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Efficient nitrate removal by Ca-treated activated carbon derived from agricultural residues

机译：钙处理过的源自农业残留物的活性炭可有效去除硝酸盐

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摘要

Various agricultural residues such as bamboo chips, bagasse bottom ashes, corncobs and macadamia nutshells were used to prepare activated carbon by steam activation. These materials were further treated by Ca(OH)(2) and HCl solution, and the sample originated from bamboo was the best for nitrate removal from water. In addition, the bamboo activated carbon was treated with high concentrations of CaCl2 and HCl solution (BC-CL-A), showing a greater adsorption amount for nitrate removal. BC-CL-A exhibited a nitrate adsorption capacity (0.45 mmol g(-1)) approximately twice as much as that of the untreated sample. The nitrate adsorbed on BC-CL-A was easily desorbed from the surface by KCl solution due to ion exchange between NO3- and Cl-. Regeneration test for BC-CL-A by KCl solution was also examined. After three cycles of regeneration, the adsorbed nitrate could be removed by 88.6%, implying that some nitrates were irreversibly adsorbed on BC-CL-A.
机译：各种农业残留物，例如竹片，蔗渣底灰，玉米芯和澳洲坚果壳，被用于通过蒸汽活化制备活性炭。这些材料分别用Ca（OH）（2）和HCl溶液处理，而竹制样品最适合从水中去除硝酸盐。此外，用高浓度的CaCl2和HCl溶液（BC-CL-A）处理竹制活性炭，显示出更大的吸附量，可以去除硝酸盐。 BC-CL-A的硝酸盐吸附能力（0.45 mmol g（-1））大约是未处理样品的两倍。由于NO3-和Cl-之间的离子交换，吸附在BC-CL-A上的硝酸盐很容易被KCl溶液从表面解吸。还检查了KCl溶液对BC-CL-A的再生测试。经过三个再生周期，被吸附的硝酸盐可以被去除88.6％，这意味着一些硝酸盐被不可逆地吸附在BC-CL-A上。

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  • 来源
    《Desalination and water treatment》 |2017年第1期|287-294|共8页
  • 作者

    Goto Tatsuru; Dolphen Rujira; Amano Yoshimasa; Thiravetyan Paitip; Machida Motoi;

  • 作者单位

    Chiba Univ, Grad Sch Engn, Inage Ku, 1-33 Yayoi Cho, Chiba 2638522, Japan;

    King Mongkuts Univ Technol Thonburi, Pilot Plant Dev & Training Inst, 49 Soi Thianthalay 25,Bangkhuntien Chalthalay Rd, Bangkok 10150, Thailand;

    Chiba Univ, Grad Sch Engn, Inage Ku, 1-33 Yayoi Cho, Chiba 2638522, Japan;

    King Mongkuts Univ Technol Thonburi, Sch Bioresources & Technol, 49 Soi Thianthalay 25,Bangkhuntien Chalthalay Rd, Bangkok 10150, Thailand;

    Chiba Univ, Grad Sch Engn, Inage Ku, 1-33 Yayoi Cho, Chiba 2638522, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nitrate; Adsorption; Activated carbon; Ion exchange;

    机译：硝酸盐吸附活性炭离子交换;

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