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Preparation of Activated Carbon by Chemical Activation under Vacuum

机译：真空化学活化法制备活性炭

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摘要

Activated carbons especially used for gaseous adsorption were prepared from Chinese fir sawdust by zinc chloride activation under vacuum condition. The micropore structure, adsorption properties, and surface morphology of activated carbons obtained under atmosphere and vacuum were investigated. The prepared activated carbons were characterized by SEM, FTIR, and nitrogen adsorption. It was found that the structure of the starting material is kept after activation. The activated carbon prepared under vacuum exhibited higher values of the BET surface area (up to 1079 m~2 g~(-1)) and total pore volume (up to 0.5665 cm~3 g~(-1)) than those of the activated carbon obtained under atmosphere. This was attributed to the effect of vacuum condition that reduces oxygen in the system and limits the secondary reaction of the organic vapor. The prepared activated carbon has well-developed microstructure and high mi-croporosity. According to the data obtained, Chinese fir sawdust is a suitable precursor for activated carbon preparation. The obtained activated carbon could be used as a low-cost adsorbent with favorable surface properties. Compared with the traditional chemical activation, vacuum condition demands less energy consumption, simultaneity, and biomass-oil is collected in the procedure more conveniently. FTIR analysis showed that heat treatment would result in the aromatization of the carbon structure.
机译：特别是用于气体吸附的活性炭是由杉木锯末在真空条件下通过氯化锌活化制得的。研究了大气压和真空条件下获得的活性炭的微孔结构，吸附性能和表面形貌。制备的活性炭通过SEM，FTIR和氮吸附进行表征。发现在活化后保持了起始材料的结构。在真空下制备的活性炭具有比BET表面积高的BET表面积值（高达1079 m〜2 g〜（-1））和总孔体积（高达0.5665 cm〜3 g〜（-1））。大气中获得的活性炭。这归因于真空条件的作用，该条件减少了系统中的氧气并限制了有机蒸气的二次反应。制备的活性炭具有发达的微观结构和高的微孔性。根据获得的数据，杉木锯末是制备活性炭的合适前体。所获得的活性炭可以用作具有良好表面性能的低成本吸附剂。与传统的化学活化相比，真空条件所需的能源消耗更少，同时进行，并且在该过程中更容易收集生物质油。 FTIR分析表明热处理将导致碳结构的芳构化。

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  • 来源
    《Environmental Science & Technology》 |2009年第9期|3385-3390|共6页
  • 作者

    YANG JUAN; QIU KE-QIANG;

  • 作者单位

    College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;

    College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;

  • 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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  • 正文语种 eng
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