4.7 Article

Self-curled coral-like γ-Al2O3 nanoplates for use as an adsorbent

期刊

JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 453, 期 -, 页码 244-251

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2015.03.065

关键词

Biomimetic; Nanoporous; Coral; gamma-Al2O3; Adsorption

资金

  1. National Natural Science Foundation of China [21371005, 21171004, 21001002]
  2. China Scholarship Council [201308340032]
  3. China Postdoctoral Science Foundation [2013T60632]
  4. Anhui Jianzhu University
  5. Department of Chemical Engineering at Monash University

向作者/读者索取更多资源

Biomimetic self-curled nanoplates assembled coral-like nanoporous gamma-Al2O3 has been prepared by a solvothermal method using ethylene glycol (EG)-H2O as the mixed solvent, followed by the annealing process. The resulting samples are composed of micro/nanostructured units (similar to 1.5 mu m) with self-curled porous nanoplates on the surface. The volume ratio of EG to water in precursor solution is crucial for the formation of coral-like structure. The formation process is investigated to be an assembly process with self-curled nanoplates driven by adsorption of EG. Importantly, the coral-like porous gamma-Al2O3 has high surface area of 64.18 m(2)/g and exhibits enhanced adsorption performance for efficient removal of heavy metal Hg(II) (49.15 mg/g). The removal capacity is higher than (similar to 2.5 times) those of commercial Al2O3 nanoparticles and hollow structured gamma-Al2O3 prepared without EG (similar to 2.7 times). Further investigation shows adsorption behaviors of the coral-like gamma-Al2O3 and the alumina hollow structure can be well described by Langmuir isotherm model, whereas that of commercial Al2O3 nanoparticles fits Freundlich isotherm model. This work not only provides an inspiration for high efficient biomimetic adsorbent but also presents a facile route for coral-like gamma-Al2O3 preparation. (C) 2015 Elsevier Inc. All rights reserved.

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