In this study, Mg and/or Al modified biochars (MABC¹, MBC², ABC³) prepared by co-precipitation were to explore their phosphate adsorption capacity from aqueous solution and the potential for soil phosphate interception. The results revealed that MABC composites contained more functional groups than MBC and showed a higher surface area than ABC. The surface of MABC contained dispersed MgAl₂O₄, Mg(OH)₂, AlOOH and Al₂O₃ crystals that were associated with its enhanced maximum phosphate adsorption capacity (153.40 mg g⁻¹). According to Langmuir model, the maximum adsorption capacity of MABC was 15.91, 1.85, and 93.54 times the capacity of MBC, ABC, and raw biochar (BC⁴), respectively. The addition of MABC in red soil could significantly slow down the release of soil phosphorus, and MABC also had a stronger phosphate interception capacity (59.89%) than other BCs. In summary, MABC exhibits superior phosphate adsorption and interception capacity, making it ideal for treatment and prevention of phosphorus-polluted water.

在这项研究中，通过共沉淀制备的Mg和/或Al改性生物炭（MABC ¹，MBC ²，ABC ³）将探讨其在水溶液中对磷酸盐的吸附能力以及对土壤磷酸盐的截留潜力。结果表明，MABC复合材料比MBC包含更多的官能团，并且比ABC具有更高的表面积。MABC的表面含有分散的MgAl ₂ O ₄，Mg（OH）₂，AlOOH和Al ₂ O ₃晶体，这与提高的最大磷酸盐吸附能力有关（153.40 mg g ^-1）。根据Langmuir模型，MABC的最大吸附容量分别是MBC，ABC和原始生物炭（BC ⁴）的容量的15.91、1.85和93.54倍。在红壤中添加MABC可以显着减缓土壤磷的释放，并且MABC还具有比其他BC更高的磷酸盐截留能力（59.89％）。总而言之，MABC具有优异的磷酸盐吸附和拦截能力，使其成为处理和预防磷污染水的理想选择。