Phosphorus is an essential nutrient for biological growth, but its excessive presence in water can lead to eutrophication. Reducing phosphorus concentrations is an important way to prevent eutrophication of surface water bodies. In this study, a novel zero-valent manganese (ZVM) Mn⁰@Mn₂O₃ sorbent was synthesized via a facile one-step reduction method at ambient temperature. The morphology and surface properties of the Mn⁰@Mn₂O₃ were analyzed by Scanning electron microscopy (SEM), X-ray diffraction (XRD), Zeta potential analyzer, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The obtained amorphous sample consists of many small tremella-like particles. The as-prepared sorbent shows exceptional phosphate removal performance and has a maximum adsorption capacity of 113.7 mg-P/g at pH 7.0, superior to many reported adsorbents. The removal of phosphate is obviously pH-dependent and is favorable under near-neutral and weak-alkaline conditions (pH 6.5 to 8.5). The kinetics data fit well to the pseudo-second-order model. The coexisting SO₄^2-, CO₃^2- and Cl^- have no great influence on phosphate sorption, whereas, the SiO₃^2- shows negative effect at high concentration. The sorbent is effective for phosphate removal from real municipal wastewater. The results of ionic strength effect experiment, SEM, XRD, FTIR and XPS analyses reveal that the phosphate was mainly removed through surface precipitation and formation of inner-sphere surface complexes. The Mn⁰@Mn₂O₃ is a promising sorbent for phosphate removal from surface water and wastewater, owning to its exceptional performance, high selectivity, environmental friendliness and easy preparation.

磷是生物生长必不可少的营养素，但是磷在水中的过量存在会导致富营养化。降低磷浓度是防止地表水富营养化的重要途径。在这项研究中，一种新颖的零价锰（ZVM）Mn ⁰ @Mn ₂ O ₃吸附剂是通过一种简便的一步还原法在环境温度下合成的。Mn ⁰ @Mn ₂ O ₃的形貌和表面性质通过扫描电子显微镜（SEM），X射线衍射（XRD），Zeta电位分析仪，傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）进行了分析。所获得的无定形样品由许多小的银耳状颗粒组成。所制备的吸附剂显示出优异的磷酸盐去除性能，在pH 7.0下的最大吸附容量为113.7 mg-P / g，优于许多报道的吸附剂。磷酸盐的去除显然取决于pH值，在接近中性和弱碱性的条件下（pH 6.5至8.5）是有利的。动力学数据非常适合拟二阶模型。共存SO ₄ ^2-，CO ₃ ^2-和Cl ^-对磷酸盐吸附没有很大的影响，反之，在SiO₃ ^2-显示了在高浓度下的负面影响。该吸附剂可有效去除实际市政废水中的磷酸盐。离子强度效应实验，SEM，XRD，FTIR和XPS分析的结果表明，磷酸盐主要通过表面沉淀和内球表面配合物的形成而被除去。Mn ⁰ @Mn ₂ O ₃是一种有前途的吸附剂，可用于去除地表水和废水中的磷酸盐，因为它具有出色的性能，高选择性，环境友好和易于制备的优点。