Adsorption of cationic dyes from aqueous solutions by sepiolite

Özdemir, Yasemin; Doğan, Mehmet; Alkan, Mahir

doi:10.1016/j.micromeso.2006.07.026

Cited by 159 publications

(71 citation statements)

References 45 publications

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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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Section: Introductionunclassified

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

Guiza

Zakaria

2013

rseau

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“…A slight decrease in nitroimidazole removal was often observed at a pH greater than 9. Extensive investigations on nitroimidazole adsorption have revealed that its uptake strongly depends upon the concentration and nature of the electrolyte ionic species added to the ion bath [36,37]. The effect of inorganic salt (KCl) on the adsorption rate of nitroimidazole on SiC NPs was investigated.…”

Section: Characterization Of Sic Nanoparticlesmentioning

confidence: 99%

Microwave-Assisted Synthesis of SiC Nanoparticles for the Efficient Adsorptive Removal of Nitroimidazole Antibiotics from Aqueous Solution

et al. 2017

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Abstract:Environmental pollution caused by the improper disposal of pharmaceuticals is a matter of global concern, and warrants immediate attention. Of particular concern is the aquatic contamination caused by the increasing use of antibiotics, which could give rise to superbugs. While researchers have mainly focused on improving the adsorption capacity of mostly activated carbon-based adsorbents, we have developed a non-conventional adsorbent (SiC nanoparticles) in the present work for the adsorptive removal of four different nitroimidazole antibiotics, namely metronidazole (MNZ), dimetridazole (DMZ), ronidazole (RNZ), and tinidazole (TNZ). In addition to the unique properties which are inherent to SiC, the present adsorbent not only possesses a high adsorption capacity, but also shows one of the highest adsorption rates; both of which are prerequisites for an efficient and cost-effective adsorption-based separation technology. Silicon carbide (SiC) nanoparticles, synthesized by a microwave-assisted method, were thoroughly characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and the Brunauer-Emmett-Teller method. The adsorption isotherm data were accurately described by the Langmuir isotherm model. On the other hand, the adsorption kinetics, closely represented by the pseudo-second order kinetic model, were faster than most previously reported adsorbents. The reaction rate constants were 0.0089, 0.0079, 0.0072, and 0.0055 g/(mg min), for MNZ, DMZ, RNZ, and TNZ, respectively.

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“…[1]. A number of investigations on sepiolite have been reported and continue to be carried out intensively [1,[24][25][26][27][28]. In this study, the removal of BR 18 onto KF/sepiolite was investigated.…”

Section: Introductionmentioning

confidence: 99%

Removal of Basic Red 18 onto modified sepiolite: Equilibrium, adsorption kinetics and thermodynamic studies

Turunç

2015

Eur. J. Chem.

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The adsorption of Basic Red 18 (BR 18) from aqueous solution onto KF modified sepiolite was carried out as a function of pH, initial dye concentration, contact time and temperature. The equilibrium data were evaluated according to Langmuir and Freundlich models. The experimental results showed that the best correlation was obtained on Freundlich model. The adsorption kinetics was examined with pseudo-first order, pseudo-second order and intraparticle diffusion models. The result was best fitted for pseudo-second order kinetic model. Thermodynamic investigations were also performed to determine ΔH°, ΔG° and ΔS°. The results indicated that the adsorption of BR 18 was exothermic and spontaneous.

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Adsorption of cationic dyes from aqueous solutions by sepiolite

Cited by 159 publications

References 45 publications

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

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

Microwave-Assisted Synthesis of SiC Nanoparticles for the Efficient Adsorptive Removal of Nitroimidazole Antibiotics from Aqueous Solution

Removal of Basic Red 18 onto modified sepiolite: Equilibrium, adsorption kinetics and thermodynamic studies

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