Removal of cerium ions from aqueous solution by hydrous ferric oxide – A radiotracer study

Dubey, Som Shankar; Rao, B. Sanjeeva

doi:10.1016/j.jhazmat.2010.11.085

Cited by 30 publications

(19 citation statements)

References 15 publications

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“…This increase in adsorption may be either due to acceleration of slow adsorption steps or due to creation of some new active sites 36 or due to transport against a concentration gradient, and/or diffusion controlled transport across the energy barrier 37 . Similar behavior was reported for the adsorption of cerium ions on hydrous ferric oxide 38 . On contrary, Cs(I) ions revealed decrease in % uptake from 28 to 20% with increasing the temperature from 298 to 333 K. The reduction insorption efficiency against temperature may be attributed to desorption of physically adsorbed Cs + .…”

Section: Effect Of Temperature and Ion Selectivitysupporting

confidence: 84%

152/154Eu(III) Ions Sorption on Stannic Silicate Granules: A Radiotracer Study

2019

Chem Sci Trans

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Silicates and related porous materials are solids able to interact with guest molecules, ions and atoms not only at their surfaces but also within the bulk. With the objective of producing materials showing better sorption properties, a laboratory prepared stannic silicate in mixed SnO 2 @SiO 2 form was investigated as potential sorbent for retention of long lived radionuclides 152+154 Eu 3+ from aqueous solution containing 134 Cs + and 60 Co 2+. Sorption of Eu 3+ has been reported as a function of contact time, initial ion concentration and temperatureat a constant pH equal to 4. The uptake of Eu 3+ was found to be favored at high ion concentration, high temperature and no significant sorption took place after the first 4 h. A pseudo second order kinetic pattern fitted the sorption data well, while equilibrium was positively verified with Freundlich-type equation. Further, in attempt to enhance the separation efficiency of the studied radionuclides from aqueous medium, results showed that the sorption on SnSi was found strongly temperature-dependent. Ions equilibrium was found exothermic in case of 134 Cs + however it endothermic in case of both 60 Co and 134 Cs ions. Based on this contradict uptake, selectivity of ions has been estimated and separation of Eu 3+ from other competing ions was achieved.The thermodynamic parameters (∆G•, ∆H• and ∆S•) showed that the adsorption process is spontaneous and exothermic in case of 134 Cs + but it endothermic in case of the later studied ions.

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Section: Effect Of Temperature and Ion Selectivitysupporting

confidence: 84%

152/154Eu(III) Ions Sorption on Stannic Silicate Granules: A Radiotracer Study

2019

Chem Sci Trans

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“…As for the Ce(III) species, it represents the most abundant element of rare earth metals and has several applications in engineering, agriculture, catalysis, nuclear energy, metallurgy, pharmaceutical, and removal from radioactive wastes [82][83][84][85][86][87][88]. Cerium compounds are considered to be moderately toxic [89][90][91][92] with their tendency to accumulate in the bones, liver, heart and lung and to react with enzyme and phospholipids [93,94].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Removal and Recovery of Metal Ions and Dyes from Wastewater through Montmorillonite Clay Mineral

et al. 2019

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The main objective of this work was to evaluate the potential of Montmorillonite nanoclay (Mt), readily and inexpensively available, for the simultaneous adsorption (and removal) of two classes of pollutants: metal ions and dyes. The attention was focused on two “model” pollutants: Ce(III) and crystal violet (CV). The choice is due to the fact that they are widespread in wastewaters of various origins. These characteristics, together with their effect on human health, make them ideal for studies on water remediation. Moreover, when separated from wastewater, they can be recycled individually in industrial production with no or simple treatment. Clay/pollutant hybrids were prepared under different pH conditions and characterized through the construction of the adsorption isotherms and powder X-ray diffraction. The adsorption behavior of the two contaminants was revealed to be significantly different: the Langmuir model reproduces the adsorption isotherm of Ce(III) better, thus indicating that the clay offers a unique adsorption site to the metal ions, while the Freundlich model proved to be the most reliable for the uptake of CV which implies heterogeneity of adsorption sites. Moreover, metal ions do not adsorb at all under acidic conditions, whereas the dye is able to adsorb under all the investigated conditions. The possibility to modulate the adsorption features by simply changing the pH conditions was successfully employed to develop an efficient protocol for the removal and separation of the different components from aqueous solutions mimicking wastewaters.

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“…Luo et al, 1997;Park et al, 2004;Ji et al, 2009), agricultural (Guo, 1999), and medicinal (Talbert and Johnson, 1967;Kremer et al, 1981;Monafo et al, 1976) applications, as well as being of interest for its removal from radioactive and other wastes (Hagen, 2007;Dubey and Rao, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The removal and/or uptake of Ce and/or other RE from aqueous solutions on various adsorbents were investigated by various authors. For example, the adsorption of cerium was performed on hydrous ferric oxides (Dubey and Rao, 2011), on D152 (Xiong et al, 2008), and/or D155 resins (Chunhua, 2008) and biosorption on various wastes and/or soils (Li et al, 2001;Senol et al, 2008;Das and Das, 2013;Jaya Sre Varsihini et al, 2014).…”

Section: Introductionmentioning

confidence: 99%