Sorption and desorption of pertechnetate on biochar under static batch and dynamic conditions

Rajec, P.; Rosskopfová, O.; Galamboš, Michal; Frišták, Vladimír; Soja, Gerhard; Dafnomili, Argyro; Noli, F.; Đukić, Anđelka; Matović, Lj.

doi:10.1007/s10967-016-4811-8

Cited by 30 publications

(9 citation statements)

References 19 publications

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“…Technetium occurs in various oxidation states based on the environmental redox condition. The pertechnetate anion TcO 4 − , oxidation state VII+ is the most common chemical form of technetium, mainly in liquid nuclear wastes and the environment [ 1 , 3 ]. Chemical and physical properties of technetium are common with rhenium.…”

Section: Introductionmentioning

confidence: 99%

“…However, most of the traditionally produced have limited ability to sorb anionic species. Recently a new concept, engineered biochar has gained interest, in which engineered biochar is prepared by biochar surface impregnation with montmorillonite or other clay minerals [ 3 , 17 , 18 , 19 , 20 ]. Therefore, technetium in the most environmentally stable form—pertechnetate is sorbed, while others, mostly metals flow through this material if pH is smaller than approx.…”

Section: Introductionmentioning

confidence: 99%

“…This is particularly advantageous for large sample volumes circulating through a column packed with these kinds of materials [ 1 , 20 ]. Additionally, application of engineered biochar as a low cost and more environmentally friendly method in environmental applications compared to conventional technologies [such as precipitation, filtration or coagulation represent a future step firstly, in assessment and recycling of waste materials in 21st century, secondly for technetium separation application [ 2 , 3 , 17 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Surface Complexation Models of Pertechnetate on Biochar/Montmorillonite Composite—Batch and Dynamic Sorption Study

et al. 2020

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The study summarizes the results of monitoring the properties of two types of sorbents, BC1 (biochar sample 1) and BC2a (biochar sample 2), prepared by pyrolysis of bamboo biomass (BC1) and as its composite with montmorillonite K10 (BC2a). The main goal was to study their applicability to the Tc (VII) separation from liquid wastes, using NH4ReO4 as a carrier. The research was focused on determining the sorbents surface properties (by XRF (X-ray fluorescence) method and potentiometric titration in order to determine the properties of surface groups—Chemical Equilibrium Model (CEM) and Ion Exchange Model (IExM) models were applied here). As well as monitoring Tc (VII) (+Re(VII)) sorption, especially to determine equilibrium isotherm, the influence of pH and kinetics. The subject of research was also the dynamics of sorption, including its mathematical–physical modeling. Both sorbents have good properties against Tc (VII), however BC2a, due to the presence of montmorillonite, is more advantageous in this respect. It has a higher sorption capacity and faster kinetic investigation. An important finding is that the optimal pH is 2–3, which is related not only to the protonation of surface groups (they have a positive charge), but also to the negative form of the existence of Tc (VII) and Re (VII): TcO4− and ReO4−.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface Complexation Models of Pertechnetate on Biochar/Montmorillonite Composite—Batch and Dynamic Sorption Study

et al. 2020

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“…Biochar as a carbon-rich material produced at 350-700°C under strict anoxic conditions from various feedstocks such as wood waste, straw, corn cobs represents important tool in sorption and immobilization studies of several heavy metals, metalloids, and radionuclides (Frišták et al, 2017;Jang et al, 2018;Rajec et al, 2016;Sizmur, Fresno, Akgül, Frost, & Moreno-Jiménez, 2017). Process of slow, fast, or flash pyrolysis treatment provides an important technological step in waste assessment and thus progress in environmental management.…”

Section: Introductionmentioning

confidence: 99%

Potassium nickel(II) hexacyanoferrate(III)-functionalized biochar for selective separation of radiocesium from liquid wastes

Pipíška

Ballová

Frišták

et al. 2020

Journal of Radiation Research and Applied Sciences

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Biochar is a promising metal-immobilizing material, nevertheless the studies of its modification and application in the removal of radionuclides, especially 137 Cs from contaminated liquids remain rare. This research demonstrated that horticultural waste derived biochar (GWB) produced by slow pyrolysis process could be a suitable Cs adsorbent and also useful support to impregnate the potassium nickel(II) hexacyanoferrate(III) (KNi-HCF). Porous materials combining sorption properties of biochar carrier and KNi-HCF have been prepared using simple and efficient impregnation method. The obtained materials (GWB, KNi-HCF-GWB1, and KNi-HCF-GWB2) have been characterized using N 2 adsorption method, SEM-EDX, and FTIR analysis. Compared to GWB, both KNi-HCF biochars showed improved adsorption properties toward Cs + ions, e.g. rapid kinetics, high Cs adsorption capacities (140 ± 3 μmol g −1 for KNi-HCF-GWB1 and 290 ± 9 μmol g −1 for KNi-HCF-GWB2), and high K d values even in the presence of excess of monovalent (Na + + K + + NH 4 + ) and divalent (Ca 2+ + Mg 2+ + Sr 2+ ) cations. High adsorption capacities could be related to synergistic effects of Cs + ion-exchange with KNi[Fe(CN) 6 ] structure and other mechanisms described for unmodified GWB. Rapid adsorption kinetics and high Cs adsorption capacity indicate the suitability of KNi-HCF biochars to treat large volumes of 137 Cs contaminated liquids.

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“…Most adsorbents towards TcO 4 À and ReO 4 À depended on ion-exchange. MOFs, [11][12][13][14] carbon materials, [15][16][17][18] and organic adsorbents have been employed as the adsorbents. Organic adsorbents including resins, 19,20 graed materials 21,22 and gels 23,24 take the advantage of high adsorption capacities and easy design and synthesis.…”

Section: Introductionmentioning

confidence: 99%

Polymeric ionic liquid gels composed of hydrophilic and hydrophobic units for high adsorption selectivity of perrhenate

Han

Cui

et al. 2018

RSC Adv.

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Sorption and desorption of pertechnetate on biochar under static batch and dynamic conditions

Cited by 30 publications

References 19 publications

Surface Complexation Models of Pertechnetate on Biochar/Montmorillonite Composite—Batch and Dynamic Sorption Study

Surface Complexation Models of Pertechnetate on Biochar/Montmorillonite Composite—Batch and Dynamic Sorption Study

Potassium nickel(II) hexacyanoferrate(III)-functionalized biochar for selective separation of radiocesium from liquid wastes

Polymeric ionic liquid gels composed of hydrophilic and hydrophobic units for high adsorption selectivity of perrhenate

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