Frišták, V., Beliančínová, K., Polťáková, L. et al.Engineered Mg-modified biochar-based sorbent for arsenic separation and pre-concentration. Sci Rep14, 28680 (2024). https://doi.org/10.1038/s41598-024-79446-4

Researchers explored the effectiveness of magnesium-modified biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More (MgBC) for arsenic removal from water, comparing it to unmodified biochar (BC). Both sorbents were derived from cattail leaf biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More through pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More at 500°C. Chemical and physical analyses revealed distinct differences between BC and MgBC, including increased pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More and enhanced sorption capacity in the Mg-modified variant.

Sorption tests showed MgBC’s arsenic adsorption capacity to be 13.5 times higher than BC, with an optimal pH of 5-6 for arsenic binding. The study applied Langmuir, Freundlich, and Sips isotherms, finding the Sips model best described the sorption process. Additionally, MgBC’s performance proved robust against competing chloride ions but declined by 40% in the presence of phosphate ions.

The research highlighted MgBC’s reusability, achieving over 95% arsenic desorption using 0.1 M NaOH. It also demonstrated MgBC’s potential as a solid-phase extraction (SPE) column sorbent, retaining 35% arsenic under experimental conditions.

This work underscores Mg-modified biochar’s promise in arsenic removal and preconcentration, emphasizing the value of tailored biochar modifications for environmental remediation.