Analysis and modeling of fixed bed sorption of cesium by AMP-PAN

Mahendra, Ch.; Sai, P M Sathya; Babu, C. Anand; Revathy, Krishnan; Rajan, K.K.

doi:10.1016/j.jece.2015.05.002

Cited by 21 publications

(8 citation statements)

References 36 publications

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“…This level of irradiation thus has little or no effect on the ion exchange properties of both AMP and AMP-PAN. K d values for Cs + at both concentrations tested remained above 10,000 after 24 h. Under the conditions we tested, both AMP and AMP-PAN follow pseudo-second-order absorption kinetics adhering to the Langmuir isotherm, mirroring previous results [20,30,36]. We have thus demonstrated the efficacy of AMP-PAN as a Cs ion exchange composite under the Cs + concentrations and acidity of spent fuel dissolver conditions following exposure to significant levels of gamma radiation.…”

Section: Discussionsupporting

confidence: 88%

“…The isothermal parameters and regression coefficients calculated from this data and the equivalent Freundlich isotherm interpretation [29] are presented in Table 1. As the data presented in Figure 4 demonstrate, the observed uptake of Cs + by AMP and AMP-PAN fits the pseudo-second-order Langmuir isotherm with a high regression coefficient (R 2 ), mirroring the previous work of Mahendra, Herbst, and Ding [20,30,35]. While the regression coefficients (R 2 ) for the Freundlich isotherm are close to 1, slopes of the lines produced by this method were negative, indicating a poor fit to the technique.…”

Section: Ion Exchange Performancesupporting

confidence: 84%

“…At complete (100%) uptake, Kd = ∞. Figure 4 highlights the affinity of AMP for Cs + is maintained [30] across the range of concentrations tested, with irradiation having a negligible impact on the uptakes. Figure 5A-D show the Langmuir (Equation (3c)) isotherm plots for virgin and irradiated AMP and AMP-PAN exposed to 5.0 and 10.0 mM Cs + .…”

Section: Ion Exchange Performancementioning

confidence: 96%

“…Rearranging these equations give straight line plots for pseudo-first-order Langmuir (Equation (3b)) or second-order Langmuir or Freundlich (Equations (3c) or (4b)) processes [29]. Q 0 and K l are the Langmuir constants for absorption capacity (mg/g) and energy of adsorption (L/g), and K f and n are the Freundlich constant (mg/g) and the adsorption intensity constant, respectively [29][30][31].…”

Section: Ion Exchange Performancementioning

confidence: 99%

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The Effect of Gamma Irradiation on the Ion Exchange Properties of Caesium-Selective Ammonium Phosphomolybdate-Polyacrylonitrile (AMP-PAN) Composites under Spent Fuel Recycling Conditions

et al. 2019

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The caesium radioisotopes 134Cs, 135Cs, and 137Cs are highly problematic medium-lived species produced during nuclear fission, due to their high radioactivity and environmental mobility. While many ion exchange materials can readily isolate Cs+ ions from neutral or basic aqueous solutions, only ammonium phosphomolybdate (AMP) functions effectively in acidic conditions, removing caesium even down to trace levels. Composites of AMP in a porous polymeric support such as polyacrylonitrile (PAN) can be used to selectively remove Cs+ ions from acidic aqueous decontamination liquors as well as other liquid wastes, and are promising for the isolation of Cs+ isotopes in spent fuel reprocessing. While both AMP and PAN have demonstrable acid stability, and PAN has known resistance to gamma radiation, AMP-PAN composites have received only a limited analysis of their physiochemical and ion exchange performance following irradiation. In this publication, we explore the effect of high levels of gamma irradiation on the ion exchange properties of AMP and AMP-PAN as a Cs+-selective adsorbent under spent fuel dissolver liquor concentrations and acidity. We demonstrate no significant reduction in performance with respect to uptake kinetics or capacity upon irradiation, abiding by the same absorption mechanism observed in the established literature.

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Section: Discussionsupporting

confidence: 88%

Section: Ion Exchange Performancesupporting

confidence: 84%

Section: Ion Exchange Performancementioning

confidence: 96%

Section: Ion Exchange Performancementioning

confidence: 99%

See 2 more Smart Citations

The Effect of Gamma Irradiation on the Ion Exchange Properties of Caesium-Selective Ammonium Phosphomolybdate-Polyacrylonitrile (AMP-PAN) Composites under Spent Fuel Recycling Conditions

et al. 2019

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“…Some of these, including the radioisotopes of Cs ( 134 Cs-t 1/2 = 2.1 y; 135 Cs-t 1/2 = 2.3 My; and 137 Cs; t 1/2 = 30.2 y) [3,4], are problematic to selectively isolate, and are environmentally mobile, [5][6][7] leading to concerns about their long-term storage and disposal. Of these, 137 Cs is of greatest concern as a strong gamma emitter, with a combined β-γ thermal output of ca 70 mW/g [8].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Gamma Irradiation on the Physiochemical Properties of Caesium-Selective Ammonium Phosphomolybdate–Polyacrylonitrile (AMP–PAN) Composites

et al. 2019

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Managing certain by-products of the nuclear fuel cycle, such as the radioactive isotopes of caesium: 134Cs, 135Cs and 137Cs is challenging due to their environmental mobility and radioactivity. While a great many materials can isolate Cs+ ions from neutral or basic aqueous solutions via ion exchange, few of these, with the exception of ammonium phosphomolybdate (AMP), function effectively in acidic media. The use of AMP, and its porous composite in polyacrylonitrile (PAN) for management of Cs radioisotopes in various nuclear wastes have been known for decades and are well studied, yet the effects of radiation on the physiochemical properties of such composites have only received limited attention to date. In a previous publication, we demonstrated that a 100 kGy gamma irradiation dose has negligible effect on the ion exchange performance of AMP and AMP–PAN with respect to capacity or kinetics under the Cs+ concentrations and acidity found in spent nuclear fuel (SNF) recycling. As a continuation of this prior study, in this publication we explore the effects of gamma irradiation on the physiochemical properties of AMP and AMP–PAN using a range of characterisation methods. The effects of the same gamma dose on the oxidation state of Mo in AMP and AMP–PAN, the thermal degradation of both AMP and AMP–PAN, combined with a first study into the high-temperature degradation AMP, are reported. The implications of irradiation, its possible mechanism, the conditions present in SNF recycling, and for the end-of-life disposal or recycling of these materials are also discussed.

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Synthesis and sorption properties of porous resorcinol–formaldehyde resins prepared by polymerization of the emulsion dispersion phase

et al. 2019

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Analysis and modeling of fixed bed sorption of cesium by AMP-PAN

Cited by 21 publications

References 36 publications

The Effect of Gamma Irradiation on the Ion Exchange Properties of Caesium-Selective Ammonium Phosphomolybdate-Polyacrylonitrile (AMP-PAN) Composites under Spent Fuel Recycling Conditions

The Effect of Gamma Irradiation on the Ion Exchange Properties of Caesium-Selective Ammonium Phosphomolybdate-Polyacrylonitrile (AMP-PAN) Composites under Spent Fuel Recycling Conditions

The Effect of Gamma Irradiation on the Physiochemical Properties of Caesium-Selective Ammonium Phosphomolybdate–Polyacrylonitrile (AMP–PAN) Composites

Synthesis and sorption properties of porous resorcinol–formaldehyde resins prepared by polymerization of the emulsion dispersion phase

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