Studies on adsorption and separation characteristics of americium and lanthanides using a silica-based macroporous bi(2-ethylhexyl) phosphoric acid (HDEHP) adsorbent

Shu, Qiding; Khayambashi, Afshin; Zou, Qing; Wang, Xiaolong; Wei, Yuezhou; He, Liang; Tang, Fangqiong

doi:10.1007/s10967-017-5293-z

Cited by 17 publications

(14 citation statements)

References 28 publications

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“…HDEHP/SiO 2 -P adsorbent was synthesized by impregnating and immobilizing HDEHP into the macroporous SiO 2 -P particles. The relevant synthesis procedures were the same as Khayambashi et al (2016) and Shu et al (2017), and HDEHP supporting proportion about 33.3%. The surface characterization of macroporous HDEHP/SiO 2 -P by scanning electron microscopy has been reported in Shu et al (2017).…”

Section: Methodsmentioning

confidence: 99%

“…The relevant synthesis procedures were the same as Khayambashi et al. (2016) and Shu et al. (2017), and HDEHP supporting proportion about 33.3%.…”

Section: Methodsmentioning

confidence: 99%

“…In Shu et al (2017), the macroporous SiO 2 -P-based HDEHP adsorbent has shown well performance on adsorption and separation characteristics of 241 Am(III), Ce(III), Sm(III), Eu(III), Gd(III), and Tb(III) from nitric acid solutions. Herein, the main aim of this study was to synthesize the HDEHP/SiO 2 -P as a solid-phase adsorbent for adsorption of REEs from nitric acid solutions.…”

Section: Introductionmentioning

confidence: 99%

“…In Shu et al. (2017), the macroporous SiO 2 -P-based HDEHP adsorbent has shown well performance on adsorption and separation characteristics of 241 Am(III), Ce(III), Sm(III), Eu(III), Gd(III), and Tb(III) from nitric acid solutions.…”

Section: Introductionmentioning

confidence: 99%

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Studies on adsorption of rare earth elements from nitric acid solution with macroporous silica-based bis(2-ethylhexyl)phosphoric acid impregnated polymeric adsorbent

Shu

Khayambashi

Wang

2018

Adsorption Science & Technology

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For the adsorption and recovery of rare earth elements from aqueous nitric acid, solid-phase extraction resins were prepared by impregnating and immobilizing of bis(2-ethylhexyl)phosphoric acid extractant into the macroporous silica-based polymeric (SiO 2-P) particles. It was found that bis(2-ethylhexyl)phosphoric acid/SiO 2-P had higher adsorption distribution coefficient for heavy rare earth elements than for light rare earth elements. The adsorption capacity of Gd(III) was observed to be 0.315 mmol g À1 by bis(2-ethylhexyl)phosphoric acid/SiO 2-P in 0.1 M HNO 3 at 298 K, which increased slightly when increasing temperature from 298 to 323 K. The adsorption isotherms of Gd(III) matched well with the Langmuir and Freundlich models. The obtained thermodynamic parameters (ÁH o and ÁG o) showed that the adsorption of Gd(III) by bis(2-ethylhexyl)phosphoric acid/SiO 2-P was a spontaneous and exothermic process. This study also evaluated the chemical stability of bis(2-ethylhexyl)phosphoric acid/SiO 2-P treated with nitric acid at different temperatures and demonstrated that bis(2-ethylhexyl)phosphoric acid/SiO 2-P had considerable stability against nitric acid and heat.

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Section: Methodsmentioning

confidence: 99%

“…The relevant synthesis procedures were the same as Khayambashi et al. (2016) and Shu et al. (2017), and HDEHP supporting proportion about 33.3%.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studies on adsorption of rare earth elements from nitric acid solution with macroporous silica-based bis(2-ethylhexyl)phosphoric acid impregnated polymeric adsorbent

Shu

Khayambashi

Wang

2018

Adsorption Science & Technology

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“…For example, at 0.5 M HNO 3 , 650 µL of 1 M HNO 3 and 750 µL of 18 MΩ water were added to 100 µL of crude solution of 165 Er/ 166 Ho (initial concentration 0.9 M HNO 3 ). Every tube was shaken for 30 min [36,37] then allowed to rest and centrifuged for 20 min. 500 µL of each solution were extracted and diluted to 2 mL by adding 1.5 mL 18 MΩ water (geometry called as "Tube 2G").…”

Section: Separation 165 Er/ 166 Homentioning

confidence: 99%

First Steps at the Cyclotron of Orléans in the Radiochemistry of Radiometals: 52Mn and 165Er

et al. 2018

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This work describes the first real developments in radiochemistry around exotic radionuclides at the cyclotron of Orléans focusing on the radiochemistry of two radiometals 165 Er and 52 Mn. For these developments, targets were irradiated during 0.5-2 h at a maximum current of 2 µA. All activities have been determined by radiotracer method. The production of 165 Er from a natural Ho target that was irradiated is described. Higher activities of 165 Er were obtained via deuteron irradiation then proton with lower ratio 165 Er/ 166 Ho (400/1 to 8/1). By using LN2 resin, the separation of adjacent lanthanides was made on various concentrations of HNO 3 (0.3 to 5 M). Weight coefficients (Dw) were defined in a batch test. Then, the first tests of separation on a semi-automated system were made: the ratio 166+nat Ho/ 165 Er in an isolated fraction was significantly reduced (1294 ± 1183 (n = 3)) but the reliability and reproducibility of the system must be improved. Then, a new Cr powder-based target for 52 Mn production was designed. Its physical aspects such as mechanics, thermal resistance and porosity have been studied. Dw for various compositions of eluent Ethanol/HCl were evaluated by reducing contact time (1 h) comparative to the literature. A first evaluation of semi-automated separation Cr/Mn has been made.Instruments 2018, 2, 15 2 of 23 cyclotron of Orléans is of interest in producing radionuclides for analytical applications allowing for the validation of the separation by the radiotracer method [9] and a method as sensitive as Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). In this context, it was necessary to initiate tools and methodology in radiochemistry to develop further the accelerator in the area of medical radionuclides. However, two constraints relative to the choice of radionuclides were met at the cyclotron of Orléans. The first constraint was to produce gamma emission and the second was that the half-life of the radionuclide produced must be below 100 days (due to nuclear waste management considerations). Hence for the following work, we used 165 Er/Er, 166 Ho/Ho, 51 Cr/Cr and 52 Mn/Mn. Other tools to improve radiochemical separation based on resins, methodology, and target design must be developed. Two cases hereafter illustrate the method's development for the production and subsequent separation of 165 Er and 52 Mn.Instruments 2018, 3, 15 2 of 22 radionuclides for analytical applications allowing for the validation of the separation by the radiotracer method [9] and a method as sensitive as Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). In this context, it was necessary to initiate tools and methodology in radiochemistry to develop further the accelerator in the area of medical radionuclides. However, two constraints relative to the choice of radionuclides were met at the cyclotron of Orléans. The first constraint was to produce gamma emission and the second was that the half-life of the radionuclide produced must be below 100 days (due to nuclear waste management considerations)...

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HDEHP-CMPO/SiO2-P: a promising solid-phase extractant for uranium recovery from different acidic media

Khayambashi

Shu

Wei

et al. 2018

J Radioanal Nucl Chem

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Studies on adsorption and separation characteristics of americium and lanthanides using a silica-based macroporous bi(2-ethylhexyl) phosphoric acid (HDEHP) adsorbent

Cited by 17 publications

References 28 publications

Studies on adsorption of rare earth elements from nitric acid solution with macroporous silica-based bis(2-ethylhexyl)phosphoric acid impregnated polymeric adsorbent

Studies on adsorption of rare earth elements from nitric acid solution with macroporous silica-based bis(2-ethylhexyl)phosphoric acid impregnated polymeric adsorbent

First Steps at the Cyclotron of Orléans in the Radiochemistry of Radiometals: 52Mn and 165Er

HDEHP-CMPO/SiO2-P: a promising solid-phase extractant for uranium recovery from different acidic media

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