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首页> 外文期刊>Journal of Polymers and the Environment >Superior Adsorption of Direct Dye from Aqueous Solution by Y(Ⅲ)-Chitosan-Doped Fly Ash Composite as Low-Cost Adsorbent
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Superior Adsorption of Direct Dye from Aqueous Solution by Y(Ⅲ)-Chitosan-Doped Fly Ash Composite as Low-Cost Adsorbent

机译：优异地吸附来自Y（Ⅲ）掺杂的粉煤灰复合材料从水溶液中直接染料作为低成本吸附剂

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摘要

A novel adsorbent, Y/CS/MFA composite was successfully prepared by doping a very small amount of chitosan (CS) and Y(III) ions onto the acid-modified fly ash (named as MFA), and characterized by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) and N-2 gas adsorption/desorption technique. The adsorption property and mechanism of Y/CS/MFA for Direct green 6 (DG 6) removal from aqueous solution were investigated by carrying out batch adsorption experiments. We found that the adsorption of DG 6 on Y/CS/MFA rapidly reached equilibrium within 60 min and could be efficiently removed in a wide range of pH. The adsorption process followed the pseudo-second-order kinetic model well and was chiefly controlled by intraparticle diffusion. The equilibrium data was analyzed through three isothermal models, and it was shown that the Langmuir model could accurately describe adsorption behavior of DG 6, and the saturated adsorption capacity could reach 627 mg/g. The results of mean sorption energy from Dubinin-Radushkevich (D-R) model and FTIR analysis revealed that the adsorption should be the double properties of physisorption and chemisorption. Thermodynamics research indicated that the adsorption reaction was of feasible, spontaneous and exothermic nature. The dye-adsorbed Y/CS/MFA can be effectively desorbed by sodium hydroxide solution and recycled. The adsorption capacity of DG 6 on Y/CS/MFA was about 12 times higher than that on fly ash (FA). Y/CS/MFA composite based on solid waste fly ash would be a promising adsorbent with low cost and superior adsorption properties for high-concentration direct dye removal from wastewater.
机译：通过将非常少量的壳聚糖（Cs）和Y（III）离子掺杂在酸改性的粉煤灰（命名为MFA）上，成功地制备了一种新的吸附剂Y / Cs / MFA复合物，并通过扫描电子显微镜（ SEM），能量分散光谱（EDS），X射线衍射（XRD），傅里叶变换红外（FTIR）和N-2气吸附/解吸技术。通过进行批量吸附实验，研究了从水溶液中去除y / cs / mfa的吸附性和机制。我们发现，在y / cs / mfa上的吸附在y / cs / mfa上在60分钟内快速达到平衡，并且可以在各种pH中有效地除去。吸附过程沿着伪二阶动力学模型良好，主要是通过骨质下扩散来控制。通过三个等温模型分析平衡数据，结果表明，Langmuir模型可以准确地描述DG 6的吸附行为，饱和吸附能力可达到627mg / g。来自Dubinin-Radushkevich（D-R）模型和FTIR分析的平均吸附能结果表明，吸附应是物理吸附和化学的双重性质。热力学研究表明，吸附反应是可行的，自发性和放热性质。染料吸附的Y / CS / MFA可由氢氧化钠溶液有效地解吸并再循环。 Y / CS / MFA上的DG 6的吸附容量比飞灰（FA）更高的12倍。基于固体废物粉煤灰的Y / CS / MFA复合材料将是具有低成本和优异的吸附性能，用于从废水中去除高浓度直接染料的高浓度和优异的吸附性能。

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  • 来源
    《Journal of Polymers and the Environment》 |2020年第6期|1811-1821|共11页
  • 作者

    Li Beigang; Ren Zhongying;

  • 作者单位

    Inner Mongolia Normal Univ Chem & Environm Sci Coll Hohhot 010022 Peoples R China|Inner Mongolia Key Lab Environm Chem Hohhot 010022 Peoples R China;

    Inner Mongolia Normal Univ Chem & Environm Sci Coll Hohhot 010022 Peoples R China|Inner Mongolia Key Lab Environm Chem Hohhot 010022 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fly ash; Yttrium; Chitosan; Composite; Dye adsorption;

    机译：飞灰;钇;壳聚糖;复合;染料吸附;

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