Journal
APPLIED SURFACE SCIENCE
Volume 426, Issue -, Pages 360-368Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.07.095
Keywords
Zinc oxide; Alumina; Hierarchical porous structure; Anionic dye; Adsorption
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Funding
- Self-determined and Innovative Research Funds of SKLWUT [2017-ZD-4]
- 973 Program [2013CB632402]
- NSFC [51208068, 51372190, 21573170]
- Social Development Project of Jiangsu Province [BE2015670, BY2016029-20]
- Natural Science Foundation of Hubei Province of China [2015CFA001]
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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.
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