Single and Binary Removals of Pb(II) and Cd(II) with Chemically Modified Opuntia ficus indica Cladodes.

Autor: Lavado-Meza C; Facultad de Ingeniería, Universidad Continental, Huancayo 12000, Peru., Fernandez-Pezua MC; Escuela Profesional de Ingeniería Ambiental, Universidad Nacional Intercultural de la Selva Central Juan Santos Atahualpa, Chanchamayo 12856, Peru., Gamarra-Gómez F; Laboratorio de Nanotecnología, Facultad de Ingeniería, Universidad Nacional Jorge Basadre Grohmann, Tacna 23003, Peru., Sacari-Sacari E; Laboratorio de Nanotecnología, Facultad de Ingeniería, Universidad Nacional Jorge Basadre Grohmann, Tacna 23003, Peru., Angeles-Suazo J; Facultad de Ingeniería Industrial, Universidad Tecnológica del Perú, Lima 15046, Peru., Dávalos-Prado JZ; Instituto de Química Física Rocasolano, CSIC, 28006 Madrid, Spain.
Jazyk: angličtina
Zdroj: Molecules (Basel, Switzerland) [Molecules] 2023 May 31; Vol. 28 (11). Date of Electronic Publication: 2023 May 31.
DOI: 10.3390/molecules28114451
Abstrakt: In this study, cladodes of Opuntia ficus indica (OFIC), chemically modified with NaOH (OFICM), have been prepared, characterized, and tested as an effective biomass to remove Pb(II) and/or Cd(II) from aqueous media. At an optimum pH of 4.5, the adsorption capacity, q e , of treated OFICM was almost four times higher than that of untreated OFIC. The maximum adsorption capacities (q max ) in the single removal of Pb(II) and Cd(II) were 116.8 and 64.7 mg g -1 , respectively. These values were 12.1% and 70.6% higher than those for the corresponding q max in binary removal, which indicates the strong inhibitive effect of Pb(II) on the co-cation Cd(II) in a binary system. Structural and morphological characterization have been carried out by FTIR, SEM/EDX, and point of zero charge (pH PZC ) measurements. The SEM/EDX results confirmed that the metals are adsorbed on the surface. The presence of C-O, C=O, and COO- functional groups were identified by FTIR on both OFIC and OFICM surfaces. On the other hand, we found that the adsorption processes followed the pseudo-second-order kinetics for both single and binary systems, with a fast biosorption rate of Pb(II) and Cd(II). The equilibrium data (adsorption isotherms) were better described by Langmuir and modified-Langmuir models for single and binary systems, respectively. A good regeneration of OFICM was obtained with an eluent of 0.1 M HNO 3 . Therefore, OFICM can be efficiently reused to remove Pb or Cd, up to three times.
Databáze: MEDLINE
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