Lanthanum (La)-based adsorbents have gained increasing attentions because of their intriguing characteristic for phosphate removal. This study developed a recyclable granular adsorbent—La modified bio-ceramisite (La@BC) through coprecipitation method and use it to remove phosphate from wastewater. Batch and column experiments were conducted to evaluate the performance of La@BC. The results showed that La@BC had a high phosphate adsorption capacity (136 mg P/g La), the adsorption process can be well described by Langmuir isotherm model and pseudo-second-order kinetic model. In addition, La@BC had a widely applicable pH range of 4-12, well selective adsorption performance in the presence of coexisting ions (Cl^-, NO_{- 3}, HCO_{- 3}, and SO_{2- 4}) and exhibited excellent recoverability and separability in five continuous adsorption-desorption cycles operation. Studying of removal mechanisms indicated that phosphate was successfully adsorbed by La@BC, and La-complex (LaPO₄) microprecipitation and electrostatic interaction may play a prominent role in phosphate removal. Column operation shown that La@BC adsorbents were highly efficient for phosphate removal. The all outlet phosphate concentrations were below 0.1 mg/L during a sixty-day monitoring period (inlet phosphate concentration was 1 mg/L). Because of superior removal capacity and good liquid-solid separability, granular La@BC adsorbent can efficiently avoid appreciable problems caused by powder adsorbent, and has a great potential for phosphate control in shallow eutrophic waters.

镧 (La) 基吸附剂因其去除磷酸盐的有趣特性而受到越来越多的关注。本研究通过共沉淀法开发了一种可回收的颗粒吸附剂——La改性生物陶粒（La@BC），并用它去除废水中的磷酸盐。进行批量和柱实验以评估 La@BC 的性能。结果表明，La@BC 具有较高的磷酸盐吸附能力（136 mg P/g La），吸附过程可以用朗缪尔等温线模型和准二级动力学模型很好地描述。此外，La@BC 具有广泛适用的 pH 范围 4-12，在共存离子（Cl ^-、NO _{- 3}、HCO _{- 3}和 SO_2-4 ) 并在五个连续的吸附-解吸循环操作中表现出优异的可回收性和可分离性。去除机理研究表明，La@BC 成功吸附了磷酸盐，La-复合物（LaPO ₄）微沉淀和静电相互作用可能在磷酸盐去除中起重要作用。柱操作表明，La@BC 吸附剂去除磷酸盐的效率很高。 60天监测期内所有出口磷酸盐浓度均低于0.1mg/L（入口磷酸盐浓度为1 毫克/升）。由于具有优异的去除能力和良好的液固分离性，颗粒状La@BC吸附剂可以有效避免粉状吸附剂引起的明显问题，在浅层富营养化水域中具有很大的磷酸盐控制潜力。