Phosphate is a ubiquitous pollutant in aquatic systems, and increasingly stringent post-treatment phosphate effluent standards necessitate increasingly efficient removal techniques. In this study, mesoporous lanthanum hydroxide (MLHO) was synthesized by a hard-template method using ordered mesoporous silica, and its potential as an adsorbent for high-efficiency phosphate removal in aqueous solutions was tested. The porosity characteristics of MLHOs were controlled by adjusting the template structure and synthesis conditions. MLHO adsorbents showed great potential for phosphate removal from solutions containing both high and low initial phosphate concentrations. The phosphate adsorption capacity of MLHO strongly depended on its surface area as this process was governed by monolayer adsorption. Moreover, the phosphate removal performance of MLHO was affected by its structural properties. MLHO showed a high adsorption capacity of 109.41?mg P g ~(?1) at 28 °C ( q _(m) by the Langmuir isotherm model). Further, it showed ultrafast adsorption in a solution with low initial concentration of 2 mg P/L; within the first 10 min, 99.8% of phosphate was removed, and the phosphorus concentration remaining in the solution dramatically reduced to 4 μg P/L. These findings suggest that MLHO adsorbent is a good candidate for rapid and efficient low-concentration phosphate removal to meet the increasingly stringent discharge standards for wastewater treatment plants.
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机译：磷酸盐是水生系统中普遍存在的污染物，越来越严格的后处理磷酸盐废水标准要求越来越有效的清除技术。在这项研究中，使用有序介孔二氧化硅通过硬模板法合成了介孔氢氧化镧（MLHO），并测试了其作为高效去除水溶液中磷酸盐的吸附剂的潜力。 MLHOs的孔隙率特性可通过调整模板结构和合成条件来控制。 MLHO吸附剂显示出从含有高和低初始磷酸盐浓度的溶液中去除磷酸盐的巨大潜力。 MLHO的磷酸盐吸附能力在很大程度上取决于其表面积，因为该过程由单层吸附控制。此外，MLHO的除磷性能受其结构特性的影响。 MLHO在28°C下显示出高吸附能力，为109.41？mg P g〜（？1）（根据Langmuir等温模型，q_（m））。此外，它在初始浓度低至2 mg P / L的溶液中显示出超快吸附。在最初的10分钟内，去除了99.8％的磷酸盐，溶液中残留的磷浓度急剧降低至4μgP / L。这些发现表明，MLHO吸附剂是快速有效地去除低浓度磷酸盐的理想选择，以满足废水处理厂日益严格的排放标准。
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