The sorption of Eu(III) on calcareous soil: effects of pH, ionic strength, temperature, foreign ions and humic acid

Wang, Y. Q.; Fan, Qiaohui; Li, P.; Zheng, Xinghua; Xu, Jing; Jin, Yiming; Wu, Wangsuo

doi:10.1007/s10967-010-0809-9

Cited by 26 publications

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“…Figure 8(a) shows the results of the adjustment of the experimental data using the linearized equation of the Elovich model [ 48 , 49 ]. The model parameters and the statistical coefficient were obtained plotting q t versus log⁡ t .…”

Section: Resultsmentioning

confidence: 99%

“…The precipitate obtained was heated to 1073 K for 3 h. With titanium pyrophosphate previously characterized, the retention capacity of Eu 3+ was evaluated as a chemical analogous for heavy metals (Cr 3+ and As 3+ ) and actinides (Ac 3+ ) [ 47 , 48 ]. It is well known that the europium ionic radius is similar to Cr 3+ , As 3+ , and Ac 3+ radii, which results in a similar physicochemical behavior [ 49 ]. Additional, modeling the sorption of the europium onto the titanium pyrophosphate as a function of the pH using a surface complexation model was performed.…”

Section: Introductionmentioning

confidence: 99%

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Titanium Pyrophosphate for Removal of Trivalent Heavy Metals and Actinides Simulated by Retention of Europium

Ortiz-Oliveros

Flores-Espinosa

Ordóñez-Regil

et al. 2017

The Scientific World Journal

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This work addresses the synthesis of titanium pyrophosphate, as well as the characterization and evaluation of the sorption process of europium, for removal of trivalent heavy metals and actinides simulate. The evaluation of the surface properties of titanium pyrophosphate was carried out determining the surface roughness and surface acidity constants. The values obtained from the determination of the surface roughness of the synthesized solid indicate that the surface of the material presents itself as slightly smooth. The FITEQL program was used to fit the experimental titration curves to obtain the surface acidity constants: log⁡K+ = 3.59 ± 0.06 and log⁡K− = −3.90 ± 0.05. The results of sorption kinetics evidenced that the pseudo-order model explains the retention process of europium, in which the initial sorption velocity was 8.3 × 10−4 mg g−1 min−1 and kinetic constant was 1.8 × 10−3 g mg min−1. The maximum sorption capacity was 0.6 mg g−1. The results obtained from sorption edge showed the existence of two bidentate complexes on the surface.

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Section: Resultsmentioning

confidence: 99%