African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6858

Full Length Research Paper

Removal of Cr (III) from contaminated water using industrial waste of the cassava as natural adsorbents

Daniel Schwantes
  • Daniel Schwantes
  • Pontifical Catholic University of Paraná (PUCPR), Brazil.
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Affonso Celso Gonçalves Jr.
  • Affonso Celso Gonçalves Jr.
  • State University of West Paraná (State University of West Paraná - UNIOESTE), Agrarian Science Center, Brazil.
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Juliana Casarin
  • Juliana Casarin
  • State University of West Paraná (State University of West Paraná - UNIOESTE), Agrarian Science Center, Brazil.
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Adílson Pinheiro
  • Adílson Pinheiro
  • Regional University of Blumenau (Regional University of Blumenau - FURB), Brazil.
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Ivone Gohr Pinheiro
  • Ivone Gohr Pinheiro
  • Regional University of Blumenau (Regional University of Blumenau - FURB), Brazil.
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Gustavo Ferreira Coelho
  • Gustavo Ferreira Coelho
  • Educational Faculty of Medianeira UDC. Medianeira, PR, Brasil, Brazil.
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  •  Received: 22 April 2015
  •  Accepted: 09 October 2015
  •  Published: 12 November 2015

Abstract

This innovative research aimed to study the potential of the use of solid wastes from cassava root processing industry (Manihot esculenta Crantz) (peel, bagasse and the mix peel + bagasse) as natural adsorbents of Cr3+ from waters. In a first step, the biosorbents were characterized chemically, structurally and morphologically. This way were performed infrared spectrum analysis, scanning electron microscopy, point of zero charge and chemical composition for all studied natural adsorbents. After that, studies evolving kinetics, equilibrium, thermodynamics and desorption of Cr3+ were performed. According to the obtained data the cassava adsorbents proved to be efficient in the removal of Cr3+, being found in Langmuir and D-R models the best fitting, indicating monolayer chemisorption, with endothermic character. The cassava materials presented lower rates of desorption also suggesting a chemisorption of Cr3+ molecules. By the obtained results it was concluded that the use of cassava biosorbents are viable for the decontamination of waters containing Cr3+, being the use of cassava wastes for adsorption a complementation of the final steps of cassava productive chain. 

 

Key words: Contamination of waters, chromium toxicity, biosorbents, natural adsorbents, remediation of waters, biosorption, decontamination of water.