TY  - JOUR
AU  - Romano, Melisa S.
AU  - Corne, Valeria
AU  - Azario, Ricardo R.
AU  - Centurión, Emiliano
AU  - García, María del Carmen
PY  - 2025
DA  - 2025/01/10
TI  - Valorization of Agroindustrial Waste as Biosorbent of Lead (II) in Solution and its Reuse in the Manufacture of Building Bricks
JO  - Recent Progress in Materials
SP  - 002
VL  - 07
IS  - 01
AB  - Lead is a non-biodegradable toxic heavy metal. Biosorption is a simple, cost-effective and eco-friendly method for remediating lead-contaminated environments. Additionally, rice husk is a highly available residual biomass that can be used as a biosorbent. This study aimed to analyze the biosorption of Pb2+ using both natural and chemically treated rice husk and to evaluate the incorporation of the resulting biomass-contaminant residue into ceramic matrices to immobilize the removed Pb2+. Natural and alkaline-activated rice husks were characterized and used as biosorbents for Pb2+ in solution. Experimental results demonstrated that the maximum removal occurred at pH 5 and equilibrium was reached in 30 minutes. The chemical modification caused a significant increase in the removal efficiency, from 7.08 ± 0.59% to 94.51 ± 1.17% at room temperature and a biosorbent dosage of 3 g/L. The Langmuir isotherm model was the most appropriate for representing Pb2+ biosorption onto rice husk. The maximum adsorption capacities (qm, mg/g) were 8.464 for natural rice husk and 27.450 for the chemically modified form. Biosorption data followed a pseudo-second-order kinetic model. Ceramic pieces were prepared by mixing commercial clay and rice husk containing adsorbed Pb2+, with the residue added at 10% by volume. Pb2+ fixation was assessed through ecotoxicity and leaching tests, which confirmed that ceramic pieces immobilized Pb2+ within their structure. In conclusion, the use of alkaline-treated rice husk as a Pb2+ biosorbent, combined with the incorporation of the biomass-Pb2+ residue into ceramic matrices for Pb2+ immobilization, provides an eco-friendly alternative for detoxifying lead-contaminated environments.
SN  - 2689-5846
UR  - https://doi.org/10.21926/rpm.2501002
DO  - 10.21926/rpm.2501002
ID  - Romano2025
ER  -