Pharmaceuticals and personal care products (PPCPs) like acetaminophen (ACT) and metronidazole (MET) are increasingly found in water sources, posing risks to ecosystems and human health. Conventional wastewater treatment methods often fall short in efficiently removing these pollutants. A new study explores an innovative solution: biochar derived from the invasive weed Parthenium hysterophorus.

Researchers synthesized two types of engineered biochar—acid-modified (HPC) and alkali-modified (KPC)—from the weed. These biochars were tested for their ability to adsorb ACT and MET from water in both single and mixed pollutant systems. The study utilized batch and fixed-bed column experiments to evaluate adsorption efficiency under various conditions, such as contact time, 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 pollutant concentration.

HPC, characterized by its microporous structure and larger surface area, demonstrated superior adsorption capacities compared to KPC, particularly in fixed-bed column setups. Both biochars performed well in removing PPCPs from multi-component systems, showing a synergistic effect where the presence of one pollutant enhanced the adsorption of the other.

The results underscore the potential of using biochar from invasive weeds as a cost-effective, eco-friendly method for treating wastewater. This approach not only mitigates water pollution but also helps manage the environmental impact of invasive species. By aligning with multiple Sustainable Development Goals, including clean water, sustainable consumption, and ecosystem preservation, this research offers a holistic strategy for addressing global environmental challenges.