Effect of Support on the Photocatalytic Degradation of Textile Effluents Using Nb2O5 and ZnO: Photocatalytic Degradation of Textile Dye

Brites, F. F.; Santana, Veronice Slusarski; Fernandes-Machado, Nádia Regina Camargo

doi:10.1007/s11244-011-9657-2

Cited by 44 publications

(24 citation statements)

References 16 publications

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“…The kinetic behavior exhibited in Figure 5 can be rationalized by the Langmuir-Hinshelwood (L-H) mechanism. The L-H model is applied to photocatalyzed heterogeneous systems once evolves an adsorption pre-equilibrium followed by a relatively slow reaction toward the products, which is represented by Equation 4 (Konstantinou & Albanis, 2004;Brites et al, 2011):…”

Section: Photocatalytic Degradation Of Vinassementioning

confidence: 99%

“…However, these treatments are not satisfactory because of low efficiency or difficult application in industrial scale with large vinasse volumes. The development of new vinasse treatment methods became necessary and the heterogeneous photocatalysis, an advanced oxidation process (AOP), is an interesting option (Santana & Fernandes-Machado, 2008;Brites, Santana, & Fernandes-Machado, 2011). Light and TiO 2 catalyst have been used as a redox system capable of mineralizing organic pollutants (Robert & Malato, 2002) in wastewater from several types of industries: textile dyes (Garcia, Simionato, Silva, Nozaki, & Souza, 2009), petrol station wastewater (Ferrari-Lima, Marques, Fernandes-Machado, & Gimenes, 2013) and pesticide (Ahmed, Rasul, Brown, & Hashib, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Photodegradation of sugarcane vinasse: evaluation of the effect of vinasse pre-treatment and the crystalline phase of TiO2

Souza¹,

Lima

Pezoti

et al. 2016

Acta Sci. Technol.

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ABSTRACT. In this work, the effect of vinasse pre-treatment and anatase content in the photocatalytic degradation of sugarcane vinasse was evaluated. The in nature vinasse was pretreated by coagulation/flocculation using vegetal tannin as coagulant and diluted 1: 2 with deionized water. The photocatalytic tests with in nature, pretreated and diluted vinasse were performed for 48 hours under UV radiation using 1 g of catalyst: TiO 2 Kronos calcined at 300 o C (100% anatase) and 1000 o C (34% anatase) and TiO 2 P25 (87% anatase). The process of coagulation/flocculation removed about 50, 85 and 97% of COD, color and turbidity of in nature vinasse, respectively. The results showed that despite the slight COD decrease of in nature vinasse, its toxicity was significantly reduced after photocatalytic treatment, especially when TiO 2 -34 and TiO 2 -87 were used. This behavior shows that the mixture of anatase and rutile phases showed a positive synergistic effect. Regarding pre-treatment of vinasse, the coagulation/flocculation process was more efficient, promoting the greatest reductions of COD (67%) and toxicity (up to 10 times).Keywords: vinasse, coagulation/flocculation, photocatalysis, toxicity.Fotodegradação da vinhaça: avaliação do efeito do pré-tratamento da vinhaça e da fase cristalina do TiO 2 RESUMO. Neste trabalho, foi avaliado o efeito do pré-tratamento da vinhaça e do teor de anatase na degradação fotocatalítica da vinhaça. A vinhaça in natura foi pré-tratada por coagulação/floculação usando tanino vegetal como coagulante e diluição 1:2 com água deionizada. Os testes fotocatalíticos com a vinhaça in natura, pré-tratada e diluída foram realizados durante 48h sob radiação UV utilizando 1 g de catalisador: TiO 2 Kronos calcinado a 300 o C (100% anatase) e a 1000 o C (34% anatase) e TiO 2 P25 (87% anatase). O processo de coagulação/floculação removeu cerca de 50, 85 e 97% de DQO, cor e turbidez da vinhaça in natura, respectivamente. Os resultados mostraram que apesar da pequena redução de DQO da vinhaça in natura, sua toxicidade foi reduzida significativamente após tratamento fotocatalítico, principalmente quando TiO 2 -34 e TiO 2 -87 foram utilizados. Esse comportamento evidencia que a mistura das fases anatase e rutile apresentou efeito sinérgico positivo. Em relação ao pré-tratamento da vinhaça, o processo de coagulação/floculação se mostrou mais eficiente, promovendo as maiores reduções de DQO (67%) e toxicidade (até 10 vezes).Palavras-chave: vinhaça, coagulação/floculação, fotocatálise, toxicidade.

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Section: Photocatalytic Degradation Of Vinassementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photodegradation of sugarcane vinasse: evaluation of the effect of vinasse pre-treatment and the crystalline phase of TiO2

Souza¹,

Lima

Pezoti

et al. 2016

Acta Sci. Technol.

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“…Os catalisadores suportados (5%Nb2O5/NaX, 10%Nb2O5/NaX e 10%Nb2O5/NaA) foram preparados pelo método de impregnação úmida (Schmal, 2011) Quando a concentração do corante for baixa (< 50 mg.L -1 ), a reação pode ser considerada de pseudo-primeira ordem (BRITES et al, 2011), pois o valor de K.C do denominador da equação 2 será muito pequeno, então esta equação pode ser simplificada, conforme a equação 3:…”

Section: Preparação E Caracterização Dos Catalisadoresunclassified

DEGRADAÇÃO DO EFLUENTE DO TINGIMENTO DE PELES DE PEIXE NA PRESENÇA DE Fe+2 EM SOLUÇÃO E Nb2O5 SUPORTADO EM ZEÓLITAS NaA E NaX (DEGRADATION OF THE FISH SKINS DYEING WASTEWATER IN THE PRESENCE OF Fe+2 IN SOLUTION AND Nb2O5 SUPPORTED ON NaA AND NaX ZEOLITES)

et al. 2017

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Resumo: A necessidade de se dar um destino adequado às peles, subproduto do processo de filetagem, motivou o desenvolvimento do processo de curtimento de peles de peixe. Este processo consome grande quantidade de água e consequentemente, gera volumes elevados de efluentes líquidos, os quais devem ser tratados adequadamente. Desta forma, o objetivo deste trabalho foi avaliar o efeito da presença de Fe +2 em solução na degradação do efluente da etapa de tingimento de peles de peixe por fotocatálise usando Nb2O5 suportado em zeólitas NaX e NaA. Catalisadores suportados com 5 e 10% (% mássica) de Nb2O5 foram preparados pelo método da impregnação úmida e caracterizados por análise textural, DRX e espectroscopia fotoacústica. Os testes consistiram em irradiar 300 mL do efluente com ou sem 1 g L -1 do catalisador durante 3, 6 e 10 h na presença de 40 mg de Fe +2 em solução. Os resultados mostraram redução na turbidez do efluente e aumento significativo na

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“…Water contamination generated by dyes originating from the textile industries is a growing problem [1][2][3][4] since these pollutants typically show color and toxicity even in low concentration [5][6] . Several processes have been used to promote the water decontamination, among them physical and chemical processes.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Photocatalytic Potential of TiO2 and ZnO Obtained by Different Wet Chemical Methods

et al. 2017

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This paper describes the development of TiO 2 and ZnO particles by a chemical route, using two different wet synthesis methods: polymeric precursor (PP) and sol-gel (SG). This study aimed to shed a light on how the synthesis method affects the photocatalytic activity of these oxides. Rhodamine B (RhB) degradation was used as a probe reaction to test the as-synthesized TiO 2 and ZnO photoactivity. It was observed that surface availability, which is related to the presence of synthesis residue, is the key parameter to determine photoactivity. ZnO PP and ZnO SG presented degradation of 88% to RhB. Both samples presented synthesis residue on the surface. On the other hand, TiO 2 PP presented a better performance than TiO 2 SG, once 90% of RhB was degraded, while TiO 2 SG degraded 80% of the dye. In this case, TiO 2 PP was free of synthesis residue on the surface, while TiO 2 SG presented residues.

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Effect of Support on the Photocatalytic Degradation of Textile Effluents Using Nb2O5 and ZnO: Photocatalytic Degradation of Textile Dye

Cited by 44 publications

References 16 publications

<b>Photodegradation of sugarcane vinasse: evaluation of the effect of vinasse pre-treatment and the crystalline phase of TiO<sub>2</sub>

<b>Photodegradation of sugarcane vinasse: evaluation of the effect of vinasse pre-treatment and the crystalline phase of TiO<sub>2</sub>

DEGRADAÇÃO DO EFLUENTE DO TINGIMENTO DE PELES DE PEIXE NA PRESENÇA DE Fe+2 EM SOLUÇÃO E Nb2O5 SUPORTADO EM ZEÓLITAS NaA E NaX (DEGRADATION OF THE FISH SKINS DYEING WASTEWATER IN THE PRESENCE OF Fe+2 IN SOLUTION AND Nb2O5 SUPPORTED ON NaA AND NaX ZEOLITES)

Evaluation of the Photocatalytic Potential of TiO2 and ZnO Obtained by Different Wet Chemical Methods

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