A multifunctional adsorbent, silica modified with iminodisuccinic acid (IDS), was used for phosphorus removal for the first time. The IDS-silica adsorbent could be directly used in vegetable oils to convert nonhydratable phospholipids (NHPs) into hydratable phospholipids (HPs), thereby further removing phospholipids and other metal ions from the oil phase. The adsorbent chelated with metal ions (IDS-Fe³⁺-silica) could be used for the removal of phosphorus in the aqueous phase. In order to demonstrate the effectiveness of the multifunctional adsorbent, it was compared with the commonly used iminodiacetic acid (IDA)-silica adsorbent, and the phosphorus removal mechanisms in oil and aqueous phases were separately discussed. Whether applied in the oil or aqueous phase, IDS ligand adsorbents exhibited better phosphorus removal effects than IDA ligand adsorbents, especially in the aqueous phase, indicating that the effect of phosphorus removal depends on the number of coordination atoms of the ligand bonded on the adsorbent. In the oil phase, hydrating phospholipids with the IDS-silica adsorbent was proposed for the first time, in which coordination exists between the ligand and the metal ions adsorbed on NHPs. However, in the aqueous phase, the IDS-Fe³⁺-silica adsorbent removed inorganic phosphorus by coordination between Fe³⁺ chelated on the adsorbent and inorganic phosphorus.

中文翻译：

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用多功能吸附剂从油相和水相中去除磷

首次使用亚氨基二琥珀酸（IDS）改性的多功能吸附剂去除磷。IDS二氧化硅吸附剂可直接用于植物油中，将非水合磷脂（NHP）转化为水合磷脂（HPs），从而进一步从油相中去除磷脂和其他金属离子。吸附剂与金属离子螯合（IDS-Fe ³⁺-二氧化硅）可用于去除水相中的磷。为了证明多功能吸附剂的有效性，将其与常用的亚氨基二乙酸（IDA）-二氧化硅吸附剂进行了比较，并分别讨论了油相和水相中的除磷机理。无论是用于油相还是水相，IDS配体吸附剂均比IDA配体吸附剂表现出更好的除磷效果，尤其是在水相中，表明除磷效果取决于结合在吸附剂上的配体配位原子数。在油相中，首次提出用IDS二氧化硅吸附剂水合磷脂，其中配体与吸附在NHP上的金属离子之间存在配位作用。但是，在水相中，IDS-Fe^3+-二氧化硅吸附剂通过螯合在吸附剂上的Fe ³⁺与无机磷之间的配位而去除了无机磷。