Complex formation of MnII with tetra(p-tert-butyl)thiacalix[4]arene acid in aqueous solutions of surfactants and polymers

Amirov, R. R.; Burilova, Evgenia A.; Ziyatdinova, A. B.; Zhuravleva, Yu. I.; Stoikov, Ivan I.; Антипин, И. С.

doi:10.1007/s11172-014-0415-z

Cited by 1 publication

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“…The purpose of converting TCA into TCAS was to introduce sulfonic groups to TCA molecular structure and make it water-soluble. 2 g of TCA and 80 mL of concentrated sulfuric acid were poured into a 100 mL beaker, and the temperature was controlled at 80 °C for 4 h. − The final extracted substance was TCAS with high purity.…”

Section: Experimental Methodsmentioning

confidence: 99%

Nanopore-Based Strategy for Sequential Separation of Heavy-Metal Ions in Water

Liu

Zhang

2018

Environ. Sci. Technol.

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Developing novel methods for the removal of heavy-metal ions from wastewater with low costs, special selectivity and high efficiency is quite important in water restoration and comprehensive ecological improvement. In this work, a nanopore-based strategy was suggested and related segregation apparatus was built to separate multiple heavy-metal ions in water by selective complexation. The results indicated that the prioritization of the selecting order for the complexing agent (thiacalix[4]arene- p-tetrasulfonate (TCAS)) to heavy-metal ions was Cu(II) > Cd(II) > Pb(II) > Ba(II). Meanwhile, higher driven voltage corresponded to a faster separation speed, while it could cause the decomposition of complexed heavy-metal ions when excessed the threshold. On the other hand, pH value would affect the hydrolysis of heavy-metal ions, the complexation of the calixarene to the heavy-metal ions and the speed of the electroosmotic flow. In our experiments, the maximum separation efficiency was achieved when the driven voltage was 1.5 V and the pH value was 5.0, corresponding to the best separation rate of 94.8%, 95.2%, 92.8%, 93.6%, for Cu(II), Cd(II), Pb(II) and Ba(II), respectively.

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Section: Experimental Methodsmentioning

confidence: 99%