Photodegradation of orange G by the hetero-junction x%Bi2S3/TiO2 under solar light

Boumaza, S.; Bellal, B.; Boudjemaa, Amel; Trari, M.

doi:10.1016/j.solener.2016.10.009

Cited by 31 publications

(13 citation statements)

References 25 publications

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“…These flaws impede its practical applications. Hence, different approaches have been explored to improve its photocatalytic activities, including metal/nonmetal doping [11, 12], dye sensitization [13], and heterojunction formation [14, 15]. …”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Properties of Co3O4-Coated TiO2 Powders Prepared by Plasma-Enhanced Atomic Layer Deposition

et al. 2017

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Co3O4-coated commercial TiO2 powders (P25) p-n junction photocatalysts were prepared by plasma-enhanced atomic layer deposition (PEALD) technique. The structure, morphology, bandgap, and photocatalytic properties under ultraviolet light were investigated systematically. Although the deposition of Co3O4 does not change the anatase structure and crystallite size of P25 powders, the ultraviolet photocatalytic activity has been improved evidently. For the Co3O4-coated P25 powders, the trace Co ions exist as Co3O4 nanoparticles attached to TiO2 powder surface instead of the occupation of Ti4+ position in TiO2 lattice. The Co3O4-coated P25 powders exhibit enhanced photocatalytic degradation efficiency of almost 100% for methylene blue in 1.5 h under ultraviolet light, compared with P25 of 80%. The Mott-Schottky plots of photocatalyst powders confirm the p-n heterojunction formation in Co3O4–TiO2 nanocomposite materials, which is beneficial to increase the efficiency of photogenerated electron-hole separation. In addition, the Co3O4 coating also promotes the adsorption of organic dyes of methylene blue on P25 powders.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic Properties of Co3O4-Coated TiO2 Powders Prepared by Plasma-Enhanced Atomic Layer Deposition

et al. 2017

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“…We observe that the absorbance in the above range decreases significantly up to 60 min and afterwards the decrease is slowing down and absorbance remains almost constant for the period of 120-180 min. rings of OG, respectively [35,36]. It should be noted that ascorbic acid absorption peak (265 nm) interferes with the benzene ring peak of azo dye located at 250 nm.…”

Section: Decolorization By Adsorptionmentioning

confidence: 97%

“…The electronic spectra of OG, OG-AA, and AA aqueous solutions are seen in Figure 1. The peaks at 475 and 410 nm, responsible for the color, are attributed respectively to the azo-bonds of hydrozon and azo form and the peaks at 250 and 330 nm are assigned to benzene and naphthalene rings of OG, respectively [35,36]. It should be noted that ascorbic acid absorption peak (265 nm) interferes with the benzene ring peak of azo dye located at 250 nm.…”

Section: Decolorization By Adsorptionmentioning

confidence: 98%

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Decolorization of Orange-G Aqueous Solutions over C60/MCM-41 Photocatalysts

et al. 2019

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The majority of the photocatalysts studied for azo-dye degradation are based on semiconductor materials. Studies reported on non-semiconducting materials are very scarce. In the present work, we studied the fullerene (C60) ability to accelerate photodegradation of the dye’s azo bond in the presence of ascorbic acid. A series of C60 supported on ordered mesoporous silica (MCM-41) catalysts, containing 1, 3, 6, 9, and 12 wt % of fullerene C60, was studied using Orange G (OG) as representative azo-dye. This study showed that partial decolorization is achieved in the dark by simple adsorption of the dye on the bare surface of the carrier. The extent of decolorization increases with the irradiation of the suspension due to photocatalytic degradation of the azo-bond. This is maximized over the sample containing 3 wt % of C60 and it has been attributed to the best combination of the extent of the dye adsorption with the high intrinsic photocatalytic activity of small C60 clusters predominated in this sample. This catalyst proved to be quite stable upon five subsequent photocatalytic cycles, losing less than 5% of its initial activity. No degradation of OG takes place in the absence of ascorbic acid.

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“…Dos corantes disponíveis no mercado, aproximadamente 50 a 70% são corantes azo, assim denominados pela presença do grupo funcional (-N=N-) (Madhavan et al, 2010). O Alaranjado G (AG) é um típico corante azo utilizado pela indústria têxtil, cuja degradação por métodos biológicos é frequentemente ineficiente (Boumaza et al, 2016), além de serem de difícil remoção por técnicas convencionais como coagulação, separação por membrana e adsorção (Roumila et al, 2016).…”

Section: Introductionunclassified

FOTOCATÁLISE SOLAR COM TiO2 PARA DEGRADAÇÃO DO CORANTE ALARANJADO G

Oliveira¹,

Andersen²

2018

Blucher Chemical Engineering Proceedings

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RESUMO -Os corantes estão entre os principais resíduos tóxicos gerados pelos processos industriais. A oxidação fotocatalítica se apresenta promissora na degradação desses contaminantes e pode utilizar a luz solar como a fonte de energia. O Alaranjado G (AG) é um corante azo utilizado pela indústria têxtil, cuja degradação por métodos convencionais, como coagulação, separação por membrana e adsorção, é frequentemente ineficiente. O objetivo deste trabalho foi avaliar a degradação do corante AG, utilizando o TiO₂ e a luz solar. Foram avaliados o efeito da concentração de corante, de concentração de catalisador e pH. O estudo revelou que a fotocatálise apresenta alta eficiência em ampla faixa de pH; assim como em concentrações de corante de até 50 mg.L⁻¹; e para concentrações de TiO₂ menores que 0,5 g.L⁻¹.

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Photodegradation of orange G by the hetero-junction x%Bi2S3/TiO2 under solar light

Cited by 31 publications

References 25 publications

Photocatalytic Properties of Co3O4-Coated TiO2 Powders Prepared by Plasma-Enhanced Atomic Layer Deposition

Photocatalytic Properties of Co3O4-Coated TiO2 Powders Prepared by Plasma-Enhanced Atomic Layer Deposition

Decolorization of Orange-G Aqueous Solutions over C60/MCM-41 Photocatalysts

FOTOCATÁLISE SOLAR COM TiO2 PARA DEGRADAÇÃO DO CORANTE ALARANJADO G

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