Phosphate removal is an important measure to control eutrophication in aquatic environments, as it inhibits algal bloom. Salinity exists in these media along with high phosphate and currently available phosphate removal methods function poorly under this condition. In this study, the main objective is to fabricate a nanocomposite to improve and accelerate phosphate removal from saline solutions. To achieve this goal, Fe₃O₄/ZnO and a novel nanoadsorbent, Fe₃O₄/ZnO/CuO, were synthesized. Their characteristics were determined using FE-SEM, EDX, FT-IR, and XRD analyses, and their capability to adsorb phosphate from saline solutions was investigated and compared. The overall results suggest that the trimetallic oxide nanocomposite has great potential for the efficient removal of phosphate, in comparison with Fe₃O₄/ZnO. Experiments showed that Fe₃O₄/ZnO/CuO exhibited a remarkable sorption capacity of 156.35 mg P/g, fast sorption kinetic, strong selectivity for phosphate even in the presence of a high concentration of salinity (60 mg/L), and a wide applicable pH range of 3–6. Furthermore, using Fe₃O₄/ZnO/CuO, even a low dosage of 0.1 g/L was sufficient to reach an adsorption efficiency of 96.13% within 15 min compared to Fe₃O₄/ZnO (80.47% within 30 min). Moreover, the pseudo-second-order kinetic model best described the experimental adsorption data for both nanocomposites.

除磷是控制水生环境富营养化的重要措施，因为它可以抑制藻华。这些介质中存在盐分以及高磷酸盐，目前可用的磷酸盐去除方法在这种情况下效果不佳。在这项研究中，主要目标是制造一种纳米复合材料，以改善和加速盐溶液中磷酸盐的去除。为了实现这一目标，Fe ₃ O ₄ /ZnO 和一种新型纳米吸附剂 Fe ₃ O ₄/ZnO/CuO，合成。使用 FE-SEM、EDX、FT-IR 和 XRD 分析确定了它们的特性，并研究和比较了它们从盐水溶液中吸附磷酸盐的能力。总体结果表明，与 Fe ₃ O ₄ /ZnO相比，三金属氧化物纳米复合材料在有效去除磷酸盐方面具有巨大潜力。实验表明，Fe ₃ O ₄ /ZnO/CuO 表现出显着的吸附容量 156.35 mg P/g，吸附动力学快，即使在高浓度盐度（60 mg/L）的情况下，对磷酸盐的选择性也很强，并且适用的 pH 值范围为 3-6。此外，使用 Fe ₃ O ₄/ZnO/CuO，与 Fe ₃ O ₄ /ZnO（30 分钟内 80.47%）相比，即使是 0.1 g/L 的低剂量也足以在 15 分钟内达到 96.13% 的吸附效率。此外，伪二级动力学模型最好地描述了两种纳米复合材料的实验吸附数据。