Pei, et al (2024) Adsorption Properties of Fishbone and Fishbone-Derived 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 for Cadmium in Aqueous Solution. Agronomy. https://doi.org/10.3390/agronomy14112717

Cadmium (Cd) pollution in water is a critical environmental challenge, primarily caused by industrial activities. A recent study explored the potential of fishbone and fishbone-derived biochar to address this issue. The biochar was produced by heating fishbone to various temperatures (200°C to 800°C) under controlled conditions.

The results revealed that fishbone biochar, especially when pyrolyzed at 600°C, significantly improved cadmium adsorption. Compared to untreated fishbone, the biochar’s ability to adsorb cadmium increased by up to 135%. This improvement was attributed to changes in the biochar’s surface area, pore structure, and chemical properties during high-temperature 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.

The study found that cadmium adsorption followed a pseudo-second-order kinetic model, indicating a chemical adsorption process. The adsorption mechanism involved pore filling, ion exchange with calcium on the biochar’s surface, and interactions with functional groups like hydroxyl and phosphate. The optimal 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 range for cadmium removal was between 6 and 8, ensuring minimal interference from other chemical reactions.

This research underscores the dual benefits of repurposing fishbone waste into a sustainable material for heavy metal remediation. Fishbone biochar not only helps clean contaminated water but also promotes the efficient use of an otherwise discarded resource. This innovative approach offers a promising, low-cost solution for addressing cadmium pollution in aquatic environments.