Optical band gap and photoluminescence studies of Eu3+-doped zinc silicate derived from waste rice husks

Khaidir, Rahayu Emilia Mohamed; Fen, Yap Wing; Zaid, Mohd Hafiz Mohd; Omar, Nur Alia Sheh; Anuar, Muhammad Fahmi; Wahab, Siti Aisyah Abdul; Azman, Aisyah Zakiah Khirel

doi:10.1016/j.ijleo.2019.01.061

Cited by 40 publications

(24 citation statements)

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“…In order to determine the size of the crystal, the type of crystal, and the surface morphology of the zinc silicate glass and glass-ceramics samples, the FESEM analysis was done. From our observations, at the lower temperatures of 27 • C and 700 • C there were no grain growth, showing a clear glassy surface that tallies with the XRD result where at 27 • C and 700 • C the sample was still in an amorphous phase [16]. Meanwhile, as the sintering temperature increased to 750 • C and 800 • C, the microstructure of the sample still did not show a regular shape (irregular) and started to aggregate among each other.…”

Section: Discussionsupporting

confidence: 86%

A Study on Optical Properties of Zinc Silicate Glass-Ceramics as a Host for Green Phosphor

et al. 2020

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For the very first time, a study on the crystallization growth of zinc silicate glass and glass-ceramics was done, in which white rice husk ash (WRHA) was used as the silicon source. In this study, zinc silicate glass was fabricated by using melt–quenching methods based on the composition (ZnO)0.55(WRHA)0.45, where zinc oxide (ZnO) and white rice husk ash were used as the raw materials. The control crystallization technique was used in which the sample was sintered at 700–950 °C; then, the physical, structural, and optical properties of the glass and glass-ceramics were investigated by using a densitometer, linear shrinkage, X-ray diffraction (XRD), Fourier transform infrared radiation (FTIR), field-emission scanning electron microscopy (FESEM), and photoluminescence spectroscopy (PL). The density and linear shrinkage increased as the crystallinity increased and the XRD results showed the progression of the crystal formation, in which the sample was still in an amorphous state at 27 °C and 700 °C; the crystalline phase started at 750 °C. Based on the FTIR spectra, all samples showed sharpened absorption bands as the sintering temperature was increased, and the FESEM image showed the progression of crystal growth, indicating the formation of zinc silicate glass-ceramics. Lastly, the PL spectra emitted three emission peaks, at 529, 570, and 682 nm for the green, yellow, and red emission, respectively.

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Section: Discussionsupporting

confidence: 86%

A Study on Optical Properties of Zinc Silicate Glass-Ceramics as a Host for Green Phosphor

et al. 2020

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“…Por lo tanto, la E opt del sistema disminuye de 4,50 a 4,41 eV en orden creciente de ZnO y la disminución es causada por la naturaleza covalente del enlace Zn-O. Khaidir et al (2019) investigaron la fotoluminiscencia y propiedades ópticas de vidrios y vitrocerámicas de silicato de zinc dopado con europio (Zn2SiO 4:Eu 3+) derivado de cenizas de cáscara de arroz blanco como fuente potencial de sílice mediante el método de sinterización. El análisis difracción de rayos X (XRD) reveló la formación de fases amorfas, a o ß-Zn2SiO4: Eu3+ en las muestras de vidrio y vitrocerámica.…”

Section: Producción De Vitrocerámicas Basadas En Cenizasunclassified

Materiales vitrocerámicos obtenidos a partir de residuos sólidos tales como cenizas, escorias y vidrio: revisión

Montoya-Quesada

Villaquirán-Caicedo

Gutiérrez

2020

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Glass-ceramic obtained from solid waste such as ash, slag, and glass waste: review Resumen El uso de residuos y subproductos industriales como reemplazo parcial o total de materias primas vírgenes para la producción de nuevos materiales, se ha convertido en una parte vital de la gestión de desechos, lo cual ha dado lugar a tecnologías innovadoras que permiten extender su aplicación al desarrollo de nuevos productos, contribuyendo así a la menor contaminación ambiental y a los conceptos de la economía circular. En los últimos años, la tecnología de vitrificación de residuos se ha considerado un procedimiento atractivo para el tratamiento de diferentes tipos y mezclas de residuos para la obtención de vidrios y vitrocerámicas. El presente artículo realizó una revisión de investigaciones relacionadas con la producción de vitrocerámicas densas realizadas entre 1994 y 2019, específicamente las que han utilizado cenizas, escorias y residuos de vidrio. La revisión revela que se han acumulado considerables conocimientos y experiencia en el proceso de transformación de los desechos base silicatos, en productos útiles de vidrio y vitrocerámicas con propiedades similares o incluso superiores a los obtenidos a partir de materias primas no renovables, abriendo nuevos campos de aplicación en cerámicas avanzadas.

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“…Several past studies have proven that silica can be extracted from various agricultural wastes, such as rice husk, rice straw, sugarcane bagasse, corn cob and palm ash [8,[11][12][13][15][16][17][21][22][23][24][25][26][27][28]. However, information regarding its synthesis from coconut husk waste is limited.…”

Section: Introductionmentioning

confidence: 99%

The Physical and Optical Studies of Crystalline Silica Derived from the Green Synthesis of Coconut Husk Ash

et al. 2020

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The green synthesis of silica has been extensively explored over the last few decades, as silica compounds found in commercial products can cause negative effects on human health. This calls for alternative ways to produce silica that are safer, cheaper and more environmentally friendly. Some of the agricultural wastes proven to contain silica include rice husk, sugarcane bagasse, coconut shells and coconut husk. This paper describes the synthesis of silica from coconut husk waste, and its physical and optical properties for potential utilization in optical applications. Coconut husk was subjected to fire at 500–700 °C so as to form coconut husk ash (CHA), and was then treated with sulfuric acid to extract silica from the ash. Most of the weight degradation subsequently occurred at temperatures from 221 to 360 °C. X-ray fluorescence (XRF) analysis proved that 91.76% of the silica was obtained, while major peaks on the X-ray diffraction (XRD) spectrum were observed after the acid treatment. Chemical bonds such as Si-O-Si, CH2, -OH and Si-OH were found in the spectrum of the Fourier transform infrared spectroscopy (FTIR). Furthermore, the particles displayed rod-like shapes and irregular sizes, but the particle with sizes ranging from 200–750 nm decreased after the acid treatment. The relationship between the absorption coefficient and photon energy was obtained by finding the optical energy gap, which was found to be 4.3 eV. These data points provide critical information when used in optical applications. The overall studies show that synthesized silica has great potential for use in optical field applications.

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Optical band gap and photoluminescence studies of Eu3+-doped zinc silicate derived from waste rice husks

Cited by 40 publications

References 41 publications

A Study on Optical Properties of Zinc Silicate Glass-Ceramics as a Host for Green Phosphor

A Study on Optical Properties of Zinc Silicate Glass-Ceramics as a Host for Green Phosphor

Materiales vitrocerámicos obtenidos a partir de residuos sólidos tales como cenizas, escorias y vidrio: revisión

The Physical and Optical Studies of Crystalline Silica Derived from the Green Synthesis of Coconut Husk Ash

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