Evaluation of Ocotea puberula bark powder (OPBP) as an effective adsorbent to uptake crystal violet from colored effluents: alternative kinetic approaches

The Ocotea puberula bark powder (OPBP) was evaluated as an effective adsorbent for the removal of crystal violet (CV) from colored effluents. OPBP was characterized and presented a surface with large cavities, organized as a honeycomb. The main functional groups of OPBP were O-H, N-H, C=O, and C-O-C. The adsorption of CV on OPBP was favorable at pH 9 with a dosage of 0.75 g L−1. The Avrami model was the most suitable to represent the adsorption kinetic profile, being the estimated equilibrium concentration value of 3.37 mg L−1 for an initial concentration of 50 mg L−1 (CV removal of 93.3%). The equilibrium was reached within 90 min. The data were better described by the Langmuir isotherm, reaching a maximum adsorption capacity of 444.34 mg g−1 at 328 K. The Gibbs free energy ranged from − 26.3554 to − 27.8055 kJ mol−1, and the enthalpy variation was − 11.1519 kJ mol−1. The external mass transfer was the rate-limiting step, with Biot numbers ranging from 0.0011 to 0.25. Lastly, OPBP application for the treatment of two different simulated effluents was effective, achieving a removal percentage of 90%.

• Autores: georgin, jordana; Franco, Dison; Schadeck Netto, Matias; Allasia, Daniel; Silva Oliveira, Marcos Leandro; Dotto, Guilherme Luiz
• Tipo de recurso: http://purl.org/coar/resource_type/c_816b
• Fecha de publicación: 2020
• Institución: Corporación Universidad de la Costa
• Repositorio: REDICUC - Repositorio CUC
• Idioma: eng
• OAI Identifier: oai:repositorio.cuc.edu.co:11323/6251
• Acceso en línea: https://hdl.handle.net/11323/6251; https://doi.org/10.1007/s11356-020-08854-6; https://repositorio.cuc.edu.co/
• Palabra clave: Adsorption; Biot number; Crystal violet; Mass transfer parameters; Ocotea puberula
• Rights: openAccess
• License: CC0 1.0 Universal