Removal of some divalent cations from water by membrane-filtration assisted with alginate

Water Research
Nicolas Fatin-RougeAlain Foissy

Abstract

The removal of divalent metal ions from hard waters or galvanic wastewater by polymer-assisted membrane filtration using alginate was investigated. The ability of this natural polymer to form aggregates and gels in presence of metal ions was studied, in order to carry out metal removal by ultra or micro-filtration. Alginate titrations have shown the presence of amine groups in addition to carboxylates onto the polymer backbone. The binding properties of alginate with divalent cations have been studied, showing an increasing affinity for Ca2+ over Mg2+ as polymer concentration increases, and the relative affinity Pb2+ > or = Cu2+ > Zn2+ > Ni2+. The softening of hard natural waters was achieved successfully and easily, but needs an optimal alginate concentration approximately 4 x 10(-2) M. The alginate powder can be directly added to hard waters. Except for Ni2+, metal-removal was efficient. Polymer regeneration has shown that Cu2+-complexes are labiles.

References

Aug 2, 2001·Environmental Science & Technology·M E Romero-GonzalezP H Gardiner

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Citations

Nov 21, 2007·Applied Biochemistry and Biotechnology·Ricardo Lagoa, J R Rodrigues
Feb 7, 2016·International Journal of Biological Macromolecules·E VunainB B Mamba
Aug 1, 2014·Journal of Environmental Sciences (China)·Lijuan ZhaoJorge L Gardea-Torresdey
Jun 22, 2015·Journal of Hazardous Materials·A Nussinovitch, O Dagan
Aug 21, 2007·Journal of Colloid and Interface Science·Xiu-Wen WuZhi-Hong Li
Oct 1, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Joana M SilvaJoão F Mano
Apr 5, 2015·Ecotoxicology and Environmental Safety·Sarah CallegaroAntonio Marcomini
May 11, 2011·Water Environment Research : a Research Publication of the Water Environment Federation·Evina KatsouKatherine Haralambous

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