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Effect on physical and chemical characteristics of activated carbon on adsorption of trimethoprim: mechanisms study

机译：对甲基粒子吸附的活性炭物理和化学特性的影响：机制研究

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摘要

Five different types of activated carbon varying in porosity, structure, and functional groups were prepared and used as adsorbents. The effect of the key properties of each activated carbon on its adsorption capacity, rate and mechanisms on trimethoprim (TMP) removal were evaluated. The kinetics results suggested that chemical adsorption interactions and particle diffusion into micropores were the main rate-control steps for TMP adsorption, and the existence of mesopores promoted the diffusion of TMP into internal pores. The adsorption of TMP onto activated carbon can be attributed to the pore-filling effect (micropores and some narrow mesopores) and strong adsorptive interactions with the graphene surface or oxygenated groups. Regarding the surface area-normalized adsorption of TMP, porous activated carbon exhibited 50-500 times lower adsorption than nonporous carbon adsorbent due to the size-exclusion effect, especially when oxygen complexes presented on the edges of the pores of the activated carbon. From a system design point of view, a fast adsorption rate and high adsorption capacity are normally required, and these findings imply that activated carbon with high microporosity, a certain mesoporosity and approachable surface groups can have great application potential for TMP removal.
机译：制备五种不同类型的孔隙率，结构和官能团的活性炭，并用作吸附剂。评价每种活性炭对其吸附能力，速率和机制的效果评价氧吡啶（TMP）去除的吸附容量，速率和机制。动力学结果表明，化学吸附相互作用和粒子扩散到微孔中均对于TMP吸附主速率控制步骤，和中孔的存在促进了TMP扩散到内部的孔。将TMP的吸附在活性炭上可归因于孔填充效果（微孔和一些窄的中孔）和与石墨烯表面或含氧基团的强吸附相互作用。关于TMP的表面积归一化的吸附，多孔活性炭表现出50-500倍降低吸附比无孔碳吸附剂由于尺寸排阻效应，特别是当呈现在边缘上的氧络合物的活性炭的孔隙。从一个系统设计点，快速吸附率和较高的吸附能力通常需要，而这些发现暗示具有高微孔，有一定的中孔隙和可接近的表面基团的活性炭可具有用于TMP除去极大的应用潜力。

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  • 来源
    《RSC Advances》 |2015年第104期|共9页
  • 作者

    Liu Hai; Zhang Jian; Ngo Huu Hao; Guo Wenshan; Wu Haiming; Guo Zizhang; Cheng Cheng; Zhang Chenglu;

  • 作者单位

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

    Univ Technol Sydney Sch Civil &

    Environm Engn Broadway NSW 2007 Australia;

    Univ Technol Sydney Sch Civil &

    Environm Engn Broadway NSW 2007 Australia;

    Northwest A&

    F Univ Coll Resources &

    Environm Yangling 712100 Shaanxi Peoples R China;

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

    Shandong Univ Sch Environm Sci &

    Engn Shandong Key Lab Water Pollut Control &

    Resource Jinan 250100 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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