Studies of Eu(III) sorption on TiO2: Effects of pH, humic acid and poly(acrylic acid)

Xu, Jing; Fan, Qiaohui; Niu, Zhiwei; Li, Yan; Li, Ping; Wu, Wangsuo

doi:10.1016/j.cej.2011.10.079

Cited by 22 publications

(14 citation statements)

References 39 publications

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“…10 showed that the low concentration of HA could enhance the adsorption of Eu(III) on FeNi-RGO with dependent of pH, while the maximum adsorption amount was not affected. However, when the concentration of HA was up to 20 mg/L in adsorption system, HA also could promote the adsorption of Eu(III) on FeNi-RGO at pH below 5, but with the increasing of pH (5)(6)(7)(8), the Eu(III) adsorption began to reduce, and then maintained a stable state at over pH 8. Our previous work had indicated the species of Eu(III) in the presence of HA [7].…”

Section: Effects Of Anions and Cationsmentioning

confidence: 91%

“…Tan et al also found that the ionic strength-independence of Eu(III) adsorption on both rutile and anatase was observed in NaCl electrolyte solution [6]. Xu et al also reported that the ionic strength of NaCl did not have obvious effect on the adsorption of Eu(III) on SiO 2 [7]. However, Fan et al [2] found that the adsorption of Eu(III) on attapulgite hotly depend on pH and ionic strength, which were mainly attributed to the surface charge density and the permanent negative charge.…”

Section: Kinetic Processmentioning

confidence: 92%

“…studied the sorption of Eu(III) on TiO 2 using an X-ray photoelectron spectroscopy as well as an extended X-ray absorption fine structure techniques, found that the interatomic distance of Eu-Ti under various conditions clearly stated that innersphere complexes on TiO 2 predominated in the observed pH range. Xu et al [6,7] also found that the presence of HA and poly(acrylic acid), PAA strongly enhanced Eu(III) sorption onto TiO 2 surface in low pH, while because of the forming of soluble Eu-HA/PAA complexes at high pH, the negative effects were observed. Similarly, some researchers reported [3] that the sorption Eu(III) on multiwall carbon nanotubes/ iron oxide magnetic composite was strong enhanced by PAA at below pH 4.5, whilst decreased obvious above pH 5.0 for the formation of the soluble Eu-PAA complexes.…”

Section: Introductionmentioning

confidence: 92%

“…And our previous work of the speciation of Eu(III) in aqueous solution showed that Eu 3? was the main species ([95 %) below pH 6; in pH range of 7-8, the predominant species were EuCO þ 3 (*58 %) and Eu(OH) þ 2 (*20 %), and with increasing of pH, the carbonates gradually took a more and more important role in alkaline condition, thus the main species was Eu(CO 3 Þ À 2 at pH [9 [7]. Therefore, because of high concentration of H ?…”

Section: Kinetic Processmentioning

confidence: 98%

“…Yet, the detailed influence mechanism of Fon the adsorption of metal on adsorbents was necessary to further study (Table 1). HA was a major fraction of aquatic organic colloids, and had a large of carboxylic groups, hydroxyl groups and so forth, which were capable of forming complexes with metal ions easily [7]. Thus, it was great important to investigate the effect of HA on the adsorption of metal ions on various adsorbents.…”

Section: Effects Of Anions and Cationsmentioning

confidence: 99%

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Adsorption of Eu(III) on defective magnetic FeNi/RGO composites: effect of pH, ion strength, ions and humic acid

Tian

Liu

et al. 2014

J Radioanal Nucl Chem

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The defective magnetic iron-nickel-graphene (FeNi-RGO) complexes were synthesized for investigating the adsorption of Eu(III) ions from aqueous solutions as a function of pH, solid-to-liquid ratio, ion strength, anions, cations and humic acid (HA). The adsorption of Eu(III) on FeNi-RGO was significantly dependent on pH and weakly dependent on ionic strength, anions and cations. HA could promote the adsorption of Eu(III) on FeNi-RGO at low pH while inhibited that at high pH with depending on the HA concentration. The results of this work were helpful for extraction and separation useful radionuclides from radioactive wastewater.

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Section: Effects Of Anions and Cationsmentioning

confidence: 91%

Section: Kinetic Processmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 92%

Section: Kinetic Processmentioning

confidence: 98%

Section: Effects Of Anions and Cationsmentioning

confidence: 99%

See 3 more Smart Citations

Adsorption of Eu(III) on defective magnetic FeNi/RGO composites: effect of pH, ion strength, ions and humic acid

Tian

Liu

et al. 2014

J Radioanal Nucl Chem

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Use of laponite as adsorbents for Ni(II) removal from aqueous solution

Cao

Yan

Huang

et al. 2017

Env Prog and Sustain Energy

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Silicate‐bearing hectorites (laponite) were synthesized by hydrothermal method, and the laponite sample was characterized by Fourier transform infrared (FTIR) spectroscopy, X‐ray diffraction (XRD), zeta potential, Brunauer‐Emmett‐Teller (BET) surface area, and pore size analyses. The adsorption of Ni(II) from aqueous solution on laponite as a function of contact time, pH, ionic strength, laponite dosage, and temperature was studied via batch technique. The maximum removal of 99% (approx) could be achieved at the optimum adsorbent dosage of 2.5 g L−1 and near‐neutral pH. Adsorption of Ni(II) on laponite is strongly dependent on pH but independent on ionic strength. At low pH, the adsorption of Ni(II) was dominated by ion exchange with Li+ on laponite surfaces, whereas inner‐sphere surface complexation and surface precipitation were the main adsorption mechanisms at near‐neutral pH and alkaline environment, respectively. The adsorption kinetic data of Ni(II) on laponite were well described by the pseudo‐second‐order kinetics model. The intraparticle diffusion was involved in the adsorption process but was not the only rate‐controlling step. The adsorption isotherms of Ni(II) on laponite can be described well by the Langmuir model and the maximum Ni(II) adsorption capacity of laponite obtained from Langmuir model was 65.79 mg g−1. The thermodynamic studies indicated that the adsorption of Ni(II) on laponite was endothermic and spontaneous. The laponite exhibited excellent adsorption properties for Ni(II) uptake compared with various adsorbents, indicating that it is a suitable material as an adsorbent for preconcentration and immobilization of Ni(II) from aqueous solution. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 942–950, 2018

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Uptake of Europium(III) from Water using Magnetite Nanoparticles

Carvalho

Daniel‐da‐Silva

Trindade

2016

Part. Part. Syst. Charact.

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It is demonstrated that colloidal magnetite nanoparticles can be used as nanosorbents for lanthanide ions dissolved in water. In particular, a series of experiments are performed for the removal of Eu(III) in distinct analytical conditions and by applying an external magnet to collect the sorbents previously dispersed in water samples. Furthermore, strategies for surface chemistry functionalization are also investigated, aiming to investigate the effect of this parameter on the removal capacity of the Fe3O4 nanoparticles. The supernatant solutions are monitored for the remaining amount of Eu(III) by fluorescence emission measurements in the presence of 2,6‐pyridinedicarboxylic acid as a sensitizer. The results demonstrate that neat Fe3O4 nanoparticles are capable of capturing lanthanide ions (III) from aqueous solutions (pH 7), without need of surface modification, and for subsequent removal by magnetic separation. During the removal, efficiency is increased after modifying the particles' surfaces with silica and 3‐aminopropyltrimethoxysilane; in alkaline medium (pH 10), there is complete removal regardless the type of nanosorbent used. This has been explained by the formation of insoluble Eu(III) species that adsorb strongly to the nanosorbents surfaces allowing their subsequent magnetic separation.

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Studies of Eu(III) sorption on TiO2: Effects of pH, humic acid and poly(acrylic acid)

Cited by 22 publications

References 39 publications

Adsorption of Eu(III) on defective magnetic FeNi/RGO composites: effect of pH, ion strength, ions and humic acid

Adsorption of Eu(III) on defective magnetic FeNi/RGO composites: effect of pH, ion strength, ions and humic acid

Use of laponite as adsorbents for Ni(II) removal from aqueous solution

Uptake of Europium(III) from Water using Magnetite Nanoparticles

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