scholarly journals Solubility Study and purification Of Industrial triple superphosphate in aqueous solution

2013 ◽  
Vol 9 (2) ◽  
pp. 1943-1952
Author(s):  
Khouloud Nasri ◽  
Chaker Chtara ◽  
Hassen Chekir ◽  
Hafed EL Feki
Keyword(s):  
Aqueous Solution ◽  
Ionic Conductivity ◽  
Calcium Phosphate ◽  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Chemical Fertilizer ◽  
Triple Superphosphate ◽  
Solubility Study ◽  
Different Temperatures ◽  
Insoluble Compounds

Triple Superphosphate (TSP) is a chemical fertilizer, acknowledged by its important content of phosphorus, necessary element for plants. It’s obtained by adding phosphoric acid to phosphate ore, consisting of calcium phosphate containing many impurities. TSP was dissolved at different temperatures and in various amounts of water, filtered to remove insoluble compounds. Then the ionic conductivity was monitored for each solution as a function of the added amount of TSP. Aqueous solutions were evaporated to dryness and analyzed the P2O5. The starting materials and final products were analyzed by several methods (XRD, IR, NMR, SEM) confirming that after dissolution the product was purified.

scholarly journals Removal of Nickel(II) from Aqueous Solutions by Adsorption with Modified ZSM- 5 Zeolites

2009 ◽  
Vol 6 (3) ◽  
pp. 729-736 ◽  
Author(s):  
P. Panneerselvam ◽  
V. Sathya Selva Bala ◽  
N. Thinakaran ◽  
P. Baskaralingam ◽  
M. Palanichamy ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Solute Concentration ◽  
Y Zeolite ◽  
Nickel Ion ◽  
Freundlich Model ◽  
Modified Zeolite ◽  
Equilibrium Modeling ◽  
Different Temperatures ◽  
Modeling Data

The sorptive removal of nickel ion from aqueous solutions using modified ZSM-5 zeolites was investigated. Experiments were carried out as a function of solute concentration and different temperatures. Mesoporous material of ZSM-5 zeolite was modified with phosphoric acid by wet method. The modified zeolite was converted to Na+form using aqueous NaHCO3solution. The Na+form of modified zeolite, represented as PNa2--ZSM-5 was characterized by XRD, BET, SEM and AAS techniques. It was then tested for ion exchange with aqueous Ni(SO4) solution. The Ni2+content of the solution was analyzed by AAS. Phosphoric acid modified PNa2--ZSM-5 zeolite shows higher adsorption capacity than the parent Na-Y zeolite. Equilibrium modeling data were fit to linear Langmuir model then the Freundlich model. These parameter confirmed that sorption of Ni2+is feasible spontaneous and endothermic.

scholarly journals Selective Transport of Ag(I) through a Polymer Inclusion Membrane Containing a Calix[4]pyrrole Derivative from Nitrate Aqueous Solutions

2020 ◽  
Vol 21 (15) ◽  
pp. 5348
Author(s):  
Anna Nowik-Zajac ◽  
Iwona Zawierucha ◽  
Cezary Kozlowski
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Aqueous Phase ◽  
Cellulose Triacetate ◽  
Inclusion Membrane ◽  
Selective Transport ◽  
Effective Transport ◽  
Different Temperatures ◽  
Nitrate Solutions

Cellulose-triacetate-based polymer inclusion membranes (PIMs) with different concentrations of a calixpyrrole ester derivative as the membrane carrier were studied to determine their ability to transport Ag(I) from aqueous nitrate solutions. The effects of the concentrations of ion carriers and metal ions, the pH of the source aqueous phase, and stripping agents on the effective transport of Ag(I) were assessed. All studied parameters were found to be important factors for the transport of Ag(I) metal ions. The initial fluxes were determined at different temperatures. The prepared membranes were found to be highly permeable. The selectivity of silver transport from an aqueous solution containing Ag(I), Cu(II), Pb(II), Cd(II), Ni(II), Zn(II), and Co(II) ions was also investigated.

Azobenzene based inorganic salts for light modulated ionic conductivity in aqueous solution

Soft Matter ◽  
2019 ◽  
Vol 15 (40) ◽  
pp. 7992-7995 ◽  
Author(s):  
Ning Kang ◽  
Peiqi Li ◽  
Shuai Tan ◽  
Caihong Wang
Keyword(s):  
Aqueous Solution ◽  
Ionic Conductivity ◽  
Aqueous Solutions ◽  
Inorganic Salts

Azobenzene based inorganic salts demonstrated light modulated ionic conductivity behaviors in aqueous solutions.

scholarly journals Synthesis of Polymer Inclusion Membranes based on Cellulose Triacetate for Recovery of Lanthanum(III) from Aqueous Solutions

2019 ◽  
Vol 19 (3) ◽  
pp. 288-292 ◽  
Author(s):  
Adam Makowka ◽  
Beata Pospiech
Keyword(s):  
Aqueous Solution ◽  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Polymer Matrix ◽  
Tributyl Phosphate ◽  
Cellulose Triacetate ◽  
Nitrophenyl Octyl Ether ◽  
Source Phase ◽  
Ion Carrier

Abstract Polymer inclusion membrane (PIM) containing cellulose triacetate (CTA) as a polymer matrix and 2-nitrophenyl octyl ether (NPOE) as a plasticizer was developed. This membrane also contained di(2-ethylhexyl)phosphoric acid (D2EHPA) and tributyl phosphate (TBP) as the carriers of metal ions. The facilitated transport of lanthanum(III) from aqueous nitrate(V) solutions across PIM was studied. It was observed that metal ions were transported from the source phase into 2M H2SO4 as the receiving phase. The transport through PIM with D2EHPA as the ion carrier was found as the more effective method of lanthanum(III) removal from the aqueous solution than transport through PIM with TBP as the ion carrier.

scholarly journals Thermodynamics of the Adsorption of Cobalt on Lead Dioxide from Aqueous Solution

1995 ◽  
Vol 12 (2) ◽  
pp. 139-149 ◽  
Author(s):  
H. Ahmad ◽  
M. Afzal ◽  
M. Saleem ◽  
S.M. Hasany
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Distribution Coefficient ◽  
Lead Dioxide ◽  
Optimum Conditions ◽  
Different Temperatures ◽  
Increasing Temperature

The adsorption of cobalt on lead dioxide from aqueous solutions has been optimized with respect to the shaking time, the amount of adsorbent, the pH and the concentration of adsorbate at 293 K. Under such optimum conditions, the adsorption of cobalt on lead dioxide has been studied at different temperatures and the process found to be endothermic with the distribution coefficient (KD) increasing with increasing temperature. The data fitted very well to the Langmuir, Freundlich and Dubinin–adushkevich isotherms, allowing the corresponding constants to be calculated. Values of ΔH0 and ΔS0 were calculated from the slope and intercept of the plots of In KD versus 1/T. The value of ΔG0, which decreased with increasing temperature, showed that the adsorption is more favourable at higher temperatures.

scholarly journals STANDARD FORMATION ENTHALPIES OF HYDROXYETHYLIDENEDIPHOSPHONIC ACID AND PRODUCTS OF ITS DISSOCIATION IN AQUEOUS SOLUTION

2018 ◽  
Vol 61 (4-5) ◽  
pp. 37
Author(s):  
Alexander I. Lytkin ◽  
Viktor V. Chernikov ◽  
Olga N. Krutova ◽  
Ivan A. Skvortsov
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Aqueous Solutions ◽  
Enthalpies Of Formation ◽  
Formation Enthalpies ◽  
Different Temperatures ◽  
Heat Value ◽  
Standard Enthalpies Of Formation ◽  
Changes Over Time ◽  
Stepwise Dissociation

This study aimed the measuring the standard enthalpies of formation of hydroxyethylidenediphosphonic acid and the products of its dissociation in aqueous solutions at 298.15 K. In the literature there is a large amount of data on the constants of stepwise dissociation of the acid. The works were done at different temperatures and the values of the ionic strength of the solution on the background of the different nature of the supporting electrolytes. In order to compare the values of the constants of stepwise dissociation of the acid, obtained by different authors, we recalculated the values of рK1, рK2, рK3, рК4, рК5 at zero ionic strength by the Davies equation. The most probable values of thermodynamic constants of dissociation of hydroxyethylidenediphosphonic acid were the following: рК10 = 1.7±0.03; рК20 = 2.47±0.05; рК30 = 7.78±0.05; рК40 = 10.29±0.05 and pK50 = 11.13±0.05. Calorimetric measurements were performed on an ampoule calorimeter equipped with an isothermal shell and a KMT-14 thermistor temperature sensor, and the automatic recording the temperature changes over time. The operation of installation was verified with the integral enthalpies of dissolution in water of crystalline potassium chloride and was considered suitable for measurements, if certain it ∆solН298.15 (KCl ∞ H2O)=17.234± 0.018 kJ/mol, corresponding to the standard SRM 1655NBS. The heat value of the calorimeter water was 87±12 Дж/mol virtually coincided with the thermal value of the calorimeter for potassium hydroxide. The volume of the calorimetric liquid was 43.12 ml. The hydroxyethylidenediphosphonic acid samples were weighed on a VLR-200 balance with 2∙10-4 g accuracy. The confidence range of the average ΔН value was determined at 0.95 probability. The equilibrium compositions of solutions were calculated using RRSU software. The standard enthalpies of formation of hydroxyethylidenediphosphonic acid and the products of its dissociation in aqueous solutions were calculated.Forcitation:Lytkin A.I., Chernikov V.V., Krutova O.N., Skvortsov I.A. Standard formation enthalpies of hydroxyethylidenediphosphonic acid and products of its dissociation in aqueous solution. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 4-5. P. 37-42

Adsorption of uranium from its aqueous solutions using activated cellulose and silica grafted cellulose

2020 ◽  
Vol 108 (4) ◽  
pp. 261-271 ◽  
Author(s):  
Mohamed N. Kouraim ◽  
Mohammed S. Hagag ◽  
Amr H. Ali
Keyword(s):  
Aqueous Solution ◽  
Exchange Rate ◽  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Sodium Metasilicate ◽  
Adverse Impact ◽  
Uranyl Sulfate ◽  
Anion Exchange Resins ◽  
Exchange Resins ◽  
Sulfate Complexes

AbstractThe present work provides a thorough description of the preparation of two cellulose anion exchange resins. In addition, the application of the prepared resins for treatment the uranium-contaminated wastewater. In the preparation, the first resin was cellulose reacted with 0.3 M HNO3 to produce Activated Cellulose (AC), while the second was AC treated with sodium metasilicate and phosphoric acid to yield Silica Grafted Cellulose (SGC). The efficiency of the two prepared resins for uranium adsorption from aqueous solution was testifying on a batch scale. In solutions of pH ranging from 4 to 7, results showed a high exchange rate and uptaking capacity up to 105 mg/g. However, the addition of NO3−, Fe3+ and Th4+ ions to the target media has an adverse impact on the uranium sorption for AC adsorbent. Otherwise, the addition of uranyl sulfate complexes could ameliorate Fe3+ and Th4+ adsorbed into the SGC.

Effect of thermal history of aqueous solutions of KCl on the metastable zone width

1984 ◽  
Vol 49 (3) ◽  
pp. 559-569 ◽  
Author(s):  
Jaroslav Nývlt
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Thermal History ◽  
Equilibrium Solubility ◽  
Metastable Zone Width ◽  
Zone Width ◽  
Preceding Experiment ◽  
History Of ◽  
Metastable Zone ◽  
The Given

The metastable zone width of an aqueous solution of KCI was measured as a function of the time and temperature of overheating above the equilibrium solubility temperature. It has been found that when the experiments follow close upon one another, the parameters of the preceding experiment affect the results of the experiment to follow.The results are interpreted in terms of hypotheses advanced in the literature to account for the effect of thermal history of solution. The plausibility and applicability of these hypotheses are assessed for the given cause of aqueous solution of a well soluble electrolyte.

Sorption of Lead by the Selective Ion Exchanger Ostsorb DETA

1992 ◽  
Vol 57 (7) ◽  
pp. 1393-1404 ◽  
Author(s):  
Ladislav Svoboda ◽  
Jan Uhlíř ◽  
Zdeněk Uhlíř
Keyword(s):  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Functional Groups ◽  
Ion Exchanger ◽  
Preconcentration Procedure ◽  
Bead Cellulose

The properties of Ostsorb DETA, a selective ion exchanger based on modified bead cellulose with chemically bonded diethylenetriamine functional groups, were studied, and its applicability to the preconcentration of trace amounts of lead from aqueous solutions was verified. The conditions of the preconcentration procedure in the column and batch modes were optimized for this purpose. The results obtained were applied to the determination of lead in phosphoric acid.

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