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NaOH预处理制备介孔木糖渣活性炭及其性能

刘鹏鹏 周素坤 王超 游婷婷 许凤

刘鹏鹏, 周素坤, 王超, 游婷婷, 许凤. NaOH预处理制备介孔木糖渣活性炭及其性能[J]. 北京林业大学学报, 2018, 40(3): 128-134. doi: 10.13332/j.1000-1522.20170431
引用本文: 刘鹏鹏, 周素坤, 王超, 游婷婷, 许凤. NaOH预处理制备介孔木糖渣活性炭及其性能[J]. 北京林业大学学报, 2018, 40(3): 128-134. doi: 10.13332/j.1000-1522.20170431
Liu Pengpeng, Zhou Sukun, Wang Chao, You Tingting, Xu Feng. Preparation and properties of mesoporous activated carbons from NaOH-pretreated corncob residues[J]. Journal of Beijing Forestry University, 2018, 40(3): 128-134. doi: 10.13332/j.1000-1522.20170431
Citation: Liu Pengpeng, Zhou Sukun, Wang Chao, You Tingting, Xu Feng. Preparation and properties of mesoporous activated carbons from NaOH-pretreated corncob residues[J]. Journal of Beijing Forestry University, 2018, 40(3): 128-134. doi: 10.13332/j.1000-1522.20170431

NaOH预处理制备介孔木糖渣活性炭及其性能

doi: 10.13332/j.1000-1522.20170431
基金项目: 

教育部中央高校基本科研基金资助项目 2015ZCQ-CL-03

详细信息
    作者简介:

    刘鹏鹏。主要研究方向:生物质基功能材料。Email: 2238179172@qq.com 地址:100083北京市海淀区清华东路35号北京林业大学材料科学与技术学院

    责任作者:

    游婷婷,讲师。主要研究方向:生物质预处理及木质素结构研究。Email: youtingting0928@bjfu.edu.cn 地址:同上

  • 中图分类号: S713

Preparation and properties of mesoporous activated carbons from NaOH-pretreated corncob residues

  • 摘要: 目的与普通活性炭比较,介孔活性炭具有疏水性好、孔体积大、导电性能好等优势,然而传统制备方法繁杂,原料成本较高。因此,探究新型介孔活性炭制备工艺尤为重要。方法以木糖渣为原料,采用NaOH预处理、低温硫酸辅助炭化与磷酸活化相结合的方法制备了高介孔率活性炭。通过单因素实验,分析NaOH预处理时间、浸渍比以及活化温度对活性炭的亚甲基蓝(MB)吸附性能的影响。结果研究表明:NaOH预处理脱除木质素促使原料形成孔隙通道,同时使木糖渣纤维发生润胀,有利于活化剂与原料接触,从而获得高介孔率、高比表面积活性炭。当NaOH预处理时间为4h,磷酸与原料浸渍比4:1,活化温度500℃,活化时间为1h所制备的活性炭具有较高的MB吸附值436mg/g。扫描电镜分析结果表明:样品表面含有丰富的大孔及中孔结构,整体活化充分均匀。氮气物理吸附-脱附分析结果表明:活性炭具有发达的孔隙结构,其比表面积和总孔体积分别高达2038m2/g和2.13cm3/g,其中介孔孔容1.56cm3/g,介孔率达到73.2%,平均孔径为4.18nm。结论采用适当的NaOH预处理有利于制备孔隙结构优越的活性炭,在重金属离子吸附、有机大分子废水处理以及电子元器件等领域有广泛的应用前景。本研究将为高比表面积介孔活性炭的制备奠定理论基础,并为工业木糖渣的高值化利用提供了一条新途径。

     

  • 图  1  NaOH预处理时间对活性炭的MB吸附性能的影响

    Figure  1.  Effects of NaOH pretreatment time on MB adsorption value of the activated carbon

    图  2  NaOH预处理时间对木糖渣木质素脱除率的影响

    Figure  2.  Effects of NaOH pretreatment time on lignin removal rate of corncob residue

    图  3  浸渍比对活性炭的MB吸附性能的影响

    Figure  3.  Effects of impregnation ratio on MB adsorption value of the activated carbon

    图  4  活化温度对活性炭的MB吸附性能的影响

    Figure  4.  Effects of activation temperature on MB adsorption value of the activated carbon

    图  5  木糖渣活性炭氮气吸附-脱附等温线(a)及孔径分布(b)

    Figure  5.  N2 adsorption-desorption isotherms (a) and pore size distribution (b) of the activated carbon

    图  6  木糖渣原料(a)、木糖渣活性炭活化前(b)及活化后(c)的扫描电镜图

    Figure  6.  SEM images of the corncob residues raw material (a), the activated carbon before (b) and after activation (c)

    表  1  NaOH预处理时间对活性炭各参数的影响

    Table  1.   Effects of NaOH-pretreated time on the activated carbon parameters

    NaOH预处理时间
    NaOH pretreatment time/h
    SBET/
    (m2·g-1)
    Vt/
    (cm3·g-1)
    Vmic/
    (cm3·g-1)
    Vmes/
    (cm3·g-1)
    平均孔径
    Average pore size/nm
    介孔率
    Mesoporous rate/%
    0 1 325 0.79 0.67 0.12 1.78 15.2
    1 1 387 0.84 0.52 0.32 2.23 38.1
    2 1 416 1.04 0.49 0.65 3.36 62.5
    3 1 652 1.54 0.52 0.92 3.71 59.7
    4 2 038 2.13 0.57 1.56 4.18 73.2
    5 1 753 1.61 0.45 1.16 4.88 72.1
    注:SBET为活性炭比表面积,Vt为总孔容,Vmic为微孔孔容,Vmes为介孔孔容。Notes:SBET is the specific surface area of the activated carbon, andVt, Vmic andVmes are total pore volume, micoporous volume, and mesoporous volume, respectively.
    下载: 导出CSV

    表  2  不同活性炭样品性能指标对比

    Table  2.   Comparison in property index for different activated carbon

    原料
    Rawmaterial
    SBET/
    (m2·g-1)
    Vt/
    (cm3·g-1)
    介孔率
    Mesoporousrate/%
    MB吸附值
    MBadsorptionvalue/(mg·g-1)
    参考文献
    References
    木糖渣Corncobresidues 2038 2.13 73.2 436 本试验Thisexperiment
    聚丙烯塑料-锯末Polypropyleneandsawdust 1462 1.04 70.0 323 [21]
    锯末Sawdust 2104 1.63 71.8 387 [22]
    碱木糖渣Alkalixyloseresidues 1850 1.48 360 [23]
    椰壳Coconutshell 1723 0.87 375 [24]
    桉木屑Eucalyptussawdust 1886 240 [25]
    下载: 导出CSV
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  • 收稿日期:  2017-11-29
  • 修回日期:  2017-12-26
  • 刊出日期:  2018-03-01

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