Abstract
<title>Abstract</title> <p>Excessive phosphorus in water bodies is a key trigger for eutrophication, leading to algal blooms and explosive proliferation of aquatic plants. These blooms disrupt the structure and function of aquatic ecosystems, and produce potent hepatotoxins or neurotoxins, threatening drinking water safety and public health. This study prepared cerium oxide-modified biochar (Ce-BC) using bamboo as a raw material via a cerium oxide hydrothermal method and systematically evaluated its adsorption performance for phosphorus in water. The material was characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), N₂ adsorption-desorption, X-ray diffraction (XRD), and thermogravimetric analysis (TG). The FTIR analysis indicated the abundant presence of hydroxyl groups on the Ce-BC. The point of zero charge of Ce-BC was approximately 6.39. Adsorption experiments demonstrated that compared to BC, Ce-BC exhibited substantially improved adsorption capacity and rate for phosphorus. The adsorption kinetics followed the pseudo-second-order model, and the isotherm data were best fitted by the Dubinin-Radushkevich model, indicating an endothermic and spontaneous chemisorption process.</p>