首页> 外文期刊>Journal of Hazardous Materials >Removal and recovery of phosphate and fluoride from water with reusable mesoporous Fe_3O_4@mSiO_2@mLDH composites as sorbents
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Removal and recovery of phosphate and fluoride from water with reusable mesoporous Fe_3O_4@mSiO_2@mLDH composites as sorbents

机译:以可重复使用的中孔Fe_3O_4 @ mSiO_2 @ mLDH复合材料为吸附剂从水中去除和回收磷酸盐和氟化物

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摘要

Three core/shell/shell MgAl-LDH composites using Fe3O4 microspheres as the core, a SiO2 matrix as the inner layer and a MgAl-LDH layer as the outer shell have been synthesized for the removal and recovery of phosphate and fluoride from water by a magnetic separation technique. The synthetic mesoporous MgAl-LDH composites show good magnetic separability, well-defined pore distributions, and have specific surface areas of 73 m(2) g(-1), 168 m(2) g(-1), and 137 m(2) g(-1) for Fe3O4@SiO2@LDH350, Fe3O4@SiO2@mLDH350, and Fe3O4@mSiO(2)@ mLDH350, respectively. The adsorption isotherms of both phosphate and fluoride on these MgAl-LDH composites can be well fitted with the Langmuir model. The maximum adsorption capacities of 57.07 mg g(-1) and 28.51 mg g(-1) were obtained on Fe3O4@mSiO(2) @mLDH350 for phosphate and fluoride, respectively, much higher than those of other LDH-type materials. The adsorbed phosphate and fluoride could be successfully recovered by NaNO3-NaOH solution, and the regenerated MgAl-LDH composites could be reused for phosphate and fluoride removal. Owing to their high adsorption capacities of both phosphate and fluoride, easy magnetic separation from solution, and good reusability, the mesoporous MgAl-LDH composites are expected to have potential applications in removal or recovery of fluoride or phosphate from water.
机译:合成了三种以Fe3O4微球为核,SiO2基体为内层,MgAl-LDH层为外壳的核/壳/壳MgAl-LDH复合材料,用于分离和回收水中的磷酸盐和氟化物。磁选技术。合成的介孔MgAl-LDH复合材料显示出良好的磁分离性,明确的孔分布,并且具有73 m(2)g(-1),168 m(2)g(-1)和137 m( 2)g(-1)分别用于Fe3O4 @ SiO2 @ LDH350,Fe3O4 @ SiO2 @ mLDH350和Fe3O4 @ mSiO(2)@ mLDH350。磷酸盐和氟化物在这些MgAl-LDH复合材料上的吸附等温线可以很好地拟合Langmuir模型。 Fe3O4 @ mSiO(2)@ mLDH350分别对磷酸盐和氟化物的最大吸附容量为57.07 mg g(-1)和28.51 mg g(-1),远高于其他LDH型材料。 NaNO3-NaOH溶液可成功回收吸附的磷酸盐和氟化物,再生的MgAl-LDH复合材料可用于磷酸盐和氟化物的去除。由于其对磷酸盐和氟化物的高吸附能力,易于从溶液中磁分离和良好的可重复使用性,中孔MgAl-LDH复合材料有望在从水中去除或回收氟化物或磷酸盐方面具有潜在的应用前景。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2020年第15期|121734.1-121734.13|共13页
  • 作者

  • 作者单位

    Nanjing Univ Informat Sci & Technol Collaborat Innovat Ctr Atmospher Environm & Equip Sch Environm Sci & Engn Jiangsu Key Lab Atmospher Environm Monitoring & P 219 Ningliu Rd Nanjing 210044 Peoples R China;

    Nanjing Univ Informat Sci & Technol Collaborat Innovat Ctr Atmospher Environm & Equip Sch Environm Sci & Engn Jiangsu Key Lab Atmospher Environm Monitoring & P 219 Ningliu Rd Nanjing 210044 Peoples R China|Univ Reading Dept Geog & Environm Sci Reading RG6 6DW Berks England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Adsorption; Fluoride; Phosphate; Mesoporous; LDHs;

    机译:吸附;氟化物;磷酸盐;中孔乳酸脱氢酶;

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