Thermochemical kinetics of the formation of supramolecular compounds of amino acids with carboxylic cation exchangers

Bondareva, L. P.; Ovsyannikova, D. V.; Селеменев, В. Ф.

doi:10.1134/s0036023610020257

Cited by 1 publication

(1 citation statement)

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“…[95][96][97][98], specific interactions between primary or secondary amines and acid residues of oxoacids play a key role in the self-organization of many native supramolecular structures. Probably, such interactions provide the high sorption capacity of anion-exchange resins with fixed phosphonate groups with respect to amino acids [99] and create a special architecture of the ion-exchange membrane surface upon layer-bylayer modification with polyallylamine and sulfonated polystyrene [100][101][102]. Analytical sensors based on these specific interactions are being actively developed [86][87][88], including phosphate-responsive nanofluidic diode [103] and polyamine-functionalized graphene field-effect transistors [101].…”

Section: Na X H (3−x) Po 4 Solutionsmentioning

confidence: 99%

How Chemical Nature of Fixed Groups of Anion-Exchange Membranes Affects the Performance of Electrodialysis of Phosphate-Containing Solutions?

et al. 2023

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Innovative ion exchange membranes have become commercially available in recent years. However, information about their structural and transport characteristics is often extremely insufficient. To address this issue, homogeneous anion exchange membranes with the trade names ASE, CJMA-3 and CJMA-6 have been investigated in NaxH(3−x)PO4 solutions with pH 4.4 ± 0.1, 6.6 and 10.0 ± 0.2, as well as NaCl solutions with pH 5.5 ± 0.1. Using IR spectroscopy and processing the concentration dependences of the electrical conductivity of these membranes in NaCl solutions, it was shown that ASE has a highly cross-linked aromatic matrix and mainly contains quaternary ammonium groups. Other membranes have a less cross-linked aliphatic matrix based on polyvinylidene fluoride (CJMA-3) or polyolefin (CJMA-6) and contain quaternary amines (CJMA-3) or a mixture of strongly basic (quaternary) and weakly basic (secondary) amines (CJMA-6). As expected, in dilute solutions of NaCl, the conductivity of membranes increases with an increase in their ion-exchange capacity: CJMA-6 < CJMA-3 << ASE. Weakly basic amines appear to form bound species with proton-containing phosphoric acid anions. This phenomenon causes a decrease in the electrical conductivity of CJMA-6 membranes compared to other studied membranes in phosphate-containing solutions. In addition, the formation of the neutral and negatively charged bound species suppresses the generation of protons by the “acid dissociation” mechanism. Moreover, when the membrane is operated in overlimiting current modes and/or in alkaline solutions, a bipolar junction is formed at the CJMA- 6/depleted solution interface. The CJMA-6 current-voltage curve becomes similar to the well-known curves for bipolar membranes, and water splitting intensifies in underlimiting and overlimiting modes. As a result, energy consumption for electrodialysis recovery of phosphates from aqueous solutions almost doubles when using the CJMA-6 membrane compared to the CJMA-3 membrane.

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