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Preparation of macroporous CuAl2O4 spinel monolith and its rapid selective adsorption towards some anionic dyes

Abstract

Macroporous CuAl2O4 spinel monoliths derived from ionic precursors have been successfully synthesized via a sol-gel route in the presence of propyleneoxide (PO) and poly (ethylene oxide) (PEO). PO and PEO cooperatively control the sol-gel transition and phase separation of the system to form the gels with phase-separated macrostructure. The resultant xerogel exists in the form of monolith, and possesses interconnected macroporous channels and co-continuous dense skeletons composed of amorphous Al(OH)3 and Cu2(OH)3Cl. Heat-treatment allows the formation of single crystalline phase CuAl2O4 spinel without spoiling the well-defined interconnected channels, and the CuAl2O4 spinel monoliths with a macropore size of 0.5-1 μm and a porosity of 55%-70% can be obtained after heat-treatment. Three anionic dyes and two cationic dyes are selected as adsorbates to investigate the selective adsorption ability of the resultant monoliths. Results indicate that the as-prepared CuAl2O4 spinel heat-treated at 600 oC shows a high affinity and adsorption rate towards anionic dyes Congo Red (~100%) and Methyl Blue (~81.8%) within 10 min except for Methyl Orange (~25.5%), which can be applied to efficiently and selectively adsorb certain anionic dyes from binary cationic-anionic dye system or the fast separation of methyl orange (MO) from double anionic dye system.

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Publication details

The article was received on 26 Jun 2017, accepted on 07 Sep 2017 and first published on 08 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ02279D
Citation: New J. Chem., 2017, Accepted Manuscript
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    Preparation of macroporous CuAl2O4 spinel monolith and its rapid selective adsorption towards some anionic dyes

    X. Guo, P. Yin, W. Lei and H. Yang, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02279D

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