RT journal article
T1 Ecofriendly Application of Calabrese Broccoli Stalk Waste as a Biosorbent for the Removal of Pb(II) Ions from Aqueous Media
A1 Granado Castro, María Dolores
A1 Galindo Riaño, María Dolores
A1 Gestoso Rojas, Jesús Alberto
A1 Sánchez Ponce, Lorena
A1 Casanueva Marenco, María José
A1 Díaz de Alba, Margarita Isabel
A2 Química Analítica
K1 lead
K1 broccoli stalk
K1 reuse of agricultural waste
K1 biosorption
K1 green
K1 sustainability
K1 sorption mechanisms
K1 aqueous polluted samples
AB A new biosorbent obtained from Calabrese broccoli stalks has been prepared, characterisedand used as an effective, low-cost and ecofriendly biomass to remove Pb(II) from aqueous solutions,without any complicated pretreatment. Structural and morphological characterisation wereperformed by TGA/DGT, FTIR and SEM/EDX; the main components are hemicellulose, starches,pectin, cellulose, lignin and phytochemicals, with important electron donor elements (such as S fromglucosinolates of broccoli) involved in Pb(II) sorption. The biosorbent showed values of 0.52 and0.65 g mL−1 for bulk and apparent densities, 20.6% porosity, a specific surface area of 15.3 m2 g−1,pHpzc 6.25, iodine capacity of 619 mg g−1 and a cation exchange capacity of 30.7 cmol kg−1. Verygood sorption (88.3 ± 0.8%) occurred at pH 4.8 with a biomass dose of 10 g L−1 after 8 h. TheFreundlich and Dubinin–Radushkevich isotherms and the pseudo-second-order kinetic models explainedwith good fits the favourable Pb(II) sorption on the heterogeneous surface of broccoli biomass.The maximum adsorption capacity was 586.7 mg g−1. The thermodynamic parameters evaluatedshowed the endothermic and spontaneous nature of the Pb(II) biosorption. The chemical mechanismsmainly involved complexation, ligand exchange and cation–π interaction, with possible precipitation.
PB MDPI
SN 2073-4395
YR 2024
FD 2024
LK http://hdl.handle.net/10498/33245
UL http://hdl.handle.net/10498/33245
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 05-nov-2026