1. Acid/base regulated syntheses of different 1D coordination chains for selective mercury removal from aqueous solution.
- Author
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Li, Kaiyue, Han, Haitao, Zhang, Guoshuai, Zhu, Xiaofei, and Liao, Wuping
- Subjects
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AQUEOUS solutions , *MAGNETIC measurements , *ADSORPTION capacity , *MERCURY , *SORBENTS , *COBALT - Abstract
Two calixarene-based coordination chains were obtained solvothermally with a bridging ligand, 5-(4-Pyridyl)-1 H -1,2,4-triazole-3-thiol (L) upon the adding of triethylamine or concentrated HCl, namely, [(C 2 H 5) 3 NH] 2 [Co 4 (TC4A)(L) 2 (SO 4) 2 ]·5(CH 3 OH) (CIAC-256) and [Co 8 (TC4A) 2 (L) 2 (SO 4) 3 (CH 3 OH) 6 ]·2(C 3 H 7 NO)·3(CH 3 OH) (CIAC-257 ; H 4 TC4A = p -tert-butylthiacalix [4]arene). Both compounds are featured with some 1D wavy (or zigzag) chains. In CIAC-256 , the shuttlecock-like Co 4 -TC4A secondary building units (SBUs) are interconnected by the L ligands into the chains while in CIAC-257 , the SBUs are bridged by both the L ligands and the sulfonate anions. Both compounds are effective adsorbents for the selective removal of Hg(II) from the aqueous solution and the maximum adsorption capacities for Hg(II) are 411 mg/g for CIAC-256 and 307 mg/g for CIAC-257 , respectively. Magnetic measurements suggest that all the cobalt (II) centers exhibit antiferromagnetic interactions. [Display omitted] • Two 1D calixarene-based coordination chains were synthesized at different pH values. • All the cobalt (II) centers exhibit antiferromagnetic interactions. • Both compounds are effective adsorbents for selective Hg(II) removal. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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