Photocatalytic degradation of azo dye acid red 14 in water: investigation of the effect of operational parameters

Daneshvar, N.; Salari, Dariush; Khataee, Alireza

doi:10.1016/s1010-6030(03)00015-7

Cited by 858 publications

(399 citation statements)

References 23 publications

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“…Textile and dye-manufacturing industries are discharging toxic and non-biodegradable azo dyes, such as methyl orange, into the environment (Daneshvar et al 2003). Of the total world production of dyes, up to 20% is lost during industrial processing, causing environmental pollution and contributing to eutrophication that affects aquatic life (Konstantinou and Albanis 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Current methods used to treat these effluents are mainly physicochemical, causing a disposal issue for the sludge residue. For example, chemical precipitation and separation of pollutants, electrocoagulation and elimination by adsorption do not destroy the contaminants: they only transfer them to solids which are primarily disposed of into landfills (Daneshvar et al 2003).…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of methyl orange dye by pristine titanium dioxide, zinc oxide, and graphene oxide nanostructures and their composites under visible light irradiation

2017

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Discharge of azo dyes by textile and allied industries to the environment is a growing problem. Degradation of an azo dye, methyl orange (MO), was tested in simulated wastewater with different oxide nanomaterials acting as photocatalysts under visible light. Titanium dioxide (TiO 2 ), zinc oxide (ZnO), and graphene oxide (GO) were synthesized, characterized, and applied for adsorptive and photocatalytic removal of the dye. Factors such as initial concentration of MO and size of nanoparticle photocatalyst were varied to determine the optimum conditions for dye removal. Finally, nanocomposites of the three materials (GO-TiO 2 -ZnO) were synthesized and tested for its photocatalytic performance. The composition of the individual oxide in the nanocomposite was then varied to achieve the best photocatalytic performance.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of methyl orange dye by pristine titanium dioxide, zinc oxide, and graphene oxide nanostructures and their composites under visible light irradiation

2017

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“…At higher dye concentrations, larger amounts of the dye absorbed onto catalyst are thought to inhibit the reaction between dye molecules and oxidative species to some extent because less oxidative species are produced [15]. The other possible reason is that a large amount of UV may be absorbed by the dye molecules rather than TiO 2 particles, which reduce the photocatalytic efficiency [16].…”

Section: Influence Of Initial Concentration Of X-3bmentioning

confidence: 99%

Microwave assisted photocatalytic degradation of high concentration azo dye Reactive Brilliant Red X-3B with microwave electrodeless lamp as light source

Zhang

Wang

2007

Dyes and Pigments

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“…Isto indica que o TiO 2 ao ser iluminado com radiação < 380 nm forma o par elétron-buraco, gerando a partir de H 2 O e/ou HO -, previamente adsorvidos na superfície do fotocatalisador o radical hidroxila, que oxida o corante próximo à superfície de TiO 2 , de acordo com as reações 1-3 5,13,14 . HO• ads + corante →→→ produto oxidado 1…”

Section: Degradação Da Amostra Irradiadaunclassified

Efeitos dos parâmetros operacionais na fotodegradação do azo corante direct red 23 na interface dióxido de titânio/água

Clausen¹,

Takashima²

2007

Quím. Nova

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Recebido em 13/11/06; aceito em 27/4/07; publicado na web em 16/10/07 EFFECTS OF OPERATIONAL PARAMETERS ON THE PHOTODEGRADATION OF DIRECT RED 23 AZO DYE AT THE TITANIUM DIOXIDE / WATER INTERFACE. The decolorization and degradation of direct red 23 azo dye have been investigated in aqueous suspension of titanium dioxide under artificial irradiation. The effects of some operational parameters such as azo dye concentration, catalyst loading, and solution pH were investigated at 30.0 °C and optimized values were obtained. The first-order kinetic model was used to discuss the results. The UV-Vis spectra changes showed that the azo dye sample, collected after 6 h irradiation, was 98% decolorized while the residual total carbon was 97.9% degraded, indicating simultaneous photodecolorization and degradation.Keywords: photocatalysis; diazo dye; titanium dioxide. INTRODUÇÃOA contaminação de águas naturais tem sido apontada como um dos maiores problemas da sociedade moderna. Dentro deste contexto, o setor têxtil apresenta especial destaque por utilizar grandes quantidades de água e por gerar grandes volumes de efluentes, os quais apresentam composição extremamente heterogênea 1 . Estes efluentes apresentam coloração intensa porque aproximadamente 20% da produção total de corantes são perdidos para o meio ambiente durante a etapa de tingimento das fibras 2 . Considerandose ainda que mais de 50% da produção mundial de corantes orgâni-cos sejam provenientes das indústrias têxteis, significa que se o tratamento não for adequado pode alterar o ecossistema, diminuindo a transparência da água e a penetração da radiação solar e, conseqüentemente, a atividade fotossintética e a solubilidade dos gases. Além disso, admite-se que o maior problema ambiental seja gerado pela utilização ampla de azo corante, de reconhecido efeito carcinogênico e mutagênico, já que representa cerca de 60% dos corantes consumidos atualmente no mundo 3 . O tratamento de efluentes têxteis tem sido realizado através da combinação de processos convencionais físicos, químicos e bioló-gicos, em virtude das características complexas e bio-resistentes 4 . No entanto, estes processos não são destrutivos, pois simplesmente transferem o composto orgânico do meio aquoso para outro meio causando poluição secundária. Devido às limitações dos processos convencionais para descoloração de efluentes têxteis, têm se buscado as tecnologias efetivas e economicamente viáveis para resolução desse impasse ambiental. Uma alternativa para reduzir os subprodutos e a cor desses efluentes são os Processos de Oxidação Avançados (POAs) que geralmente utilizam agentes oxidantes fortes e/ou catalisadores, como TiO 2 , na presença ou não de radiação para gerar radical hidroxila HO•. Este radical por ser altamente reativo é capaz de mineralizar as substâncias orgânicas presentes nos efluentes industriais 5 . Dentre os processos que produzem radical hidroxila, a fotocatálise heterogênea tem se mostrado no decorrer das duas úl-timas décadas como um dos métodos mais promissores na destruição d...

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Photocatalytic degradation of azo dye acid red 14 in water: investigation of the effect of operational parameters

Cited by 858 publications

References 23 publications

Photocatalytic degradation of methyl orange dye by pristine titanium dioxide, zinc oxide, and graphene oxide nanostructures and their composites under visible light irradiation

Photocatalytic degradation of methyl orange dye by pristine titanium dioxide, zinc oxide, and graphene oxide nanostructures and their composites under visible light irradiation

Microwave assisted photocatalytic degradation of high concentration azo dye Reactive Brilliant Red X-3B with microwave electrodeless lamp as light source

Efeitos dos parâmetros operacionais na fotodegradação do azo corante direct red 23 na interface dióxido de titânio/água

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