@misc{10498/33245,
year = {2024},
url = {http://hdl.handle.net/10498/33245},
abstract = {A new biosorbent obtained from Calabrese broccoli stalks has been prepared, characterised
and used as an effective, low-cost and ecofriendly biomass to remove Pb(II) from aqueous solutions,
without any complicated pretreatment. Structural and morphological characterisation were
performed 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 from
glucosinolates of broccoli) involved in Pb(II) sorption. The biosorbent showed values of 0.52 and
0.65 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. Very
good sorption (88.3 ± 0.8%) occurred at pH 4.8 with a biomass dose of 10 g L−1 after 8 h. The
Freundlich and Dubinin–Radushkevich isotherms and the pseudo-second-order kinetic models explained
with 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 evaluated
showed the endothermic and spontaneous nature of the Pb(II) biosorption. The chemical mechanisms
mainly involved complexation, ligand exchange and cation–π interaction, with possible precipitation.},
publisher = {MDPI},
keywords = {lead},
keywords = {broccoli stalk},
keywords = {reuse of agricultural waste},
keywords = {biosorption},
keywords = {green},
keywords = {sustainability},
keywords = {sorption mechanisms},
keywords = {aqueous polluted samples},
title = {Ecofriendly Application of Calabrese Broccoli Stalk Waste as a Biosorbent for the Removal of Pb(II) Ions from Aqueous Media},
doi = {10.3390/agronomy14030554},
author = {Granado Castro, María Dolores and Galindo Riaño, María Dolores and Gestoso Rojas, Jesús Alberto and Sánchez Ponce, Lorena and Casanueva Marenco, María José and Díaz de Alba, Margarita Isabel},
}