Hydrogen peroxide-assisted photocatalytic degradation of textile wastewater using titanium dioxide and zinc oxide

Domingues, Fernando Santos; Freitas, Thábata Karoliny Formicoli de Souza; Almeida, Cibele Andrade de; Souza, Renata Padilha de; Ambrosio, Elizângela; Palácio, Soraya Moreno; Garcia, Jocilaine

doi:10.1080/09593330.2017.1418913

Cited by 26 publications

(13 citation statements)

References 43 publications

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“…Furthermore, it can also be added to the reaction medium during photocatalytic treatment to improve the efficiency of the process through the production of additional radical species. For example, Domingues et al [63] investigated the hydrogen peroxide-assisted photocatalytic degradation of a dyeing factory effluent using TiO 2 or ZnO as catalysts. The authors found that the addition of hydrogen peroxide at a concentration of 10 −2 M to the effluent significantly increased the removal of dyes without generating secondary pollutants.…”

Section: Effect Of Hydrogen Peroxidementioning

confidence: 99%

Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

et al. 2019

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The presence of azo dyes in textile effluents is an issue of major concern due to their potential impact on the environment and human health. In this study we investigate the photocatalytic degradation under visible light of Reactive Violet 5 (RV5), an azo dye widely used in the textile industry. A preliminary screening of different titania-based catalysts was carried out to identify the best candidate for RV5 removal. The selected catalyst was then tested in a stirred and aerated lab-scale reactor illuminated with a blue light-emitting diode (LED) source emitting in the wavelength range of 460-470 nm. The effects of pH, catalyst load, and hydrogen peroxide additions on the efficiency of dye removal were evaluated. Under the best conditions (pH 10, 3 g/L of catalyst, and 60 mM hydrogen peroxide), the dye solution was completely decolorized in about 2 h. Overall, the results obtained suggest that the proposed process may represent a suitable method for the removal of RV5 from textile effluents.Author Contributions: Methodology, A.Z., R.L., V.V., and G.I.; investigation, M.M.M.; writing-original draft preparation, A.Z. and G.I.; writing-review and editing, R.L. and V.V.

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Section: Effect Of Hydrogen Peroxidementioning

confidence: 99%

Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

et al. 2019

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“…Furthermore, ZnO Ps have been applied to textile fibers to improve flame retardancy and thermal stability and to achieve moisture management and thermal insulation, electrical conductivity, and hydrophobicity [5][6][7][8][9][10][11][12][13][14][15][16]. The photocatalytic properties also enable ZnO Ps to be used as degradation agents for different pollutants, such as dyes and surfactants present in textile industry wastewaters [12,[17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Zinc Oxide for Functional Textile Coatings: Recent Advances

2019

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The use of ZnO for the functionalization of textile substrates is growing rapidly, since it can provide unique multifunctional properties, such as photocatalytic self-cleaning, antimicrobial activity, UV protection, flame retardancy, thermal insulation and moisture management, hydrophobicity, and electrical conductivity. This paper aims to review the recent progress in the fabrication of ZnO-functionalized textiles, with an emphasis on understanding the specificity and mechanisms of ZnO action that impart individual properties to the textile fibers. The most common synthesis and application processes of ZnO to textile substrates are summarized. The influence of ZnO concentration, particle size and shape on ZnO functionality is presented. The importance of doping and coupling procedures to enhance ZnO performance is highlighted. The need to use binding and seeding agents to increase the durability of ZnO coatings is expressed. In addition to functional properties, the cytotoxicity of ZnO coatings is also discussed. Future directions in the use of ZnO for textile functionalization are identified as well.

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“…Em geral, percebeu-se que as características mais monitoradas para efluentes têxteis são DQO, DBO, pH, turbidez, cor aparente e sólidos totais (ST). A determinação de carbono orgânico total, análise essa dependente de um equipamento mais complexo em laboratórios, foi encontrada somente em sete dos 48 trabalhos consultados, 8,9,11,26,39,41,50 enquanto a DQO foi quantificada por praticamente todos, por ser uma análise de menor custo. Tanto os valores de DQO, quanto os de DBO são exigidos por órgãos ambientais.…”

Section: Características De Efluentes Têxteis Brasileirosunclassified

Critical Analysis of the Characteristics of Industrial Effluents from the Textile Sector in Brazil

Ramos¹,

Claudio²,

Rezende³

et al. 2020

Rev. Virtual Quim.

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High water consumption and the consequent generation of large volumes of effluent are two of the most damaging characteristics of textile industries in the socio-environmental context. Water is used in practically all stages of the beneficiation process, generating effluents of heterogeneous composition, containing complex and recalcitrant compounds. The present work had as objective to make a survey and analysis of the data of textile effluents from Brazil obtained through extensive consultation to the literature. It was noticed that the analyzed characteristics varied significantly between the effluents, highlighting the high concentration of organic matter, through the parameters Chemical and Biochemical Oxygen Demands (COD and BOD, respectively). Effluents from industries generally had a higher concentration of organic matter than those from industrial laundries. There is no linear correlation (R 2 < 0.8) between COD and BOD 5 data. The existence of such correlation would allow estimating BOD 5 through COD, as a way to expedite the characterization of wastewater. Through values above 3.5 for the COD/BOD 5 ratio, it was observed that most of these effluents have low biodegradability. Due to this aspect, the physical-chemical process of coagulation-flocculation has typically been the main stage involved in their treatments. However, biological processes have also been used to contribute to the removal of biodegradable organic matter. O alto consumo de água e a consequente geração de grandes volumes de efluente são duas das características mais prejudiciais das indústrias do setor têxtil no contexto socioambiental. A água é utilizada em praticamente todas as etapas do processo de beneficiamento, gerando efluentes de composição heterogênea, contendo compostos complexos e recalcitrantes. O presente trabalho teve como objetivo fazer um levantamento e análise dos dados de efluentes têxteis do Brasil obtidos por meio de extensa consulta à literatura. Percebeu-se que as características analisadas variaram significativamente entre os efluentes, destacando a alta concentração de matéria orgânica, por meio dos parâmetros Demandas Química e Bioquímica de Oxigênio (DQO e DBO, respectivamente). Efluentes de indústrias geralmente apresentaram maior concentração de matéria orgânica que aqueles provenientes de lavanderias industriais. Ao confrontar os dados de DQO e DBO 5 não foi constatada correlação linear entre eles (R 2 < 0,8). A existência de tal correlação permitiria estimar a DBO 5 em função da DQO, como forma de agilizar a caracterização de águas residuárias. Por meio de valores acima de 3,5 para a razão DQO/DBO 5 , observou-se que a maioria desses efluentes tem baixa biodegradabilidade. Devido a esse aspecto, o processo físico-químico de coagulação-floculação tem sido tipicamente a principal etapa envolvida em seus tratamentos. Contudo, processos biológicos têm sido também usados para contribuir com a remoção de matéria orgânica biodegradável.

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Hydrogen peroxide-assisted photocatalytic degradation of textile wastewater using titanium dioxide and zinc oxide

Cited by 26 publications

References 43 publications

Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

Zinc Oxide for Functional Textile Coatings: Recent Advances

Critical Analysis of the Characteristics of Industrial Effluents from the Textile Sector in Brazil

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