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.

scholarly journals DETERMINATION OF VANADIUM (V) TRACE AMOUNTS IN OIL SLUDGE AFTER PRELIMINARY CONCENTRATION WITH POLYMER SORBENT

2021 ◽  
Vol 19 (1) ◽  
pp. 18-24
Author(s):  
M.B. Hasanova ◽  
◽  
F.N. Bahmanova ◽  
F.M. Chiragov ◽  
C.I. Mirzai ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Ionic Strength ◽  
Oil Sludge ◽  
Sorption Equilibrium ◽  
Chelating Sorbent ◽  
Mineral Acids ◽  
Amino Salicylic Acid ◽  
Degree Of Sorption ◽  
Sorption Time

A modified sorbent based on copolymer of maleic anhydride with methacrylic acid was proposed for sorption of vanadium (V) concentration. A polymer chelating sorbent with fragments of para-amino salicylic acid was used in the work. Optimal sorption conditions were determined and the dependence of sorption capacity on the acidity of the solution studied. At pH 5, the degree of sorption attains its maximum. The effect of ionic strength on vanadium sorption was studied. Studies have shown that the ionic strength up to 0.6 mol/l does not affect the sorption, after 0.6 mol/l the increase in the ionic strength at the beginning gradually, and then sharply decreases the sorption. The effect of ionic strength on vanadium sorption was studied to show that the ionic strength up to 0.6 mol/l does not affect the sorption, and after 0.6 mol/l the increase in the ionic strength at the beginning gradually, and then sharply decreases the sorption. All further experiments were carried out in the solutions with an ionic strength of 0.6. It was found that as the concentration of vanadium rises in the solution, the amount of sorbed metal increases, and at a concentration of 8.10-3 mol/l it becomes maximum (pH = 5, CV5+ = 8.10-3 mol/l, vtotal = 20 ml, msorb. = 0.03 g, SC = 243 mg/g). The isotherm of vanadium (V) sorption with the synthesized sorbent was constructed. Sorption equilibrium is achieved within 1 hour of contact between the solution and the sorbent. Further growth in the sorption time does not change sorbent’s characteristics. The sorbent extracts vanadium (V) from solutions with a recovery rate of 93%. The effect of different mineral acids (HClO4, H2SO4, HNO3, HCl) of identical concentrations on vanadium (V) desorption from the sorbent was also studied. The results of the analysis showed that the maximum desorption of vanadium (V) occurs in perchlorate acid. The developed method was applied to determine the trace amounts of vanadium in oil sludge with preliminary concentration.

scholarly journals thorium(IV), sorbent, sorption, desorption, clay

2021 ◽  
Vol 2021 (2) ◽  
pp. 64-70
Author(s):  
Fidan Nariman Bahmanova ◽  
Sevinc Rafik Hajiyeva ◽  
Famil Musa Chyragov
Keyword(s):  
Human Body ◽  
Optimal Concentration ◽  
Optimal Conditions ◽  
Special Equipment ◽  
Sorptive Capacity ◽  
Chelating Sorbent ◽  
Thorium Compounds ◽  
Degree Of Extraction ◽  
Static Conditions

The article considers the danger of thorium due to its radioactive toxicity. There has been proved the diversity of thorium compounds and the influence of thorium on a human body and the environment. A polymer chelating sorbent containing fragments of 4-amino - thiouracil has been investigated. An isotherm of thorium sorption with the sorbent is constructed and the optimal concentration conditions are determined: pH = 4; = 6 • 10–3 mol/l; Vob = 25 ml; msorb = 0.03 g; sorptive capacity (CE) = 1 163 mg/g. The degree of extraction of thorium(IV) ions under optimal conditions exceeds 95%. The developed technique was applied to extract thorium from clay. Studying sorption was carried out under static conditions using special equipment.

INTENSIFICATION OF CLEANING OF DRAINS OF DAIRY INDUSTRY

2019 ◽  
Author(s):  
Л.А. Марченко ◽  
Т.Н. Боковикова
Keyword(s):  
Sorption Capacity ◽  
Dairy Industry ◽  
Sorption Process ◽  
Optimal Conditions ◽  
Cleaning Efficiency ◽  
Factors Affecting ◽  
Second Stage ◽  
Coagulation Process ◽  
Model Solutions

Проведен анализ состава сточных вод предприятий молочной промышленности. Исследованы технические характеристики сорбционных материалов, способных восстановить состав ресурса до норм ПДК. Установлено, что применение двухстадийной очистки модельных растворов с использованием на 1й стадии процесса коагуляции, на 2й сорбции позволяет увеличить эффективность очистки до 92. Оценена сорбционная емкость сорбентов и проанализированы факторы, на нее влияющие. Подобраны оптимальные условия проведения процесса сорбции в зависимости от условий и характера объектов очистки. The analysis of the wastewater composition of the dairy industry was carried out. The technical characteristics of a number of sorption materials that can restore the composition of the resource to the MPC standards are investigated. It is shown that the use of twostage purification of model solutions using on the first stage of the coagulation process, on the second stage, the sorption process, allows increase the cleaning efficiency up to 92. The sorption capacity of sorbents was evaluated and the factors affecting it were analyzed, the optimal conditions for the sorption process were selected depending on the conditions and nature of the objects to be cleaned.

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 CAPACITY OF NATURAL FILTER EXISTING MATERIALS ON COPPER CATIONS

2013 ◽  
Vol 3 (4S) ◽  
pp. 39-41
Author(s):  
Eugenia N KALJUKOVA ◽  
Elena V PAVLOVA
Keyword(s):  
Sorption Capacity ◽  
Metal Cations ◽  
Sorption Properties ◽  
Natural Sorbent ◽  
Natural Sorbents ◽  
Filter Materials ◽  
Model Solutions ◽  
Degree Of Extraction ◽  
Copper Cations

Investigated the sorption properties of natural sorption materials (dolomite and shungit) towards cations copper.Defined by the degree of extraction of metal cations of model solutions with the use of original and modified natural sorbents. Studied natural filter materials higher degree stump extraction of copper cations from solution was obtained by natural sorbent-dolomite.

scholarly journals EXTRACTION ABILITY ESTIMATION OF AQUEOUS STRATIFIED SYSTEMS ON EXAMPLE OF COPPER (I, II), CADMIUM AND ZINC EXTRACTION FROM HYDROCHLORIC ACID SOLUTIONS

2019 ◽  
Vol 62 (11) ◽  
pp. 57-62
Author(s):  
Mikhail I. Degtev ◽  
Anastasya V. Stankova ◽  
Dmitriy S. Knutov ◽  
Aleksandr P. Medvedev ◽  
Mariya Yu. Russkikh
Keyword(s):  
Benzoic Acid ◽  
Organic Acids ◽  
Organic Phase ◽  
Optimal Conditions ◽  
Extraction Ability ◽  
Two Phase ◽  
Sulfate Ions ◽  
Hydrochloric Acid Solutions ◽  
Mineral Acids ◽  
Saturation Method

The ability of diantipyrylalkanes to form liquid two-phase equilibrium without an organic solvent in systems with organic acids - benzoic and salicylic has been investigated. In most cases, the separation of systems is achieved when the ratio of the reagent: acid is 1 – 1.25: 1 – 1.12, heated to 85 °C and in the presence of mineral acids (HCl, H2SO4). The volume of the organic phase from 0.8 to 2.0 ml is sufficient for practical purposes, for example, for the extraction of macro or micro quantities of metal ions. It was established that diantipyrylmethane (reagent, L) or its homolog propyldianthipyrylmethane does not form stratification in systems with benzoic and salicylic acids in the absence of HCl or H2SO4 solutions. And, on the contrary, the more basic reagent - hexyldianthipyrylmethane stratifies solutions containing these organic acids without HCl or H2SO4. At the same time, the introduction of the latter provides the separation of aqueous systems with the participation of all reagents diantipyrylmethane, propyldianthipyrylmethane, and hexyldianthipyrylmethane. The volume of the organic phase is increased to 2.0 ml or more. The extraction of macroquantities of ions of cadmium (II) and zinc (II) was studied under optimal conditions of stratification. Chloride or sulfate ions served as ligands. The optimal conditions for the extraction of metal cations, the composition and mechanism of the extracted complexes were determined. The ratio of hexyldianthipyrylmethane : metal is determined by the saturation method, which turned out to be equal to hexyldianthipyrylmethane : Me2+ = 2 : 1. With this ratio, the organic phase becomes solid. Chemical analysis of the extract with an excess of hexyldianthipyrylmethane and benzoic acid for all components showed the ratio of hexyldianthipyrylmethane : H+ : Me2+ : Cl- : benzoic acid = 4.0 : 3.9 : 1.0 : 4.3 : 2.2, which corresponds to the complex (RH)2[MeCl4]∙2RH∙benzoic acid, solvated by two molecules of hexyldianthipyrylmethane benzoate.

scholarly journals INTERACTION OF PHENYLALANINE AND HISTIDINE ON EQUILIBRIUM CHARACTERISTICS OF ADSORPTION OF AMINO ACIDS ON CLINOPTILOLITE

2018 ◽  
Vol 59 (1) ◽  
pp. 26
Author(s):  
D.L. Kotova ◽  
T.A. Krysanova ◽  
Thi Long Do ◽  
S.Yu. Vasilyeva
Keyword(s):  
Amino Acids ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Maximum Degree ◽  
Sorption Equilibrium ◽  
Equilibrium Sorption ◽  
The Individual ◽  
Degree Of Extraction

Parameters of the equilibrium sorption of phenylalanine and histidine on clinoptilolite from aqueous solutions containing the individual amino acids and their mixtures were presented. The contribution of exchange and non-exchange components in the adsorption capacity of clinoptilolite was determined. It was found that the interfacial distribution of amino acids is determined by the ratio of CHis / CPhe and manifested in sorption equilibrium characteristics. The maximum degree of extraction of histidine is achieved at the ratio of CHis / CPhe equals to 1: 3.

scholarly journals STUDY OF THE POSSIBILITY OF EXTRACTION OF CHROMIUM IONS BY COMPOSITE SORBENTS

2020 ◽  
pp. 34-38
Author(s):  
S. A. Orlova ◽  
O. O. Tuzhikov ◽  
T. V. Khokhlova ◽  
O. I. Tuzhikov
Keyword(s):  
Waste Water ◽  
Kinetic Parameters ◽  
Sorption Capacity ◽  
Composite Structures ◽  
Polymer Materials ◽  
Water Solutions ◽  
Chromium Ions ◽  
Composite Sorbents ◽  
Galvanic Production ◽  
Degree Of Extraction

As a result of oxidative dehydropolycondensation of aniline on the surface of polymer materials, effective composite sorbents were obtained that can absorb bichromate ions from solutions. The optimal content of polyaniline was determined, which allows achieving the specific sorption capacity of composite structures of 1.49 mg-EQ/g and the degree of extraction of highly toxic chromium of 99.74 %. The developed composite sorbents have high kinetic parameters and can successfully solve the problems of treatment of waste water solutions of galvanic production.

scholarly journals Solid Phase Extraction of Trace Amounts of Praseodymium Using Transcarpathian Clinoptilolite

2019 ◽  
Vol 3 (1) ◽  
pp. 27 ◽  
Author(s):  
Olha Stashkiv ◽  
Volodymyr Vasylechko ◽  
Galyna Gryshchouk ◽  
Ihor Patsay
Keyword(s):  
Detection Limit ◽  
Solid Phase Extraction ◽  
Sorption Capacity ◽  
Flow Rate ◽  
Salt Solution ◽  
Ph Value ◽  
Solid Phase ◽  
Phase Extraction ◽  
Optimal Conditions

Sorptive properties of the Transcarpathian clinoptilolite towards Pr(III) were studied under dynamic conditions. The sorption capacity of clinoptilolite under optimal conditions (sorbent grain diameter of 0.20–0.31 mm; pH 9.0, temperature of preliminary precalcination of 350 °C, and flow rate of the Pr(III) salt solution with the concentration of 1.0 μg·mL−1 through the sorbent of 5 mL·min−1) was equal to 47.5 mg·g−1. The best desorbent of Pr from the clinoptilolite was the 1 M solution of KCl acidified with HCl to a pH value of 3.0. The method of Pr(III) trace amounts preconcentration in a solid phase extraction mode with further determination of this REE via spectrophotometric technique was developed. The linearity of the proposed method was evaluated in the range of 2–100 ng·mL−1 with detection limit of 0.7 ng·mL−1.

scholarly journals INFLUENCE OF BACKGROUND ELECTROLYTE AND SURFACE-ACTIVE SUBSTANCES ON EFFICIENCY OF ELECTRO-FLOTATION EXTRACTION OF HARDLY SOLUBLE EUROPIUM COMPOUNDS

2020 ◽  
Vol 63 (5) ◽  
pp. 76-83
Author(s):  
Artem V. Kolesnikov ◽  
Roman D. Tangalichev ◽  
Nikolay B. Berezin ◽  
Zhanna V. Mezhevich
Keyword(s):  
Particle Size ◽  
Background Electrolyte ◽  
Model Systems ◽  
High Tech ◽  
Ionic Surfactant ◽  
Hydrogen Energy ◽  
Optimal Conditions ◽  
Surface Active ◽  
Degree Of Extraction ◽  
Active Substances

Europium and its compounds are widely used in high-tech processes of nuclear and hydrogen energy, electronics, medicine and other fields. In this work, the regularities of electroflotation extraction of hardly soluble europium compounds from model systems were obtained and analyzed. The aim of the work is to obtain data on the process of electroflotation extraction of hardly soluble europium (III) compounds from model systems with background electrolyte and the addition of surface-active substances, establishing optimal conditions for efficient extraction of hardly soluble europium (III) compounds. The research was conducted at room temperature (20 ± 2 °C) in a non- current electric flotator of periodic action, which is made in the form of a vertical column. The cross-sectional area of the electric flotator is 10 cm2, the volume of the treated solution is 500 ml, the height of the apparatus is 800 mm, and the sampling valve is located at a height of 40 mm from the electrode unit. The electrode unit consists of an insoluble anode made of ORTA (titanium with ruthenium oxide coating) and of a cathode made of stainless steel mesh (cell size 0.5 × 0.4 mm, wire thickness 0.3 mm). The mass concentration of europium (III) was determined by a mass-spectrometer with inductively coupled plasma of Termo Scientific brand. Determination of particle size and particle size distribution, surface charge of particles of the dispersed phase (ξ) were carried out using a Photocor Compact-Z laser particle analyzer. The efficiency of the process of extracting hardly soluble compounds of Eu3+ was evaluated by the degree of extraction α (%). The objects of study are colloid-dispersed systems of poorly soluble compounds of europium (III) in aqueous solutions in the presence of surface-active substances of various nature and background electrolytes. The initial aqueous solution contains: СEu3+ - 0.1 g/l, Cbackground electrolyte - 1 g/l, background salts: NaCl, NaNO3, Na2SO4; Csas - 5 mg/l. It has been shown that for each type of solution the efficiency of the electroflotation process is achieved at certain pH. It is established that the optimal conditions for the extraction of europium (III) compounds are: volume current density, Jv = 0.4 A/l; process duration 10 min. For nitrate background the degree of extraction is maximum at pH 10 - 11 and at the presence of an anionic surfactant additive in the solution (Оxy surfactant A1218). When extracting europium (III) compounds from a system with a sulphate background the best results were obtained at pH values of 8 and 10, as well as the addition of an anionic and, or cationic (Septa surfactant XEV70) surfactant. Chloride background showed the best conditions for the extraction of europium (III) at pH 7 with the addition of a non-ionic surfactant of PEO-1500 brand. The degree of extraction of europium is 98-99%.

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