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p-Chlorophenol adsorption on activated carbons with basic surface properties

机译：对氯苯酚在具有基本表面性质的活性炭上的吸附

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摘要

The adsorption of p-chlorophenol (PCP) from aqueous solution on activated carbons (Acs) with basic surface properties has been studied. The Acs were prepared by two methods. The first method was based on the modification of a commercial CWZ AC by high temperature treatment in an atmosphere of ammonia, nitrogen and hydrogen. The second approach comprised the carbonization followed by activation of N-enriched polymers and coal tar pitch using CO_2 and steam as activation agent. The resultant Acs were characterized in terms of porous structure, elemental composition and surface chemistry (pH_(PZC), acid/base titration, XPS). The adsorption of PCP was carried out from an aqueous solution in static conditions. Equilibrium adsorption isotherm was of L2 type for polymer-based Acs, whereas L3-type isotherm was observed for CWZ Acs series. The Langmuir monolayer adsorption capacity was related to the porous structure and the amount of basic sites. A good correlation was found between the adsorption capacity and the volume of micropores with a width < 1.4 nm for polymer-based Acs. Higher nitrogen content, including that in basic form, did not correspond to the enhanced adsorption of PCP from aqueous solution. The competitive effect of water molecule adsorption on the PCP uptake is discussed.
机译：研究了水溶液中对氯苯酚（PCP）在具有基本表面性质的活性炭（Acs）上的吸附。 Acs通过两种方法制备。第一种方法是基于在氨，氮和氢气氛中通过高温处理对商用CWZ AC进行的改性。第二种方法包括碳化，然后使用CO_2和蒸汽作为活化剂活化富氮聚合物和煤焦油沥青。根据多孔结构，元素组成和表面化学性质（pH_（PZC），酸/碱滴定，XPS）对所得Acs进行表征。 PCP的吸附是在静态条件下从水溶液中进行的。聚合物基Acs的平衡吸附等温线为L2型，而CWZ Acs系列的平衡吸附等温线为L3型。 Langmuir单层吸附能力与多孔结构和碱性位点的数量有关。发现基于聚合物的Acs的吸附能力与宽度小于1.4 nm的微孔体积之间具有良好的相关性。较高的氮含量（包括基本形式的氮含量）并不对应于PCP从水溶液中的吸附增强。讨论了水分子吸附对PCP吸收的竞争作用。

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  • 来源
    《Applied Surface Science》 |2010年第14期|p.4480-4487|共8页
  • 作者

    Ewa Lorenc-Grabowska; rnGrazyna Gryglewicz; rnJacek Machnikowski;

  • 作者单位

    Wroclaw University of Technology, Faculty of Chemistry, Department of Polymer and Carbonaceous Materials, Gdanska 7/9, 50-344 Wroclaw, Poland;

    rnWroclaw University of Technology, Faculty of Chemistry, Department of Polymer and Carbonaceous Materials, Gdanska 7/9, 50-344 Wroclaw, Poland;

    rnWroclaw University of Technology, Faculty of Chemistry, Department of Polymer and Carbonaceous Materials, Gdanska 7/9, 50-344 Wroclaw, Poland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    activated carbon; surface basic sites; adsorption; phenols;

    机译：活性炭;表面基础场所;吸附酚类;

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