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The effects of different factors on the removal mechanism of Pb(ii) by biochar-supported carbon nanotube composites

机译：不同因素对Biochar负载碳纳米管复合材料PB（II）去除机理的影响

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Herein, biochar-supported nanomaterials were synthesized using a mixture of chestnut shells and carbon nanotubes via slow pyrolysis at 600 degrees C for 1 h. Then, the adsorption ability of chestnut shell-carbon nanotubes (CS-CNTs) towards the removal of aqueous Pb(ii) was tested. The removal capacity of Pb(ii) by CS-CNT was 1641 mg g(-1), which was significantly higher than that by the biochar of chestnut shells (CSs) (1568 mg g(-1)), which demonstrated that the sorption capacity could be improved by the carbon nanotubes. The factors studied here indicated that the adsorption was rapid in the initial 15 min under the conditions of the Pb(ii) concentration of 50 mg L-1 and the pH value of 5, and the values reached 1417 mg g(-1) and 1584 mg g(-1). The adsorption rate and capacity increased on increasing the concentration of NaCl. The sorption reaction was consistent with the Langmuir model, indicating a mono-layer adsorption behavior. The adsorption process can also be defined via the pseudo-second-order model, suggesting that the adsorption of Pb(ii) might be controlled by chemisorption. After carrying out four cycles of adsorption-desorption experiments, the adsorption rates of CS and CS-CNT remained at 82.92% and 88.91%, respectively, indicating that the biochar samples had stable and excellent sorption ability for heavy metals and huge application value. Thus, this study would provide a promising sorbent for the treatment and remediation of metal contaminants.
机译：在此，使用栗子壳和碳纳米管的混合物通过在600℃下通过慢热解混1小时合成生物丙烯烯类化的纳米材料。然后，测试了栗子壳 - 碳纳米管（CS-CNT）朝向除去PB水溶液（II）的吸附能力。 CS-CNT的PB（II）的去除容量为1641mg G（-1），其显着高于栗子壳（CSS）的生物炭（1568mg（-1）），这证明了碳纳米管可以改善吸附能力。这里研究的因素表明，在50mg L-1的Pb（II）浓度和pH值为5的条件下，吸附在初始15分钟内快速，并且该值达到1417mg g（-1）和1584 mg g（-1）。吸附率和容量增加了增加NaCl浓度。吸附反应与Langmuir模型一致，表明单层吸附行为。吸附过程也可以通过伪二阶模型定义，表明PB（II）的吸附可能通过化学来控制。在进行四个吸附解吸实验后，Cs和CS-CNT的吸附率分别为82.92％和88.91％，表明生物炭样品具有稳定且优异的吸附能力，对重金属和巨大的应用价值。因此，该研究将为治疗和修复金属污染物提供有前途的吸附剂。

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  • 来源
    《RSC Advances》 |2020年第10期|共8页
  • 作者

    Yang Yuewei; Sun Fengfei; Li Jing; Chen Junfeng; Tang Meizhen;

  • 作者单位

    Qufu Normal Univ Sch Life Sci Qufu 273165 Shandong Peoples R China;

    Qufu Normal Univ Sch Life Sci Qufu 273165 Shandong Peoples R China;

    Qufu Normal Univ Sch Life Sci Qufu 273165 Shandong Peoples R China;

    Qufu Normal Univ Sch Life Sci Qufu 273165 Shandong Peoples R China;

    Qufu Normal Univ Sch Life Sci Qufu 273165 Shandong Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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