A recent study introduces a breakthrough in water treatment technology with the synthesis of a novel porous manganese and nitrogen co-doped biochar (Mn-N@SBC). Utilizing loofah agricultural waste as the precursor and NaHCO3 as the activator, this one-step 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 process significantly enhances the specific surface area (SSA) and adsorption capacity of the biochar compared to direct manganese-nitrogen co-doping. The resulting Mn-N@SBC exhibits robust adaptability to a wide 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 (2–10) and various environmental factors, showcasing its potential for practical application in pollutant removal.

Traditional water treatment methods often fall short in effectively eliminating bisphenol A (BPA), a representative endocrine-disrupting chemical (EDC) prevalent in daily utensils. Recognizing the limitations, this study delves into the realm of adsorption as a promising technology for BPA removal. Biochar, derived from abundant agricultural waste, emerges as an ideal candidate due to its low cost and effectiveness.

The incorporation of nitrogen doping into the carbon framework of biochar enhances its surface characteristics, providing additional adsorption sites and increasing the SSA and pore volume. Similarly, the addition of manganese effectively inhibits aggregation and generates new active sites, further boosting the adsorption capacity. By utilizing NaHCO3 as an activator, the SSA of the biochar is significantly increased, enhancing its doping performance without causing corrosion or secondary pollution issues.

Moreover, this study employs a multi-faceted approach to elucidate the adsorption mechanisms at play. Through a combination of macroscopic experimental assessments, characterizations, and density functional theory (DFT) calculations, the intricate interactions between the adsorbent and BPA molecules are unveiled. The primary mechanisms identified include pore filling, hydrophobicity, and π-π-electron-donor–acceptor interaction.

In conclusion, the synthesis of Mn-N co-doped biochar represents a significant advancement in water treatment technology, offering a cost-effective and environmentally friendly solution for the removal of EDCs like BPA. This research not only provides practical guidance for pollutant removal but also contributes to our understanding of adsorption mechanisms at a microscopic level, paving the way for future innovations in environmental remediation.