Adsorption of chromium (III) by waste orange raw and chemically modified

Adsorption of chromium (III) by waste orange raw and chemically modified

Authors

  • João Valdir Tadioto Miranda de Souza UNIVERSIDADE PARANAENSE - UNIPAR
  • Cristina Lorena Massocatto UNIVERSIDADE PARANAENSE - UNIPAR
  • Kristiany Moreira Diniz UNIVERSIDADE PARANAENSE - UNIPAR
  • César Ricardo Teixeira Tarley UNIVERSIDADE ESTADUAL DE LONDRINA - UEL
  • Josiane Caetano UNIVERSIDADE DO OESTE DO PARANÁ - UNIOESTE
  • Douglas Cardoso Dragunski UNIVERSIDADE PARANAENSE - UNIPAR

DOI:

https://doi.org/10.5433/1679-0375.2012v33n1p3

Keywords:

Adsorption, Chrome, Orange waste, Chemical modification

Abstract

The waste containing heavy metals originating from mining and industrial activities, can cause damage to the environment and human health. Although chromium is considered an essential metal, when found in high concentrations can be harmful. Therefore, the aim of this study was to investigate the efficiency of chemical treatments in husk, bagasse and bark with orange pulp, in order to treat wastewater aqueous contaminated by chromium (III). The modification refers to a treatment sodium hydroxide and citric acid, which aims at introducing carboxylate groups. Tests were conducted in batch systems containing chromium, and the concentrations were determined using the atomic absorption spectrophotometer flame. We analyzed the adsorption as a function of pH, contact time, metal concentration, the desorption capacity and thermodynamic parameters. The changes were observed in the infrared by the appearance of a peak at 1730cm-1, which refers to carboxylate groups. The time required to reach the adsorption system balance was approximately 500 minutes and the kinetics follows a behavior described by the equation of pseudo-second order. Was evaluated in relation to the adsorption models of Langmuir and Freundlich, being the model of Freundlich the best applied to the process. Besides increasing the adsorbent properties, the system became more spontaneous after the chemical treatment, verified by the low values of Gibbs energy.

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Author Biographies

João Valdir Tadioto Miranda de Souza, UNIVERSIDADE PARANAENSE - UNIPAR

Graduado em Química e Mestre em Biotecnologia Aplicada à Agricultura, Universidade Paranaense;

Cristina Lorena Massocatto, UNIVERSIDADE PARANAENSE - UNIPAR

Graduada em Farmácia e aluna de mestrado em Biotecnologia Aplicada à Agricultura, Universidade Paranaense;

Kristiany Moreira Diniz, UNIVERSIDADE PARANAENSE - UNIPAR

Graduada em Química e aluna de mestrado em Química, Universidade Estadual de Londrina

César Ricardo Teixeira Tarley, UNIVERSIDADE ESTADUAL DE LONDRINA - UEL

Docente do Curso de Química, Universidade Estadual de Londrina

Josiane Caetano, UNIVERSIDADE DO OESTE DO PARANÁ - UNIOESTE

Docente do Curso de Química, Universidade Estadual do Oeste do Paraná

Douglas Cardoso Dragunski, UNIVERSIDADE PARANAENSE - UNIPAR

UNIVERSIDADE PARANAENSE - UNIPAR
Professor do Mestrado em Biotecnologia Aplicado à Agricultura
Professor dos Cursos de Química, Farmácia e Engenharia Agronômica

Published

2012-04-25

How to Cite

de Souza, J. V. T. M., Massocatto, C. L., Diniz, K. M., Tarley, C. R. T., Caetano, J., & Dragunski, D. C. (2012). Adsorption of chromium (III) by waste orange raw and chemically modified. Semina: Ciências Exatas E Tecnológicas, 33(1), 3–16. https://doi.org/10.5433/1679-0375.2012v33n1p3

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Original Article

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