Visible light-driven photocatalytic degradation of methylene blue dye over bismuth-doped cerium oxide mesoporous nanopar
- PDF / 3,386,193 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 26 Downloads / 227 Views
RESEARCH ARTICLE
Visible light-driven photocatalytic degradation of methylene blue dye over bismuth-doped cerium oxide mesoporous nanoparticles Sajith N. Veedu 1 & Sheethu Jose 1 & Soumya B. Narendranath 1 & Maliyeckal R. Prathapachandra Kurup 1 & Pradeepan Periyat 2,3 Received: 27 February 2020 / Accepted: 6 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A series of Bi3+-doped ceria nanoparticles (0 to 20 wt% of Bi3+) were synthesized by sol-gel assisted hydrothermal method at a lower temperature of 150 °C. The synthesized nanoparticles were found to be effective photocatalysts for the degradation of methylene blue dye under visible light irradiation. The synthesized photocatalysts were well characterized by crystallographic, microscopic and spectroscopic methods. XRD patterns showed that the developed photocatalysts have cubic fluorite structure, and the absence of any impurity peaks in the XRD patterns of doped samples emphasizes the effective doping in host lattice. All samples exhibited mesoporous nature as evident from the adsorption and desorption pore size measurement. The shift of band gap energy from UV to visible region (2.90–2.77 eV) of the undoped and doped ceria results in the photo degradation of methylene blue dye in the visible light. Keywords Cerium oxide . Visible light . Photocatalysis . Doping . Sol-gel . Degradation . Hydrothermal method . Mesoporous . Methylene blue
Introduction Nowadays, an extensive number of research studies are reported in the development of suitable materials for the removal of recalcitrant organic pollutants and effluents from the textile industry, especially the organic dyes, which contribute towards the major source of water contamination (De Lima et al. 2017). About 50% of the dyes used on textile fiber are not fixed on it; instead, they remain as pollutant in water bodies (Yuan et al. 2020). Untreated dye pollutants in water Responsible Editor: Sami Rtimi Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-10750-y) contains supplementary material, which is available to authorized users. * Pradeepan Periyat [email protected]; [email protected] 1
Department of Chemistry, Central University of Kerala, Kerala 671316, India
2
Department of Chemistry, University of Calicut, Kerala 673 635, India
3
Department of Environmental Science, Kannur University, Kannur 670 567, India
not only affect the appearance of water, it also inhibits the passage of light through them, which decreases the rate of photosynthesis and amount of dissolved oxygen, resulting in an increase in the value of COD and BOD causing undesirable impacts on aquatic life (Katheresan et al. 2018). To resolve such complication, conventional methods namely adsorption, coagulation, ion-exchange, and enzyme degradation are inefficient for the complete mineralization of dye effluents, as these methods bring about secondary pollutants like toxic gases and sludge which require additional processing (Balcha et
Data Loading...
