Biosorción de plomo (II) en solución acuosa con biomasa de los cladodios de la tuna (opuntia ficus indica); [Biossorção de chumbo (II) em solução aquosa com biomassa de cladódios de pera espinhosa (opuntia ficus indica)]

Lavado-Meza C.; Sun-Kou M.R.; Castro-Arroyo T.K.; Bonilla-Mancilla H.D. · Revista Colombiana de Quimica (2020) · DOI: 10.15446/rcq.v49n3.85823

Resumen

The removal of lead from aqueous solutions by the biomass of prickly pear cladodes (BCT), a species found in abundance in the Sierra region in Peru, was investigated. The physical and chemical properties of BCT were determined by FTIR and SEM/EDX techniques. The FTIR analysis confirmed the presence of –OH, C–O–C, C=O and –NH2 groups which would interact with the metal. The SEM micrograph revealed that the surface morphology of the BCT shows adequate porosity for biosorption. In a discontinuous system, the highest biosorption capacity (qe ) was obtained with a BCT mass/volume ratio of 4 g/L, pH 4.5 and 1 h of contact time. Biosorption followed a pseudo-second order kinetic model and the intraparticle diffusion process was the main factor controlling speed. Data at equilibrium were correlated using five models (Langmuir, Freundlich, Temkin, DR, and Redlich-Peterson) and were better fitted to the Langmuir model, which would indicate that the process is carried out in energetically homogeneous active centers, the value of qe maximum was 50.25 mg/g. The results obtained demonstrate that BCT can be used as an efficient biosorbent for the treatment of waters contaminated with Pb (II).

Instituciones: Pontificia Universidad Católica del Perú; Universidad Continental; Universidad Nacional del Centro del Perú