The use of Lessonia nigrescens as biosorbant for Arsenic(V) removal

Henrik K. Hansen, Adrian Rojo, Alexandra B. Ribeiro, Eduardo P. Mateus

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Conventional treatment methods for arsenic removal from copper smelting wastewaters create sludge that is difficult to handle. Biosorption of arsenic using algae as sorbent is an interesting alternative to the conventional methods. This work shows results from biosorption of arsenic (V) by Lessonia nigrescens at pH = 2.5, 4.5 and 6.5. The adsorption of arsenic could be explained satisfactorily both by the Freundlich and the Langmuir isotherms. Maximum adsorption capacities were estimated to 45.2 mg/g (pH = 2.5), 33.3 mg/g (pH = 4.5), and 28.2 mg/g (pH = 6.5) indicating better adsorption at the lower pH. These values are high in comparison with other arsenic adsorbents reported. The sorption kinetics of arsenic by Lessonia nigrescens could be modelled well by Lagergren's first order rate equation. The kinetics were observed to be independent of pH during the first 120 minutes of adsorption with the Lagergren first order rate constant of around 1.07-10-3 min-1.

Original languageEnglish
Title of host publicationCHISA 2006 - 17th International Congress of Chemical and Process Engineering
Publication statusPublished - 1 Dec 2006
EventCHISA 2006 - 17th International Congress of Chemical and Process Engineering - Prague, Czech Republic
Duration: 27 Aug 200631 Aug 2006

Conference

ConferenceCHISA 2006 - 17th International Congress of Chemical and Process Engineering
CountryCzech Republic
CityPrague
Period27/08/0631/08/06

Keywords

  • Environmental
  • Reclamation
  • Waste processing

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