Adsorption of reactive dyes from aqueous solution by dirty bentonite

Chinoune, Kheira; Bentaleb, Kahina; Bouberka, Zohra; Nadim, Abdelouahab; Maschke, Ulrich

doi:10.1016/j.clay.2016.01.006

Cited by 176 publications

(58 citation statements)

References 47 publications

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“…12,14 Usually, impregnation has been carried out using different transition metals and organometallic compounds of various elements such as Al, Zn, Fe, Ag, and Ti. [15][16][17] The utility of different transition metal is well-known in the eld of water treatment as these metals do not leach out into water owing to their high positive character. 18 Among different transition elements, zirconium is more superior over other elements in terms of efficiency, cost and toxicity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and sorption studies of a zirconium(iv) impregnated highly functionalized mesoporous activated carbons

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and sorption studies of a zirconium(iv) impregnated highly functionalized mesoporous activated carbons

et al. 2020

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“…The absorption band with a maximum at 831 cm -1 was assigned to vibrations of the Al-Mg--OH group, while the absorption band at 791 cm -1 corresponded to the vibration of the Mg-Fe-OH group. Absorption bands of high intensity at 511 and 467 cm -1 corresponded to deformation vibrations in the plane of Al-O-Si and Si-O-Si groups, respectively [15].…”

Section: Characterization Of Bentonite Claymentioning

confidence: 99%

“…The process of adsorption and photolytic degradation process of dyes, such as methylene blue, from aqueous solutions with polyaniline-titanium dioxide (PAni-TiO 2 ) nanocomposite represent a new removal technique for pollutants [13]. By raw or modified bentonite, the adsorption of the following direct and reactive dyes was investigated: Direct Red 2 [2], Direct Red 23 [14], Reactive Blue 2, Reactive Blue 19 [15], Reactive Red 223 [16], Reactive Black 5 [17], and Reactive Blue 19 [3]. Composite materials based on bentonite and xanthan or guar gum and based on the alumina reinforced polystyrene are also potential adsorbents for dyes [18][19][20].…”

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confidence: 99%

Application of activated bentonite for the removal of direct and reactive dye from aqueous solutions

Zdravković¹,

Stanković²,

Ristić³

et al. 2019

CI&CEQ

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Article Highlights • The suitable adsorbent for dye removal was obtained by activation of raw bentonite clay • Langmuir, Temkin and Dubinin-Radushkevich isotherms described the process of dye adsorption by clay • Physisorption was a significant mechanism of binding anionic dyes to the clay • The adsorption of DR 173 and RR 22 dyes is an endothermic process in nature • Activated bentonite clay had high adsorption/desorption capacities for dyes

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“…Негативно наелектрисање бентонита се приписује изоморфној супституцији Si 4+ јона тетраедарског слоја са Al 3+ јонима и Al 3+ јона октаедарског слоја са Mg 2+ јонима. Негативно наелектрисање је уравнотежено измeнљивим катјонима попут Cа 2+ и Nа + јона [6][7][8]. Хемијски састав бентонитне глине зависи од њеног порекла и одређује особине као што су налектрисање слоја, капацитет катјонске измене, адсорпциони капацитет и морфологију.…”

Section: уводunclassified

Adsorption of Ammonia by Base Activated Bentonite Clay Kinetic and Equilibrium Studies

Šmelcerović¹

2018

KIJ

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Nitrogen compounds are essential elements for living organisms. The increased concentration of ammonia in ionized (NH 4 + ) and non-ionized form (NH 3 ) in surface waters causes negative effects on aquatic organisms, since it enters into the nitrogen cycle, and thus contributes to the eutrophication of water. The presence of higher concentrations of ammonia in surface waters than natural ones is the result of faecal contamination through the sewage system or runoff from arable areas which were treated with fertilizer. Water contaminated with ammonia can be purified by various methods: biological (nitrification-denitrification method), oxidation with chlorine, chemical precipitation, membrane filtration, etc. One of the alternative methods is removal by adsorption with natural materials such as clay and zeolite. Bentonite clay was marked off as a suitable adsorbent of cationic pollutants due to the permanent negatively charged surface. Тhe textural properties (specific surface, porosity) and structural properties of bentonite clay (the distance between the layers, the type of ions in the space between the layers) and consequently its adsorption capacity for pollutants is changed with the activation by acid or base and intercalation. There is very little literature data on the application of bentonite clay for removal of ammonium ions. Therefore, the aim of this work is activating the raw bentonite clay with a base and its application as an adsorbent for removal of ammonium ions from aqueous solutions. The influence of the adsorption conditions (adsorbent dose, temperature, pH, adsorbate concentration and contact time) on the amount of removed ammonia from the aqueous solution was investigated. Equilibrium data were analyzed by Langmuir, Freundlich and Dubinin-Radushkevich isotherms. The best agreement with experimental data was obtained by Langmuir isotherm (R 2 = 0.987). The following kinetic models were applied: the pseudo-first order, pseudo-second order, and the intra-particle diffusion model. The pseudo-second order model is most suitable for describing the adsorption of ammonium ions onto the base activated bentonite from aqueous solutions (R 2 = 0.997). Removal of ammonium ions by activated clay is a pHdependent and endothermic process, the adsorption degree of pollutants is increased with rising temperature. The highest adsorption capacity of the base activated bentonite clay of 26.82 mg/g was obtained in a solution of pH 6 and a temperature of 40 °C, at an adsorbent dose of 2 g/dm 3 and аt an adsorbate concentration of 100 mg/dm 3 . By activating the adsorbent in a 1 M NaOH solution, the adsorption ability of the bentonite clay towards ammonium ions is improved. The results of this study show that the base activated bentonite clay is a potential adsorbent material for ammonia, i.e. ammonium ions. 1254 Слика 2. Зависност адсорбоване количине амонијум јона базно активираном бентонитном глином од температуре (а) и pH вредности (б)Највећи адсорпциони капацитет глине у испитиваном опсегу pH вредности (2-10) за...

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Adsorption of reactive dyes from aqueous solution by dirty bentonite

Cited by 176 publications

References 47 publications

Synthesis, characterization and sorption studies of a zirconium(iv) impregnated highly functionalized mesoporous activated carbons

Synthesis, characterization and sorption studies of a zirconium(iv) impregnated highly functionalized mesoporous activated carbons

Application of activated bentonite for the removal of direct and reactive dye from aqueous solutions

Adsorption of Ammonia by Base Activated Bentonite Clay Kinetic and Equilibrium Studies

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