Nanostructured CdS sensitized CdWO4 nanorods for hydrogen generation from hydrogen sulfide and dye degradation under sunlight

Herein, we have demonstrated the synthesis of the monoclinic CdWO4 nanowiresdecorated with hexagonal CdS nanoparticles (nano-heterostructure) by facile solvothermal method and solid state method. The heterostructures have been used as photocatalyst for hydrogen production under solar light. [Display...

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Bibliographic Details
Published in:Journal of colloid and interface science 2017-02, Vol.487, p.504-512
Main Authors: Sethi, Yogesh A., Panmand, Rajendra P., Kadam, Sunil R., Kulkarni, Aniruddha K., Apte, Sanjay K., Naik, Sonali D., Munirathnam, N., Kulkarni, Milind V., Kale, Bharat B.
Format: Article
Language:English
Subjects:
CdWO4
Dye degradation
Hydrogen generation
Photocatalysis
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Summary:Herein, we have demonstrated the synthesis of the monoclinic CdWO4 nanowiresdecorated with hexagonal CdS nanoparticles (nano-heterostructure) by facile solvothermal method and solid state method. The heterostructures have been used as photocatalyst for hydrogen production under solar light. [Display omitted] In this report, CdS nanoparticles have been grown on the surface of CdWO4 nanorods via an in-situ approach and their high photocatalytic ability toward dye degradation and H2 evolution from H2S splitting under visible light has been demonstrated. The structural and optical properties as well as morphologies with varying amount of CdS to form CdS@CdWO4 have been investigated. Elemental mapping and high resolution transmission electron microscopy (HRTEM) analysis proved the sensitization of CdWO4 nanorods by CdS nanoparticles. A decrease in the PL emission of CdWO4 was observed with increasing amount of CdS nanoparticles loading possibly due to the formation of trap states. Considering the band gap in visible region, the photocatalytic study has been performed for H2 production from H2S and dye degradation under natural sunlight. The steady evolution of H2 was observed from an aqueous H2S solution even without noble metal. Moreover, the rate of photocatalytic H2 evolution over CdS modified CdWO4 is ca. 5.6 times higher than that of sole CdWO4 under visible light. CdS modified CdWO4 showed a good ability toward the photo-degradation of methylene Blue. The rate of dye degradation over CdS modified CdWO4 is ca. 7.4 times higher than that of pristine CdWO4 under natural sunlight. With increase in amount of CdS nanoparticle loading on CdWO4 nanorods the hydrogen generation was observed to be decreased where as dye degradation rate is increased. Such nano-heterostructures may have potential in other photocatalytic reactions.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2016.10.063