Sorption Parameters Research Articles

Reduction and Biosorption of Cr(VI) from Aqueous Solutions by Acid-Modified Guava Seeds: Kinetic and Equilibrium Studies

Abstract The use of guava seeds (GS) and acid-modified guava seeds (MGS) for the removal of Cr(VI) from aqueous solutions was investigated. Batch-type experiments were performed with Cr(VI) aqueous solutions and biosorbents to determine the kinetic and equilibrium sorption parameters. Results indicated that GS and MGS were capable of reducing and remove Cr(VI) from solutions, but the reduction was only observed at some experimental conditions. Infrared analysis showed that several functional groups were involved in the reduction, and biosorption of Cr(VI), particularly alcohol, phenolic, carboxylic, and methoxymethyl structures. The mechanisms of reduction and biosorption depended upon the type of biosorbent, pH, and temperature of the system. The pseudo-second-order kinetic model describes the kinetic sorption data, and the Langmuir-Freundlich (L-F) model describes the isotherm data in most cases. Significantly high total chromium biosorption capacities were obtained. Acid modification of guava seeds improves chromium biosorption performance.

A Methodology to Estimate the Sorption Parameters from Batch and Column Tests: The Case Study of Methylene Blue Sorption onto Banana Peels

In the present work, a methodology is presented where batch and fixed-bed column tests of dye sorption onto granular biosorbents are analyzed with properly selected models to estimate the parameters required for the rational design of pilot-scale units. The sorption of methylene blue (MB) onto banana peels (BP) was investigated as a case study. To identify the mechanisms of MB sorption onto BP, the pore structure and surface of BP were characterized with mercury intrusion porosimetry (MIP), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Batch tests were performed over the temperature range of 15–45 °C, and three models (Langmuir, Freundlich, Langmuir–Freundlich) were fitted to equilibrium and kinetic data for (i) estimating thermodynamic/kinetic parameters and (ii) choosing the model with the best goodness-of-fit. Sorption tests on fixed-bed columns were combined with a one-dimensional macroscopic convection/dispersion/sorption model to estimate the sorption parameters of BP beds. MB sorption onto BP was a purely exothermic (ΔH0~−20 kJ/mol), reversible, and monolayer chemisorption with high activation energy for the desorption step (Ed~29 kJ/mol) and low activation energy for the adsorption step (Ea~9 kJ/mol). The Langmuir isotherm (KL = 141.9 m3/kg, T = 25 °C) and Langmuir kinetic model (kd = 1.05 × 10−5 s−1) provided the best fitting to equilibrium and transient data of batch tests. The sorption capacity ~0.15–0.22 kg/kg and kinetic constant 0.3 × 10−5 s−1–4.0 × 10−5 s−1 estimated from tests on BP beds were comparable to those obtained from batch tests.

Sorption and biodegradation parameters of selected pharmaceuticals in laboratory column experiments

Pharmaceutically active compounds have increasingly been detected in groundwater worldwide. Despite constituting a risk for human health and ecosystems, their fate in the environment has still not been exhaustively investigated. This study characterizes the transport behavior of five selected pharmaceutically active compounds (antipyrine, atenolol, caffeine, carbamazepine and sulfamethoxazole) in two sediments (coarse quartz sand and sandy loam) using column experiments with long-term injection of spiked groundwater. Transport parameters were estimated using an analytical reactive transport model. When five selected compounds were injected simultaneously, transport behavior of antipyrine, carbamazepine and the antibiotic sulfamethoxazole were similar to the conservative tracer in both sediments and under varying redox conditions. Atenolol and caffeine were retarded significantly stronger in the sandy loam sediment than in the coarse quartz sand. Biodegradation of caffeine was observed in both sediments after an adaption period and depended on dissolved oxygen. The identification of biodegradation processes was supported by monitoring of intracellular adenosine triphosphate (ATPitc) as a measure for microbial activity. ATPitc was present in varying concentrations in all sediments and was highest when biodegradation of pharmaceuticals, especially caffeine, was observed. When only caffeine and sulfamethoxazole were injected simultaneously, sulfamethoxazole was degraded while caffeine degradation was reduced. The latter seemed to be influenced by low concentrations in dissolved oxygen rather than the presence of the antibiotic sulfamethoxazole. Results of these experiments emphasize the impact on pharmaceutical sorption and (bio)degradation of sediment type and redox conditions, as well as available time for microbial adaption and the combination of pharmaceuticals that are released together into groundwater.

Removal of Hg (II) metal ions from environmenta water samples using chemically modified natural sawdust

Chemically modified natural saw dust (CMSD) was prepared via hydrothermal reaction between citric acid and sawdust then the CMSD characterized using some qualified techniques such as scanning electron microscopy (SEM) and FT-IR. The adsorption capability of modified sawdust towards Hg(II) was significantly increased because of the introduction of carboxylic groups on CMSD’ surface during the modification, and the adsorption capability was linearly reliant on carboxylic sites level to some extent. The prepared CMSD was employed for uptake of Hg2+ from different samples. Sorption parameters; which include pH, temperature, sorption’s time and sorption’s concentration were evaluated to determine the best conditions for sorption. In addition, the sorption uptake of CMSD was 80 mg g-1. The samples including Hg2+ was used as analytical applications on the present method and the observed-data is promising.

Lumped Approach for Reactive Transport of Organic Compound Mixtures through Simulated Aquifer Sands in Lab-Scale Column Tests

The feasibility of the lumped approach for reactive transport of 12 organic compounds in mixtures through simulated aquifer sands with different organic carbon content (foc) within soil columns was evaluated. From direct measurements of effluent samples and temporal and spatial pore-water concentration profiles within soil columns, 12 organic compounds in mixtures were sorbed to different extents due to the different dependence of sorption on foc. Considering the tradeoff between accuracy and simplicity, four, five, and six pseudocompounds were determined for simulated aquifer sands with foc of 0.006%, 0.051%, and 0.221%, respectively, to approximate the reactive transport of 12 organic compounds in mixtures. Each pseudocompound presented obviously different reactive transport behavior in terms of both sorption capacity and nonlinearity, indicating that each pseudocompound contained components with relatively similar sorption capacities and nonlinearity. Similar to the results from batch equilibrium sorption tests, log Koc can be used as the a priori grouping criterion, although the relative contributions of different forces to the overall sorption may differ for different composition of organic mixtures and foc values of aquifer sands. Finally, the assignment of the Freundlich sorption parameters of pseudocompounds using averages of Freundlich sorption parameters of their components led to reasonable prediction for reactive transport of organic compounds in mixtures through the soil columns. Further study is warranted to evaluate the effective coupling between lumped approach and reactive transport model using complex multicomponent mixtures within heterogeneous subsurface systems.

Novel bimetallic nano particles for sorption of mercury (II) from drinking water: Adsorption experiment and computational studies

The current study proposes fabrication of novel manganese and copper (Mn/Cu) based bimetallic nano particles (NPs) for adsorptive removal of mercury (Hg) ions from aqueous media and examines computational models for adsorption. The Mn/Cu bimetallic NPs were characterized for Atomic Force Microscope (AFM), Energy Dispersive X-rays Spectroscopy (EDS), X-Ray Diffraction (XRD) and Dynamic Light Scattering (DLS) techniques to investigate morphology, surface elemental composition and particle size analysis. Sorption of Hg was carried out using batch experiments in triplicate and residual Hg concentration after sorption was determined using cold vapor atomic absorption spectrometer (CV-AAS). The effect of various parameters such as pH, mass of nano particles, Hg concentration and contact time were optimized. Maximum removal efficiency was 95 % with 2.89 % RSD and maximum adsorption capacity (Q max) observed was 400 mg g-1. AFM images well separated morphology and mean grain size of 450 ± 50 nm of particles, DLS measured average particles size as 110 nm while XRD pattern and EDS results showed successful adsorption of Hg on Mn/Cu bimetallic surface. Ab initio based computational models for different geometries were optimized using semi empirical method through Gaussian software. Computational molecular models were optimized for structures before and after Hg sorption and important physical parameters such as electron spin, Root mean square (RMS) gradient, Adsorption energy, Mulliken charge density (Q) and bond lengths (BL) before and after adsorption were computed. It was concluded that Langmuir adsorption isotherm was favorable for this study and interaction of Hg was more favorable with Mn than Cu because of less adsorption energy (-112.48 eV) and stronger bond formation between them having bond length of 1.6433 Å.

Sorption of Fluoride Ions onto Cellulose and Aluminum Oxide Composites

Sorption properties of a composite based on microcrystalline cellulose and nanosized aluminum oxide film immobilized on its surface in removal of fluoride ions from water are studied. The optimal thickness of the sorbent layer at which the maximum sorption of fluoride ions occurs is 50 nm. The effects of various parameters, such as the solution pH and sorption time, on sorption are studied. The kinetic parameters of sorption and the rate-controlling step of the process are determined. The ion exchange mechanism of fluoride ion sorption onto the prepared sorbent is confirmed by IR spectroscopy.

Nanosilica reinforced EPDM silicone rubber blends: Experimental and theoretical evaluation of mechanical and solvent sorption properties

Nanocomposites of Ethylene Propylene Diene Monomer (EPDM) Rubber and Silicone rubber (SiR) blends were prepared by reinforcing with nanosilica by compounding in an internal mixer. FTIR analysis gave insight into interfacial chemical interaction of nanosilica with rubber blend. TEM analysis revealed that nanosilica was evenly dispersed while at higher nanofiller content, there was slight agglomeration. The mechanical and solvent sorption properties of the nanocomposites were evaluated experimentally for varying nanosilica contents. The maximum increase in tensile strength, obtained for the nanocomposites was 243%. The value of the pure blend and the elongation percentage has increased by 67%. It has also been noted that the sorption parameters decreases by 30%.There were significant variations in the mechanical and sorption properties as the filler content was varied. Micromechanical models were used to predict and analyze elastic modulus. Different sorption models were used to analyze the mode of transport and to observe diffusion kinetics optimization.

Pristine detonation nanodiamonds as regenerable adsorbents for metal cations

The usability of pristine (not functionalized by grafting) detonation nanodiamonds as reversible and repeatedly regenerated adsorbents for metal cations was shown by examples of sorption of cadmium, zinc, nickel, and copper from aqueous solutions. Various pristine nanodiamond surface treatments are discussed. The procedure of oxidative sintering with nitric acid at 250 °C provided a surface with an increased number of carboxyl groups with a sorption capacity above 100 μmol/g for all test cations. Sorption isotherms for test metals (copper, nickel, zinc, and cadmium) can be divided into two distinct parts: a lower part for concentrations of up to 10–15 mmol/L belong to the Langmuir L5 type by Giles and absorption free energies are 8–12 kJ/mol according to the Dubinin–Radushkevich model, evidencing a primarily chemisorption mechanism of the studied cations on micropores in ND surface. The parts of curves above 10–15 mmol/L are described with linear equations, free energies of absorption are 4–6 kJ/mol by Dubinin–Radushkevich that are assigned to physisorption in mesopores. A procedure for the surface regeneration, which is based a similar sintering treatment with nitric acid, was developed. It provided sorption parameters not degraded compared to the starting material; and the regeneration process is repeatable at least for 10 cycles.

Modeling and Optimization of Pollutants Removal during Simultaneous Adsorption onto Activated Carbon with Advanced Oxidation in Aqueous Environment.

The paper presents the results of studies on the modeling and optimization of organic pollutant removal from an aqueous solution in the course of simultaneous adsorption onto activated carbons with varied physical characteristics and oxidation using H2O2. The methodology for determining the models used for predicting the sorption and catalytic parameters in the process was presented. The analysis of the influence of the sorption and catalytic parameters of activated carbons as well as the oxidizer dose on the removal dynamics of organic dyes-phenol red and crystal violet-was carried out based on the designated empirical models. The obtained results confirm the influence of specific surface area (S) of the activated carbon and oxidizer dose on the values of the reaction rate constants related to the removal of pollutants from the solution in a simultaneous process. It was observed that the lower the specific surface area of carbon (S), the greater the influence of the oxidizer on the removal of pollutants from the solution. The proposed model, used for optimization of parameters in a simultaneous process, enables to analyze the effect of selected sorbents as well as the type and dose of the applied oxidizer on the pollutant removal efficiency. The practical application of models will enable to optimize the selection of a sorbent and oxidizer used simultaneously for a given group of pollutants and thus reduce the process costs.

Simulation of diffusive uranium transport and sorption processes in the Opalinus Clay

Diffusive transport and sorption processes of uranium in the Swiss Opalinus Clay were investigated as a function of partial pressure of carbon dioxide pCO2, varying mineralogy in the facies and associated changes in porewater composition. Simulations were conducted in one-dimensional diffusion models on the 100 m-scale for a time of one million years using a bottom-up approach based on mechanistic surface complexation models as well as cation exchange to quantify sorption. Speciation calculations have shown, uranium is mainly present as U(VI) and must therefore be considered as mobile for in-situ conditions. Uranium migrated up to 26 m in both, the sandy and the carbonate-rich facies, whereas in the shaly facies 16 m was the maximum. The main species was the anionic complex CaUO2(CO3)32−. Hence, anion exclusion was taken into account and further reduced the migration distances by 30 %. The concentrations of calcium and carbonates reflected by the set pCO2 determine speciation and activity of uranium and consequently the sorption behaviour. Our simulation results allow for the first time to prioritize on the far-field scale the governing parameters for diffusion and sorption of uranium and hence outline the sensitivity of the system. Sorption processes are controlled in descending priority by the carbonate and calcium concentrations, pH, pe and the clay mineral content. Therefore, the variation in porewater composition resulting from the heterogeneity of the facies in the Opalinus Clay formation needs to be considered in the assessment of uranium migration in the far field of a potential repository.

Moisture sorption characteristics of heat desiccated milk sweet ‘Khoa- peda’ prepared from Buffalo milk

Water activity (aw) is a valuable criterion in food processing affecting food product design and in ensuring food safety during storage. Khoa-peda is an indigenous khoa based dairy sweet prepared by mixing khoa and sugar and is popular all over India. It has a maximum shelf life of 15 days at refrigerated temperatures. The moisture sorption parameters of Khoa-peda prepared from buffalo milk were determined at three different temperatures 15, 25 and 35°C using a gravimetric-static method. The moisture sorption isotherms were found to be of sigmoid shape reflecting a Type II isotherm. At all water activities, the equilibrium moisture content was lower at higher temperatures. From amongst the GAB, Modified Mizrahi, Oswin, Caurie and Halsey models applied to the experimental sorption data of khoa-peda, the GAB model best described the sorption isotherm throughout the entire range of aw. Temperature dependence of GAB parameters was determined by using Arrhenius type equation to correlate the GAB constants with temperature. The hysteresis effect was observed at all the temperatures over the entire range of water activities. The hysteresis loop was of Type ‘C’ according to Everett classification. The effect of temperature was found to reduce the hysteresis. The hysteresis amplitude reduced from 0.303 at 15°C to 0.253 at 35°C, total hysteresis units decreased from 1.55 units at 15°C to 1.25 units at 35°C and the hysteresis energy reduced from 67.72 kJ/kg of water at 15°C to 32.25 kJ/kg of water at 35°C.

A Self‐Consistent Model for Sorption and Transport in Polyimide‐Derived Carbon Molecular Sieve Gas Separation Membranes

AbstractDemand for energy‐efficient gas separations exists across many industrial processes, and membranes can aid in meeting this demand. Carbon molecular sieve (CMS) membranes show exceptional separation performance and scalable processing attributes attractive for important, similar‐sized gas pairs. Herein, we outline a mathematical and physical framework to understand these attributes. This framework shares features with dual‐mode transport theory for glassy polymers; however, physical connections to CMS model parameters differ from glassy polymer cases. We present evidence in CMS membranes for a large volume fraction of microporous domains characterized by Langmuir sorption in local equilibrium with a minority continuous phase described by Henry's law sorption. Using this framework, expressions are provided to relate measurable parameters for sorption and transport in CMS materials. We also outline a mechanism for formation of these environments and suggest future model refinements.

A Self-Consistent Model for Sorption and Transport in Polyimide-Derived Carbon Molecular Sieve Gas Separation Membranes.

Demand for energy-efficient gas separations exists across many industrial processes, and membranes can aid in meeting this demand. Carbon molecular sieve (CMS) membranes show exceptional separation performance and scalable processing attributes attractive for important, similar-sized gas pairs. Herein, we outline a mathematical and physical framework to understand these attributes. This framework shares features with dual-mode transport theory for glassy polymers; however, physical connections to CMS model parameters differ from glassy polymer cases. We present evidence in CMS membranes for a large volume fraction of microporous domains characterized by Langmuir sorption in local equilibrium with a minority continuous phase described by Henry's law sorption. Using this framework, expressions are provided to relate measurable parameters for sorption and transport in CMS materials. We also outline a mechanism for formation of these environments and suggest future model refinements.

Sorptive removal of malachite green dye by activated charcoal: Process optimization, kinetic, and thermodynamic evaluation

Adsorbents are attracting growing interest due to their potential applications in various research areas like the sorption of toxic dyes from aqueous environments. This paper describes the sorptive removal of malachite green (MG) on activated charcoal (AC) from the aqueous solutions. Various sorption parameters such as adsorption capacity, the influence of pH, equilibration time, and initial dye concentration were systematically investigated. Experimental results that the maximum uptake of the dye onto the sorbent was 27 ​mg/g and the equilibrium was reached in about 45 ​min. The MG uptake by AC is strongly favored in an acidic environment. An abrupt decrease in adsorption was seen for pH values greater than 5. Different adsorption isotherms including Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) were tested to validate the sorption data. The kinetics reveals that the adsorption of MG on AC was a second-order kinetic process. The intraparticle diffusion rate, Kid, was 1.82 ​mmol ​g−1 min−1/2. Thermodynamic studies showed that the adsorption of MC on AC was exothermic and spontaneous. In short, powder activated charcoal can be used as a potential adsorbent for the removal of various effluents particularly dyes drained into the water systems.

The performance of activated carbon/NiFe2O4 magnetic composite to retain heavy metal ions from aqueous solution

A novel magnetic activated carbon composite (AC/NiF) was synthesized by a precipitation method and applied in retention of Cu(II), and Zn(II) ions from aqueous solutions. The impact of different sorption parameters such as: equilibration time, solution pH value, competing cations and ionic strength on the amount sorbed of Cu(II), and Zn(II) was clarified. Results illustrated that the magnetic composite had retention ability towards both metal ions significantly higher than that of activated carbon (AC). The magnetic composite exhibited an affinity to adsorb Cu(II) higher than Zn(II) ions. The maximum sorption capacities (Qmax) of the applied magnetic composite (AC/NiF) towards Cu(II) and Zn(II) were 105.8 and 75.1 mg·g−1, respectively. Retention of Cu(II) and Zn(II) was proposed to be achieved though an ion exchange and surface adsorption in neutral conditions, while precipitation was believed to be the relevant mechanism in their removal from basic solutions. The kinetic studies showed that sorption process followed the kinetics of pseudo-second-order reactions with rate constant of 3 × 10−3 and 2 × 10−3 min−1 for sorption of Cu(II) and Zn(II) onto AC/NiF composite. Removal of Cu(II) slightly decreased with increasing the ionic strength of aqueous solution, using NaCl as a background electrolyte. In contrast, presence of Mn(II), Mg(II) and Co(II) in reaction solutions highly depressed the sorption of Cu(II) and Zn(II) with a competing efficiency followed the order: Mg(II) > Mn(II) > Co(II).The magnetic composite was rapidly recovered from aqueous solution by an external magnetic field, and effectively regenerated using 0.1 mol·L−1 HCl and 0.1 mol·L−1 FeCl3as eluents. Sorption of Cu(II) and Zn(II) onto the surface of AC/NiF composite occurred via a spontaneous reaction. And thermodynamically favorable process had ΔHo values of 30.9 kJ·mol−1 and 19.7 kJ·mol−1, respectively. The results confirm that the magnetic composite can be viewed as a promising novel composite opens new opportunities for the attainment of required adsorption and operative magnetic separation.

Leaching behaviour appraisal of eight persistent herbicides on a loam soil amended with different composted organic wastes using screening indices

The addition of organic wastes is a common agronomic practice in some Mediterranean regions to increase soil organic matter. In addition, they consume high amounts of agrochemicals. Hand-packed soil columns were used to evaluate the effect of three different composted organic soil amendments (agro-forestry, agro-industrial and animal manure) on the leachability of eight persistent herbicides. A new leaching index based on the amounts recovered from leachates and referred as Experimental Leaching Index (ELI) is proposed according to the mean annual precipitation in a specific place. This index is compared with others such as Groundwater Ubiquity Score (GUS), Relative Leaching Potential Index (RLPI) and Leachability Index (LIX), which only include degradation (DT50) and sorption (KOC) parameters. According to ELI, metribuzin is very mobile in all cases, while terbuthylazine, chlorotoluron and isoproturon present high leachability only in unamended soil reducing their leaching potential in amended soils. Aclonifen, oxyfluorfen, trifluralin and pendimethalin behave in all cases as immobile (non-leacher) compounds.

Sorption of rare earth coordination compounds

Rare earth elements (REEs) are valuable and strategically important in many high-technology areas, such as laser technology, pharmacy and metallurgy. The main methods of REE recovery are precipitation, extraction and sorption, in particular ion exchange using various sorbents, which allow to perform selective recovery and removal of associated components, as well as to separate rare earth metals with similar chemical properties.
 The paper examines recovery of ytterbium in the form of coordination compounds with Trilon B on weakly basic anion exchange resin D-403 from nitrate solutions. In order to estimate thermodynamic sorption parameters of ytterbium anionic complexes, ion exchange process was carried out from model solutions under constant ionic strength specified by NaNO3, optimal liquid to solid ratio, pH level, temperatures 298 and 343 K by variable concentrations method. Description of thermodynamic equilibrium was made using mass action law formulated for ion exchange equation and mathematically converted to linear form. Values of equilibrium constants, Gibbs free energy, enthalpy and entropy of the sorption process have been calculated. Basing on calculated values of Gibbs energy, a sorption series of complex REE ions with Trilon B was obtained over anion exchange resin D-403 from nitrate solutions at temperature 298 K. Sorption characteristics of anion exchange resin have been estimated: total capacity, limiting sorption of complex ions, total dynamic capacity and breakthrough dynamic capacity.

The silicon availability in paddy soils as predicated by isothermal adsorption curve

Silicon (Si) is important for rice growth and development. Hence, it is urgent and necessary to evaluate the silicon availability of paddy soils. At present, the content of available silicon in soils is measured with 1 M acetic acid–sodium acetate (pH 4.0) buffer solution to estimate the silicon availability of paddy soils, whereas the method may not be used to evaluate silicon availability of paddy soils which are rich in calcium carbonate, or alkaline or applied with the slag. The sorption equation parameters for predicting the silicon availability of paddy soils are discussed. Isothermal adsorption with silicon equilibrium solutions (SiO2 content 0, 10, 20, 40, 60, 80, 100 mg L−1) and a pot experiment with rice plants (CK and Si treatments) were carried out with 18 paddy soils (0–20 cm) collected from major rice-producing areas in Liaoning Province of Northeast China to quantify the relationships between Si sorption parameters and soil silicon supply availability. The results showed that the equation y = bx − a could describe the Si sorption feature of 18 soils, and there were obvious differences in parameters a, b, and a/b of different soils. The y-axis intercept a of the isothermal adsorption curve linear equation indicates the content of exchangeable silicon in soils and can be used as an index representing soil silicon availability. The a value was significantly correlated with soil organic matter (OM), free iron oxide (Fed), activity of Fe oxides(Feo/Fed), and crystal/cement ratio ((Fed − Feo)/Feo), but not with pH. Parameters b and a/b were not significantly correlated with the soil physical and chemical properties. The relative silicon content (SiRE) and the relative yield of rice (YRE) increased with the a value, and the positive linear correlation between SiRE or YRE and a value reached significant p levels of 5% and 1% respectively. Isothermal adsorption equation parameter a can be used to predict the soil silicon availability, and silicon fertilizer could obviously improve the rice yield at a ≤ 126 mg kg−1 (SiO2).

Influence of sorption parameters on cesium-137 removal using modified activated carbon obtained from corchorus olitorius stalks

Abstract Removal of 137Cs radionuclides from the environment has engrossed the concern of researchers after Fukushima accident. The leakage of radioactive cesium ions can lead up to surface and groundwater contamination, and this leads to pollution of drinking water sources. In this work, corchorus olitorius stalks has been used as a novel precursor for production of low-cost meso porous a ctivated c arbon ( Meso-AC ) and HNO3/H2O2- m odified Meso-AC ( m-Meso-AC ). The physicochemical properties of all adsorbents were evaluated. The influences of sorption parameters and presence of some ligands (humic acid, fulvic acid, and EDTA) on the sorption of 137Cs were studied. The maximum 137Cs capacity of m-Meso-AC was found to be 58.74 mg/g. Efficiency of the new adsorbent to remove 137Cs radionuclides from natural waters (tap, river, and groundwater) was investigated. The studies showed that new adsorbent could be used as promising material for the retention of 137Cs from real radioactive waste and natural water samples.