Adsorption of uranium from aqueous solution on heat and acid treated sepiolites

Kilislioğlu, Ayben; Aras, Gozde

doi:10.1016/j.apradiso.2010.04.021

Cited by 45 publications

(25 citation statements)

References 14 publications

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“…96 The acid-treated forms of the clays termed SS200 and SC200 show a dramatic increase in the specific surface area, but the uranium adsorption capacity was not solely related to the specific surface area of the materials. This study found a lower amount of UO 2 21 ions adsorbed onto SS200 (S BET of 568.5 m 2 g À1 ) than that adsorbed onto untreated sepiolite (S BET of 325.2 m 2 g À1 ), probably due to the leaching of all Mg 21 interlayer ions and the collapse of the octahedral layer.…”

Section: Chemical Activation/conditioningmentioning

confidence: 99%

“…The applications of this isotherm model have found reasonable success for correlating various heavy metal-clay sorption systems 15,16,18,[89][90][91][92][93][94][95][96][97][98] with favourable adsorption nature and can be implied as the platform and most useful isotherm model for describing physical and chemical adsorption phenomena, both in gas and liquid phases.…”

Section: Isotherms Kinetics and Thermodynamics Evaluation Of Heavy Mmentioning

confidence: 99%

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CHAPTER 11. Natural Clays/Clay Minerals and Modified Forms for Heavy Metals Removal

Kurniawan¹,

Ismadji²,

Soetaredjo³

et al. 2014

Heavy Metals in Water

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Section: Chemical Activation/conditioningmentioning

confidence: 99%

Section: Isotherms Kinetics and Thermodynamics Evaluation Of Heavy Mmentioning

confidence: 99%

CHAPTER 11. Natural Clays/Clay Minerals and Modified Forms for Heavy Metals Removal

Kurniawan¹,

Ismadji²,

Soetaredjo³

et al. 2014

Heavy Metals in Water

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“…Subsequently, the sample was dried at 60˚C in an oven for 24 h. Then the sepiolite was mixed with 1.0 mol/L H 2 SO 4 in solid-liquid ratio of 1 g/10 mL [19,24,25], and the mixture was stirred continuously for a specified time at 25, 40, or 60˚C, subsequently the sepiolite solid was filtered under vacuum and washed several times, and then dried. Thus the obtained sample was denoted as the "acid treated sepiolite" sample.…”

Section: Acid and Heat Treatments Of The Sepiolite Samplementioning

confidence: 99%

Removal of tungsten from electroplating wastewater by acid- and heat-treated sepiolite

Wang

Chen

et al. 2015

Desalination and Water Treatment

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In this study, the removal of tungsten from electroplating wastewater by adsorption on sepiolite has been investigated. To improve its performance, the natural sepiolite, was treated using H 2 SO 4 , followed by a heat treatment. The results obtained from the adsorption experiments showed that the acid-and heat-treated sepiolite had much higher adsorption for tungsten compared to the untreated (natural) sepiolite. The pH and temperature were important parameters in the adsorption process: the tungsten adsorption onto the acid-and heat-treated sepiolite increased at a lower pH and higher temperature, and the maximum adsorption capacity of 48.3 mg/g was obtained at pH 4.0, 55˚C, initial concentration of tungsten of 300 mg/L, and the sepiolite to liquid ratio of 0.5 g/100 mL. The acid-and heattreated sepiolite was applied to electroplating industrial wastewater containing 265 mg/L tungsten, under the conditions of pH ≤ 6, 25-55˚C, more than 98% of tungsten was removed. It was concluded that the acid-and heat-treated sepiolite is a potential adsorbent that can be commercially used to remove the residual tungsten in industrial wastewater.

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“…Unlike other 2:1 trioctahedral silicates, it has discontinuities and inversions of the silica sheets that give rise to fine microporous channels of dimensions 0.37 9 1.06 nm [2] running parallel to the length of the fibers and a specific surface area of 300 m 2 /g, about 50% of which within the paralleled pores and the other half in the mesoporosity [3]. As a fibrous natural clay mineral, sepiolite has many advantages, such as abundant storage, low price, good properties, and reutilization, and moreover, it has a brilliant applicative prospect in the industrial fields of adsorption [4,5], rheology [6], and catalysis [7,8], due to its unique microporous structure.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis of porous materials from sepiolite

Wang

Jing

et al. 2011

Res Chem Intermed

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In order not only to manufacture a tough porous material from sepiolite but also to sustain the inherent properties of the sepiolite, a hydrothermal experiment was carried out under saturated steam pressure at 473 K for up to 24 h by mixing slaked lime. The experimental results show that the addition of slaked lime exerts a positive effect on the strength development, and the strength enhancement is found to be due to tobermorite and calcium silicate hydrate (CSH) gel formation. Curing time seems to condition the strength development. A fine particle size of sepiolite improves its activity during the hydrothermal process, thus offering a higher strength and quicker hardening rate of the synthesized specimen. The acid activation also has a beneficial effect on the strength development. The hardening mechanism of the synthesized specimen is different between the specimens synthesized with or without acid activation. The strength enhancement for sepiolite with acid activating is due mainly to CSH gel formation, instead of tobermorite formation without acid activation.

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Adsorption of uranium from aqueous solution on heat and acid treated sepiolites

Cited by 45 publications

References 14 publications

CHAPTER 11. Natural Clays/Clay Minerals and Modified Forms for Heavy Metals Removal

CHAPTER 11. Natural Clays/Clay Minerals and Modified Forms for Heavy Metals Removal

Removal of tungsten from electroplating wastewater by acid- and heat-treated sepiolite

Hydrothermal synthesis of porous materials from sepiolite

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