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首页> 外文期刊>Environmental Science & Technology >Enhanced Arsenic Removal by Hydrothermally Treated Nanocrystalline Mg/AI Layered ouble Hydroxide with Nitrate Intercalation
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Enhanced Arsenic Removal by Hydrothermally Treated Nanocrystalline Mg/AI Layered ouble Hydroxide with Nitrate Intercalation

机译：硝酸盐插层水热处理纳米Mg / Al层状双氢氧化物增强除砷效果

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摘要

A nanocrystalline Mg/AI layered double hydroxide (FCHT-LDH) adsorbent was developed and investigated through stoichiometric calculations, nitrate displacement investigation, comprehensive sorption/desorption experiments, and analyses with XPS, XRD, FTIR, CHNS/O, and EDX for better understanding of the predominant nature of arsenate (As(V)) interaction with FCHT-LDH. FCHT-LDH demonstrated a higher sorption capacity and a faster sorption rate compared to the layered double hydroxides (LDHs) prepared by conventional methods, due to its higher surface area, better porosity characteristics, and nanocrystailine property. These results also indicated the important role of hydrothermal treatment during the synthesis process for enhanced As(V) removal. The observed nitrate-arsenate molar displacement ratio, increased interlayer spacing, and decreased nitrogen content in the interlayer region revealed the predominance of anion exchange mechanism in As(V) sorption by FCHT-LDH However, a slight pH increase during As(V) sorption equalization and the presence of ca. 25% irreversibly sorbed As(V) signified the occurrence of ligand exchange process as the secondary sorption mechanism. This specific sorption process that possibly involved formation of inner-sphere As(V) complexes with a monodentate mononuclear configuration at the aluminum center, rendered the FCHT-LDH a high affinity for As(V) over nitrate but induced hysteretic sorption/desorption characteristic that limited its regenerated sorption capacity.
机译：通过化学计量计算，硝酸盐置换研究，全面的吸附/解吸实验，并通过XPS，XRD，FTIR，CHNS / O和EDX分析，开发并研究了纳米Mg / Al层状双氢氧化物（FCHT-LDH）吸附剂。砷酸盐（As（V））与FCHT-LDH相互作用的主要性质。与通过常规方法制备的层状双氢氧化物（LDHs）相比，FCHT-LDH具有更高的吸附容量和更快的吸附速率，这是由于其较高的表面积，更好的孔隙率特性和纳米晶状丁二烯性能。这些结果还表明水热处理在合成过程中对增强As（V）去除的重要作用。观察到的硝酸盐-砷酸盐摩尔置换比，增加的层间间距和减少的中间层区域中的氮含量揭示了阴离子交换机理在FCHT-LDH吸附As（V）中的优势，但是，在As（V）吸附过程中pH略有增加均衡和ca的存在。 25％不可逆吸附的As（V）表示配体交换过程是次要吸附机制的发生。这种特定的吸附过程可能涉及在铝中心形成具有单齿单核构型的内球As（V）配合物，使FCHT-LDH对As（V）的硝酸盐具有很高的亲和力，但引起了滞后吸附/解吸特性，限制了其再生吸附能力。

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  • 来源
    《Environmental Science & Technology》 |2009年第7期|2537-2543|共7页
  • 作者

    KOK-HUI GOH; TEIK-THYE LIM; ZHILI DONG;

  • 作者单位

    School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore;

    School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore;

    School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore;

  • 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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