| Apr 10, 2026 |
Researchers developed a biochar nanocomposite that removes tetracycline from water by adsorption and light driven breakdown, achieving over ninety percent removal and enabling reuse.
(Nanowerk News) Antibiotic contamination in water is a growing global concern, threatening ecosystems and human health. Now, researchers have developed a novel biochar-based nanocomposite that can efficiently remove the widely used antibiotic tetracycline from wastewater using a combination of adsorption and light-driven degradation.
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The study, published in Biochar (“Adsorptive-photocatalytic removal of tetracycline from wastewater by Fe3O4– and SnO2-containing biochar nanocomposites”), introduces a multifunctional material composed of wheat straw biochar integrated with iron oxide and tin dioxide nanoparticles. This innovative design enables the material to both capture and break down contaminants, offering a promising solution for sustainable water treatment.
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“Tetracycline is highly persistent in the environment and difficult to remove using conventional methods,” said the study’s corresponding author. “Our goal was to design a green, efficient, and reusable material that can not only adsorb antibiotics but also degrade them under light.”
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The researchers synthesized three variations of the nanocomposite by adjusting the ratio of iron and tin components. Among them, the optimized material achieved up to 91.8 percent removal of tetracycline within just three hours under light conditions. Even in real pharmaceutical wastewater, the removal efficiency remained high at over 82 percent, demonstrating strong practical potential.
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Unlike traditional treatment methods that simply transfer pollutants from water to another phase, this approach combines adsorption with photocatalysis, meaning contaminants are not only captured but also chemically broken down into less harmful substances. This reduces the risk of secondary pollution.
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The enhanced performance of the material comes from its unique structure. The biochar provides a porous surface with abundant functional groups that attract and bind antibiotic molecules. Meanwhile, the embedded nanoparticles improve light absorption and promote the generation of reactive species that drive chemical degradation.
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The study identified hydroxyl radicals and superoxide radicals as the key agents responsible for breaking down tetracycline molecules. These reactive species are generated when the material is exposed to light, triggering a cascade of reactions that ultimately convert pollutants into carbon dioxide, water, and inorganic ions.
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Importantly, the material is also reusable. After five cycles of use, it retained over 70 percent of its removal efficiency, highlighting its stability and potential for repeated applications.
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“Our composite takes advantage of both adsorption and photocatalysis, which work together to improve efficiency,” the author explained. “At the same time, the magnetic properties of iron oxide make it easy to separate and recover the material after treatment.”
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The use of agricultural waste such as wheat straw to produce biochar further enhances the sustainability of the approach. By converting low-value biomass into high-performance environmental materials, the technology aligns with circular economy principles and reduces overall costs.
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This research provides new insights into designing multifunctional biochar-based materials for environmental remediation. With its high efficiency, reusability, and ability to operate under visible light, the developed nanocomposite could offer a scalable solution for removing antibiotics and other emerging contaminants from water systems.
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As antibiotic pollution continues to rise worldwide, such innovations may play a crucial role in safeguarding water quality and public health.
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