and scanning electron microscopy (SEM) whi...

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Bibliographic Details
Published in:Environmental science and pollution research international 2016-10, Vol.23 (20), p.20100
Main Authors: Dinesh, G Kumaravel, Anandan, Sambandam, Sivasankar, Thirugnanasambandam
Format: Article
Language:English
Subjects:
Catalysts
Caustic soda
Chemical oxygen demand
Color removal
Dyes
Efficiency
Environmental monitoring
Environmental science
Hydrogen peroxide
Nanoparticles
Organic carbon
Oxidation
Oxidizing agents
Photocatalysis
Photolysis
Pollutants
Studies
Textile industry wastewaters
Textiles
Ultrasonic imaging
Ultraviolet radiation
Water treatment
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Summary:The catalysts such as Fe, Bi2O3, and Fe-doped Bi2O3 were synthesized for the sonophotocatalytic treatment of synthetic dye and real textile wastewater. The resultant catalysts were characterized for its size and uniform shape using x-ray diffractogram (XRD) and scanning electron microscopy (SEM) which signified the nanorod shape formed Bi2O3. The higher ultraviolet light absorbance capacity of the catalysts was also evident using diffuse reflectance spectroscopy (DRS). Initially, the effect of conventional parameters such as initial pH, gas bubbling (argon, oxygen, air and nitrogen) and oxidant addition (H2O2 and peroxymonosulfate) in the presence of sonolysis (22 and 37 kHz frequency) and photolysis (UV-C light) on 10 ppm Basic Brown 1 dye was studied. The results showed that highest decolorization of 62 % was attained for 3 g/L peroxymonosulfate under 37 kHz frequency sonolysis treatment. Secondly, with the catalyst study, highest of 46 % dye color removal was obtained with 4 g/L Fe under 37 kHz frequency sonolysis treatment. The sonophotocatalytic treatment of dye with Fe-doped Bi2O3 catalyst in combination with peroxymonosulfate showed highest color removal of 99 %. Finally, the sonophotocatalytic treatment of real textile wastewater in the presence of 3 g/L Fe-doped Bi2O3 and 6 g/L peroxymonosulfate reduced the total organic carbon (TOC) and chemical oxygen demand (COD) level to 77 and 91 %, respectively, in 180 min. The reported treatment process was found to treat the synthetic dye and real textile wastewater effectively.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-015-5951-z