“…However, there is limited research on the use of SBC for P adsorption, possibly due to its low adsorption capacity for phosphate in wastewater, so modification of SBC is necessary. At present, there are modification methods such as inorganic salt treatment, inorganic acid-base treatment [ 14 ], activation [ 15 ], and other biomass impurities. Among them, metal impurity treatment is the most widely used, such as Al, Fe, Lanthanum (La) and other impurities, but it can cause further pollution, and the modification object is generally activated carbon or wooden biochar [ 10 , 16 , 17 ].…”