POLY(AMINOMETHYLENEPHOSPHONIC) ACID FOR SOLVENT EXTRACTION OF METAL IONS

Diaminododecyltetramethylenetetraphosphonic acid (DADTMTPA) has been investigated in liquid - liquid extraction of Zn (II) and Cu (II) in acetate media. The extraction of both cations was carried out in different media with the addition of CH3COONa, CH3COOH, HCl and H2SO4 at different pH values. The maximum extraction yield for copper is 70% after addition of 10 mg of sodium acetate and for zinc is 30% after addition of acetic acid at pHi = 5.5, in one step

Removal of chromium (III) by two-aqueous phases extraction

Two-aqueous phase extraction of chromium (III) as a solute from their aqueous solutions was investigated using polyethoxylated alcohols (CiEj) as a biodegradable non-ionic surfactant in the presence of anionic sodium dodecylbenzene sulfonate (SDBS). First, the combined effects of chromium and surfactants mixture (anionic and non-ionic) on the cloud point temperature were determined. After this, the phase diagrams of binary systems water–surfactant (NW342 and C10E3) were traced. According to the given surfactants concentration, the extracted solute reached 98.5% and 60% for NW342 and C10E3, respectively at pH equal to 3. The addition of sodium chloride lowers the cloud point temperature of surfactant where the phenomenon of salting-out was pronounced. Under the optimal extraction conditions, the suggested extraction mechanism is based on chromium species-NW342 non-ionic surfactant micelles solvatation. Since, the prevalence species (93.82%) were Cr(III)4(OH)66+, given by a theoretical calculation using CHEAQS V. L20.1. The first stage regeneration of NW342 surfactant was 27.82% at pH equal to 4.23 factorial designs were employed for screening the factors that would influence the overall optimization of a batch procedure of sorption

•ISBN-10 : 6202275863•ISBN-13 : 978-6202275866

International audienceThe present work addresses the students in chemistry, chemical engineering of the environment, as well as the specialists in chemistry of the phosphorus and the organophosphate compounds, in Hydrometallurgy both at the industrial level and at the level of the scientific research. This work aims to be a guide for the chemistry of the agent's complexants of types phosphonic & aminophosphonic acids, consisted widely used in the liquid-liquid extraction for the extraction of metals and rare earths, in the proceeding of ores and in the aqueous effluent treatments for the recovery and the valuation of rare earths, N-C-P in medicinal chemistry, pesticides/herbicides and water-decontamination systems, organometallic complexes: MOF, gas absorption, proton conductivity and Magnetic shielding tensors. Broché : 108 pages Editeur : Éditions universitaires européennes (15 janvier 2018) Langue : Anglai

Aminomethylenephosphonic Acids Syntheses and Applications (A Review)

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Wastewater Purification by Nanofiltration Technology

The removal of two different heavy metals in aqueous solutions was investigated with polyamide nanofiltration membrane SNTENF270-2540, the results show that the retention of iron ions was total (100%). Depending of the experimental conditions, the retentionof copper ions was varied from 82% to 94%. It was observed that the pH has no influence in the iron retention. The retention of ions bynanofiltration was done by Donnan effect (electrostatic repulsion) and counter-ion volume effect (steric exclusion)

SELECTIVE LIQUID-SOLID EXTRACTION OF Cr (III) FROM Cr (III) AND Fe (III) MIXTURE BY CHELEX 100 RESIN

This work focuses on the liquid-solid extraction of the mixture chromium (III) and iron (III) by the resin Chelex 100. The influence of operating parameters as equilibrium time (2 to 45 min), the initial pH of aqueous solution (1.06 to 3.97), effect of initial chromium (Ш) and iron (III) concentrations (100 to 500 ppm), effect of temperature (295 to 328 K) and the effect of ionic strength (NaCl, KNO3) was studied. The extraction yields of and the capacities of sorption of Cr (III) and Fe (III) by the resin Chelex 100 were determined at 64.94 and 87.30 % equivalent to 11.6 and 10.94 mg∙g-1 respectively. The equilibrium time was 45 and 5 min for initial concentrations of the mixture of Cr (III) and Fe (III) 500 mg∙L-1 respectively. The kinetic model of the pseudo second order describes the sorption process for the two metals. The separation of two metals is maximal at 100 mg∙L-1 and in the presence of KNO3 0.1 M. The thermodynamic study showed that the extraction process is exothermic (-29223 and -20735.1 kJ∙mol-1 for Cr (III) and Fe (III) respectively) and the negative ΔG values show that, the sorption of metals occurs spontaneously in 295 - 328 K, while it is not appropriate in case of Fe (III) as indicated by the positive sign of ΔG (96 kJ∙mol-1) at 309 K. The percentage of desorption is estimated to 57.6 % for both metals by the solution of HNO3 1 M. The experimental results obtained showed the validity of the liquid-solid extraction to be used for selective extraction and concentration of Cr (III) from the Cr (III) and Fe (III) mixture solutions

A new sorbent for uranium extraction: ethylenediamino tris(methylenephosphonic) acid grafted on polystyrene resin

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Investigation of 7-((dioctylamino)methyl)quinoline-8-ol for uptake and removal of uranyl ions

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Removal of uranium(VI) from acetate medium using Lewatit TP 260 resin

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Factorial design in optimization of extraction procedure for copper (II) using Aliquat 336 and Tri- n -butylphosphate based supported liquid membrane

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