Adsorption of Congo red from aqueous solutions onto Ca-bentonite

Lian, Lili; Guo, Liping; Guo, Caixia

doi:10.1016/j.jhazmat.2008.03.063

Cited by 369 publications

(124 citation statements)

References 35 publications

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“…The phenomenon may be due to the acceleration of originally slow adsorption or the creation of some new active sites on the adsorbent surface (Daifullah 2004). Similar results have been reported for the adsorption of Congo red onto Ca-bentonite (Lian 2009) Fig. 3 Effect of initial adsorbate concentration and contact time on the adsorption of PC onto bentonite at 303K.…”

Section: Effect Of Initial Adsorbate Concentration Contact Time and supporting

confidence: 73%

Adsorption of Polycarboxylate-based Superplasticizer onto Natural Bentonite

Wang

Zheng

Feng³

et al. 2012

ACT

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The adsorption of polycarboxylate-based superplasticizer onto natural bentonite was investigated in aqueous solution using a batch technique with respect to initial adsorbate concentration, contact time, temperature, pH value and ionic strength. Lower pH value and higher ionic strength were proved to be favorable for the adsorption. The pseudo-first-order, pseudo-second-order and intraparticle diffusion models were used to describe the kinetic data and the kinetic constants were also determined. The experimental data fitted the pseudo-second-order model well. The Langmuir, Freundlich and Dubinin-Radushkevich (D-R) equations were applied to describe the equilibrium isotherm and the isotherm constants were also evaluated. The langmuir model agreed with the experimental well. Thermodynamic parameters ( Δ G 0 , Δ H 0 and Δ S 0 ) indicated that the adsorption was endothermic and physical in nature.

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Section: Effect Of Initial Adsorbate Concentration Contact Time and supporting

confidence: 73%

Adsorption of Polycarboxylate-based Superplasticizer onto Natural Bentonite

Wang

Zheng

Feng³

et al. 2012

ACT

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“…Pour cela, plusieurs types de traitement ont été proposés par l´osmose inverse, la précipitation/ coagulation des matières colorantes, l'adsorption sur charbon actif, et se sont révélés efficaces mais, dans la plupart des cas, très onéreux (BALLAY et BLAIS, 1998;NEVINE, 2008;RODRIGUEZ et al, 2009). Plusieurs auteurs ont étudié l'adsorption de colorants sur divers matériaux naturels tels que les argiles (ALIAN et al, 2010;ALKAN et al, 2007;BAGANE et GUIZA, 2000;BAGANE et GUIZA 2002;BULUT et al, 2008;CHI et EGGLETON, 1999;ÖZDEMIR et al, 2006;GHOSH et BHATTACHAYYA, 2002;LIAN et al, 2009;REYAD et TUTUNJI, 2003;SCHOONHEYDT et JOHNSTON, 2006;VIMONSES et al, 2009b), les matières agricoles : bagasse (MALL et al, 2006), épis de maïs, coquille de noix, etc., et certains rejets industriels : déchets de laine (PERINEAU et al, 1983), cendres volantes, (BHATNAGAR et MINICHA, 2006;EL GEUNDI, 1990) boues de haut fourneaux (ALLEN et KOUMANOVA, 2005) en raison de leurs disponibilités et leurs faibles coûts par rapport au charbon actif.…”

Section: Introductionunclassified

Étude cinétique de l’adsorption du rouge de Congo sur une bentonite

Guiza

Zakaria

2013

rseau

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L’avancement industriel et technologique à l'échelle mondiale a introduit des polluants de natures diverses dans l'eau. Les polluants peuvent être des contaminants organiques et des métaux lourds. Leur présence dans des effluents industriels où l'eau potable est un problème de santé publique en raison de leur absorption et, par la suite, leur accumulation dans l’organisme humain. Les règlements de pollution de l'eau exigent que les industries textiles réduisent considérablement la quantité de colorants dans leurs rejets. L'adsorption, procédé de traitement des eaux usées, exploite la capacité de quelques solides pour concentrer certaines substances sur leurs surfaces. Généralement, l’adsorbant le plus utilisé pour le traitement des effluents textiles est le charbon activé. La capacité de la bentonite pour enlever la couleur a été reconnue il y a quelque temps. Dans ce travail, nous avons étudié la cinétique d’adsorption d’un colorant acide, le rouge de Congo, en solution aqueuse sur un matériau argileux naturel (bentonite) dans un processus en lots. La concentration initiale du colorant était de 30 mg•L‑1 déterminée par une méthode spectrophotométrique. L’influence de certains paramètres, comme la vitesse d’agitation, la masse d’argile en solution, la concentration initiale du colorant et la granulométrie a été étudiée. Les résultats ont montré pour la vitesse d’adsorption : (i) une augmentation avec la vitesse d’agitation et la masse d’argile et, (ii) une décroissance avec la concentration initiale en colorant et la granulométrie. Cinq modèles de transport externe ont été étudiés et ont montré que l’ordre de grandeur du coefficient, kf, se trouve dans la gamme de 10‑5 à 10‑4•ms‑1.Industrial growth and technological advancement have led globally to the introduction of pollutants of diverse nature into water bodies. Such pollutants include dyes, organic contaminants and heavy metals. Their presence in industrial effluents or drinking water is a public health problem, due to their absorption and possible accumulation in living organisms. Water pollution regulations require textile dye industries to reduce substantially the amount of colour in their effluents. Adsorption, as a wastewater treatment process, exploits the ability of some solids to concentrate certain substances from solution onto their surface. The most commonly used adsorbent for the treatment of textile effluents is activated carbon. The ability of bentonite to remove colour was recognized some time ago. Batch adsorption experiments are used easily in the laboratory for the treatment of small volumes of effluents. Batch adsorption provides certain preliminary information such as the pH for maximum adsorption, the maximum initial dye concentration, the particle size for optimum adsorption, the mass of adsorbent, the temperature and time of the separation process. Experiments were conducted in this study using bentonite. The dye used in all experiments was Congo red. The initial dye concentration was 30 mg•L‑1 and was determined spectrophotometrically ...

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“…The value of R L calculated from the above expression. The nature of the adsorption process to be either unfavorable (Lian et al 2009). Here, R L values obtained are listed in Table 2.…”

Section: Freundlich Isothermmentioning

confidence: 99%

“…Many researchers used various adsorbent for removal of CR from aqueous solution such as fly ash (Dizge et al 2008), bentonite (Lian et al 2009), montmorillonite (Wang and Wang 2008), chitosan (Chatterjee et al 2009), organoattapulgite (Chen and Zhao 2009), activated carbon (Lorenc-Grabowska and Gryglewicz 2007; Namasivayam and Kavitha 2002;Purkait et al 2007), bottom ash and deoiled soya (Mittal et al 2009), Azadirachta indica leaf powder (Bhattacharyya and Sharma 2004), Trametes versicolor (Binupriya et al 2008), jute stick powder (Panda et al 2009), Aspergillus niger (Fu and Viraraghavan 2002), cattail root (Hu et al 2010a, b), anilinepropylsilica xerogel (Pavan et al 2008), perlite (Vijayakumar et al 2009), sawdust (Jain and Sikarwar 2008), rice husk ash (Chowdhury et al 2009), mesoporous hematite (a-Fe 2 O 3 ) (Yu et al 2008) and CNTs/b-FeOOH (Song et al 2012). However, some of these adsorbents do not have good adsorption capacities for anionic dyes.…”

Section: Introductionmentioning

confidence: 99%

Ferrous oxalate, maghemite and hematite nanorods as efficient adsorbents for decontamination of Congo red dye from aqueous system

Dhal

Mishra

Hota

2014

Int. J. Environ. Sci. Technol.

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In this present study, we have synthesized ferrous oxalate nanorods by a modified co-precipitation methods. The obtained nanomaterial (ferrous oxalate nanorod) was calcined at higher temperatures to form both maghemite and hematite nanorods. The morphology, size, crystalline phases, formation and surface area of the nanorods were characterized by scanning electron microscope, transmission electron microscope, X-ray diffraction, Fourier transform infrared spectroscope, ultraviolet-visible diffuse reflectance spectroscope and Brunauer-Emmett-Teller surface area analytical techniques. The results showed that high-yield aligned nanorods with a typical diameter of 100-200 nm and length up to micrometers were formed. The obtained rod-shaped nanomaterials (i.e., ferrous oxalate, maghemite and hematite) were used as adsorbents and were applied to remove Congo red (CR) dye molecules, which was used as a model of organic pollutants in aqueous solution. The adsorption isotherms and kinetics of removal of CR were studied. It was found that the adsorption capacity of maghemite nanorod is highest among the three adsorbents and can be regarded as an effective adsorbent for removal of CR from aqueous solution.

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Adsorption of Congo red from aqueous solutions onto Ca-bentonite

Cited by 369 publications

References 35 publications

Adsorption of Polycarboxylate-based Superplasticizer onto Natural Bentonite

Adsorption of Polycarboxylate-based Superplasticizer onto Natural Bentonite

Étude cinétique de l’adsorption du rouge de Congo sur une bentonite

Ferrous oxalate, maghemite and hematite nanorods as efficient adsorbents for decontamination of Congo red dye from aqueous system

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