This study aimed to prepare biochars from various biomass waste including banana peels (BPB), orange peels (OPB), and peanut husk (PHB), to study their physiochemical properties and adsorption/desorption of lead (Pb) and chromium (Cr) from mining and industrial contaminated soil. Fourier transmission infrared microscopy and scanning electron microscopy analysis of biochars revealed a broad range of surface functional groups and variation in surface morphology. Soil pH and electrical conductivity were significantly increased upon the application of biochars at 5%, which was attributed to high adsorption of potentially toxic elements (PTEs). The maximum adsorption of Pb and Cr was recorded at the application rate of 5% biochars after 60 days of incubation experiment. Freundlich model analysis indicated the Pb and Cr adsorption, with R2 values of 0.950 and 0.999 for BPB and OPB (mining soil) and 0.996 for PHB (industrial soil). The desorption capacities of biochars were found to be lower at 5% application rates, whereas high desorption was observed at 15 days of incubation. The findings of the current research work suggested that agro-waste-derived biochars act as an affordable and efficient adsorbent for the removal of PTEs from contaminated soil. However, extensive research is required for developing standards for the large-scale application of biochars on contaminated soil, including feedstock selection, application dose, desorption of PTEs, change in physicochemical properties, mechanism of biochar ageing, and economic analysis for soil remediation.
Adsorption-desorption nexus of biowaste-derived biochars towards potentially toxic elements: Unveiling challenges and paving paths for the large-scale mining and industrial soil applications
Magazzino, Cosimo;
2026-01-01
Abstract
This study aimed to prepare biochars from various biomass waste including banana peels (BPB), orange peels (OPB), and peanut husk (PHB), to study their physiochemical properties and adsorption/desorption of lead (Pb) and chromium (Cr) from mining and industrial contaminated soil. Fourier transmission infrared microscopy and scanning electron microscopy analysis of biochars revealed a broad range of surface functional groups and variation in surface morphology. Soil pH and electrical conductivity were significantly increased upon the application of biochars at 5%, which was attributed to high adsorption of potentially toxic elements (PTEs). The maximum adsorption of Pb and Cr was recorded at the application rate of 5% biochars after 60 days of incubation experiment. Freundlich model analysis indicated the Pb and Cr adsorption, with R2 values of 0.950 and 0.999 for BPB and OPB (mining soil) and 0.996 for PHB (industrial soil). The desorption capacities of biochars were found to be lower at 5% application rates, whereas high desorption was observed at 15 days of incubation. The findings of the current research work suggested that agro-waste-derived biochars act as an affordable and efficient adsorbent for the removal of PTEs from contaminated soil. However, extensive research is required for developing standards for the large-scale application of biochars on contaminated soil, including feedstock selection, application dose, desorption of PTEs, change in physicochemical properties, mechanism of biochar ageing, and economic analysis for soil remediation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
