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Characterization of KOH modified biochars from different pyrolysis temperatures and enhanced adsorption of antibiotics

机译：不同热解温度的KOH改性生物脉的特征，增强抗生素吸附

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Poplar biochars from pyrolysis at temperatures of 300, 500 and 700 degrees C were modified with KOH and characterized by elemental analysis, Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and nitrogen adsorption-desorption isotherm studies. Adsorption experiments were carried out on the modified biochars to remove tetracycline (TC) from aqueous solution. The results showed that KOH modification could increase or decrease TC adsorption onto biochars depending on the different pyrolysis temperatures. Maximum adsorption capacities (q(e,m)) of TC in modified biochar from a low pyrolysis temperature of 300 degrees C increased up to 21.17 mg g(-1) relative to 4.30 mg g(-1) in unmodified biochar of 300 degrees C (final TC concentrations were 8.83 and 25.70 mg L-1, respectively). In contrast, qe, m decreased from 7.37 and 11.63 mg L-1 to 4.97 and 7.13 mg L-1 in biochars from higher pyrolysis temperatures of 500 and 700 degrees C with and without modification, respectively, even with an increase in SBET. The adsorption ability of biochar can remain over a wider range of pH in modified biochar relative to unmodified biochar. Further analysis indicated that there was a strong linear regression relationship between qe, m and total functional oxygen groups using Bohem titration (n = 6, R-2 = 0.84), whereas no significant relationship was observed between qe, m and SBET in this experiment. The result suggested that KOH modification of biochar from a low pyrolysis temperature can enhance TC adsorption and can be used over a wide range of pH, which may be a good choice for disposal of organic pollutants in aqueous solution.
机译：从热解杨树生物炭在300，500和700摄氏度的温度下，用KOH进行了修改，并通过元素分析，傅里叶变换红外（FT-IR）光谱法，X射线衍射（XRD）和氮吸附 - 脱附等温线的研究。吸附实验在经修饰的生物炭从水性溶液中除去四环素（TC）进行。结果表明，KOH修改可能提高或降低TC吸附到根据不同的热解温度生物炭。最大吸附容量（Q（E，M））TC的改性生物炭从300度低的热分解温度下，在300度未修饰的生物炭增加至相对21.17毫克克（-1），以4.30毫克克（-1） C（TC终浓度分别为8.83和25.70毫克，分别L-1）。与此相反，QE，米从7.37和11.63毫克L-1中从具有和不具有修改的分别500个700摄氏度更高的热解温度，生物炭到4.97和7.13毫克L-1降低，即使增加SBET。在改性生物炭相对于未修饰的生物炭的生物炭的吸附能力可保持在更宽的pH范围内。进一步的分析表明，有QE，m和使用Bohem滴定（N = 6，R-2 = 0.84）总官能氧基之间存在很强的线性回归关系，而在本实验中QE，m和SBET之间没有观察到显著关系。结果表明，从一个低的热分解温度的生物炭KOH修饰可以提高TC吸附和可以在很宽的pH范围内，其可以是用于处置在水溶液的有机污染物的一个很好的选择来使用。

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  • 来源
    《RSC Advances》 |2017年第24期|共9页
  • 作者

    Huang Hua; Tang Jingchun; Gao Kai; He Ruozhu; Zhao Hang; Werner David;

  • 作者单位

    Nankai Univ Key Lab Pollut Proc &

    Environm Criteria Tianjin Engn Ctr Environm Diag &

    Contaminat Remed Minist Educ Coll Environm Sci &

    Engn 94 Weijin Rd Tianjin 300071 Peoples R China;

    Nankai Univ Key Lab Pollut Proc &

    Environm Criteria Tianjin Engn Ctr Environm Diag &

    Contaminat Remed Minist Educ Coll Environm Sci &

    Engn 94 Weijin Rd Tianjin 300071 Peoples R China;

    Tianjin Acad Environm Sci Tianjin 300191 Peoples R China;

    Nankai Univ Key Lab Pollut Proc &

    Environm Criteria Tianjin Engn Ctr Environm Diag &

    Contaminat Remed Minist Educ Coll Environm Sci &

    Engn 94 Weijin Rd Tianjin 300071 Peoples R China;

    Nankai Univ Key Lab Pollut Proc &

    Environm Criteria Tianjin Engn Ctr Environm Diag &

    Contaminat Remed Minist Educ Coll Environm Sci &

    Engn 94 Weijin Rd Tianjin 300071 Peoples R China;

    Newcastle Univ Sch Civil Engn &

    Geosci Newcastle Upon Tyne NE1 7RU Tyne &

    Wear England;

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  • 正文语种 eng
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