Using rice husk ash as a SiO 2 source in the preparation of SiO 2 /Nb 2 O 5 and SiO 2 /ZnS heterostructures for photocatalytic application.

Autor: Ücker CL; Graduate Program in Science and Materials Engineering, Technological Development Center, Federal University of Pelotas, Gomes Carneiro 1, Pelotas, RS, 96010-610, Brazil. catiaucker@gmail.com., Almeida SR; Graduate Program in Science and Materials Engineering, Technological Development Center, Federal University of Pelotas, Gomes Carneiro 1, Pelotas, RS, 96010-610, Brazil., Maron GK; Graduate Program in Science and Materials Engineering, Technological Development Center, Federal University of Pelotas, Gomes Carneiro 1, Pelotas, RS, 96010-610, Brazil., Carreno NLV; Graduate Program in Science and Materials Engineering, Technological Development Center, Federal University of Pelotas, Gomes Carneiro 1, Pelotas, RS, 96010-610, Brazil., Morisso FDP; Postgraduate in Materials Technology and Industrial Processes, Universidade Feevale, Novo Hamburgo, RS, 93525-075, Brazil., da Silva Cava S; Graduate Program in Science and Materials Engineering, Technological Development Center, Federal University of Pelotas, Gomes Carneiro 1, Pelotas, RS, 96010-610, Brazil., Raubach CW; Graduate Program in Science and Materials Engineering, Technological Development Center, Federal University of Pelotas, Gomes Carneiro 1, Pelotas, RS, 96010-610, Brazil.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2023 Jun; Vol. 30 (26), pp. 68477-68488. Date of Electronic Publication: 2023 May 01.
DOI: 10.1007/s11356-023-27240-6
Abstrakt: This work presents the synthesis of SiO 2 /Nb 2 O 5 and SiO 2 /ZnS heterostructures using the microwave-assisted hydrothermal (MAH) method, which is fast and has low temperature. The silica used in the synthesis was obtained by burning the rice husk without any pre- or post-treatments. The obtained samples were characterized using various techniques such as X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), and UV-visible. The obtained silica was found to be amorphous, and the materials used for modification showed characteristic of the type of synthesis used. SEM images showed that Nb 2 O 5 and ZnS interacted with the SiO 2 surface, filling the voids. In the photocatalytic process, the heterostructures showed enhanced decolorization efficiency for dyes such as rhodamine B (RhB) and methylene blue (MB) compared to SiO 2 . For RhB, the silica decolorized approximately 24%, and for MB, it discolored approximately 27%; SiO 2 /Nb 2 O 5 showed 91.24% decolorization efficiency for RhB and 72.77% MB, while SiO 2 /ZnS showed approximately 96% for RhB and 100% for MB. All samples were tested under the same conditions. This demonstrates that the use of rice husk residue not only improves the photocatalytic activity of heterostructures but also promotes the utilization of improperly discarded residues.
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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