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Iron(III) oxyhydroxide and oxide monoliths with controlled multiscale porosity: synthesis and their adsorption performance

Abstract

Iron(III) oxyhydroxide and oxide monoliths with controlled multiscale porosity have been successfully fabricated via the sol-gel process accompanied by phase separation. The size of macropores was controlled by synthetic parameters such as starting compositions. The as-dried iron(III) oxyhydroxide monoliths were amorphous and possessed surface area over 340 m2 g-1, of which mesostructures could be further controlled by a heat-treatment at 250-350 ˚C without collapse of macrostructures and monolithic forms. When the as-dried gel was heated at 300 ˚C, the resultant gel transformed to crystalline α-Fe2O3 and exhibited the specific surface area of 124 m2 g-1. The heat-treatment at 350 ˚C resulted in the broadened size distribution of mesopores. Adsorption behavior of the Congo red has revealed that the interconnected macroporous structure contributed to faster diffusion and better accessibility in a continuous flow-through set up, and the crack-free monolithic forms accounted for an advantageous use of the flow-through adsorbents.

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Publication details

The article was received on 21 Feb 2018, accepted on 10 Apr 2018 and first published on 10 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01691G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Iron(III) oxyhydroxide and oxide monoliths with controlled multiscale porosity: synthesis and their adsorption performance

    Y. Hara, K. Kanamori, K. Morisato, R. Miyamoto and K. Nakanishi, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01691G

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