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Issue 24, 2017
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Selective separation of aqueous sulphate anions via crystallization of sulphate–water clusters

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Abstract

In this study, the potential of oxoanion separation with the ligands N-4-methylbenzyl-4-amino-1,2,4-triazole (L1), N-4-fluorobenzyl-4-amino-1,2,4-triazole (L2), N-4-hydroxy benzyl-4-amino-1,2,4-triazole (L3), and N-3-methoxy-4-hydroxybenzyl-4-amino-1,2,4-triazole (L4) was explored. The salts of sulphate, nitrate, and perchlorate were crystallized in the form of [HL1]+[HSO4]·H2O, [HL2]+[HSO4]·H2O, 2[HL3]+[SO4]2−·2(H2O), and 2[HL4]+[SO4]2−·H2O, [HL3]+[NO3]·H2O and [HL4]+[NO3], and [HL3]+[ClO4] and [HL4]+[ClO4], respectively. Competitive crystallization and competitive sulphate-binding experiments demonstrated special recognition of the sulphate–water clusters (in the forms of [HSO4·H2O]n or [SO42−·H2O]n) via the parallel packed 3-D architectures of HL1+, HL2+, and HL4+ cations, which were far more effective and selective than the non-3-D structure of HL3+ cation. The observed selectivity for sulphate, nitrate, and perchlorate was found to be anti-Hofmeister. In addition, the selective separation of sulphate anions in seawater was investigated, which demonstrated the real-world application of the present strategy.

Graphical abstract: Selective separation of aqueous sulphate anions via crystallization of sulphate–water clusters

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Publication details

The article was received on 12 Apr 2017, accepted on 24 May 2017 and first published on 25 May 2017


Article type: Paper
DOI: 10.1039/C7CE00693D
Citation: CrystEngComm, 2017,19, 3362-3369
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    Selective separation of aqueous sulphate anions via crystallization of sulphate–water clusters

    Y. Luo, J. Wang, Y. Li, C. Chen, P. An, S. Wang, C. You and B. Sun, CrystEngComm, 2017, 19, 3362
    DOI: 10.1039/C7CE00693D

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