Visible Light Harvesting Titania-Coated Diatom Frustules with Superior Photocatalytic Activity

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 435)

Abstract

Porous silica frustules of diatoms are naturally occurring microcellular, solar light harvesting hierarchical structures. In this work, titania-deposited diatom frustule is presented as a heterogeneous catalyst having high efficiency for photodegradation of major pollutants under visible light irradiation. The heterogeneous catalyst is synthesized by depositing titania nanoparticles in the pores and surface of diatom frustules by solgel method and is characterized by XRD, UV–visible absorption spectroscopy, SEM, and TEM. Increase in crystallite size with the transformation of titania phase at high-temperature synthesis is confirmed by XRD. UV–visible spectra reveal that synthesized catalysts exhibit absorption in the visible light range and are able to perform catalytic activity for the degradation of azo-dyes. The effect of photocatalyst on dye concentration in aqueous solution and presence of anatase–rutile titania phases are also presented. As-prepared catalysts responsive to visible light could be a promising candidate in application of environment remediation by harvesting solar energy with the use of the morphology of diatom frustules and presence of nano titania phases in it.

Keywords

Diatom frustule Mixed phase Band gap Rate constant Degradation 

References

  1. 1.
    Molla, A., Sahu, M., Hussain, S.: Synthesis of tunable band semiconductor nickel sulphide nanoparticles: rapid and round the clock degradation of organic dyes. Sci. Rep. 6, 26034 (2016)CrossRefGoogle Scholar
  2. 2.
    Qin, X.D., Zhu, Z.W., Liu, G., Fu, H.M., Zhang, H.W., Wang, A.M., Li, H., Zhang, H.F.: Ultrafast degradation of azo dyes catalyzed by cobalt-based metallic glass. Sci. Rep. 5, 18226 (2015)CrossRefGoogle Scholar
  3. 3.
    Yang, X., Chen, W., Huang, J., Zhou, Y., Zhu, Y., Li, C.: Rapid degradation of methylene blue in a novel heterogeneous Fe3O4@rGO@TiO2-catalyzed photo-Fenton system. Sci. Rep. 5, 10632 (2015)CrossRefGoogle Scholar
  4. 4.
    Dariani, R.S., Esmaeili, A., Mortezaali, A., Dehghanpour, S.: Photocatalytic reaction and degradation of methylene blue on TiO2 nano-sized particles. Optik 127, 7143–7154 (2016)CrossRefGoogle Scholar
  5. 5.
    Makama, A.B., Salmiaton, A., Saion, E.B., Choong, T.S.Y., Abdullah, N.: Synthesis of CdS sensitized TiO2 photocatalysts: methylene blue adsorption and enhanced photocatalytic activities. Int. J. Photoenergy 2016, 2947510 (2016)CrossRefGoogle Scholar
  6. 6.
    Abbasi, A., Ghanbari, D., Salavati-Niasari, M., Hamadanian, M.: Photo-degradation of methylene blue: photocatalyst and magnetic investigation of Fe2O3–TiO2 nanoparticles and nanocomposites. J. Mater. Sci. Mater. Electron. 27, 4800–4809 (2016)CrossRefGoogle Scholar
  7. 7.
    Ibhadon, A.O., Fitzpatrick, P.: Heterogeneous photocatalysis: recent advances and applications. Catalysts 3, 189–218 (2013)Google Scholar
  8. 8.
    He, J., Chen, D., Li, Y., Shao, J., Xie, J., Sun, Y., Yan, Z., Wang, J.: Diatom-templated TiO2 with enhanced photocatalytic activity: biomimetics of photonic crystals. Appl. Phys. A 113, 327–332 (2013)CrossRefGoogle Scholar
  9. 9.
    De Tommasi, E., Rea, I., De Stefano, L., Dardano, P., Di Caprio, G., Ferrara, M.A., Coppola, G.: Optics with diatoms: towards efficient, bioinspired photonic devices at the micro-scale. SPIE Proc 8792, 87920O-1 (2014)Google Scholar
  10. 10.
    Noyes, J., Sumper, M., Vukusic, P.: Light manipulation in a marine diatom. J. Mater. Res. 23, 3229–3235 (2008)CrossRefGoogle Scholar
  11. 11.
    Gogoi, A., Buragohain, A.K., Choudhury, A., Ahmed, G.A.: Laboratory measurements of light scattering by tropical fresh water diatoms. J. Quant. Spectrosc. Radiat. Transfer 110, 1566–1578 (2009)CrossRefGoogle Scholar
  12. 12.
  13. 13.
    Paul, S., Choudhury, A.: Investigation of the optical property and photocatalytic activity of mixed phase nanocrystalline titania. Appl. Nanosci. 4, 839–847 (2014)CrossRefGoogle Scholar
  14. 14.
    Lopez, R., Gomez, R.: Band-gap energy estimation from diffuse reflectance measurements on sol–gel and commercial TiO2: a comparative study. J. Sol-Gel. Sci. Technol. 61, 1–7 (2012)CrossRefGoogle Scholar
  15. 15.
    Mao, L., Liu, J., Zhu, S., Zhang, D., Chen, Z., Chen, C.: Sonochemical fabrication of mesoporous TiO2 inside diatom frustules for photocatalyst. Ultrason. Sonochem. 21, 527–534 (2014)CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Department of PhysicsTezpur UniversityTezpurIndia

Personalised recommendations