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首页> 外文期刊>RSC Advances >Adsorption characteristics of Cd(II) in aqueous solutions using spent mushroom substrate biochars produced at different pyrolysis temperatures
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Adsorption characteristics of Cd(II) in aqueous solutions using spent mushroom substrate biochars produced at different pyrolysis temperatures

机译：在不同热解温度下产生的蘑菇基质Biochars在水溶液中CD（II）的吸附特性

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摘要

To effectively remove Cd from water, biochars were produced by pyrolyzing surplus agricultural wastes of spent mushroom substrate (SMS) at 300, 500, and 700 degrees C. The biochars were characterized, and their Cd(II) removal ratios and adsorption capacities in aqueous solutions were evaluated. The physical and chemical properties of the biochars were significantly affected by increasing the pyrolysis temperature; the data indicated that the ash content, pH and specific surface area of the biochars increased, whereas the yield and contents of carbon, hydrogen, nitrogen and oxygen decreased. In addition, the molar ratios of H/C, O/C and (O + N)/C decreased, which implied that the biochars became more aromatic and carbonaceous with a lower polarity and fewer oxygen-based functional groups. The pseudo-second-order kinetics model and Langmuir and Temkin isotherm models described the Cd(II) adsorption better than the other tested models. The biochars derived at higher pyrolysis temperatures had higher adsorption capacities, and the maximum adsorption capacities for PC700 and SC700 were 71.4 (and 46.87 mg g(-1), respectively. The Q(m) values in our study were equivalent to or even higher than those for other modified biochars. This result shows that the biochars in this study are effective adsorbents for Cd(II) removal from wastewater.
机译：为了有效地从水中除去Cd，通过在300,500和700℃下热解除蘑菇基材（SMS）的剩余农业废物来产生生物脉。在表征生物肢，以及它们的CD（II）水性去除率和吸附能力。评估溶液。通过增加热解温度，生物脉内的物理和化学性质显着影响;数据表明，Biochars的灰分含量，pH和比表面积增加，而碳，氢气，氮气和氧的产量和含量降低。另外，H / C，O / C和（O + N）/ c的摩尔比减少，这暗示生物触体变得更加芳香和碳质，具有较低的极性和较少的基于氧的官能团。伪二阶动力学模型和Langmuir和Temkin等温线描述了CD（ii）吸附比其他测试模型更好。在较高的热解温度下衍生的生物脉冲具有较高的吸附能力，PC700和SC700的最大吸附容量分别为71.4（和46.87mg（-1）。我们研究中的Q（m）值相当于甚至更高而不是其他改性的生物炸素。该结果表明该研究中的生物脉基是用于从废水中去除CD（II）的有效吸附剂。

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  • 来源
    《RSC Advances》 |2018年第49期|共11页
  • 作者

    Xian Yang; Wu Jun; Yang Gang; Liao Ruiting; Zhang Xiaohong; Peng Hong; Yu Xiaoyu; Shen Fei; Li Li; Wang Lilin;

  • 作者单位

    Sichuan Agr Univ Coll Environm Sci Chengdu 611130 Sichuan Peoples R China;

    Sichuan Agr Univ Coll Environm Sci Chengdu 611130 Sichuan Peoples R China;

    Sichuan Agr Univ Coll Environm Sci Chengdu 611130 Sichuan Peoples R China;

    Sichuan Agr Univ Coll Environm Sci Chengdu 611130 Sichuan Peoples R China;

    Sichuan Agr Univ Coll Environm Sci Chengdu 611130 Sichuan Peoples R China;

    Sichuan Agr Univ Coll Environm Sci Chengdu 611130 Sichuan Peoples R China;

    Sichuan Agr Univ Coll Environm Sci Chengdu 611130 Sichuan Peoples R China;

    Sichuan Agr Univ Coll Environm Sci Chengdu 611130 Sichuan Peoples R China;

    Sichuan Agr Univ Coll Environm Sci Chengdu 611130 Sichuan Peoples R China;

    Sichuan Agr Univ Coll Environm Sci Chengdu 611130 Sichuan Peoples R China;

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  • 正文语种 eng
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