Degradação de corantes têxteis e remediação de resíduos de tingimento por processos Fenton, foto-Fenton e eletro-Fenton

Salvador, Terezinha; Marcolino‐Júnior, Luiz H.; Peralta‐Zamora, Patricio

doi:10.1590/s0100-40422012000500013

Cited by 14 publications

(4 citation statements)

References 17 publications

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“…13 n. 5, e2243 -Taubaté 2018 does not decompose rapidly in water and molecular oxygen (Brito et al, 2015). In addition, the high presence of H2O2 prevents a visualization of spectral changes in wavelengths between 200-300 nm, although in this article it was possible to determine the decrease of signals in these regions, which may indicate a degradation of aromatic intermediates (Salvador et al, 2012).…”

Section: • +mentioning

confidence: 98%

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2018

Rev. ambiente água

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Cowpea is a crop with great economic, social and food importance in semi-arid regions, but its production is drastically reduced by the water deficit in these regions, requiring better management strategies that allow the crop's production. This study therefore aimed to evaluate the photosynthetic efficiency and production of cowpea cultivars under deficit irrigation replacement levels. The experiment tested three cowpea genotypes (G1 = 'BRS Aracé', G2 = 'BR 17 Gurguéia' and G3 = 'BRS Marataoã') and four irrigation depths (40, 60, 80 and 100% of ETc), resulting in a 3 x 4 factorial scheme, arranged in randomized complete blocks design with four replicates. During the experiment, the gas exchanges, chlorophyll a fluorescence and production of the cowpea genotypes under deficit irrigation were evaluated. Carbon fixation in the photosynthetic metabolism of cowpea plants was reduced by accentuated water deficit, regardless of the genotype. The low stress severity was indicated by the lack of effects on chlorophyll fluorescence, indicating that the reduction in the rate of carbon assimilation was due to the stomatal effects. The irrigation with 80% of ETc can be used in the cultivation of the respective cultivars, but with small losses in the production. Among the genotypes, 'BRS Marataoã' stands out with respect to yield, with higher values for weight of pods and green beans.

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Section: • +mentioning

confidence: 98%

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2018

Rev. ambiente água

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“…6,7 Diante deste cenário de resistência dos corantes têxteis frente a processos de natureza biológica, do caráter não destrutivo de muitas propostas de tratamento, além da problemática relacionada à geração e disposição do lodo químico e biológico, os processos oxidativos avançados, conhecido como POA's, vêm se destacando nos últimos anos e são apresentados como uma alternativa para a remoção de poluentes persistentes e de efluentes com elevada carga orgânica, quando os tratamentos convencionais não alcançam a eficiência necessária. 8,9 Os POA's são processos baseados na produção in situ do radical hidroxila (HO • ), que apresenta um alto potencial padrão de redução (2,73 V vs EPH), o que lhe confere alta capacidade oxidativa, e assim o torna uma boa alternativa para promover a degradação de diversas moléculas orgânicas, sendo capaz de produzir alterações profundas na estrutura química dos poluentes, podendo inclusive levar à sua completa mineralização. Em águas residuárias coloridas, que apresentem em sua composição corantes do tipo azocorantes, os radicais hidroxila atacam as ligações azo insaturadas do cromóforo, descolorindo assim o efluente.…”

Section: Introductionunclassified

Degradation of Textile Dye Using the Advanced Oxidation Processes Photo- Fenton and Solar Photo-Fenton

França¹,

Neto²,

Rios³

et al. 2021

Rev. Virtual Quim.

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The present work aimed to evaluate the efficiency of the photo-Fenton process assisted by artificial or solar light applied in the treatment of synthetic textile effluent. For the study of solar radiation was designed and built a solar reactor type Compound Parabolic Collector (CPC), and the efficiency of the treatment was analyzed in terms of color removal, chemical oxygen demand (COD) and spectral scanning of samples. The results obtained showed that the photo-Fenton process was efficient in discoloring the effluent, with emphasis to the study conducted by sunlight that in all operational conditions of work presented removal rates above 90%. In terms of COD, the best efficiency was obtained when 1250 mg L -1 e :62,5 mg L -1 showing rates of 85.40% and 50.20% for the process with artificial or solar light respectively.

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“…Among these activities, the textile effluents stand out because they are strongly colored due to the presence of dyes that do not bind to the fiber during the dyeing process (Kunzet al, 2002;Favere et al, 2010;Salvador et al, 2012). According to Sousa and Zamora (2005), the fact that they use large amounts of water associated with the low utilization of the inputs (dyes, detergents, gummings, softeners and others), makes the textile industry responsible for the large generation of waste volumes, with high organic load and strong staining.…”

Section: Introductionmentioning

confidence: 99%