Studies on photodegradation of two commercial dyes in aqueous phase using different photocatalysts

Kansal, Sushil Kumar; Singh, Manmohan; Sud, Dhiraj

doi:10.1016/j.jhazmat.2006.07.035

Cited by 807 publications

(369 citation statements)

References 35 publications

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“…Electrochemical, ozonation, electro and photo-Fenton, photocatalysis, and heterogeneous photocatalysis are some of the processes that have been frequently proposed for the treatment of organic pollutants by many researchers in the recent literature. [7][8][9][10][11][12] In this context, the electrochemical processes are always claimed to be an attractive alternative to the degradation of organic pollutants. Versatility, easy operation, relatively lower cost, and no production of sludge during the treatment are some of the major advantages of the electrochemical approach.…”

mentioning

confidence: 99%

Electrochemical degradation of reactive dyes at different DSA® compositions

Silva¹,

Neto²,

Andrade³

2011

J. Braz. Chem. Soc.

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Este trabalho investiga a oxidação eletroquímica dos corantes azul reativo 4 (RB-4) e laranja reativo 16 (RO-16) utilizando ânodos dimensionalmente estáveis de RuO 2 . As eletrólises foram realizadas sob controle galvanostático em função do eletrólito de suporte e composição do material eletródico. As eletrólises feitas na presença ou ausência de NaCl foram capazes de remover totalmente a coloração da solução; no entanto, um aumento significativo da combustão do corante somente foi obtido para na presença de cloreto (valores de 80% de remoção de carbono foram atingido). Concentrações elevadas de cloreto não implicaram em aumento significativo de remoção da cor ou mineralização. A composição do óxido influência na destruição do corante (com ou sem cloreto), observa-se que Ti/Ru 0.30 Ti 0.70 O 2 é o material mais ativo para oxidação dos compostos investigados. A reação de desprendimento de oxigênio é uma reação paralela limitante em ambos os eletrólitos de suporte investigados, NaCl e Na 2 SO 4 , e a competição com a oxidação do composto orgânico ainda é um obstáculo. A análise da formação de compostos organoclorados (AOX) revela que existe um pequeno consumo das espécies formadas nos primeiros minutos de eletrólise, a composição Ti/(RuO 2 ) 0.70 (Ta 2 O 5 ) 0.30 é a composição com melhores características para emprego no tratamento ambientais. Tanto a composição como o eletrólito afetam a formação de compostos indesejáveis. This paper investigates the electrochemical oxidation of the reactive dyes reactive blue 4 (RB-4) and reactive orange 16 (RO-16) on RuO 2 dimensionally stable anode (DSA ® ) electrodes. Electrolysis was achieved under galvanostatic control as a function of supporting electrolyte and electrode composition. The electrolyses, performed in either the presence or absence of NaCl, were able to promote efficient color removal; moreover, at low chloride concentration (0.01 mol L -1 ), total color removal was obtained after just 10 min of electrolysis, and a significant increase in total dye combustion was achieved for all the studied anodes in chloride medium (reaching ca. . No significant enhancement in dye color removal or mineralization was observed upon increasing chloride concentration. The influence of oxide composition on dye elimination seems to be significant in both media (with or without chloride), being Ti/Ru 0.30 Ti 0.70 O 2 , the most active material for organic compound oxidation. The oxygen evolution reaction (OER) was shown to be a limiting reaction in both supporting electrolytes; i.e., NaCl and Na 2 SO 4 , and its competition with organic compound oxidation remained an obstacle. The adsorbable organo halogens (AOX) formation study revealed that there is slight consumption of the undesirable species formed within the first minutes of the electrolysis, being Ti/(RuO 2 ) 0.70 (Ta 2 O 5 ) 0.30 the most environmentally friendly composition. Both anode composition and chloride concentration affect the formation of these undesirable compounds.Keywords: reactive dyes, electrochemical oxidat...

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mentioning

confidence: 99%

Electrochemical degradation of reactive dyes at different DSA® compositions

Silva¹,

Neto²,

Andrade³

2011

J. Braz. Chem. Soc.

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“…Many researchers reported that AgNPs are highly capable, good and stable photocatalysts under ambient temperature with visible region for degrading organic compounds and dyes [13][14][15]. The catalytic activity of synthesized AgNPs on degradation of dye is demonstrated by using the MB dye by carrying the degradation process in the visible region.…”

Section: Catalytic Activity Of Agnps On Reduction Of Methylene Bluementioning

confidence: 99%

Application of silver nanoparticles synthesized fromRaphanus sativusfor catalytic degradation of organic dyes

Singh

Kumari

Patnaik

et al. 2016

MATEC Web of Conferences

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Abstract. Biosynthesis of metal nanoparticles is gaining more importance owing to its simplicity, economical, sustainable route of synthesis of nanoparticles and ecofriendliness. Based on the search to improve and protect the environment by decreasing the use of toxic chemicals and eliminating biological risks in biomedical applications, the present article reports an environment friendly and unexploited methods for biofabrication of silver nanoparticles (AgNPs) using Raphanus sativus leaf extract. The synthesized AgNPs were characterized by UV-vis spectroscopy and transmission electron microscopy (TEM). The absorption spectrum of the dark brown color silver colloids showed a single and prominent peak at 431nm, indicating the presence of AgNPs. Further, catalytic degradation of methylene blue (organic dye) by using AgNPs was measured spectrophotometrically. The results revealed that biosynthesized AgNPs was found to be impressive in degrading methylene blue and can be used in water purification systems.

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“…This limit depends on the nature of the pollutant and on the geometry and working conditions of the photoreactor corresponding to the maximum catalyst concentration in which all the particles are totally illuminated. Decrease of reaction rate at higher catalyst concentration may be due to decrease of light penetration or increase of light scattering (Kansal et al, 2007). Agglomeration and sedimentation of catalyst under high catalyst concentration may take place and available catalyst surface for photon absorption may decrease (San et al, 2007).…”

Section: Catalyst Concentrationmentioning

confidence: 99%