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首页> 外文期刊>Journal of Hazardous Materials >Aminopropyl-modified mesoporous silica SBA-15 as recovery agents of Cu(II)-sulfate solutions: Adsorption efficiency, functional stability and reusability aspects
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Aminopropyl-modified mesoporous silica SBA-15 as recovery agents of Cu(II)-sulfate solutions: Adsorption efficiency, functional stability and reusability aspects

机译：氨基丙基改性的介孔二氧化硅SBA-15作为硫酸铜（II）溶液的回收剂：吸附效率，功能稳定性和可重复使用性方面

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摘要

Hybrid mesoporous materials are potentially useful for metal ion scavenging and retrieval because of their high surface areas, controlled accessibility and tailored functionalization. Some aspects that are linked to the performance of HMM include pore accessibility, stability of the organic functions and reusability. Knowledge of these aspects is critical in the design of adsorption-desorption protocols. In this work we produce and characterize propylamino-substituted large pore silica (SBA-15-N), which is submitted to Cu(II) adsorption from copper sulfate solutions, followed by desorption in acid media and material regeneration. We find that the hybrid material is an efficient adsorbent (1.15-1.75 mmol Cu(II) g~(-1)), although a fraction of the organic groups is lost during the adsorption process. An X-ray photoelectron spectroscopy (XPS) study demonstrates that the contents of amino groups are higher in the material surface, leading to different behaviors in Cu(II) complexation along the material. These materials can be regenerated by exposure to acidic media. Thermal processing of the hybrid materials leads to better durability in aqueous solutions during reprocessing, due to enhanced polycondensation of the inorganic framework. Thermally treated samples, once regenerated, are efficient adsorbents in a second step of Cu(II) adsorption. We discuss the materials processing factors involved in the improved adsorption of Cu(II), its quantitative release and reusability of the material.
机译：杂化介孔材料因其高表面积，可控制的可及性和量身定制的功能化，潜在地可用于金属离子的清除和回收。与HMM性能相关的一些方面包括孔可及性，有机功能的稳定性和可重复使用性。这些方面的知识对于吸附-解吸方案的设计至关重要。在这项工作中，我们生产并鉴定了丙基氨基取代的大孔二氧化硅（SBA-15-N），该二氧化硅将从硫酸铜溶液中吸附到Cu（II）上，然后在酸性介质中解吸并进行材料再生。我们发现杂化材料是一种有效的吸附剂（1.15-1.75 mmol Cu（II）g〜（-1）），尽管在吸附过程中有机基团的一部分损失了。 X射线光电子能谱（XPS）研究表明，材料表面的氨基含量较高，从而导致沿材料的Cu（II）络合行为不同。这些材料可以通过暴露在酸性介质中进行再生。由于增强了无机骨架的缩聚作用，对杂化材料进行热处理可在后处理过程中提高水溶液的耐久性。热处理后的样品一旦再生，便成为第二步吸附Cu（II）的有效吸附剂。我们讨论了与改善Cu（II）的吸附，其定量释放和材料的可重复使用性有关的材料加工因素。

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  • 来源
    《Journal of Hazardous Materials》 |2012年第15期|p.53-62|共10页
  • 作者

    M.V. Lombardo; M. Videla; A. Calvo; F.G. Requejo; G.J.A.A. Soler-Illia;

  • 作者单位

    Gerencia Quimica, Centra Atomico Constituyentes. CNEA. Av. General Paz 1499 (B1650KNA), San Martin. Buenos Aires, Argentina;

    Rhein Chemie Argentina. Luis Maria Drago 1555 - (B1852LGS) Burzaco. Buenos Aires, Argentina;

    1N1FTA-CONICET, Universidad Nacional de La Plata, CC 16Sucursal 4 (1900), La Plata, Argentina;

    1N1FTA-CONICET, Universidad Nacional de La Plata, CC 16Sucursal 4 (1900), La Plata, Argentina;

    Gerencia Quimica, Centra Atomico Constituyentes. CNEA. Av. General Paz 1499 (B1650KNA), San Martin. Buenos Aires, Argentina,DQIAyQF, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II (C1428EHA), Buenos Aires, Argentina;

  • 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
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  • 关键词

    mesoporous materials; ion scavenging; hybrid adsorbents; aminopropyl function; sol-gel; water treatment; reusable adsorbent;

    机译：介孔材料离子清除混合吸附剂氨丙基功能;溶胶凝胶水处理;可重复使用的吸附剂;

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