Complexes of sodium and lithium borohydrides with macrocyclic polyethers

Tsivadze, А. Yu.; Дорохов, А. В.; Masanov, A. Yu.; Nikitin, E. V.; Votinova, N. A.

doi:10.1134/s1070328407080027

Cited by 1 publication

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References 4 publications

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“…For ACE/DA codeposited membranes and co-deposited products of ACE/PDA (spectra (e−g)), the peaks at approximately 1128 and 941 cm −1 correspond to the asymmetric stretching vibrations of C−O−C and the rocking vibration of −CH 2 − for the ether ring of ACE. 60 In addition, the N−H scissoring vibration of ACE around 1610 cm −1 (spectra (e,f)) becomes much weaker during ACE/DA codeposition on the membrane surface, possibly attributable to −NH 2 of ACE reacted with the catechol groups of PDA through Michael addition or Schiff base reaction.…”

Section: Ed Experimentsmentioning

confidence: 99%

Codeposition Modification of Cation Exchange Membranes with Dopamine and Crown Ether To Achieve High K⁺ Electrodialysis Selectivity

Yang

Liu

Liao

et al. 2019

ACS Appl. Mater. Interfaces

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Surface modification has been proven to be an effective approach for ion exchange membranes to achieve separation of counterions with different valences by altering interfacial construction of membranes to improve ion transfer performance. In this work, we have fabricated a series of novel cation exchange membranes (CEMs) by modifying sulfonated polysulfone (SPSF) membranes via codeposition of mussel-inspired dopamine (DA) and 4′-aminobenzo-15-crown-5 (ACE), followed by glutaraldehyde cross-linking, aiming at achieving selective separation of specific cations. The as-prepared membranes before and after modification were systematically characterized in terms of their structural, physicochemical, electrochemical, and electrodialytic properties. In the electrodialysis process, the modified membranes exhibit distinct perm selectivity to K+ ions in binary (K+/Li+, K+/Na+, K+/Mg2+) and ternary (K+/Li+/Mg2+) systems. In particular, at a constant current density of 5.0 mA·cm–2, modified membrane M-co-0.50 shows significantly prominent perm selectivity in the K+/Mg2+ system and M-co-0.75 exhibits remarkable performance in the K+/Li+ system , superior to commercial monovalent-selective CEM (CIMS, , ). Besides, in the K+/Li+/Mg2+ ternary system, K+ flux reaches 30.8 nmol·cm–2·s–1 for M-co-0.50, while it reaches 25.8 nmol·cm–2·s–1 for CIMS. It possibly arises from the effects of pore-size sieving and the synergistic action of electric field driving and host–guest molecular recognition of ACE and K+ ions. This study can provide new insights into the separation of specific alkali metal ions, especially on reducing influence of coexisting cations K+ and Na+ on Li+ ion recovery from salt lake and seawater.

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Section: Ed Experimentsmentioning

confidence: 99%

Codeposition Modification of Cation Exchange Membranes with Dopamine and Crown Ether To Achieve High K⁺ Electrodialysis Selectivity

Yang

Liu

Liao

et al. 2019

ACS Appl. Mater. Interfaces

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show abstract

Complexes of sodium and lithium borohydrides with macrocyclic polyethers

Cited by 1 publication

References 4 publications

Codeposition Modification of Cation Exchange Membranes with Dopamine and Crown Ether To Achieve High K⁺ Electrodialysis Selectivity

Codeposition Modification of Cation Exchange Membranes with Dopamine and Crown Ether To Achieve High K⁺ Electrodialysis Selectivity

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Complexes of sodium and lithium borohydrides with macrocyclic polyethers

Cited by 1 publication

References 4 publications

Codeposition Modification of Cation Exchange Membranes with Dopamine and Crown Ether To Achieve High K+ Electrodialysis Selectivity

Codeposition Modification of Cation Exchange Membranes with Dopamine and Crown Ether To Achieve High K+ Electrodialysis Selectivity

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About

Codeposition Modification of Cation Exchange Membranes with Dopamine and Crown Ether To Achieve High K⁺ Electrodialysis Selectivity

Codeposition Modification of Cation Exchange Membranes with Dopamine and Crown Ether To Achieve High K⁺ Electrodialysis Selectivity