Investigation of strontium sorption onto Kula volcanics using Central Composite Design

Kütahyalı, Ceren; Çetinkaya, Berkan; Acar, M. Bahadır; Işık, Nuray Olcay; Cireli, İrfan

doi:10.1016/j.jhazmat.2011.11.047

Cited by 21 publications

(12 citation statements)

References 18 publications

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“…In the present study, the results indicated that the binding sites of the sorbent were distributed uniformly on its surface and the adsorption of Sr(II) was regarded as monolayer adsorption. e characteristics of the adsorption isotherms in this study were consistent with those in previous reports [36,43].…”

Section: Sorption Kineticssupporting

confidence: 92%

“…Sorption occurs only on the outer surface of the adsorbent. e Freundlich isotherm sorption equation can be applied to both single-layer sorption and nonuniform surface sorption [36,43]. In the present study, the results indicated that the binding sites of the sorbent were distributed uniformly on its surface and the adsorption of Sr(II) was regarded as monolayer adsorption.…”

Section: Sorption Kineticsmentioning

confidence: 58%

“…In general, the alkaline environment is more conducive to colloid sorption. e reason is the same as above, but the difference is that PM may be complex with CS forming macromolecules to adsorb Sr(II) [36]. e effect of sorption is better.…”

Section: Effect Of Phmentioning

confidence: 91%

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Effect of Colloidal Silicate on the Migration Behaviour of Strontium in Groundwater Environment of Geological Disposal Candidate Site

Zuo

Han

Shi

et al. 2019

Journal of Chemistry

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Various colloids are present in the natural groundwater environment, and colloids act on the processes involved when radionuclides leak from a repository in a high-level waste disposal site. is paper investigates the effect of colloidal silicate in natural groundwater environments on the migration behaviour of Sr(II). ree different experimental cases have been designed: (1) effect in the presence of colloidal silicate, (2) effect in the presence of a porous medium, and (3) effect in the presence of both colloidal silicate and porous medium (referred to as CS, PM, and PC, respectively). Batch experiments were used to study the effect of influencing factors on Sr(II) migration behaviour, such as the amount of CS, solid-to-liquid ratio, pH, contact time, and initial concentration of Sr(II). e experiments showed that the effect of PC on the migration behaviour of Sr(II) was greatest, and the presence of CS enhanced the sorption. e colloid amount, pH, and solid-to-liquid ratio significantly affected the migration behaviour. e more the colloids were added, the better the adsorption effect. e optimal pH and solid-to-liquid ratio were 6 and 20 : 1, respectively. e alkaline environment is more conductive to colloid sorption. When the solid-to-liquid ratio was 20 : 1, the sorption percentage of PC is 0.5 times larger than PM. Although the PC has a longer adsorption equilibrium time, the percentage of adsorption can be larger than that in the other two cases. e kinetics and isotherms of Sr(II) were best described by the pseudosecond-order and Langmuir models. It was inferred that strong chemical interactions and/or surface complexation contributed primarily to Sr(II) sorption, and the process was on the monolayer adsorption of the outer surface. ese findings provide valuable information for the migration behaviour of strontium in groundwater environments of geological disposal site. At the same time, it provides information for the implementation of permeable reactive barrier technology to control the transport of radioactive Sr(II) and its species in natural surface and groundwater.

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Section: Sorption Kineticssupporting

confidence: 92%

Section: Sorption Kineticsmentioning

confidence: 58%

See 1 more Smart Citation

Effect of Colloidal Silicate on the Migration Behaviour of Strontium in Groundwater Environment of Geological Disposal Candidate Site

Zuo

Han

Shi

et al. 2019

Journal of Chemistry

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“…The values of n greater than 1 show favorable ion exchange of metal on biomass. The Freundlich expression is an empirical equation based on a heterogeneous surface (Kutahyali, Cetinkaya, Acar, Isik, & Cireli, 2012). The corresponding Freundlich and Langmuir parameters along with correlation coefficients are reported in Table 6.…”

Section: +mentioning

confidence: 99%

Untitled

Çelik¹,

Aslani²,

Can³

2019

Turk. J. Fish. Aquat. Sci.

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The bioaccumulation of UO 2 2+ (uranyl ion) was investigated by using dry biomass of Botryococcus braunii. Experiments were conducted based on a rotatable central composite design (CCD) and analyzed using response surface methodology (RSM), which was used to optimize the bioaccumulation process. In this goal, the effects of parameters such as initial uranium (VI) concentration, pH, temperature and contact time were studied. The optimum conditions for maximum removal (87%) of UO 2 2+ from an aqueous solution were as follows: initial uranium (VI) concentration (55 mg/l), pH (3.6), temperature (46°C) and contact time (74 min). Langmuir and Freundlich isotherms and also thermodynamic parameters like Enthalpy (∆H°), Entropy (∆S°), standard Gibbs free energy (∆G°) were investigated, as well.

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“…The equilibrium is obtained when the monolayer formation on the sorbent occurs and all the sorption sites are considered identical and energetically equivalent, due to its homogeneous structure [2,27,[46][47][48][49]. The slope (1/K Lq m C e ) and the intercept (1/q m ) of the plot 1/q e versus 1/C e , sorption capacity and Langmuir constant are shown in Table 4.…”

Section: Sorption Isotherm Analysismentioning

confidence: 99%

Influence of pH, concentration and ionic strength during batch and flow-through continuous stirred reactor experiments of Sr2+-adsorption onto montmorillonite

Guimarães¹,

Azenha²,

Rocha

et al. 2014

J Radioanal Nucl Chem

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Sorption/desorption experiments in batch and continous flow-through stirred reactor under different experimental conditions were carried out using montmorillonite (\2 lm clay fractions). The Sr 2? amount desorbed at pH 4 is only half of the amount desorbed at pH 8, revealing that the retention of Sr 2? onto montmorillonite was enhanced at pH 4. The largest adsorption value was obtained at pH 8.0 ([KNO 3 ] = 10 -3 mol/L) with q m = 41.49 mg Sr 2? /g from the Langmuir isotherm. The gradient of concentration acted as an increasing driving force since the amount of Sr 2? adsorbed increased as increasing of Sr 2? concentration during the flow-through experiments.

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Investigation of strontium sorption onto Kula volcanics using Central Composite Design

Cited by 21 publications

References 18 publications

Effect of Colloidal Silicate on the Migration Behaviour of Strontium in Groundwater Environment of Geological Disposal Candidate Site

Effect of Colloidal Silicate on the Migration Behaviour of Strontium in Groundwater Environment of Geological Disposal Candidate Site

Untitled

Influence of pH, concentration and ionic strength during batch and flow-through continuous stirred reactor experiments of Sr2+-adsorption onto montmorillonite

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