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Fabrication of hierarchical porous ZnO-Al2O3 microspheres with enhanced adsorption performance

机译：具有增强吸附性能的分级多孔ZnO-Al2O3微球的制备

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摘要

Hierarchical porous ZnO-Al2O3 microspheres were fabricated through a simple hydrothermal route. The as-prepared hierarchical porous ZnO-Al2O3 composites were utilized as adsorbents to remove organic dye Congo red (CR) from water. The ZnO-Al2O3 composites had morphology of microspheres with diameters in the range of 12-16 mu n, which were assembled by nanosheets with thicknesses of approximately 60 nm. The adsorption kinetics of CR onto the ZnO-Al2O3 composites was properly fitted by the pseudo- second-order kinetic model. The equilibrium adsorption data were perfectly described by the Langmuir isotherm and had a maximum adsorption capacity that reached 397 mg/g, which was significantly higher than the value of the pure alumina (Al2O3) and zinc oxide (ZnO) samples. The superior CR removal efficiency of the ZnO-Al2O3 composites was attributed to its well-developed hierarchical porous structures and larger specific surface area (201 m(2)/g), which were conducive to the diffusion and adsorption of CR molecules. Moreover, the regeneration study reveals that the ZnO-Al2O3 composites have suitable stability and reusability. The results also indicate that the as-prepared sample can act as a highly effective adsorbent in anionic dye removal from wastewater. (C) 2017 Elsevier B.V. All rights reserved.
机译：通过简单的水热法制备了多层多孔ZnO-Al2O3微球。所制备的分层多孔ZnO-Al2O3复合材料被用作吸附剂，以从水中去除有机染料刚果红（CR）。 ZnO-Al2O3复合材料具有直径在12-16微米之间的微球形态，这些微球由厚度约为60 nm的纳米片组装而成。拟二级动力学模型正确拟合了CR在ZnO-Al2O3复合材料上的吸附动力学。朗格缪尔等温线完美地描述了平衡吸附数据，其最大吸附容量达到397 mg / g，明显高于纯氧化铝（Al2O3）和氧化锌（ZnO）样品的值。 ZnO-Al2O3复合材料优异的CR去除效率归因于其发达的分层多孔结构和较大的比表面积（201 m（2）/ g），这有利于CR分子的扩散和吸附。此外，再生研究表明ZnO-Al2O3复合材料具有合适的稳定性和可重复使用性。结果还表明，所制备的样品可作为废水中阴离子染料的高效吸附剂。 （C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2017年第31期|360-368|共9页
  • 作者

    Lei Chunsheng; Pi Meng; Xu Difa; Jiang Chuanjia; Cheng Bei;

  • 作者单位

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China|Changzhou Univ, Coll Environm & Safety Engn, Changzhou 213164, Peoples R China;

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China|Changzhou Univ, Coll Environm & Safety Engn, Changzhou 213164, Peoples R China;

    Changsha Univ, Hunan Key Lab Appl Environm Photocatalysis, Changsha 410022, Hunan, Peoples R China;

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China;

    Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Zinc oxide; Alumina; Hierarchical porous structure; Anionic dye; Adsorption;

    机译：氧化锌;氧化铝;分级多孔结构;阴离子染料;吸附;

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