Simultaneous removal of phosphorus (P) and algae is important to mitigate eutrophication, however, it is rather challenging in remediation of harmful algal blooms (HABs)-contaminated water. In this study, a wet alginate bead functionalized by CaO₂ particle formed layer by layer was prepared with an in-situ method and optimized to remove phosphorous and inhibit algae growth. The stable H₂O₂ release with a concentration level of 0.06 mM was observed for a period of 26 d. The content of peroxy groups (-O-O-) in the optimal bead was 0.44 mmol·g⁻¹ through permanganate-based titration study. For solution with an initial phosphorous concentration of 10 mg·L⁻¹, the removal was around 97% in pH 3.0–10.0. XRD, SEM, and XPS studies and kinetic modelings showed that removal of phosphorus was mainly due to formation of insoluble Ca-P compounds in the bead. The CaO₂-functionalized bead inhibited algae growth with an effect lasting over 170 d, which was much better than liquid H₂O₂ and Ca(OH)₂ bead; the phosphorous removal with an efficiency of about 70% was simultaneously obtained. Furthermore, the bead demonstrated to be effective in removing algae in the realistic water from a reservoir. In summary, this study shows that the CaO₂-functionalized material is promising for simultaneous removal of phosphorous and management of HABs.

同时去除磷 (P) 和藻类对于减轻富营养化很重要，但是，在修复受有害藻华 (HAB) 污染的水体方面颇具挑战性。在这项研究中，通过原位方法制备了由逐层形成的 CaO ₂颗粒功能化的湿藻酸盐珠，并对其进行了优化以去除磷并抑制藻类生长。在26 天的时间内观察到稳定的 H ₂ O ₂释放，浓度水平为 0.06 mM。通过基于高锰酸盐的滴定研究，最佳珠中过氧基(-OO-)的含量为0.44 mmol·g ^-1。对于初始磷浓度为 10 mg·L ^{-1 的}溶液，在 pH 3.0-10.0 时去除率约为 97%。XRD、SEM 和 XPS 研究和动力学模型表明，磷的去除主要是由于在珠粒中形成了不溶性 Ca-P 化合物。CaO ₂功能化珠抑制藻类生长，效果持续超过170 d，明显优于液态H ₂ O ₂和Ca(OH) ₂珠；同时获得了约 70% 的除磷效率。此外，该珠被证明可以有效地从水库中去除现实水中的藻类。总之，该研究表明，CaO ₂功能化材料有望同时去除磷和管理 HAB。