Retention of barium and europium radionuclides from aqueous solutions on ash-based sorbents by application of radiochemical techniques

Noli, F.; Kapnisti, Maria; Buema, Gabriela; Harja, Maria

doi:10.1016/j.apradiso.2016.07.012

Cited by 23 publications

(12 citation statements)

References 30 publications

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“…The materials tested in this study were not among the highest available, such as Ti 3 C 2 T x Mxene [ 50 ], functionalized polymer (SASB-type) nanoparticles [ 70 ], phillipsite-chabazite-rich tuff [ 25 ] and synthetic zeolites [ 65 ]. However, comparably high uptake capacities for aqueous Ba 2+ by BEI and FeO-BEI were obtained, compared to, for example, dolomite [ 24 ], expended perlite [ 68 ], (hydrous) metal oxides [ 66 , 67 ], other clay minerals [ 19 , 20 ], nanoscale zero valent iron [ 42 ] and pecan shell-based activated carbon [ 71 ].…”

Section: Resultsmentioning

confidence: 99%

Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents

et al. 2020

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Efficient capture of barium (Ba) from solution is a serious task in environmental protection and remediation. Herein, the capacity and the mechanism of Ba adsorption by natural and iron(III) oxide (FeO) modified allophane (ALO), beidellite (BEI) and zeolite (ZEO) were investigated by considering the effects of contact time, temperature, pH, Ba2+ concentration, adsorbent dosage, the presence of competitive ions and adsorption–desorption cycles (regenerability). Physicochemical and mineralogical properties of the adsorbents were characterized by XRD, FTIR, SEM with EDX and N2 physisorption techniques. The Ba2+ adsorption fitted to a pseudo-first-order reaction kinetics, where equilibrium conditions were reached within <30 min. BEI, ALO and ZEO with(out) FeO-modification yielded removal efficiencies for Ba2+ of up to 99.9%, 97% and 22% at optimum pH (pH 7.5–8.0). Adsorption isotherms fitted to the Langmuir model, which revealed the highest adsorption capacities for BEI and FeO-BEI (44.8 mg/g and 38.6 mg/g at 313 K). Preferential ion uptake followed in the order: Ba2+ > K+ > Ca2+ >> Mg2+ for all adsorbents; however, BEI and FeO-BEI showed the highest selectivity for Ba2+ among all materials tested. Barium removal from solution was governed by physical adsorption besides ion exchange, intercalation, surface complexation and precipitation, depending mainly on the absorbent type and operational conditions. BEI and FeO-BEI showed a high regenerability (>70–80% desorption efficiency after 5 cycles) and could be considered as efficient sorbent materials for wastewater clean-up.

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Section: Resultsmentioning

confidence: 99%

Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents

et al. 2020

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“…The use of ash as an adsorbent for the retention of heavy metals is a widely studied field [16][17][18][19]. To increase the adsorption capacity, activation of the material surface by using acid or base chemical treatment is recommended.…”

Section: Introductionmentioning

confidence: 99%

“…The new materials obtained by modification have been continuously investigated in recent decades regarding the treatment of wastewater [8,17,20,[25][26][27][28]. The literature presents different adsorbents based on modified fly ash for cadmium adsorption [25].…”

Section: Introductionmentioning

confidence: 99%

Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

et al. 2020

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Wastes are the sustainable sources of raw materials for the synthesis of new adsorbent materials. This study has as objectives the advanced capitalization of fly ash, by sulphuric acid activation methods, and testing of synthesized materials for heavy metals removal. Based on the previous studies, the synthesis parameters were 1/3 s/L ratio, 80 °C temperature and 10% diluted sulphuric acid, which permitted the synthesis of an eco-friendly adsorbent. The prepared adsorbent was characterized through SEM, EDX, FTIR, XRD and BET methods. Adsorption studies were carried out for the removal of Cd2+ ions, recognized as ions dangerous for the environment. The effects of adsorbent dose, contact time and metal ion concentrations were studied. The data were tested in terms of Langmuir and Freundlich isotherm and it was found that the Langmuir isotherm fitted the adsorption with a maximum adsorption capacity of 28.09 mg/g. Kinetic data were evaluated with the pseudo-first-order model, the pseudo-second-order model and the intraparticle diffusion model. The kinetics of cadmium adsorption into eco-friendly material was described with the pseudo-second-order model, which indicated the chemisorption mechanism.

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“…The most used methods for heavy metal removal is adsorption, the adsorption process has been involved for treatment of contaminated water, because is a cheap and convenient method as compared with various techniques [4,[12][13][14]. So far, certain materials have been used to retain this type of pollutant using adsorption process: Layered double hydroxides (LDH) [15,16], Chitosan Coated Cobalt Ferrite [14]; Biochars produced from wheat straw pellets and rice husk [17]; Peat [18]; Adsorbents from fly ash [2,19]; Natural zeolite [20]; Natural, Sodium and Acid Modified Clinoptilolite-Rich Tuff [1]; Modified zeolite [21], sawdust [22].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Solid-Fluid non-catalytic Processes for Nickel Ion Removal

Buema¹,

Lupu²,

Chiriac³

et al. 2020

Rev. Chim.

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The aim of this study is modeling of the process of Ni(II) removal onto new materials synthesized by a facile coprecipitation method. The literature presents different surfactants intercalated on MgAl-LDH with applicability for nickel ions removal, but the researches on the use of this material ��as cast�� as adsorbent for Ni(II) ions are limited, it is reason to develop this study. The morphology, chemical composition, and the basic structure of the new material were analyzed by SEM, EDAX, BET, XRD and FT-IR. The kinetic modeling was performed using the pseudo-first-order, four-type linear pseudo-second-order, and intraparticle diffusion. The experimental data demonstrated that the adsorption process is very fast in the first 20 minutes and reach equilibrium after 50 min. The maximum adsorption capacities of the adsorbent are in the range of 36.5-68.18 mg/g, for the 200-500 mg/L initial solution concentration.

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Retention of barium and europium radionuclides from aqueous solutions on ash-based sorbents by application of radiochemical techniques

Cited by 23 publications

References 30 publications

Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents

Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents

Eco-Friendly Materials Obtained by Fly Ash Sulphuric Activation for Cadmium Ions Removal

Modeling of Solid-Fluid non-catalytic Processes for Nickel Ion Removal

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