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首页> 外文期刊>Applied Surface Science >Enhanced removal of natural organic matters by calcined Mg/Al layered double hydroxide nanocrystalline particles: Adsorption, reusability and mechanism studies
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Enhanced removal of natural organic matters by calcined Mg/Al layered double hydroxide nanocrystalline particles: Adsorption, reusability and mechanism studies

机译：通过煅烧的Mg / Al层状双氢氧化物纳米晶颗粒增强对天然有机物的去除：吸附，可重复使用性和机理研究

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摘要

Natural organic matters (NOMs) can generate disinfection by-products during water treatment process, threatening to human health. However, the removal of NOM is still unsatisfactory in water treatment. Hence, this work investigated the removal efficiency of humic and fulvic acids (HA and FA) by layered double hydroxide (LDH) and its calcined forms under different conditions. Our results show that calcination of LDH at 500 degrees C can effectively enhance the NOM removal with adsorption capacities of 98.8 mg/g for HA and 97.6 mg/g for FA at pH 9.5. The removal efficiency of HA and FA notably increases by decreasing pH. The presence of SO42 and CO32- significantly suppresses the removal of HA or FA by CLDHs. The release of Al from LDH and CLDH is negligible and safe to aquatic organisms at pH 6.5. Moreover, CLDH shows a good reusability for NOM removal in water treatment. The removal of HA and FA by CLDH is governed through electrostatic interactions and intercalation into the interlayers of LDH was not observed. Fluorescence and molecular weight analyses show that the microbial by-products with mid-molecular weight are more difficult to be removed than HA and FA. This study provides a new insight into the NOM removal using LDH and CLDH. (C) 2018 Elsevier B.V. All rights reserved.
机译：天然有机物（NOMs）在水处理过程中会产生消毒副产物，威胁到人类健康。然而，去除NOM在水处理中仍然不能令人满意。因此，这项工作研究了层状双氢氧化物（LDH）及其煅烧形式在不同条件下对腐殖酸和富里酸（HA和FA）的去除效率。我们的结果表明，在500摄氏度下煅烧LDH可以有效增强NOM的去除，在pH 9.5时，对HA的吸附容量为98.8 mg / g，对于FA的吸附容量为97.6 mg / g。通过降低pH值，HA和FA的去除效率显着提高。 SO42和CO32-的存在会显着抑制CLDHs去除HA或FA。在pH> 6.5时，LDH和CLDH中Al的释放对于水生生物是微不足道的，并且是安全的。此外，CLDH对水处理中的NOM去除显示出良好的可重复使用性。 CLDH对HA和FA的去除是通过静电相互作用控制的，未观察到插入LDH的中间层。荧光和分子量分析表明，中等分子量的微生物副产物比HA和FA更加难以去除。这项研究为使用LDH和CLDH去除NOM提供了新的见解。 （C）2018 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2018年第1期|45-53|共9页
  • 作者

    Fang Liping; Hou Jingwei; Xu Cuihong; Wang Yaru; Li Ji; Xiao Feng; Wang Dongsheng;

  • 作者单位

    China Univ Geosci, Fac Mat Sci & Chem, Dept Chem, Wuhan 430074, Hubei, Peoples R China;

    China Univ Geosci, Fac Mat Sci & Chem, Dept Chem, Wuhan 430074, Hubei, Peoples R China;

    China Univ Geosci, Fac Mat Sci & Chem, Dept Chem, Wuhan 430074, Hubei, Peoples R China;

    China Univ Geosci, Fac Mat Sci & Chem, Dept Chem, Wuhan 430074, Hubei, Peoples R China;

    China Univ Geosci, Fac Mat Sci & Chem, Dept Chem, Wuhan 430074, Hubei, Peoples R China;

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China;

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Anionic clays; Adsorption process; Molecular weight distribution; Natural organic matters (NOMs);

    机译：阴离子粘土;吸附过程;分子量分布;天然有机物（NOMs）;

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