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

2020 ◽  
Vol 242 ◽  
pp. 209
Author(s):  
Vasilii KURDIUMOV1 ◽  
Konstantin TIMOFEEV ◽  
Gennady MALTSEV ◽  
Andrey LEBED
Keyword(s):  
Cation Exchanger ◽  
Ferrous Metal ◽  
Exchange Capacity ◽  
Separation Coefficient ◽  
Static Exchange Capacity ◽  
Manganese Ions ◽  
Subsequent Formation ◽  
Nickel Ions ◽  
Ph Range ◽  
Degree Of Extraction

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.

scholarly journals RESEARCH OF SORPTION CAPACITY OF CUTTING WASTE OF URBAN TREES IN RELATION TO DISSOLVED PETROLEUM PRODUCTS IN AQUATIC ENVIRONMENTS

2021 ◽  
pp. 33-39
Author(s):  
Svetlana V. Maksimova ◽  
◽  
Andrey A. Voronov ◽  
Keyword(s):  
Urban Areas ◽  
Petroleum Products ◽  
Exchange Capacity ◽  
Urban Trees ◽  
Oil Products ◽  
Static Exchange Capacity ◽  
Sorption Material ◽  
Degree Of Extraction ◽  
Poplar Sawdust

The article considers main problems associated with the treatment of surface wastewater in urban areas. This work addresses the task of searching for methods of extraction from aqueous solutions of petroleum products related to the main contamination of surface wastewater. Shredded waste from urban trees filing is an economical sorption material. Urban trees’ sawdust solves the problem of recycling tree branches. The authors describe of the experimental determination of oil capacity and static exchange capacity of maple and poplar sawdust, and show a dependence of the degree of extraction of oil products by phytosorbents on the contact time. The article concludes with assessment of applying urban trees filing waste as a sorption filters’ filling for cleaning surface wastewater from oil products.

scholarly journals The development of technology for production of zeolites from fly-ash from Troitskaya power plant

2021 ◽  
Vol 8 (1) ◽  
pp. 20218111
Author(s):  
V. A. Snegirev ◽  
V. M. Yurk
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
Pore Diameter ◽  
Silicon Oxide ◽  
Exchange Capacity ◽  
Static Exchange Capacity ◽  
Average Pore ◽  
Hydrochemical Synthesis ◽  
Bet Method ◽  
Zeolite Production

The study examines the technology of processing fly ash from Troitskaya power plant for the production of zeolite. The paper presents the results of laboratory studies evaluating the suitability of fly ash from Troitskaya power plant for the production of zeolites and the development of the zeolite production process. Fly ash contains a small amount of heavy metals that can complicate processing, but contains a large amount of silicon oxide. The technology consists of high-temperature alkaline activation of fly ash and hydrochemical synthesis. The resulting powder has a specific surface area of 89.7 m2/g, determined by the BET method, and an average pore diameter of 0.345 μm. The static exchange capacity was 220 mg/g.

Sorption of Anionic Pentachlorophenol (PCP) in Aquatic Environments: The Effect of pH

1992 ◽  
Vol 25 (11) ◽  
pp. 41-48 ◽  
Author(s):  
Y. Shimizu ◽  
S. Yamazaki ◽  
Y. Terashima
Keyword(s):  
Organic Carbon ◽  
Aqueous Phase ◽  
Cation Exchange Capacity ◽  
Clay Content ◽  
Exchange Capacity ◽  
Poor Correlation ◽  
Aquatic Environments ◽  
Organic Carbon Content ◽  
Swelling Clay ◽  
Ph Range

The sorption of pentachlorophenol (PCP, pKa’ = 4.75) onto natural solids from aqueous phase was investigated by batch sorption experiments. The experimental aqueous phase was prepared for set values of pH (2 to 12) and ionic strength (0.1 M). Experimental results indicated that the sorption decreased with increasing pH over the entire pH range tested. A simple mathematical model, based on the hypotheses that the sorption coefficients of non-ionized and ionized species are different and the pH has only negligible effect on the natural solid characteristics, was applied to the pH range between 6 and 8, and the sorption coefficients (Kd) of both species were estimated. The Kd of ionized species (phenolate anion) was smaller than that of non-ionized species. The Kd of both species had poor correlation to the organic carbon content of natural solids. The Kd, however, correlated well with the swelling clay content and cation exchange capacity of natural solids. These results indicated that the sorption of PCP was not controlled by the organic carbon referenced hydrophobic sorption. For broader pH range (i.e., below 6 or above 8), the dependence of the natural solid characteristics on pH must be additionally included in the model.

scholarly journals Solid phase selective separation and green preconcentration of Cu, Zn, Pb and Cd in drinking water by using novel functionalized resin

2009 ◽  
Vol 7 (4) ◽  
pp. 945-954 ◽  
Author(s):  
Nagwa Burham ◽  
Sami Azeem ◽  
Mohamed El-Shahat
Keyword(s):  
Drinking Water ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Exchange Capacity ◽  
Coupling Reactions ◽  
Lead And Cadmium ◽  
Sample Flow Rate ◽  
Relative Standard ◽  
Copper Zinc ◽  
Ph Range

AbstractA new solid — phase extraction sorbent was developed based on stepwise anchoring of two ligand molecules for the determination of copper, zinc, lead and cadmium in drinking water by flame AAS. Amberlite XAD-2 functionalized with 4′-(2-hydroxyphenylazo)-3′-methyl-1′-phenyl-2′-pyrazolin-5′-one (HPAPyr) was utilized for preconcentration/separation of these elements. The sorbent was prepared by two successive azo coupling reactions. First, 2-aminophenol was anchored to the amino groups in the resin resulted from nitration followed by reduction. Then, the resulted 2-aminophenol functionalized resin was further diazotized and coupled to the pyrazolone compound and the final product HPAPyr-XAD-2 was characterized by IR and elemental analysis. The optimum pH range for sorption, shaking time, exchange capacity, sample flow rate, preconcentration factor and interference from co-existing ions were investigated. All metal ions were quantitatively desorbed from the resin by 4.5 mol L−1 nitric acid solution. The sorbent provides limit of detection within the range 0.9–3.3 µg L−1 and concentration factor up to 250. The procedure was validated by analysis of certified material NIST-SRM 1577b. Application to drinking water showed satisfactory results with relative standard deviation RSD ≤ 8.5%.

scholarly journals Assessment of Novel Synthetized Nanozirconium Tungstovanadate as Cation Exchanger for Lead Ion Decontamination

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
M. F. Elkady ◽  
E. M. El-Sayed ◽  
H. A. Farag ◽  
A. A. Zaatout
Keyword(s):  
Ion Exchange ◽  
Cation Exchanger ◽  
Exchange Capacity ◽  
Molar Ratio ◽  
Lead Ion ◽  
Isotherm Models ◽  
Preparation Technique ◽  
Lead Uptake ◽  
Ion Exchange Capacity ◽  
Ion Sorption

A novel nanozirconium tungstovanadate that was assigned as a cation exchanger was synthetized using sol-gel preparation technique. The response of synthesis parameter variation on the properties of the produced ion exchanger was elucidated. The reactant molar ratio, gelation temperature, and HCl concentration have been optimized to attain cation exchanger with high ion exchange capacity and lead ion sorption. The most proper prepared sample has been chemically and physically characterized using different techniques. The ion exchange capacity of this sample was 2.5 meq/g and it recoded 96% lead ion sorption. The effects of the different processing parameters that affect lead sorption process have been investigated by a single factor method. Langmuir and Freundlich isotherm models were applied to the experimental data to examine the lead uptake mechanism.

scholarly journals SELECTIVITY OF INTERPOLYMER SYSTEMS WITH RESPECT TO LANTHANUM IONS

2021 ◽  
Vol 73 (1) ◽  
pp. 88-94
Author(s):  
T.K. JUMADILOV ◽  
◽  
L.K. Yskak ◽  
B. TOTKHYSKYZY ◽  
N.Zh. ZHAMBYLBAY ◽  
...  
Keyword(s):  
Polymer Chain ◽  
Maximum Degree ◽  
Cation Exchanger ◽  
Sorption Activity ◽  
Polymer Hydrogels ◽  
Lanthanum Ions ◽  
Sulfonic Cation Exchanger ◽  
Remote Interaction ◽  
Degree Of Extraction ◽  
Degree Of Sorption

The paper deals with the sorption of lanthanum ions by an interpolymer system consisting of sulfonic cation exchanger KU2-8 and anion exchanger AV-17-8. To predict the sorption activity of the intergel system, the mutual activation of the KU2-8 sulfonic cationite with the AV-17-8 anionite in the aqueous medium was initially studied. Due to the mutual activation of hydrogels in the course of their remote interaction, the polymer macromolecules pass into a highly ionized state, which leads to a significant increase in the degree of extraction of lanthanum ions from polymer hydrogels in intergel vapors as compared to the initial polymers. We calculated the degree of extraction of lanthanum ions by the interpolymer system KU2-8: AV-17-8, the degree of binding of the polymer chain (in relation to lanthanum ions) with the initial ion exchangers and the interpolymer system KU2-8: AV-17-8. Based on the data obtained, a comparative analysis of the sorption of lanthanum ions by individual sorbents and an interpolymer system was carried out within the limits of the ratio KU2-8: AV-17-8 = 5: 1–1: 5. It has been established that the maximum degree of sorption of lanthanum ions by the KU2-8: AV-17-8 interpolymer system is observed within the ratio KU2-8: AV-17-8 = 2: 4 at 48 hours of remote interaction of the interpolymer system and is 54.73 mol. %, at which the degree of binding of the polymer chain is 6.15%

scholarly journals Sorption And Physicochemical Properties of A Phosphorylated Mercerised Cotton Cellulose

2021 ◽  
Author(s):  
Roman Solovov ◽  
Anfisa Yu. Perevoznikova ◽  
Alexander F. Seliverstvov ◽  
Alexey V. Shapagin ◽  
Alexander M. Fedoseev ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Phosphorus Content ◽  
High Efficiency ◽  
Exchange Capacity ◽  
Spectrophotometric Analysis ◽  
Cotton Cellulose ◽  
Static Exchange Capacity ◽  
Cellulose Sample ◽  
Phosphorus Containing ◽  
Phosphoric Acid Concentration

Abstract A process of a mercerised cotton cellulose sample phosphorylation has been investigated. After oxidation a phosphorus content was determined by spectrophotometric analysis and it was in a range of 0.179 to 0.950 mmol g–1. A significant decrease in the tensile strength of the sample was found upon an increase of phosphoric acid concentration in a phosphorylating solution. Phosphorylated mercerized fabric contents more phosphorous as unmercerized fabric in 3 times. The sorption properties of phosphorylated cotton cellulose in aqueous solution containing Cu2+ were characterized. The maximum of static exchange capacity was found to be 1.48 ± 0.11 mmol g–1 for phosphorylated cotton with content 0.898 ± 0.090 mmol g–1 of phosphorus. The sorption of Cu2+ by single phosphorus-containing group occurs for samples with not exceeding 0.80 mmol g–1 of phosphorus. The preliminary studies of uranium(VI) micro quantities of radionuclides 241Am, 233U and 239Pu sorption from aqueous solution with phosphorylated textile demonstrated the high efficiency.

scholarly journals The analysis of physical and chemical efficiency of electroflotation process the removing products of hydrolysis titanium tetrachloride from technogenic effluents

2019 ◽  
Vol 486 (6) ◽  
pp. 680-684
Author(s):  
V. P. Meshalkin ◽  
A. V. Kolesnikov ◽  
D. S. Saveliev ◽  
V. A. Kolesnikov ◽  
A. Yu. Belozerskiy ◽  
...  
Keyword(s):  
Titanium Tetrachloride ◽  
Electrolyte Solutions ◽  
Industrial Wastes ◽  
Hydrolysis Products ◽  
Extraction Separation ◽  
Wide Ph Range ◽  
Ionic Nature ◽  
Ph Range ◽  
Degree Of Extraction ◽  
Physical And Chemical

The physicochemical efficiency of the electroflotation process for the extraction of TiCl4 hydrolysis products from aqueous electrolyte solutions was studied. They simulate the compositions of typical industrial wastes of metallurgical and metal-working industries that contain colloid-resistant compositions of titanium tetrachloride hydrolysis products, its oxides and hydroxides. The effect of various surfactants of anionic, cationic and non-ionic nature in a wide pH range (2-12) on the efficiency of electroflotation processes of extraction, separation and concentration of dispersed titanium (IV) compounds has been studied. It has been established that the electroflotation process of the extraction of hydrolysis products of TiCl4 proceeds quite effectively with a maximum degree of extraction of 98-99% (in the acidic region at pH = 3, in alkaline at pH = 8).

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