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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Lanthanum-doped ordered mesoporous hollow silica spheres as novel adsorbents for efficient phosphate removal
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Lanthanum-doped ordered mesoporous hollow silica spheres as novel adsorbents for efficient phosphate removal

机译：掺杂镧的有序介孔中空二氧化硅球体是有效去除磷酸盐的新型吸附剂

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Lanthanum-doped ordered mesoporous hollow silica spheres were fabricated and utilized as phosphate adsorbents for the first time. Our prepared adsorbents exhibited spherical shapes with macropores in the center and ordered 2D hexagonal mesopores in the shell. By increasing the actual loading of La from 4.19 wt% to 22.44 wt%, the BET surface areas of the adsorbents decreased from 987.48 m~2 g~(-1) to 420.38 m~3 g~(-1), coupled with a decline in average pore diameters and total pore volumes. In the batch adsorption tests, the adsorbents with greater amounts of La loading possessed markedly enhanced adsorption capacities; in contrast, the un-doped pure ordered mesoporous hollow silica particles could hardly adsorb any phosphate in solution. The adsorption isotherms of the La-doped ordered mesoporous hollow silica spheres were represented better by using the Langmuir model than the Freundlich model. The sample with 22.44 wt% La loading exhibited a maximum phosphate capture capacity of 47.89 mg P g~(-1). In the kinetic study, its phosphate adsorption followed the pseudo-second-order model well. Moreover, a dramatically fast kinetic adsorption was observed in the solution with a low phosphorus concentration of 2 mg P L~(-1); the adsorption equilibrium was reached in 15 min, with a 99.71% phosphate removal rate. High adsorption capacities were achieved within the phi range 3.0 to 8.0; relatively high selectivity to phosphate was observed in the presence of coexisting anions.
机译：制备了镧掺杂的有序介孔中空二氧化硅球，并首次用作磷酸盐吸附剂。我们制备的吸附剂呈球形，中心有大孔，壳中有序的二维六角形中孔。通过将La的实际负载量从4.19 wt％增加到22.44 wt％，吸附剂的BET表面积从987.48 m〜2 g〜（-1）降低到420.38 m〜3 g〜（-1），并且平均孔径和总孔体积下降。在间歇式吸附试验中，La含量较高的吸附剂的吸附能力显着提高。相反，未掺杂的纯有序介孔中空二氧化硅颗粒几乎不吸附溶液中的任何磷酸盐。使用Langmuir模型比使用Freundlich模型更好地表示了La掺杂有序介孔中空二氧化硅球的吸附等温线。 La含量为22.44 wt％的样品的最大磷酸盐捕获量为47.89 mg P g〜（-1）。在动力学研究中，其磷酸盐吸附很好地遵循了伪二级模型。此外，在低磷浓度为2 mg P L〜（-1）的溶液中观察到了极快的动力学吸附。 15分钟内达到吸附平衡，磷酸盐去除率达99.71％。在phi范围为3.0至8.0的范围内实现了高吸附容量;在共存阴离子的存在下观察到对磷酸盐的较高的选择性。

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