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首页> 外文期刊>RSC Advances >Zeolitic imidazolate metal organic framework ZIF-8 with ultra-high adsorption capacity bound tetracycline in aqueous solution
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Zeolitic imidazolate metal organic framework ZIF-8 with ultra-high adsorption capacity bound tetracycline in aqueous solution

机译：沸石咪唑酯金属有机框架ZIF-8具有超高吸附能力结合的四环素在水溶液中

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摘要

ZIF-8 nanoparticles were prepared with a convenient method at room temperature. The morphology and components of the ZIF-8 were characterized by scanning electron microscopy (SEM), powder X-ray diffraction spectroscopy (PXRD), thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR) and zeta potential analysis. The ZIF-8 nanoparticles were relatively stable under neutral and alkaline solutions, while their structure easily collapsed partially in the strong acidic aqueous solution. The adsorption kinetics and isotherms of ZIF-8 for tetracycline were evaluated in detail. The effects of key parameters such as pH, contact time, temperature and ionic strength on the adsorption of tetracycline were studied. The data on the adsorption of tetracycline on the ZIF-8 nanoparticles fitted well to the pseudo-second-order kinetics model, while the adsorption isotherm data can be explained respectively by the Langmuir isothermal model and the Freundlich isotherm model to varying degrees. The equilibrium quantity of tetracycline on ZIF-8 obtained in adsorption kinetic studies was 124.6 mg g(-1) at 25 degrees C, while the value calculated by the Langmuir isotherm model was above 1000 mg g(-1) at the same temperature. This implied that the adsorption capacity of ZIF-8 to tetracycline can be improved to a large extent. The analysis of the adsorption mechanism showed that electrostatic attraction and p-p stacking interaction both played crucial roles in the adsorption process. Regeneration experiments indicated that the used adsorbent still showed excellent applicability after four rounds of recycling.
机译：在室温下用方便的方法制备ZIF-8纳米颗粒。通过扫描电子显微镜（SEM），粉末X射线衍射光谱（PXRD），热重分析（TGA），傅里叶变换红外光谱（FT-IR）和Zeta电位分析，表征了ZIF-8的形态和组分。 ZIF-8纳米颗粒在中性和碱性溶液下相对稳定，而它们的结构容易部分地部分地在强酸性水溶液中塌陷。详细评估了四环素ZIF-8的吸附动力学和等温度。研究了关键参数如pH，接触时间，温度和离子强度对四环素吸附的影响。 ZIF-8纳米粒子上的四环素吸附的数据井井伪二阶动力学模型，而Langmuir等温模型和Freundlich等温模型可以分别解释吸附等温数据以不同程度。在吸附动力学研究中获得的ZIF-8上的四环素的平衡量在25℃下为124.6mg g（-1），而Langmuir等温模型计算的值在相同温度下高于1000mg g（-1）。这意味着可以在很大程度上提高ZIF-8至四环素的吸附能力。吸附机制的分析表明，静电吸引和P-P堆叠相互作用在吸附过程中起着至关重要的作用。再生实验表明，在四轮再循环后，使用的吸附剂仍显示出优异的适用性。

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  • 来源
    《RSC Advances》 |2015年第100期|共11页
  • 作者

    Wu Chun-sheng; Xiong Zhen-hu; Li Chen; Zhang Jin-miao;

  • 作者单位

    Tianjin Chengjian Univ Sch Environm &

    Municipal Engn Tianjin 300384 Peoples R China;

    Tianjin Chengjian Univ Sch Environm &

    Municipal Engn Tianjin 300384 Peoples R China;

    Tianjin Chengjian Univ Sch Environm &

    Municipal Engn Tianjin 300384 Peoples R China;

    Tianjin Chengjian Univ Sch Environm &

    Municipal Engn Tianjin 300384 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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