Sorption Of Manganese Research Articles

Combined extraction of manganese during water purification of technogenic solutions

A method for demanganization of technogenic aqueous solutions is presented. This method involves electrocoagulation purification of aqueous systems from high metal contents and extraction of manganese (II) ions by carbon sorbent adsorption. A coagulation technology based on electrogenerated aluminum hydroxide was used. According to diffraction analysis, such a hydroxide exhibits an amorphous porous hydrogel structure with a developed sorbing surface. The micellar structure of the as-generated aluminum hydroxide, which was attributed to a modification of gibbsite, is represented by the following colloidal particle: {[m Al(OH)3] nAl(OH)2+ (n-x) OH-}x+ xOH-. The associative process of sorption on gibbsite occurs by dispersion interaction, which is governed by the force of electrostatic attraction of instantaneous and induced dipoles of electrically neutral sorbent molecules and the [Mn (OH2)2(OH)2]0 manganese hydroxo-aquo complex. The adsorption limiting value of manganese ions amounted to 4.9 mmol/g at 298 K and pH 5.8, with the adsorption equilibrium constant reaching 1.36 . 104. The electricity consumption corresponded to 12.0 А.h at an optimal electrocoagulation duration of 15 min and a current density of 1.6 мА/сm2. The final purification of aqueous solutions using carbon sorbents was conducted in a slightly alkaline medium at pH 7.5. The manganese sorption value reached 1.68 mmol/g. Therefore, the resource-saving effect of processing of technogenic hydro-mineral solution is manifested in a significant reduction of heavy metal salts and in obtaining of demanded mixed coagulants of aluminum and iron sulfates from water purification wastes. Another positive effect of electrochemical water purification consist in water disinfection and its improved ogranoleptic parameters.

Effect of the type of ion-exchange resin on Mn<sup>2+</sup> adsorption in the presence of competing cations

Present in soils, ground and surface waters, manganese is among the most common metals in Earth crust. It is also an essential trace element to the functioning of several enzymes in the human body. However, exposure to high manganese concentrations can also be harmful to humans with psychiatric and motor effects and therefore, manganese concentrations in drinking water and also industrial effluents are regulated. In the current work, the adsorption of Ca<sup>2+</sup>, Mg<sup>2+</sup> and Mn<sup>2+</sup> on three different ion-exchange resins: (i) aminophosphonic acid - chelating (Purolite S950), (ii) polyacrylic weak acid cation (Purolite C104E) and (iii) polystyrene strong acid cation (Purolite C100) was investigated. The results revealed that Purolite S950 had the highest Mn2+ uptake (37.9 mg/mL-resin or 0.69 mmol/mL-resin) as compared to Ca<sup>2+</sup> (3.2 mg/mL-resin or 0.08 mmol/mL-resin) and Mg<sup>2+</sup> (~0 mg/mL-resin) and was selected for further kinetics and equilibrium studies. The results indicated Purolite S950 as particularly suited to be applied in the treatment of neutral mine waters with high Mg/Mn ratios. Additionally, Purolite S950 showed a small affinity for Ca<sup>2+</sup> and therefore an efficient Mn<sup>2+</sup> removal will depend on the Ca/Mn ratio of the mine water under treatment. According to the kinetic analysis, manganese sorption on Purolite S950 was described by the pseudo-second order model (r<sup>2</sup> > 0.98) with an activation energy of 10.40 kJ/mol and thus pore-difussion was the rate controlling step of the process. In terms of equilibrium studies, manganese sorption on Purolite S950 followed the Langmuir model with maximum loadings of up to 41.5 mg/mL-resin. The thermodynamic modelling indicated an exothermic process (-85.0 kJ/mol, as standard enthalpy) with a standard entropy of -274 J/mol.K, which was ascribed to the release of two adsorbed H<sup>+</sup> ions for each Mn<sup>2+</sup> ion taken up from solution

Enhancing manganese sorption: Batch and fixed-bed column studies on activated zeolite

Dissolved Mn2+ in groundwater is dangerous for human health since it may act as a neurotoxin. To address this issue, sorption has emerged as an environmentally-friendly technology for Mn2+ removal. This study aimed to assess the effect of activation of Chilean natural zeolite, by modification of its compensating cations with NaCl, on its capacity for Mn2+ removal using batch and fixed-bed column studies. The natural and activated zeolites were characterized by SEM-EDS, TXRF, XRD, and N2 adsorption assays. The results of batch studies demonstrate that Na+ enhances the Mn2+ removal capacity of these zeolites from 4.55 to 5.9−1, with negligible changes in the pore structure. The experimental data fitted well with the pseudo-second-order kinetic and Langmuir adsorption models. Furthermore, MnOx(s) formed during the Mn2+ removal was identified on the surface of the zeolite by XRD and SEM-EDS analysis. The fixed-bed column studies were conducted at two bed heights: H1 (5 cm) and H2 (10 cm). The breakthrough curves adjusted to models of Thomas and Dose-response. The dose-response model adequately described both experimental data with an R2 > 0.90. The Mn2+ adsorption capacity of the system (qmdr) was 2.38 and 5.13 mg g−1, for H1 and H2, respectively. The regeneration of the activated zeolite was achieved using NaCl solution improving the efficiency of Mn2+ removal after reuse. This work highlights natural zeolite potential as an effective material for Mn2+ removal and as a viable technology to improve the water quality affected by geogenic contamination.

Ferric Iron, Manganese Sorption from Waste Water by Commercial Activated Bentonite clay as Low Cost Adsorbents

Ferric Iron, Manganese Sorption from Waste Water by Commercial Activated Bentonite clay as Low Cost Adsorbents

Modeling of competitive sorption of uranium by the BO020 anion-exchange resin

The aim of this report is to focus on competitive sorption of strongly basic anion-exchange resin (BO020) in model solutions similar to on-site sulfuric acid solutions obtained by leaching the Uch-Kuduk deposit ores. The BO020 resin was applied to a modeling study of the uranium and competitive ions sorption in sulfuric acid solutions at pH = 1.2 and a concentration of 7 g/l of sulfate ions. The chemical composition of the salt solution after sulfuric acid ore leaching was as follows: U6+ - 0.1-0.5 g/L; Fe3+ - 0.07-0.7 g/L , Fe2+ - 0.07- 0.7 g/L; SO42- - 7.0 - 13.0 g/L; P5+ - 0.08-0.2 g/L; Cl- - 0.15 - 0.3 g/L; Si4+ – 0.085 - 0.3 g/L; Al3+ - 0.01 - 0.164 g/L, Ca2+ - 0.5 - 0.7 g/L. The BO020 resin has fairly high uranium uptake and sorption capacities, but phosphorus, iron, aluminum, and manganese sorption capacities are very small. The nitrate and chloride ions have high sorption capacities only at high concentrations in solution. The results can be used to make the best choice of ion exchanger application for underground leaching of uranium.

Physicochemical Patterns of the Sorption of Manganese(II) Ions by Apple Pectin Modified with Organic Pharmacophores

Physicochemical Patterns of the Sorption of Manganese(II) Ions by Apple Pectin Modified with Organic Pharmacophores

Mn(II) Sorption on Stream Sediments Sampled in Manganese Mining Area: Dynamics and Mechanisms

The stream sediments that have been impacted by manganese (Mn) containing wastewater for decades contain not only abundant microorganisms but also organic/inorganic substances. To achieve effective treatment of manganese (Mn)-containing effluent and recovery of Mn from water/sediments, the Mn(II) sorption behaviors and mechanism on sediments of a stream in Mn mining areas were studied. In addition, the study analyzed the effects of various factors (initial concentration, solution pH, sediment dose, contact time, and coexisting cations) on the Mn sorption efficiency of Daxin sediments, and explored the contribution of microbial activity in the sediment sorption of Mn(II). The results showed that the sorption process of Mn(II) on the sediments was consistent with the Elovich and Freundlich models, and the removal of heavy metals was maximum at 40 °C (62.47–98.93%), pH = 8 (77.51%), initial concentration of 1 mmol·L−1 (95.37%) and sediment dosing of 12 g·L−1 (98.93%). The addition of 50 mM NaN3 inhibited the microbial activity in the Daxin sediment, reducing the sorption and removal rates of Mn(II) by 0.605 mg·g−1 and 8.92%, respectively. After sorption, the proportion of the Fe–Mn oxidation(iron–manganese) state in Daxin sediments decreased from 54% to 43%, while the proportion of the exchangeable state increased by 10.80%. Microorganisms in the sediment had a positive effect on inhibiting heavy metal migration and reducing the bioavailability of contaminants in the soil. Through this study, we hope to further understand the sorption and desorption mechanism of manganese by stream sediments in manganese ore areas, so as to provide a guide on the management and recovery of Mn from stream sediments in manganese mining areas.

SORPTION OF MANGANESE (II) AND VANADIUM (IV) CATIONS BY TAGAN BENTONITE IN AN AQUEOUS MEDIUM

The process of sorption of Mn2 + and V4 + cations by bentonite of the Taganskoye deposit studied depending depending on various factors (T, oC; τ, min; S: L ratio; CMn and CV, mg / l). It was found that bentonite exhibits sorption properties with respect to the studied cations in a wide range of pH values ​​(from 1 to 10). The highest degree of their sorption is achieved at the consumption of bentonite 1.5 g per 100 wt. h. metal-containing solution. The influence of the nature of the cation on the sorption capacity of Tagan bentonite was established. The most intense increase in the degree of sorption of manganese (II) occurs in 15 min with an increase in temperature to 35оС. The highest degree of sorption of V4 + cations is achieved in 60 min at 25 ° C in weakly concentrated vanadium-containing solutions (50 mg / L V4 +). Bentonite from the Tagan deposit exhibits a lower sorption capacity with respect to V4 + cations as compared to Mn2 + cations, which is due to the nature of the cation.

Determination of best-fit isotherm model for the sorption of Lead (II) and Manganese (II) ions onto acid-activated shale using selected non-linear error functions

The focus of this research is to apply the selected error function equation to establish the equilibrium isotherm model that best describes the adsorption of Pb2+ and Mn2+ onto acid-activated shale. Data collected from the batch experiment were analyzed using selected isotherm models (Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Sips and Redlich-Peterson). To compute the isotherm parameters used in choosing the best-fit isotherm model, selected non-linear error functions, namely, error sum of the square, normalized standard deviation, hybrid error function, root mean square error and Marquardt’s percent standard deviation were employed. From the scanning electron microscope results, it was observed that the surface characteristics of the shale change considerably with calcination and acid treatment but the acid-treated shale shows better uneven porous surface characteristics. Error function computation shows that the Dubinin-Radushkevich isotherm model had the least sum of normalized error of 0.3623 for Pb2+ adsorption and 0.5465 for Mn2+ adsorption; hence, it was selected as the best isotherm model for explaining the sorption of Pb(II) and Mn(II) ions unto acid-activated shale.

Thermodynamic Studies on the Sorption of Lead (II), Chromium (III) and Manganese (II) ions onto Acid-Activated Shale

Shale mineral in its raw form was collected, processed, calcinated and activated using tetraoxosulphate (VI) acid. The microstructural arrangement and chemical composition of the raw, calcinated and acid-activated shale was determined using x-ray fluorescence and scanning electron microscope to verify its ability for the removal of Pb2+, Cr3+ and Mn2+ from wastewater. Batch experimental method was used to study the effect of different adsorption parameters on the sorption efficiency of shale. The effect of temperature on the sorption of Pb2+, Cr3+ and Mn2+ on acid-activated shale was investigated at varied temperature of 15 – 40 . The calculated value of enthalpy () was 12.50 kJ/mol for Pb2+ adsorption, 5 kJ/mol for Cr3+ and 11 kJ/mol for Mn2+ adsorption. The calculated values of Gibbs free energy () varies from -6.576 kJ/mol to 1.358 kJ/mol for Pb2+ adsorptions, from -2.696 kJ/mol to 0.192 kJ/mol for Cr3+ adsorptions, and -4.994 kJ/mol to 1.870 kJ/mol for Mn2+ adsorptions. The entropy () range is 38.68 – 60.946 kJ/mol for Pb2+ adsorptions, 16.69 – 24.58 kJ/mol for Cr3+ adsorptions, and 31.70 – 51.10 kJ/mol for Mn2+ adsorptions. The positive value of shows that the adsorption of Pb2+, Cr3+ and Mn2+ onto acid-activated shale was an endothermic process. The values of are negative at temperature of 298 K and above for the three metal ions studied, which confirmed that the adsorption of Pb2+, Cr3+ and Mn2+ on acid-activated shale was a spontaneous process. The decline in with increasing adsorption temperature showed that adsorptions of Pb2+, Cr3+ and Mn2+ onto acid-activated shale became better at higher temperature while the positive value of for all metal ions studied showed the amplified arbitrariness at the solid-solution interface during the fixation of the adsorbate on the active site of acid-activated shale.

The Kinetics of Manganese Sorption on Ukrainian Tuff and Basalt—Order and Diffusion Models Analysis

The study aimed to determine the nature of the kinetics of the manganese sorption process on Ukrainian tuff and basalt at different temperatures characteristic of the natural water environment. The scope of the research included manganese sorption kinetic test on natural mineral sorbents at temperatures of 10, 17.5 and 25 °C in slightly acidic conditions. Sorption (pseudo-first order, pseudo-second order and Elovich models) and diffusion kinetic models (liquid film diffusion and intraparticle diffusion) were used in the analysis of test results. The manganese sorption process on both tuff and basalt proceeded quickly. The dynamic equilibrium state of manganese sorption settled after 35 and 45 min on tuff and basalt respectively. Although the process took place in a slightly acidic environment and below pHPZC of the sorbents, possible electrostatic repulsion did not inhibit the removal of Mn. The Mn sorption on both materials followed the PSO kinetics model. Based on the diffusion kinetic models, it was determined that Mn sorption process on both materials was influenced by diffusion through the boundary layer and intraparticle diffusion. The differences in removal efficiency and rate of Mn sorption in the temperature range of 10–25 °C were not found.

SORPTION OF MANGANESE AS A COMPLEX WITH CARMOISINE ON ANIONITE AV-17-8 IN DYNAMIC MODE

In current paper, the kinetic features of manganese adsorption from dilute aqueous solutions in a dynamic mode were studied. Using dynamic and kinetic curves that take into account the change in the rate coefficient of the sorption process versus its duration, the mechanism of the formation of adsorption layers in the sorption column during the sorption of manganese(II) products which formed after coresponding redox-reaction by surface of the organopolymer anion exchanger AV-17-8 in dynamic mode. Azo dye carmoazine, which is a selective reagent for manganese(VII), was used for its preliminary binding to a strong complex prior to sorption removal. The main process that determines the adsorption interaction in the studied system is the electrostatic attraction of the anionic complex to the positively charged surface of the anionite and the formation of a strong monolayer. The additional fixation of complex is due to the hydrophobic interactions between its molecules and the phenyl radicals of the AV-17-8 matrix. Based on the calculated mass transfer coefficients of the sorption process and the corresponding sorption isotherm, the optimal conditions for the removal of the complex are established, namely: the volumetric rate of transmission of the sorbate through the sorption column is at least - 8 cm3/min; column diameter - 10.0 mm; the minimum weight of the sorbent is 0.5 g; the diameter of the ionite grains is 0.43 ÷ 0.50 mm. Based on the complex of the experimental results obtained and their interpretation, taking into account the known provisions, a mechanism of sorption in the dynamic mode and the formation of adsorption layers in the studied system was proposed. The data obtained can then be used to develop a test system in the form of an indicator tubes and as well as for quantitative sorption-spectroscopic determination of Manganese in various categories of waters via corresponding colorimetric scales.

Sorption of nickel (II) and manganese (II) ions from aqueous solutions

Mine water from non-ferrous metal deposits is often contaminated with nickel and manganese ions. The entry of these ions, especially nickel, into surface waters and underground aquifers is undesirable since it has a negative effect on living organisms and worsens the condition of drinking water sources. One of the promising methods for selectively extracting nickel ions and obtaining an eluate suitable for further use is sorption by weakly acid cation exchangers with chelate groups of iminodiacetic acid.
 As part of the study, sorption isotherms of nickel and manganese ions by Lewatit MonoPlus TP 207 cation exchanger in mono- and bicomponent systems were obtained. In monocomponent systems, the maximum static exchange capacity (SEC) of the cation exchanger for nickel ions is 952 mmol/dm3, and in bicomponent systems – 741 mmol/dm3; for manganese ions– 71 mmol/dm3 and 49 mmol/dm3, respectively. It is obvious that the studied cation exchanger has a greater capacity for nickel ions than for manganese ions.
 The influence of a temperature increase from 300 to 330 K on the sorption of nickel and manganese ions was established: in monocomponent systems, the maximum degree of extraction of the former increases from 65 to 77 % (SEC from 337 to 399 mmol/dm3), and the latter from 21 to 35 % (SEC – from 140 to 229 mmol/dm3); in bicomponent systems, the extraction of nickel ions increases from 59 to 78 % (SEC – from 307 to 429 mmol/dm3), and manganese ions decreases from 20 to 17 % (SEC – from 164 to 131 mmol/dm3). The predominant increase in the indicators is due to the filling of the sorption centers of the ion-exchange resins, which are energetically unfavorable for the exchange of counterions at a lower temperature.
 The influence of the pH of the solution on sorption was determined: the intensification of the process for nickel ions is observed in the pH range of 8.0-8.5 in a monocomponent solution and 8.0-9.0 in a bicomponent solution, for manganese ions in the range of 8.0-9.5 in both cases. The increase in the degree of extraction of ions and the exchange capacity of the ion exchanger with increasing pH is associated with the appearance of singly charged hydroxocations, dissociation of the functional groups of the sorbent and, to some extent, with the subsequent formation of insoluble forms of nickel and manganese. However, with increasing pH, a decrease in the selectivity of nickel extraction is observed: the ion separation coefficient decreases from 14.0 to 6.0 in the pH range of 6.0-11.0.

Study of Sorption of Manganese (II) Cations by Composite Sorbent

A significant increase in the amount of pollution (including heavy metals) that enter the hydrosphere as a result of human activity, sanitary requirements that are imposed on the quality of water, lead to the search for effective ways and methods of its purification. Wastewater from many industrial plants contain heavy metal salts, including manganese compounds. The sorption of manganese (II) cations by a composite sorbent from model solutions under static conditions was studied, to determine the possibility of using this sorption material in wastewater treatment. The characteristics of the sorption capacity of the composite sorbent are determined. It was established that the static exchange capacity of the composite sorbent is 0.9 mg/g; distribution coefficient - 47.34 l/g; the degree of purification of the solution is 99.9%. The empirical sorption equations for the manganese (II) cation are found, the sorption isotherms are constructed. It is established that the sorption process is described by the Freundlich equation. Experiments have shown that the composite sorbent is effective in extracting manganese (II) from aqueous solutions. Experimental data suggest that the sorbent studied can be used to clean industrial wastewater from manganese compounds.

Results of Research into the Content of Rare Earth Materials in Man-Made Phosphogypsum Deposits

According to the materials of the Rivne exploration expedition in Rivne region more than 15.3 million tons of phosphogypsum materials in rock dumps are stored. For further use and recycling of waste, it is necessary to evaluate the content of rare earth elements in phosphogypsum, which are of considerable economic value. The possible recycling of this production will increase the level of environmental safety through the use of more reliable engineering systems for the environmentally safe storage of phosphogypsum rock dumps. The migration of phosphorus, fluorine, sulfur, copper, chromium, manganese, zinc, lead, cadmium, iron, nickel and cobalt along the profile of the artificial ground cross-section was investigated experimentally. The results of studies confirmed the increased accumulation of metal in the phosphogypsum rock dumps. Analyzing the content of nickel, lead, sulfur, manganese, cobalt and zinc in experimental samples, we observe the distribution pattern, the content of which in samples is 2 – 3 times higher than the content of trace elements of the above-mentioned groundwater deposits. The results of the sorption and desorption of nickel, lead, sulfur, manganese, cobalt and zinc indicate that the rock is not an obstacle to the migration of trace elements and its aggregates in the rock and is observed only in the zone of full water saturation due to the filling of pore space. The conducted researches established the presence of phosphogypsum in man-made wastes of nickel, lead, cobalt, zinc, iron with a percentage content up to 1% per ton of rock waste.

Sorption of Metal Cations by Lignite and Humic Acids

The possibility of using readily available materials—Tyul’gansk lignite, Tisul’sk lignite (and its naturally oxidized form), humic acids, and coal residues after humic-acid extraction—in the sorption of copper, cobalt, manganese, and zinc cations from aqueous solutions is considered. Their effectiveness as sorbents is assessed by means of IR Fourier spectroscopy, ESR, Raman scattering, and CP/MAS 13C NMR analysis. The sorptional properties of humic acids are changed on modification by means of hydrogen peroxide and n-butanol, which alter their functional composition. Oxidation by hydrogen peroxide improves the sorptional properties, while alkylation with butanol impairs those properties. The sorbents are most selective for copper cations and least selective for manganese cations.

Adsorption and Desorption Study of Locally Available BOF Sludge to Remove Metal Ions from Aqueous Solutions

Coarse BOF sludge is a waste originating from steelmaking production. The major phaseof this waste is zinc ferrite. BOF sludge for this study was obtained from the metallurgical industryfrom a process of gas treatment in an oxygen converter. The sorption of cobalt, manganese and nickelions was investigated in the sample of the deposited sludge in a batch of experiments. The sorptionprocess was evaluated using three types of isotherm models. The sludge sample was alkaline andconsisted primarily of X-ray amorphous compounds and crystalline Fe oxides. The adsorptionprocess showed that a high removal efficiency was achieved at a lower initial concentration of metalions. Moreover, the equilibrium of the sorption process was achieved after 72 hours. Subsequently,the desorption of these adsorbed ions was investigated. The results of this study indicate that theapplication of metallurgical waste as a sorbent is highly effective for the treatment of wastewater.

Passive Remediation of Acid Mine Drainage Using Ball-Milling Modified Indonesian Natural Bentonite: Laboratory Batch and Column Sorption of Manganese

Manganese (Mn) is an essential element for human body. However, elevated concentration of manganese causes severe problem and disease. Acid mine drainage (AMD), wastewater generated due to open-pit mining, commonly contains Mn with exceeded concentration. This study is to investigate the improvement of ball-milling modified Indonesian natural bentonite (INB) for manganese (Mn) removal from AMD and to increase the pH through batch and column sorption test as a passive treatment system approach. The batch sorption test result showed the maximum Mn adsorbed (Qm) on INB from the Langmuir model increased from 4.69 to 17.12 mg/g after milling. The column sorption test result also showed the amount of Mn adsorbed on INB until breakthrough time (qu) and until saturation time (q) increased after milling. The qu increased from 1.27 to 10.06 mg/g, and the q increased from 4.55 to 12.91 mg/g. The mass transfer zone (MTZ) became significantly shorter after milling from 0.22 to 0.07 cm. The Thomas model exhibited the equilibrium uptake of Mn (q0) increased after milling from 3.91 to 13.72 mg/g. In equilibrium condition, both unmilled and milled INB showed the pH increased from ≈3 to 8.

CARACTERIZAÇÃO TECNOLÓGICA DE UMA ZEÓLITA EXAURIDA, PARA REMOÇÃO DE ÍONS Mn2+

As zeólitas apresentam importante propriedades fisico-químicas que aliadas a sua disponibilidade e seu baixo custo viabilizam sua aplicação em vários processos industriais. Atualmente tem-se dado enfoque para utilização de zeólitas na adsorção de metais no tratamento de água e de efluentes industriais. Assim, o presente trabalho teve como objetivo a caracterização tecnológica de uma zeólita, visando atestar a viabilidade de sua utilização na remoção de íons Mn2+(aq) em diferentes condições experimentais. O material utilizado neste trabalho era uma zeólita sintética exaurida utilizada como catalisador no craqueamento de petróleo. Inicialmente, realizou-se a ativação da zeólita com solução de NaOH, 1 mol.L-1. Em seguida, foi feita a caracterização da mesma e sua aplicação nos ensaios de adsorção com solução sintética de Mn2+ a 50 mg.L-1, realizados em batelada. Foram investigados valores de pH entre 4 e 8, e temperatura entre 25°C e 70°C. Observou-se que a zeólita foi identificada, por difração de raios-X, como Faujasita. O pH ótimo de adsorção sem risco de remoção por precipitação foi de 6,5 e a melhor temperatura, 25°C. O tempo de equilíbrio da adsorção do Mn2+(aq) por adsorção foi de 4 horas. Nessas condições, obteve-se um carregamento de 10,8 mg Mn2+-g zeólita. Os resultados mostraram o potencial de aplicação deste material para processos de remoção de íons manganês presentes em soluções aquosas

Evaluation of Mn bioaccumulation and biosorption by bacteria isolated from spent nuclear fuel pools using54Mn as a radioindicator

AbstractBioaccumulation and biosorption characteristics of Mn2+ions by both dead and living, non-growing biomass of Gram-positive bacteriaKocuria palustrisandMicrococcus luteusisolated from spent nuclear fuel pools were compared. The radioindicator method using radionuclide54Mn was applied to obtain precise and reliable data characterizing both processes as well as manganese distribution in bacterial cells. Manganese was mainly found on the surface (biosorption) of live cells of both bacteria and surface sorption capacity increased with Mn concentration in solution. Only 10.0% (M. luteus) and 6.3% (K. palustris) of uptaken Mn were localized in the cytoplasm (bioaccumulation). Biosorption of Mn by dead bacterial biomass was a rapid process strongly affected by solution pH. Maximum sorption capacitiesQmaxcalculated from the Langmuir isotherm and characterizing Mn binding represented 316±15 μmol/g forM. luteusand 282±16 μmol/g forK. palustris.Results indicate that living, non-growing cells showed a higher efficiency of Mn removal than dead biomass. Based on FTIR spectra examination with aim to characterize the surface ofK. palustrisandM. luteuscells, we confirmed that the phosphate and carboxyl functional groups are involved in manganese sorption onto cell surface by both live and dead bacterial biomass.