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Belo Horizonte, Brazil

Mahamadi C.,Research and Postgraduate Center | Zambara P.,Bindura University of Science Education
European Journal of Scientific Research | Year: 2012

In this paper, we have presented the results of Cu(II) removal by alginateimmobilized water hyacinth beads. Batch equilibrium and kinetic experiments were conducted to determine maximum adsorption capacity under various experimental conditions. A sorption capacity of 61.0 mg/g was obtained using a biosorbent dose of 0.5 mg/l. The hyacinth-alginate beads formed were considerably resistant to swelling in acidic and aqueous media, but were less resistant in alkaline media. Sulphuric acid and calcium chloride solutions were effective desorbing agents, achieving up to 100% desorption, with the acid showing faster kinetics. Sorption capacity decreased slightly after 5 sorptiondesorption cycles indicating that both agents could be used as effective eluting agents. However, strong complexing agents such EDTA were found to be unsuitable for regeneration as they destroy the beads. In conclusion, entrapment of water hyacinth biomass in alginate improves both its sorption capacity and mechanical properties, thus presenting the biosorbent as a possible ingredient for continuous flow reactors. © EuroJournals Publishing, Inc. 2012. Source


Neves D.R.,Research and Postgraduate Center | Regis Jr. J.R.,Santa Casa Hospital of Belo Horizonte | E Oliveira P.J.V.,Research and Postgraduate Center | Zac R.I.,Service of Dermatology | And 2 more authors.
Anais Brasileiros de Dermatologia | Year: 2010

Piebaldism is a rare genodermatosis in which depigmented skin areas are unresponsive to topical or light treatment. This article describes the importance of transplant techniques using noncultured melanocytes (minigrafting) in the treatment of piebaldism. ©2010 by Anais Brasileiros de Dermatologia. Source

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