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首页> 外文期刊>Environmental Science & Technology >Removal of Phosphate from Eutrophic Lakes through Adsorption by in Situ Formation of Magnesium Hydroxide from Diatomite
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Removal of Phosphate from Eutrophic Lakes through Adsorption by in Situ Formation of Magnesium Hydroxide from Diatomite

机译:硅藻土中氢氧化镁原位吸附吸附去除富营养化湖泊中的磷酸盐

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摘要

Since in situ formation of Mg(OH)_2 can efficiently sorb phosphate (PO_4) from low concentrations in the environment, a novel dispersed magnesium oxide nanoflake-modified diatomite adsorbent (MOD) was developed for use in restoration of eutrophic lakes by removal of excess PO_4. Various adsorption conditions, such as pH, temperature and contact time were investigated. Overall, sorption capacities increased with increasing temperature and contact time, and decreased with increasing pH. Adsorption of PO_4 was well described by both the Langmuir isotherm and pseudo second-order models. Theoretical maximum sorption capacity of MOD for PO_4 was 44.44-52.08 mg/g at experimental conditions. Characterization of PO_4 adsorbed to MOD by use of X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and solid state ~(31)P nuclear magnetic resonance revealed that electrostatic attraction, surface complexation and chemical conversion in situ were the major forces in adsorption of PO_4. Mg(OH)_2 formed in situ had a net positive charge on the surface of the MOD that could adsorb PO_4~(3-) and HPO_4~(2-) anion to form surface complex and gradually convert to Mg_3(PO_4)_2 and MgHPO_4. Efficiency of removal of PO_4 was 90% when 300 mg MOD/L was added to eutrophic lake water. Results presented here demonstrated the potential use of the MOD for restoration of eutrophic lakes by removal of excess PO_4.
机译:由于Mg(OH)_2的原位形成可以有效地从环境中低浓度吸附磷酸盐(PO_4),因此开发了一种新型的分散的氧化镁纳米薄片改性的硅藻土吸附剂(MOD),用于通过去除多余的氧化物来恢复富营养化的湖泊。 PO_4。研究了各种吸附条件,例如pH,温度和接触时间。总体而言,吸附能力随温度和接触时间的增加而增加,而随pH值的增加而降低。 Langmuir等温线模型和伪二阶模型都很好地描述了PO_4的吸附。在实验条件下,MOD对PO_4的理论最大吸附容量为44.44-52.08 mg / g。利用X射线粉末衍射(XRD),X射线光电子能谱(XPS)和固态〜(31)P核磁共振对MOD吸附的PO_4进行表征,发现静电吸引,表面络合和原位化学转化是PO_4吸附的主要力量。原位生成的Mg(OH)_2在MOD的表面具有净正电荷,可以吸附PO_4〜(3-)和HPO_4〜(2-)阴离子形成表面配合物并逐渐转化为Mg_3(PO_4)_2和MgHPO_4。当向富营养化湖水中添加300 mg MOD / L时,去除PO_4的效率为90%。此处介绍的结果表明,通过去除过量的PO_4,MOD可以用于富营养化湖泊的修复。

著录项

  • 来源
    《Environmental Science & Technology》 |2014年第1期|582-590|共9页
  • 作者单位

    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China,CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China,Key Laboratory of Functional Molecule Design and Interface Process, School of Materials Science and Chemical Engineering, Anhui Jianzhu University, Hefei 230022, China;

    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;

    CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;

    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;

    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;

    State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;

    University of Saskatchewan, Department of Veterinary Biomedical Sciences and Toxicology Centre, 44 Campus Drive, Saskatoon, Saskatchewan, Canada, S7N 5B3;

  • 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);
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  • 正文语种 eng
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