Química Nova (Jun 2014)

Remoção de compostos fenólicos de soluções aquosas utilizando carvão ativado preparado a partir do aguapé (Eichhornia crassipes): estudo cinético e de equilíbrio termodinâmico

  • Charles S. Barbosa,
  • Sirlane Aparecida Abreu Santana,
  • Cícero Wellington Brito Bezerra,
  • Hildo Antonio dos Santos Silva

DOI
https://doi.org/10.5935/0100-4042.20140066
Journal volume & issue
Vol. 37, no. 3
pp. 447 – 453

Abstract

Read online

Activated carbon was produced from the water hyacinth (CAA) by impregnation with ZnCl2 (1:2), followed by pyrolysis at 700 ºC, under N2. CAA was used for the adsorption of phenol, m-cresol and o-cresol from aqueous solutions, using batch adsorption. The effects of contact time, pH, temperature and concentration on sorption were investigated. Adsorption capacity, calculated using the Langmuir model proved to be dependent on temperature, reaching values of 163.7, 130.2 and 142.3 mg g-1 for phenol, m-cresol and o-cresol, respectively, at 45 ºC. Thermodynamic data at the solid-liquid interface suggests an endothermic, spontaneous and environmentally-friendly process.

Keywords