scholarly journals Sorption of V and VI group metalloids (As, Sb, Te) on modified peat sorbents

2016 ◽  
Vol 14 (1) ◽  
pp. 46-59 ◽  
Author(s):  
Linda Ansone-Bertina ◽  
Maris Klavins
Keyword(s):  
Sorption Capacity ◽  
Batch Tests ◽  
Physical Sorption ◽  
Sorption Ability ◽  
A Minor ◽  
Competing Ions ◽  
Optimal Ph ◽  
Sorption Time

AbstractThe present work investigates arsenic, antimony and tellurium sorption using iron modified peat. The results were obtained using batch tests and the sorption was studied as a function of initial metalloid concentration, pH and sorption time, as well as the presence of competing substances. The obtained results indicate that modification of peat with Fe compounds significantly enhances the sorption capacity of the sorbents used for sorption of arsenic, antimony and tellurium. The optimal pH interval for the sorption of Sb(III) is 6.5–9 and for As(V) and Sb(V) – 3–6, while As(III) and tellurium sorption using Fe-modified peat is favourable in a wider interval of 3–9. The presence of competing ions as well as HA affect sorption of metalloids on Fe-modified peat. A minor impact on the reduction of metalloid sorption was detected in the presence of nitrate, sulphate, carbonate and tartrate ions, while in the presence of phosphate and HA the sorption ability of metalloids can be considerably reduced. The obtained results of kinetic experiments indicate that sorption of metalloids on Fe-modified peat mainly occurs relying on mechanisms of physical sorption processes.

Sorption of Uranium (VI) Ions by a Sorbent Based on a Copolymer of Maleic Anhydride with Styrene Modified by N, Nand#39;-diphenylguanidine

2020 ◽  
Vol 42 (3) ◽  
pp. 413-413
Author(s):  
Fidan Bahmanova Fidan Bahmanova ◽  
Sevinj Hajiyeva Sevinj Hajiyeva ◽  
Elnara Alirzaeva Elnara Alirzaeva ◽  
Nazim Shamilov and Famil Chyragov Nazim Shamilov and Famil Chyragov
Keyword(s):  
Sorption Capacity ◽  
Ionization Constants ◽  
Saturation Curve ◽  
Optimal Conditions ◽  
Sorption Equilibrium ◽  
Ionogenic Groups ◽  
Chelating Sorbent ◽  
Mineral Acids ◽  
Degree Of Extraction ◽  
Sorption Time

In this paper the results of a study on the extraction and concentration of micro-quantities of uranium (VI) with a polymeric chelating sorbent with fragments of N, N and#39;diphenylguanidine is discussed. There was studied a static sorption capacity on K+ ions ((SSC = 9.3 mmol / g) and there were determined the ionization constants of ionogenic groups ( =3.97; =8.47) by potentiometric titration. The optimal conditions of the sorption of elements (pHopt, sorption time - τ, the influence of ionic strength - μ) were determined by the dependence of the sorption capacity (SC, mg/g) on the parameter being studied; the sorption capacity of the sorbent (SC) was determined from the saturation curve constructed under optimal sorption conditions. The maximum degree of extraction of uranium by sorbents is achieved from solutions with pH 5. Sorption equilibrium is achieved within 2 hours of contact of the solution with the sorbent. With an increase in the concentration of the uranyl ion in the solution, the amount of the sorbed metal increases, and at a concentration of 8•10–3 mol/l, it becomes maximal (pH = 5, = 8•10–3 mol/l, Vgen = 20 ml, msorb. = 0.05 g, SC = 1258 mg/g). Limits of detection (3, n=20) are 13.9 ng/ml. The effect of various mineral acids(HClО4, H2SО4, HNО3, HCl) with the same concentrations on the desorption of uranium (VI) from the sorbent was studied. The developed technique was applied to determine uranium in oil sludge.

Removal of Anions from Solution by Calcined Hydrotalcite and Regeneration of Used Sorbent in Repeated Calcination-Rehydration-Anion Exchange Processes

1999 ◽  
Vol 64 (9) ◽  
pp. 1517-1528 ◽  
Author(s):  
František Kovanda ◽  
Eva Kovácsová ◽  
David Koloušek
Keyword(s):  
Anion Exchange ◽  
Sorption Capacity ◽  
Sorption Isotherms ◽  
Layered Crystal ◽  
Calcined Hydrotalcite ◽  
Capacity Evaluation ◽  
Exchange Processes ◽  
Sorption Ability ◽  
Subsequent Calcination ◽  
Rehydration Process

Synthetic hydrotalcite calcined at 350-550 °C was used for the removal of arsenate, chromate, and vanadate ions from water solutions. The initial anion concentrations were 0.002 mol l-1. The sorption isotherms were measured at 20 °C and at neutral pH. The Langmuir adsorption isotherm was used for the sorption capacity evaluation. The ability of the calcined hydrotalcite to remove the anions from solution decreased in the order of vanadate - arsenate - chromate. The hydrotalcite calcined at 450 °C exhibited the best sorption ability for all the anions. The sorbed anions were released by anion exchange in a carbonate-containing solution and the hydrotalcite after subsequent calcination was used again for the removal of anions. The repeating cycles calcination-rehydration-anion exchange gradually reduced the adsorption capacity of the hydrotalcite. The sorption capacity decreased by 50% after the first two cycles but it did not change significantly in the subsequent cycles. When chromate anions were adsorbed, the decrease in sorption capacity was not observed during repeated calcination-rehydration-anion exchange cycles. The change in the sorption capacity was influenced by the ability of calcined hydrotalcite to regenerate the layered crystal structure during the rehydration process.

scholarly journals Time changeability model of the bog ore sorption ability

2014 ◽  
Vol 21 (1) ◽  
pp. 113-123
Author(s):  
Kazimierz Gaj ◽  
Hanna Cybulska-Szulc
Keyword(s):  
Statistical Analysis ◽  
Regression Model ◽  
Sorption Capacity ◽  
Time Variation ◽  
Iron Ore ◽  
Theoretical Calculations ◽  
Sorption Ability ◽  
Laboratory Examinations

Abstract Basing on long-standing cyclic measurements of sludge-originated biogas composition and considering statistical analysis of their results, a regression model describing time variation of biogas desulfurization using bog iron ore has been developed. The model was verified by theoretical calculations and results from laboratory examinations of the sorbent. It was also used to estimate the depletion time and sorption capacity of the bed and to determine the demand index for bog ore.

Phosphate sorption capacity of European volcanic soils

2010 ◽  
Vol 59 (1) ◽  
pp. 77-84
Author(s):  
Gy. Füleky
Keyword(s):  
Sorption Capacity ◽  
Soil Property ◽  
High Ratio ◽  
Surface Reactivity ◽  
Soil Horizon ◽  
Phosphate Adsorption ◽  
Volcanic Soils ◽  
Phosphate Binding ◽  
Phosphate Sorption ◽  
Sorption Ability

The aim of the presented study was to prepare the phosphate sorption isotherms of 20 European volcanic soil profiles and some other Hungarian and German volcanic soils (n = 114) used in the experiment and to establish the soil characteristics determining the phosphate sorption capacity of these soils. The Langmuir isotherm well describes the phosphate sorption of European volcanic soils at bright concentration interval 0–600 mg·dm -3 P. The calculated phosphate adsorption maximum (P max ) is an excellent soil property for characterizing the surface activity of soils developed on volcanic parent material. The calculated phosphate sorption maxima of soils included in the experiment ranged from 0 to 10.000 mg P·kg -1 . Some of the volcanic soils sorbed a high ratio of the added phosphate at low concentrations, while others sorbed somewhat less. The difference in the phosphate binding affinity of soils caused the differences in the shape of the Langmuir adsorption isotherms. P retention % is a WRB diagnostic requirement of andic soil horizon. It was supposed that the phosphate sorption maximum (P max ) gives a better characterization of the surface reactivity of volcanic soils. As it was predicted, oxalate soluble Al is the most important soil property, which dominantly (in 73%) explained the phosphate sorption ability of European volcanic soils.

Fluoride removal using calcined Mg/Al layered double hydroxides at high fluoride concentrations

2013 ◽  
Vol 13 (2) ◽  
pp. 249-256 ◽  
Author(s):  
Jae-Hyun Kim ◽  
Chang-Gu Lee ◽  
Jeong-Ann Park ◽  
Jin-Kyu Kang ◽  
Seo-Young Yoon ◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Xrd Analysis ◽  
Fluoride Removal ◽  
Batch Experiments ◽  
Solution Ph ◽  
Maximum Sorption Capacity ◽  
Batch Tests ◽  
Bet Analysis ◽  
High Fluoride ◽  
Equilibrium Test

The aim of this study was to investigate the removal of high fluoride concentrations by Mg/Al layered double hydroxide (LDH). Batch experiments were conducted using calcined Mg/Al LDH at 105 °C (LDH-105), 300 °C (LDH-300), and 700 °C (LDH-700). The Brunauer-Emmett-Teller (BET) analysis showed that the specific surface area of LDH-700 was 1.7−1.8 times larger than those of LDH-105 and LDH-300. The X-ray diffractometry (XRD) analysis indicated that LDH-105 had a layered structure (Mg4Al2(OH)12CO3 · 3H2O) while LDH-300 and LDH-700 were composed of mixed metal oxides (Al8O3N6 + Mg0.44Al0.56) and magnesium oxide (MgO), respectively. Batch tests showed that the fluoride sorption capacity of LDH-700 was 1.7−2.9 times greater than those of LDH-105 and LDH-300 at initial fluoride concentrations of 100 and 200 mg/L. The kinetic data showed that fluoride sorption to LDH-700 arrived at equilibrium after 12 h. The equilibrium test demonstrated that the maximum sorption capacity of LDH-700 was 91.401 mg/g. Additional batch experiments indicated that the sorption capacity of LDH-700 decreased slightly when the solution pH was increased from 4.0 to 9.0. Moreover, fluoride sorption to LDH-700 decreased considerably in the presence of anions such as phosphate, sulfate, and carbonate in the following order: HPO42− > SO42− > CO32− > Cl− > NO3−.

scholarly journals THE INFLUENCE OF CHITIN AMINATION ON THE EFFECTIVENESS OF RB5 AND RY84 DYE SORPTION

2018 ◽  
Vol XXIII ◽  
pp. 66-75
Author(s):  
Urszula Filipkowska ◽  
Tomasz Jóźwiak ◽  
Paula Bugajska ◽  
Małgorzata Kuczajowska-Zadrożna
Keyword(s):  
Experimental Data ◽  
Molecular Weight ◽  
Sorption Capacity ◽  
Reactive Dyes ◽  
Adsorptive Capacity ◽  
Reactive Black 5 ◽  
Maximum Sorption Capacity ◽  
Dye Sorption ◽  
Maximum Sorption ◽  
Optimal Ph

This article presents the influence of chitin amination on the effectiveness of RB5 and RY84 dye sorption. For chitin and chitin modified by amination, the optimal pH of sorption and the maximum sorption capacity were determined in relation to two reactive dyes: Reactive Black 5 (RB5) and Reactive Yellow 84 (RY84), differing in the active group and molecular weight. Three sorption models were used to describe the experimental data: Langmuir, Langmuir 2 and Freundlich. The highest sorption capacity was obtained for aminated chitin for both tested dyes: 386.53 mg/g for RB5 and 261.56 mg/g for RY84. In the case of sorption on unmodified chitin, the sorption capacities were lower: up to 235.65 mg/g.d.m. for RB5 and 208.88 mg/g.d.m. for RY84. The modification of chitin by amination has a beneficial effect on the amount of dye adsorbed in the process. The adsorptive capacity increased by 1.6-times in the case of RB5 and 1.25-times in case of RY84.

scholarly journals Experience of regional soil-geochemical mapping

2020 ◽  
Vol 26 (1) ◽  
pp. 584-594
Author(s):  
Maria Kondratyeva ◽  
Natalya Bazhukova
Keyword(s):  
Heavy Metals ◽  
Soil Properties ◽  
Cation Exchange ◽  
Sorption Capacity ◽  
Russian Federation ◽  
Distribution Area ◽  
Expert Assessment ◽  
Soil Horizons ◽  
Sorption Ability ◽  
The Russian Federation

The developed series of soil-geochemical maps reveals the ecological functions of soils and the soil cover associated with the processes of migration, transformation, and accumulation of chemicals substances in landscapes. The thematic basis for the maps was the electronic version of the soil map of the Russian Federation with a scale of 1 : 2 500 000 and the Unified State Register of Soil Resources of the Russian Federation developed on its basis, as well as regional sources and the database of soil properties of the Perm Territory. Prepared maps represented by two main blocks — basic and applied, each of which, in turn, includes constituent and assessment maps. The article discusses the methodological foundations, the compilation methodology and the content of the presented maps. Baseline maps reveal the most common soil-geochemical patterns of migration and accumulation of substances in soils. The block includes: maps of the thicknesses of organogenic and humus soil horizons, cation exchange capacities, and sorption capacity of soils. These maps make it possible to characterize the sorption properties of surface soil horizons as the most important geochemical barriers for technogenic substances. An analysis of the content of these maps allows us to conclude that the sorption capacity of the most common soils in the region is estimated to be very low and low, due to the low thickness of the humus horizons and low cation exchange capacity of podzolic soils. Podzolized chernozems, soddy-gley and soddy-carbonate soils have an increased sorption ability, but their distribution area is small. The high sorption capacity of soils is associated with a significant thickness of organogenic horizons in hydromorphic soils. The application block is devoted to the analysis of soil properties in relation to heavy metals as a priority group of pollutants for which the soil is a depositing medium. Two maps are included in this block — “Conditions for the migration of heavy metals in soils” and “Sensitivity of soils”. The conditions for the migration of heavy metals highlighted on the map of the same name are represented by 12 options. In the northern and central parts of the region, conditions prevail that combine constant or seasonal recovery conditions and low pH values. In the southern part of the region they are replaced by oxidative weakly acidic. The assessment of the sensitivity of soils to heavy metal pollution is given on the basis of expert assessment. The soils of the region are defined as sensitive and very sensitive, that is, they relatively quickly change their properties to a negative side under the influence of anthropogenic load.

scholarly journals Removability Efficiency of Heavy Metals with Modified Humate from Aqueous Media

2014 ◽  
Vol 16 (4) ◽  
Author(s):  
A.S. Taubayeva ◽  
U.Z. Dzhusipbekov ◽  
G.О. Nurgalieva ◽  
A.K. Shakirova ◽  
H. Temel ◽  
...  
Keyword(s):  
Metal Ions ◽  
Sorption Capacity ◽  
Humic Acids ◽  
Aqueous Media ◽  
Toxic Metal ◽  
High Reactivity ◽  
Complex Compounds ◽  
Sorption Ability ◽  
Maximum Sorption ◽  
High Sorption

<p>The main aim of this work was to study the possibility of using amine-modified humate as a sorbent for the purification of water from heavy metal ions (Cu&amp;Co). One of the effective methods of creating new sorbents of humic acids is chemical modification based on the high reactivity of the functional groups in the composition of humic acids. The possibility of modification of humic acid with bis(3-aminopropyl)  amine was illustrated. Modification was carried out with the aim of increasing its sorption capacity. Metal-humate complexes were also obtained by an ion-exchange procedure with modified humate (Mod-Hum) by employing metal salts such as Cu(CH<sub>3</sub>COO)<sub>2</sub>·H<sub>2</sub>O, Co(CH<sub>3</sub>COO)<sub>2</sub>·4H<sub>2</sub>O. Maximum sorption percentages of Mod-Hum achieved were about 99.2% for Cu (II) and 90% for Co (II). The sorption degree depending on pH changes was studied in the range of 2 to 8, the sorption ability of the sorbents was stated to increase with the increase in pH. The degree of sorption of copper (ІІ) on Mod-Hum in the studied range of рН 5 was higher and of cobalt (II) for which the sorption is optimal at higher values (рН 7-8). It is stated that sorption degree increases with the increase in time from 15 min to 2 h. The adsorption of toxic metal ions with Mod-Hum was measured by atomic absorption spectroscopy (AAS). The experimental results on determination of the adsorption isotherm were evaluated with the Langmuir equation. It is shown that the sorbent develops a high sorption capacity in regard to ions of Cu (18.42 mg/g) and Со (16.25 mg/g). All the obtained complex compounds were analyzed and characterized by FT infrared spectroscopy (FTIR), scanning electron microscopy (SEM).</p>

Sorption of Metal Ions by New Sulfur-Containing Ionite GMA-MMA-TDGA

2017 ◽  
Vol 863 ◽  
pp. 48-52
Author(s):  
Gulzhan E. Abdraliyeva ◽  
N.A. Bektenov ◽  
N.A. Samoilov ◽  
A.K. Baidullaeva
Keyword(s):  
Sorption Capacity ◽  
Contact Time ◽  
Copper Ions ◽  
Zinc Ion ◽  
Exchange Capacity ◽  
Ion Exchanger ◽  
Static Exchange Capacity ◽  
Sorption Ability ◽  
Static Conditions ◽  
Sulfur Containing

А new polyethyleneimine sulfur-containig exchanger network structure with static exchange capacity of 0.1 N solution of HCl 4.7 mEq/g was obtained by polycondensation of glycidyl methacrylate, methyl methacrylate and phosphoric acid. Sorption of copper (II) and zinc (II) ions was studied and investigated in static conditions from model solutions of sulfates of copper and zinc, in dependence on their concentration and pH, as well as their contact time with the ion-exchanger. Found that the magnitude of the sorption capacity of the ion exchanger for ions of copper (II) at pH 3.6 CuSO4 solution is 4.03 mg / g. It has been established that zinc ion (II) is absorbed best by the sorbent at pH 4.06. In these conditions the sorption capacity of the sorbent for copper ions (II) and zinc (II) respectively equal to 0.8225mmol / g (Cu) and 0.8305mmol / g (Zn). The sorption ability new sulfur-containing ionite with respect to copper ions (II) and zinc (II) is significantly higher than for industrial ionite of KU-2x8.

scholarly journals Biochar Effect on Nutrients Availability to Barley

2020 ◽  
Vol 76 (2) ◽  
pp. 43-53
Author(s):  
Irina Mukhina ◽  
Elena Rizhiya ◽  
Tatiana Bankina
Keyword(s):  
Chemical Composition ◽  
Porous Structure ◽  
Sorption Capacity ◽  
Nutrient Solution ◽  
Sorption Experiment ◽  
Nutrient Storage ◽  
Sorption Ability ◽  
Dry Biomass ◽  
Nutrients Availability ◽  
Specific Influence

Biochar can serve as a soil ameliorant preventing nutrient leaching. Due to its porous structure and chemical composition, it can also adsorb elements on its surface. However, various biochars have different sorption ability, and the mechanistic understanding of nutrient storage in biochar is missing. It is not clear if nutrients adsorbed by biochar will be available for plants. Therefore, it is necessary to investigate biochar efficacy in pure substrates to characterise its specific influence on plants. In this study, the sorption capacity and ability of the wood-based biochar to provide barley plants with nutrients was investigated. The sorption capacity of biochar was investigated by saturating it with Gelrigel nutrient solution. Then nutrient-enriched biochar was tested for its effect on barley growth in comparison with non-enriched biochar. The results of the sorption experiment showed that the wood-based biochar could adsorb high amounts of nutrients such as ammonium (NH4+), potassium, calcium and phosphate (PO43-), but not nitrate (NO3-). Nutrient-enriched biochar showed an ability to support 46% higher dry biomass of barley than non-enriched biochar. These results suggest a potential of nutrient-enriched biochar for recovering essential nutrients for plants.

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