scholarly journals Assessment of the Total Volume Membrane Charge Density through Mathematical Modeling for Separation of Succinic Acid Aqueous Solutions on Ceramic Nanofiltration Membrane

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 559 ◽  
Author(s):  
Agata Marecka-Migacz ◽  
Piotr Tomasz Mitkowski ◽  
Jerzy Antczak ◽  
Jacek Różański ◽  
Krystyna Prochaska
Keyword(s):  
Mathematical Modeling ◽  
Ionic Strength ◽  
Aqueous Solutions ◽  
Succinic Acid ◽  
Ceramic Membrane ◽  
Ph Regulation ◽  
Nanofiltration Membrane ◽  
Charge Densities ◽  
Membrane Charge ◽  
Insight Into

Nanofiltration of aqueous solutions of succinic acid with the addition of sodium hydroxide or magnesium hydroxycarbonate has been investigated experimentally and modeled with the comprehensively described Donnan–Steric partitioning model. The experimental retentions of acid at the same pH varied between 16% and 78%, while the estimated total volume membrane charge densities were in the range of −35.73 and +875.69 mol/m3. This work presents a novel insight into the modeling of nanofiltration and investigates the relations between the estimated total volume membrane charge densities, ionic strength, and component concentration on the performance of ceramic membrane. In addition, this study takes into consideration other parameters such as pH regulation and viscosities of solutions.

scholarly journals Environmentally Friendly Complexones. The Thermodynamic Characteristics of the Formation of Al3+ Ion Complexes with Ethylenediaminedisuccinic Acid in Aqueous Solutions

2012 ◽  
Vol 7 (1) ◽  
pp. 70-73
Author(s):  
L.N. Tolkacheva ◽  
T.V. Saprunova ◽  
V.M. Nikol`skii ◽  
A.A. Yakovlev
Keyword(s):  
Mathematical Modeling ◽  
Ionic Strength ◽  
Complex Formation ◽  
Aqueous Solutions ◽  
Thermodynamic Characteristics ◽  
Environmentally Friendly ◽  
Individual Parameter ◽  
Thermodynamic Constants ◽  
Ethylenediaminedisuccinic Acid ◽  
Concentration Constants

Complex formation between Al3+ and ethylenediamine - N,N`-disuccinic acid (H4L) was studied at 25°C against the background of 0.1, 0.5, 1.0 N solutions of KNO3 by potentiometry and mathematical modeling. The extrapolation of concentration constants to zero ionic strength was used to calculate the thermodynamic constants of the formation of the AlL–, AlHL complexes using an equation with one individual parameter (logβ0 = 16.27 ± 0.07, 9.19 ± 0.2 respectively).

scholarly journals Separation and Concentration of Succinic Adic from Multicomponent Aqueous Solutions by Nanofiltration Technique

2014 ◽  
Vol 16 (2) ◽  
pp. 1-4 ◽  
Author(s):  
Jerzy Antczak ◽  
Justyna Regiec ◽  
Krystyna Prochaska
Keyword(s):  
Aqueous Solutions ◽  
Succinic Acid ◽  
Ceramic Membrane ◽  
Membrane Separation ◽  
Sodium Succinate ◽  
Model Solution ◽  
Transmembrane Pressure ◽  
Acid Salt ◽  
Selective Isolation ◽  
Initial Concentration

Abstract This paper applies the determined suitability of nanofiltration (NF) membrane separation for selective isolation and concentration of succinic acid from aqueous solutions which are post-fermentation multicomponent fluids. The study analyzed the influence of concentration and the pH of the separated solutions on the efficiency and selectivity of NF process that runs in a module equipped with a ceramic membrane. Moreover, the effect of applied trans-membrane pressure on the retention of succinic acid and sodium succinate has been studied. The investigations have shown that in the used NF module the retention of succinic acid salt is equal almost 50% in the case of a three-component model solution, although the degree of retention depends on both the transmembrane pressure and the initial concentration of separated salt.

scholarly journals Effect of pH on Total Volume Membrane Charge Density in the Nanofiltration of Aqueous Solutions of Nitrate Salts of Heavy Metals

Membranes ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 235
Author(s):  
Agata Marecka-Migacz ◽  
Piotr Tomasz Mitkowski ◽  
Arkadiusz Nędzarek ◽  
Jacek Różański ◽  
Waldemar Szaferski
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Mathematical Modelling ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Charge Density ◽  
Heavy Metal Ions ◽  
Charge Densities ◽  
Ph Values ◽  
Membrane Charge

The separation efficiencies of aqueous solutions containing nitric salts of Zn, Cu, Fe or Pb at various pH in process of nanofiltration have been investigated experimentally. These results were used to obtain the total volume membrane charge densities, through mathematical modelling based on the Donnan–Steric partitioning Model. The experimentally obtained retention values of individual heavy metal ions varied between 36% (Zn2+ at pH = 2), 57% (Pb2+ at pH = 2), 80% (Fe3+ at pH = 9), and up to 97% (Cu2+ at pH = 9). The mathematical modelling allowed for fitting the total volume membrane charge density (Xd), which yielded values ranging from −451.90 to +900.16 mol/m3 for different non-symmetric ions. This study presents the application of nanofiltration (NF) modelling, including a consideration of each ion present in the NF system—even those originating from solutions used to adjust the pH values of the feed.

Sorption of Cadmium and Lead by Chelating Ion Exchangers Ostsorb OXIN, Ostsorb DETA, and Ostsorb DTTA

1994 ◽  
Vol 59 (6) ◽  
pp. 1311-1318 ◽  
Author(s):  
Ladislav Svoboda ◽  
Petr Vořechovský
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Sodium Perchlorate ◽  
Exchange Capacity ◽  
Chloride Ions ◽  
Point Of View ◽  
Alkaline Media ◽  
Ion Exchangers ◽  
Acidic Media ◽  
Cadmium And Lead

The properties of cellulose chelating ion exchangers Ostsorb have been studied in the sorption of cadmium and lead from aqueous solutions. The Cd(II) and Pb(II) ions are trapped by the Ostsorb OXIN and Ostsorb DETA ion exchangers most effectively in neutral and alkaline media but at these conditions formation of stable hydrolytic products of both metals competes with the exchange equilibria. From this point of view, Ostsorb DTTA appears to be a more suitable sorbent since it traps the Pb(II) and Cd(II) ions in acidic media already. Chloride ions interfere with the sorption of the two metals by Ostsorb DTTA whereas the ionic strength adjusted by the addition of sodium perchlorate does not affect the exchange capacity of this ion exchanger.

Effect of ionic strength on the aggregation kinetics of the amidated amyloid beta peptide Aβ (1-40) in aqueous solutions

2017 ◽  
Vol 228 ◽  
pp. 98-107 ◽  
Author(s):  
Adriana Campos-Ramírez ◽  
Maripaz Márquez ◽  
Liliana Quintanar ◽  
Luis F. Rojas-Ochoa
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Amyloid Beta ◽  
Amyloid Beta Peptide ◽  
Aggregation Kinetics ◽  
Beta Peptide ◽  
Kinetics Of

scholarly journals Insight on Solution Plasma in Aqueous Solution and Their Application in Modification of Chitin and Chitosan

2021 ◽  
Vol 22 (9) ◽  
pp. 4308
Author(s):  
Chayanaphat Chokradjaroen ◽  
Jiangqi Niu ◽  
Gasidit Panomsuwan ◽  
Nagahiro Saito
Keyword(s):  
Aqueous Solutions ◽  
Atmospheric Pressure ◽  
Scientific Progress ◽  
Biological Properties ◽  
Environmental Concerns ◽  
Plasma Process ◽  
Renewable Materials ◽  
Chemical Structures ◽  
Chitin And Chitosan ◽  
Insight Into

Sustainability and environmental concerns have persuaded researchers to explore renewable materials, such as nature-derived polysaccharides, and add value by changing chemical structures with the aim to possess specific properties, like biological properties. Meanwhile, finding methods and strategies that can lower hazardous chemicals, simplify production steps, reduce time consumption, and acquire high-purified products is an important task that requires attention. To break through these issues, electrical discharging in aqueous solutions at atmospheric pressure and room temperature, referred to as the “solution plasma process”, has been introduced as a novel process for modification of nature-derived polysaccharides like chitin and chitosan. This review reveals insight into the electrical discharge in aqueous solutions and scientific progress on their application in a modification of chitin and chitosan, including degradation and deacetylation. The influencing parameters in the plasma process are intensively explained in order to provide a guideline for the modification of not only chitin and chitosan but also other nature-derived polysaccharides, aiming to address economic aspects and environmental concerns.

scholarly journals XVII.—Electrolytic Synthesis of Dibasic Acids

1895 ◽  
Vol 37 (2) ◽  
pp. 361-379
Author(s):  
A. Crum Brown ◽  
James Walker
Keyword(s):  
Aqueous Solutions ◽  
Succinic Acid ◽  
Homologous Series ◽  
Side Chains ◽  
Potassium Salts ◽  
Concentrated Aqueous Solutions

In our former paper we described the results obtained by electrolysing concentrated aqueous solutions of the ethyl-potassium salts of normal saturated dibasic acids. The chief products were shown to be diethyl compound ethers of the same homologous series, and the formation of these compound ethers was shown to occur in accordance with the equation: 2C2H5·O·ĊO·R˝·CO·O- = C2H5·O·CO·R˝R˝CO·O·C2H5 + 2CO2. We now find that precisely similar results are obtained by electrolysing the corresponding compounds derived from saturated dibasic acids with side chains. We have thus been able to effect the synthesis of acids of the succinic acid series, in which hydrogen is symmetrically replaced by alcohol radicals of the form CnH2n+1.

Highly efficient carbonaceous nanofiber/layered double hydroxide nanocomposites for removal of U(VI) from aqueous solutions

2019 ◽  
Vol 107 (4) ◽  
pp. 299-309
Author(s):  
Shuqi Yu ◽  
Xiangxue Wang ◽  
Shunyan Ning ◽  
Zhongshan Chen ◽  
Xiangke Wang
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Layered Double Hydroxide ◽  
Photoelectron Spectroscopy ◽  
Environmental Remediation ◽  
Three Dimensional ◽  
Order Kinetic ◽  
Surface Bonding ◽  
Double Hydroxide ◽  
Shed Light

Abstract The three-dimensional (3D) carbonaceous nanofiber and Ni-Al layered double hydroxide (CNF/LDH) nanocomposite was successfully prepared by a facile one-step hydrothermal methodology. Characterization of scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), XRD, and Fourier transformed infrared spectroscopy (FTIR) provided a demonstration that the modified CNF/LDH nanocomposite possessed abundant functional groups, for instance, metal-oxygen surface bonding sites (Ni–O as well as Al–O) and free-metal surface bonding sites (C–O, C–O–C, as well as O–C=O). The elimination of representative radionuclide (i.e. U(VI)) on the CNF/LDH nanocomposite from aqueous solutions was explored as a key function of pH, ionic strength, contact time, reaction temperature as well as radionuclide preliminary concentrations with the use of the batch methodology. As revealed by the findings, the sorption of radionuclides on CNF/LDH nanocomposite adhered to the pseudo-second-order kinetic model as well as Langmuir model. The maximum elimination capacity of U(VI) amounted to be 0.7 mmol/g. The independent of ionic strength shed light on the fact that inner-sphere surface complexation mainly overpowered radionuclide uptake by the CNF/LDH nanocomposite, which was further verified through the combination of FTIR and XPS spectral analyses. The abovementioned analyses shed light on the fact that the CNF/LDH nanocomposite can be regarded as a latent material to preconcentration radionuclides for environmental remediation.

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