Equilibrium and kinetic studies on sorption of basic dyes by a natural biopolymer poly(γ-glutamic acid)

Inbaraj, Baskaran Stephen; Chien, John-Tung; Ho, Guan-Huei; Yang, Jing; Chen, B.H.

doi:10.1016/j.bej.2006.08.001

Cited by 103 publications

(56 citation statements)

References 34 publications

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“…2 Vários materiais vêm sendo avaliados como fases sólidas para a remoção de corantes catiônicos presentes em meio aquoso. [3][4][5][6][7][8][9][10][11][12] Apesar de seu extenso uso como fase sólida para remoção, separação ou mesmo pré-concentração de várias espécies químicas, as espumas de poliuretano (EPU) ainda não foram empregadas na remoção de corantes básicos presentes em meio aquoso. As EPU podem ser consideradas uma boa alternativa para este propósito, uma vez que se constituem em um material de baixo custo, estável, altamente disponível e de fácil manuseio.…”

Section: Introductionunclassified

Estudo da sorção do corante catiônico violeta cristal por espuma de poliuretano em meio aquoso contendo dodecilsulfato de sódio

Mori¹,

Cassella²

2009

Quím. Nova

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Recebido em 4/8/08; aceito em 17/4/09; publicado na web em 22/9/09 SORPTION OF CRYSTAL VIOLET BY POLYURETHANE FOAM FROM AQUEOUS MEDIUM CONTAINING SODIUM DODECYLSULFATE. This work presents a detailed study about the sorption of crystal violet (CV) cationic dye onto polyether type polyurethane foam (PUF). The sorption process was based on the formation of an ionic-pair between cationic dye and dodecylsulfate anion (SDS), which presented high affinity by PUF. Set-up employed in the study was built up by adjusting a 200 mg cylinder of PUF to the arm of an overhead stirrer. The system was characterized in relation to equilibrium and kinetic aspects and it was modeled by employing Langmuir and Freundlich isotherms. Obtained results showed that the ratio between SDS and MB concentrations played an important role on the sorption process. According to results found it was possible to retain up to 3.4 mg of dye from 200 mL of a 5.0 x 10 -5 mol L -1 CV solution containing 1.25 x 10 -4 mol L -1 SDS, which represented a removal efficiency of around 92%.Keywords: polyurethane foam; crystal violet; solid phase extraction. INTRODUÇÃOAtualmente, o desenvolvimento de novas tecnologias para o tratamento de efluentes é um dos assuntos mais importantes no âmbito das atividades industriais, uma vez que a legislação tem se tornado cada vez mais rigorosa em relação aos limites tolerados para descarga. A descarga de corantes presentes em efluentes industriais em corpos d´água naturais representa um sério problema ambiental, uma vez que, em muitos casos, estas substâncias apresentam grande resistência à degradação química, fotoquímica ou biológica.1 Neste contexto, as técnicas de separação por retenção em fase sólida vêm assumindo crescente importância.Os corantes catiônicos são largamente empregados em processos de tingimento de couros, papel e fibras acrílicas, uma vez que estes materiais possuem, em geral, grupos com características aniônicas. Atualmente cerca de quatrocentos corantes catiôni-cos são conhecidos, sendo que, destes, apenas oitenta e cinco encontram-se cadastrados no Color Index. O corante catiônico violeta cristal (VC), ou violeta genciana, objeto deste estudo, apresenta ainda outros usos além daqueles listados anteriormente, principalmente na área médica. Ele talvez seja o mais importante agente identificador de bactérias em uso na atualidade. Ainda, possui atividade antisséptica e antimicótica, sendo, por isto, emantisséptica e antimicótica, sendo, por isto, empregado em desinfetantes de intensidade moderada. Em hospitais tem aplicação para o tratamento de queimaduras sérias e outras lesões da pele e gengivas. É usado também em cirurgia plástica, dermatologia e em medicina estética para demarcação da pele. No Brasil é encontrado também em rações para aves, assim como para carimbar cortes de carne em matadouros. Sabe-se, ainda, que o violeta cristal pode estar sendo usado na condição de corante alimentício em aguardentes de mandioca. 2Vários materiais vêm sendo avaliados como fases sólidas para a remoção de corantes ca...

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Section: Introductionunclassified

Estudo da sorção do corante catiônico violeta cristal por espuma de poliuretano em meio aquoso contendo dodecilsulfato de sódio

Mori¹,

Cassella²

2009

Quím. Nova

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“…In order to monitor the kinetics of the adsorption of the dye over both adsorbents, a pseudo-second-order rate equation [44,45] was applied. The specific rate constants for both systems were calculated using following mathematical form:…”

Section: Kinetic Modelingmentioning

confidence: 99%

Adsorption of carmoisine A from wastewater using waste materials—Bottom ash and deoiled soya

Gupta

Mittal

Malviya

et al. 2009

Journal of Colloid and Interface Science

297

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a b s t r a c tThe present study deals with the application of bottom ash, a power plant waste, and deoiled soya, an agricultural waste, for the adsorptive removal of carmoisine A dye from its aqueous solutions. This paper incorporates a comparative study of the adsorption characteristics of the dye on these effective adsorbents along with effects of time, temperature, concentration, and pH. Analytical techniques have been employed to find pore properties and characteristics of adsorbent materials. Batch adsorption studies, kinetic studies, and column operations have also been performed to understand the dye extraction ability of the adsorbents. The adsorption behavior of the dye has been studied using Freundlich, Langmuir, Tempkin, and Dubinin-Radushkevich adsorption isotherm models. The monolayer adsorption capacity determined from the Langmuir adsorption equation has been found as 1.78 Â 10 À5 and 5.62 Â 10 À5 mol g À1 at 323 K for bottom ash and deoiled soya, respectively. Kinetic measurements suggest the involvement of pseudo-second-order kinetics in both adsorptions and each case is controlled by a particle diffusion process. Column experiments demonstrated that both adsorbents could be practically utilized in elimination of hazardous dye from effluent and dye material can be recovered by eluting NaOH through the exhausted columns.

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“…The maximum amounts of the dye adsorbed on the surface of the oxidised mesoporous carbon samples of regular structure are much higher than those adsorbed on the activated carbon samples and bagasse fly ash (Mall et al 2007). The carbon samples C KIT-6 modified with ammonium persulfate solution at 60 and 100°C also show higher sorption capacities towards AO than the natural biopolymer poly(cglutamic acid) (Inbaraj et al 2006). Only the natural untreated clay (NUC) is a more effective adsorbent of the basic dye studied than the functionalised mesoporous carbon samples synthesised (Ö ztürk and Malkoc 2014).…”

Section: Adsorption Studiesmentioning

confidence: 99%

The effect of surface modification of mesoporous carbons on Auramine-O dye removal from water

2015

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Mesoporous carbon of regular structure was subjected to oxidation by ammonium persulfate at 30, 60 or 100°C. The mesostructure and pore evolution were characterised by XRD, TEM, and N 2 sorption techniques. The functional groups present on the surface of the carbon materials were identified by FTIR and thermogravimetric studies. It was established that the micropores and small mesopores could be blocked by the surface oxides attached under mild oxidation. High densities of surface oxygen complexes, especially carboxylic groups, were generated on the surface of mesoporous carbons. All materials obtained were tested for the removal of Auramine-O from aqueous solution. Adsorption experiments were carried out as batch studies at different contact time, pH and initial dye concentration. Removal of this cationic dye in basic solutions was more effective than in acidic solutions. The highest sorption capacity towards Auramine-O was obtained for the carbon sample oxidised by ammonium persulfate solution at 100°C. Fitting equilibrium data to Langmuir and Freundlich isotherms showed that Langmuir model was more suitable to describe the Auramine-O adsorption. The changes in standard enthalpy (DH 0 ), standard entropy (DS 0 ) and Gibbs free energy (DG 0 ) were analysed. Thermodynamic study showed that the adsorption of Auramine-O was a spontaneous and exothermic process.

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Equilibrium and kinetic studies on sorption of basic dyes by a natural biopolymer poly(γ-glutamic acid)

Cited by 103 publications

References 34 publications

Estudo da sorção do corante catiônico violeta cristal por espuma de poliuretano em meio aquoso contendo dodecilsulfato de sódio

Estudo da sorção do corante catiônico violeta cristal por espuma de poliuretano em meio aquoso contendo dodecilsulfato de sódio

Adsorption of carmoisine A from wastewater using waste materials—Bottom ash and deoiled soya

The effect of surface modification of mesoporous carbons on Auramine-O dye removal from water

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