Phosphorus (P) in water is a growing problem, often leading to harmful algae blooms and water quality issues, known as eutrophication. To help combat this, a team of scientists has developed a new biochar material that effectively captures low concentrations of P from water.

They started with Canna indica straw (a common wetland plant) to create biochar, a carbon-rich material known for its ability to absorb pollutants. By adding lanthanum (LaCO3OH), they created a two-dimensional petal-like biochar that is far better at capturing phosphorus than traditional biochar. In fact, this modified version removes up to 99% of phosphorus in water, even at very low concentrations.

The biochar’s strength lies in its versatility. It works across a wide range of 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 levels (4.0 to 11.0) and maintains its effectiveness even when competing with other substances like chloride and nitrate. The material’s high absorption rate and stability make it an ideal solution for cleaning up lakes, reservoirs, and wastewater.

The study found that this La-modified biochar is not only effective in removing phosphorus but also safe for the environment. This breakthrough could be a significant step towards improving water quality and preventing the negative impacts of excess phosphorus on aquatic ecosystems.