Separations of lanthanides and actinides using novel hybrid ion exchange materials, M(IV) phosphonates

Patel, Parimal; Chudasama, Uma

doi:10.1080/19443994.2013.808796

Cited by 10 publications

(2 citation statements)

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“…Together with Na + and K + , Mg 2+ and Ca 2+ are main cations in several natural waters and biological fluids. ,, Moreover, they are also important in technological/industrial fields, because they are responsible for the hardness of waters and for scale formation and they strongly affect the performances of all products containing chelating agents (detergents, hair colorants, and so on). − For all of these reasons, a comprehensive, systematic study of DTPMPA speciation in aqueous solutions could not neglect a study on the complexes formed by this ligand with both Mg 2+ and Ca 2+ . Therefore, some measurements were also performed in this work in NaCl(aq) at T = 298.15 K and different ionic strengths (0 < I /mol L –1 ≤ 1.0) in the presence of Mg 2+ or Ca 2+ .…”

Section: Resultsmentioning

confidence: 99%

“…This is true mainly for several reasons, such as (i) a strong structural relationship to natural compounds, together with a high stability and low toxicity; (ii) the ease of attaching the phosphonate group to organic moieties (favoring the synthesis of many diverse ligands); and (iii) the coordinating ability of phosphonic derivatives toward several metal cations . Among the most common organophosphonates, diethylenetriamine- N , N , N ′, N ″, N ″-pentakis(methylenephosphonic acid), DTPMPA (Chart ), is becoming a preferred chelant in many applications in which strong metal chelation is desired (see, e.g., refs − ), owing to the frequent absence of precipitation of some of its complexes over a wide pH range.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acid–Base Properties and Alkali and Alkaline Earth Metal Complex Formation in Aqueous Solution of Diethylenetriamine-N,N,N′,N″,N″-pentakis(methylenephosphonic acid) Obtained by an Efficient Synthetic Procedure

Cigala

Cordaro

Crea

et al. 2014

Ind. Eng. Chem. Res.

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Diethylenetriamine-N,N,N′,N″,N″-pentakis(methylenephosphonic acid) (DTPMPA) is used in a wide range of industrial applications, mainly because of its binding ability toward several metal cations. Because of difficulties in its synthesis and purification, very little reliable data have been reported in the literature about the coordination chemistry of this ligand in aqueous solution. For these reasons, in this article, we report an efficient procedure for the synthesis and purification of DTPMPA. The pure product obtained was used to determine its acid−base properties in different aqueous ionic media, namely, (C 2 H 5 ) 4 NI(aq), NaCl(aq), and KCl(aq), at 288.15 ≤ T/K ≤ 318.15 [only T = 298.15 K for KCl(aq)] by potentiometry (H + ionselective electrode, glass electrode) and at different ionic strengths (0 < I/mol L −1 ≤ 1.0). Measurements performed in alkali metal chlorides were also interpreted in terms of weak complex formation between DTPMPA and Na + and K + , and further measurements were also performed in NaCl(aq) at T = 298.15 K and different ionic strengths (0 < I/mol L −1 ≤ 1.0) in the presence of Mg 2+ or Ca 2+ , to determine the stability constants of species formed by DTPMPA and these cations. The protonation and complex-formation constants obtained at different ionic strengths and temperatures were modeled by different equations, providing all of the thermodynamic data necessary to define the solution behavior and the chemical speciation of DTPMPA under a wide number of variable conditions, such as those encountered in the very different industrial applications in which this chelating agent is used and those involving many natural fluids.

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