Degradation of azo-reactive dyes by ultraviolet radiation in the presence of hydrogen peroxide

Georgiou, D.; Melidis, Paraschos; Aivasidis, A.; Gimouhopoulos, K.

doi:10.1016/s0143-7208(01)00078-x

Cited by 301 publications

(162 citation statements)

References 9 publications

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“…These dye effluents are often rich in colour, containing reactive dyes and chemicals and create several environmental problems by discharging into the aqueous phase. Various physical and chemical processes such as reverse osmosis, adsorption, precipitation, ultrafiltration, flocculation and air stripping can be used for removal of colour from dye effluents (Georgiou, Melidis, Aivasidis, & Gimouhopoulos, 2002;Ledakowicz, Solecka, & Zylla, 2001;Peralta-Zamora et al, 1999;Robinson, McMullan, Marchant, & Nigam, 2001). These techniques, however, are non-destructive because they only transfer pollutants into sludge, which needs further treatment (Arslan, Balcioglu, Tuhkanen, & Bahnemann, 2000;Chaudhuri & Sur, 2000;Stock, Peller, Vinodgopal, & Kamat, 2000).…”

Section: Introductionmentioning

confidence: 99%

Photodegradation Study of Toluidine Blue Dye in Aqueous Solution using Magnesium Oxide as a Photocatalyst

Salim¹,

Salih²

2015

IJC

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The photocatalytic degradation of Toluidine Blue dye (TB) in aqueous solution was investigated under UV light in the presence of magnesium oxide (MgO) as a photocatalyst at different operating parameters. The operating conditions were photocatalyst dose, initial dye concentration and the pH of the solution. Increasing of photocatalyst dose from 10 to 70 mg enhanced the degradation rate of TB dye. However, the increasing of TB dye concentration from 2 to 8 mg/L negatively affected the degradation rate. It was found that the percent of dye removal reached the maximum value at high acidic medium. In dark condition, 15 % of dye was adsorbed by MgO. Furthermore, the kinetics involved in the degradation of TB dye was examined and the degradation was found to follow pseudo first order kinetic model.

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Section: Introductionmentioning

confidence: 99%

Photodegradation Study of Toluidine Blue Dye in Aqueous Solution using Magnesium Oxide as a Photocatalyst

Salim¹,

Salih²

2015

IJC

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“…The possible reactions, which occur during UV/H 2 O 2 process, are hydrogen abstraction, electrophilic addition and electron transfer reaction and the final products are H 2 O, CO 2 and low molecular weight aliphatic acids and resultantly improve the water quality parameter [11][12][13][14][15][16][17]. The UV irradiation in the presence of hydrogen peroxide (H 2 O 2 ) is a very promising AOP technique (200-280 nm) which leads to disassociation of H 2 O 2 and resultantly system generates hydroxyl radicals ( • OH), highly powerful oxidizing species, produce organic radicals (R • ) and resultantly chain reaction is stared [8,10,[18][19]. Regarding the importance of AOPs, UV/H 2 O 2 system was used for degradation of methyl blue and optimized the variable (dye concentration and H 2 O 2 percentage) for maximum dye removal.…”

Section: Introductionmentioning

confidence: 99%

Photo-degradation of the methyl blue: Optimization through response surface methodology using rotatable center composite design

Iqbal

Bhatti²,

Ahmad³

2013

International Journal of Basic and Applied Sciences

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Advanced oxidation processes (AOPs) generate in situ active hydroxyl radicals which allowed the destruction of polluting agents through mineralization. The suitable experimental design allows adjustment of factor levels to obtain an optimal response in experimental analysis. Rotatable Center Composite design and multivariate analysis were used for the optimization of the removal of methyl blue from aqueous solution, using UV (254 nm) radiation source and hydrogen peroxide as an oxidant. A factorial design (2 n ) with repeated central and axial points was used to obtain the best experimental condition to efficiently remove the dye from aqueous solution and initial dye concentration, 50-150 ppm and hydrogen peroxide 0.05-5.95 % was used as experimental variables. At optimum level up to 96.5% dye removal was recorded. Dye degradation followed the first order kinetics and dissolved oxygen and pH of the dye aqueous solution were found strongly correlated with the dye degradation.

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“…Desta forma, o maior problema destes efluentes está relacionado ao parâmetro cor, pois grandes quantidades de corantes usados nas indústrias têxteis são perdidos durante o processo de tingimento (GEORGIOU et al, 2002;SIQUEIRA et al, 2002;GUARATINI;ZANONI, 2000). A presença de corantes nos efluentes é altamente visível, afeta a estética, a transparência da água e a solubilidade de gases nos corpos receptores, e reduz a capacidade de aeração dos corpos hídricos em função da redução da penetração de luz solar e conseqüente alteração dos processos de fotossíntese (GUARATINI; ZANONI, 2000).…”

Section: Introductionunclassified

Determinação e análise de isotermas de adsorção do corante azul 5G em leito fixo de carvão ativado

2011

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RESUMO. Visando o desenvolvimento de um processo de tratamento de efluentes têxteis, este trabalho teve por objetivo estudar o processo de adsorção do corante reativo azul 5G de um efluente sintético em carvão ativado. As isotermas de adsorção, com seus respectivos parâmetros ajustados, em sistema batelada foram obtidas para as temperaturas de 30, 40 e 60 ο C (com pH controlado na faixa de 6,0 a 8,0 e também com tempo de contato entre o sistema corante-carvão de 90 horas) segundo os modelos de Langmuir e Freundlich. A partir daí estes parâmetros foram colocados em função da temperatura, apresentando bons resultados frente aos dados experimentais.Palavras-chave: adsorção, modelagem matemática, corante reativo azul 5G.ABSTRACT. Mathematical model of the adsorption column, in activate Carbon, used in the renovation of blue-colorant 5G. This work, to looking for the development of process for wastes textile treatment, had the objective to study the adsorption process of the blue reactive dyes 5G from the synthetic effluent in coal activated. The isotherms of adsorption in batch system was made for temperatures of 30, 40 and 60 ο C (the pH was controlled in 6.0 until 8.0 and the time of contact between the system dye-coal was 90 hours) with posterior adjustment of the models for Langmuir and Freundlich equations. After, these parameters were put in function of temperature, with good results when compared to the experimental data.

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Degradation of azo-reactive dyes by ultraviolet radiation in the presence of hydrogen peroxide

Cited by 301 publications

References 9 publications

Photodegradation Study of Toluidine Blue Dye in Aqueous Solution using Magnesium Oxide as a Photocatalyst

Photodegradation Study of Toluidine Blue Dye in Aqueous Solution using Magnesium Oxide as a Photocatalyst

Photo-degradation of the methyl blue: Optimization through response surface methodology using rotatable center composite design

Determinação e análise de isotermas de adsorção do corante azul 5G em leito fixo de carvão ativado

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