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.

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.

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 Use of metallurgical dust for removal chromium ions from aqueous solutions

2018 ◽  
Vol 28 ◽  
pp. 01029 ◽  
Author(s):  
Magdalena Pająk ◽  
Agnieszka Dzieniszewska ◽  
Joanna Kyzioł-Komosińska ◽  
Michał Chrobok
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Low Cost ◽  
Steel Plant ◽  
Complex Ions ◽  
Maximum Sorption Capacity ◽  
Chromium Ions ◽  
In Series ◽  
High Sorption ◽  
Effective Sorbent

The aim of the study was to determine the potential for the application of dust from steel plant as an effective sorbent for removing Cr(III) and Cr(VI) in the form of simple and complex ions – Acid Blue 193 dye from aqueous solutions. Three isotherms models were used to interpret the experimental results namely: Langmuir, Freundlich, and Dubinin–Radushkevich. Estimated equations parameters allowed to determine the binding mechanism. Based on laboratory studies it was found that the dust was characterized by high sorption capacities for Cr ions and dye from the aqueous solution. The sorption capacity of the dust for Cr(III) and Cr(VI) ions depended on the degree of oxidation, pH of solution and kind of anion and changed in series: Cr(III)-Cl pH=5.0> Cr(III)-SO4 pH=5.0> Cr(III)-Cl pH=3.0> Cr(III)-SO4 pH=3.0> Cr(VI) pH=5.0> Cr(VI) pH=3.0. Dust was also characterized by a high maximum sorption capacity of dye at a range of 38.2 – 91.7 mg/g, depending on the dose of dust. Based on the study it was found that dust from a steel plant, containing iron oxides, can be used as low-cost and effective sorbent to remove pollutions containing chromium ions, especially from acidic wastewater.

scholarly journals Galvanic Production Waste Water Treatment with Electro/coagulation Sludge in Terms of Nickel and Copper Ions

2013 ◽  
Author(s):  
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Copper Ions ◽  
Waste Water Treatment ◽  
Waste Waters ◽  
Chemical Cleaning ◽  
Nickel Ions ◽  
Galvanic Production ◽  
Soluble Aluminum ◽  
Electro Coagulation

A possibility of nickel ions and copper ions recovery from galvanic waste waters with electro-coagulation sludge that is formed in the process of electro/chemical cleaning of galvanic drainage pipes with the use of soluble aluminum anodes has been demonstrated. Nickel ions recovery from the galvanic waste water in case of the optimal proportion of the sludge has reached at least 55 %.

scholarly journals Contribution of Cross-Linker and Silica Morphology on Cr(VI) Sorption Performances of Organic Anion Exchangers Embedded into Silica Pores

Molecules ◽  
2020 ◽  
Vol 25 (5) ◽  
pp. 1249 ◽  
Author(s):  
Ecaterina Stela Dragan ◽  
Doina Humelnicu
Keyword(s):  
Sorption Capacity ◽  
Organic Anion ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Anion Exchangers ◽  
Fast Kinetics ◽  
Strong Base ◽  
Maximum Sorption Capacity ◽  
Composite Sorbents ◽  
Cross Linker

Removal of Cr(VI) from the environment represents a stringent issue because of its tremendous effects on living organisms. In this context, design of sorbents with high sorption capacity for Cr(VI) is getting a strong need. For this purpose, poly(vinylbenzyl chloride), impregnated into porous silica (PSi), was cross-linked with either N,N,N’,N’-tetramethyl-1,2-ethylenediamine (TEMED) or N,N,N’,N’-tetramethyl-1,3-propanediamine, followed by the reaction of the free -CH2Cl groups with N,N-diethyl-2-hydroxyethylamine to generate strong base anion exchangers (ANEX) inside the pores. The PSi/ANEX composite sorbents were deeply characterized by FTIR spectroscopy, SEM-energy dispersive X-ray spectroscopy (EDX), thermogravimetric analysis (TGA), and water uptake. The sorption performances of composites against Cr(VI) were investigated as a function of pH, contact time, initial concentration of Cr(VI), and temperature. It was found that the cross-linker structure and the silica morphology are the key factors controlling the sorption capacity. The adsorption process was spontaneous and endothermic and well described by pseudo-second-order kinetic and Sips isotherm models. The maximum sorption capacity of 311.2 mg Cr(VI)/g sorbent was found for the composite prepared with mesoporous silica using TEMED as cross-linker. The PSi/ANEX composite sorbents represent an excellent alternative for the removal of Cr(VI) oxyanions, being endowed with fast kinetics, equilibrium in about 60 min, and a high level of reusability in successive sorption/desorption cycles.

EFFICIENCY OF CLEANING OF CHROME-CONTAINING WASTE WATER IN GALVANIC PRODUCTION

2020 ◽  
pp. 144-151
Author(s):  
L.N. Olshanskaya ◽  
I.A. Tiltigin ◽  
T.V. Osipova
Keyword(s):  
Waste Water ◽  
Comparative Analysis ◽  
Ion Exchange ◽  
Industrial Effluents ◽  
Promising Method ◽  
Combined Method ◽  
Galvanic Production

A promising method for purification of chromium-containing wastewater from galvanic plants is considered. A review and comparative analysis of existing methods and technologies for purifying industrial effluents from organochromic compounds: reagent, biological, ion-exchange, etc. are presented. The advantages of using the combined method of purification of chromium-containing wastewater based on electroflotation with preliminary electrocoagulation are shown. The effectiveness of the proposed combined method was evaluated and the scheme of the electroflotocoagulator was developed.

scholarly journals Investigation of the influence of electromagnetic field strength on the quality of water purification from heavy metals by ferritization method

2021 ◽  
pp. 4-10
Author(s):  
Bogdan Yemchura ◽  
Dmytro Pakhomov ◽  
Gennadii Kochetov ◽  
Dmytro Samchenko
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Electromagnetic Field ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Chromium Ions ◽  
Circulating Water ◽  
Industrial Enterprises ◽  
Quality Of Water ◽  
Degree Of Extraction

To date, one of the components of the global problem of water pollution has been the uncontrolled discharge of wastewater from industrial enterprises that use in their work technological solutions of heavy metals, including galvanic. Among the main components of wastewater generated in galvanic industrial enterprises, about 70% is zinc and its compounds, and the most toxic of the heavy metals contained in process solutions are Cr VI compounds. In view of this, it is important to improve the ferritization treatment of wastewater from zinc and chromium ions. A laboratory installation for the ferritization process with electromagnetic pulse activation (EMI) has been developed. This method of activation provides not only a reduction in energy costs, but also the appropriate degree of extraction of heavy metal ions, which allows you to get an aqueous solution that can be used in a circulating water supply system, and sludge disposed of as additives for alkaline cements. The influence of the strength of the electromagnetic field on the degree of extraction of zinc and chromium ions from wastewater by ferritization has been studied. It is determined that the best degree of purification from heavy metal ions is achieved at an electromagnetic field of 0.14T.

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