Biogenic phosphorus (P), such as organic P and inorganic pyrophosphates, could substantially contribute towards eutrophication in aquatic systems by internal loading of P from sediment through P species transformation. Previous eutrophication management studies mainly focus on the removal of orthophosphate (Ortho-P), however, an effective approach for biogenic P control from water sources, prior to incorporation in sediment, is still lacking. In this study, a lanthanum/aluminum-hydroxide (LAH) composite was demonstrated to provide both superior removal of Ortho-P and biogenic P, employing myo-inositol hexakisphosphate (IHP) and pyrophosphate (Pyro-P) as model compounds. The maximum IHP and Pyro-P adsorption capacities by LAH attained 36.4 and 21.8 mg P g-1, respectively. In order to understand the mechanisms of adsorption, zeta potential, 31P solid-state nuclear magnetic resonance (NMR) spectroscopy and P K-edge X-ray absorption near edge structure (XANES) techniques were used to characterize the LAH after adsorption. The results supported the hypothesis that the interaction between LAH and P species was through surface adsorption, by the formation of inner-sphere complexes. Linear combination fitting results of XANES data indicated that IHP and Pyro-P preferentially bonded with La-hydroxide in LAH. This study elucidates the adsorption properties and binding mechanisms of IHP and Pyro-P on lanthanum-bearing compounds at the molecular level, indicating that LAH is a promising material for the control of eutrophication.

中文翻译：

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镧/氢氧化铝复合物对生物磷的有效吸附的分子水平研究。

生物磷（P），例如有机磷和无机焦磷酸盐，可以通过沉积物中磷的内部负载，通过磷物种的转化，对水生系统富营养化做出重大贡献。以前的富营养化管理研究主要集中在正磷酸盐（Ortho-P）的去除上，但是，仍然缺乏有效的方法来控制水源中的生物磷，然后再将其掺入沉积物中。在这项研究中，镧/氢氧化铝（LAH）复合物被证明可以同时去除邻苯二甲酸和生物磷，采用肌醇六磷酸（IHP）和焦磷酸（焦磷酸）作为模型化合物。LAH的最大IHP和Pyro-P吸附容量分别达到36.4和21.8 mg P g-1。为了了解吸附机理，ζ电位，31P固态核磁共振（NMR）光谱和P K边缘X射线吸收近边缘结构（XANES）技术用于表征吸附后的LAH。该结果支持以下假设：LAH和P物种之间的相互作用是通过表面吸附，通过形成内球络合物来实现的。XANES数据的线性组合拟合结果表明，IHP和Pyro-P在LAH中优先与氢氧化镧键合。这项研究从分子水平阐明了IHP和Pyro-P在含镧化合物上的吸附特性和结合机理，表明LAH是控制富营养化的有前途的材料。