An ultrasonic atomization assisted synthesis of self-assembled manganese oxide octahedral molecular sieve nanostructures and their application in catalysis and water treatment

Aparna Iyer; Chung-Hao Kuo; Saminda Dharmarathna; Zhu Luo; Dinithi Rathnayake; Junkai He; Steven L. Suib

doi:10.1039/C6NR09093A

An ultrasonic atomization assisted synthesis of self-assembled manganese oxide octahedral molecular sieve nanostructures and their application in catalysis and water treatment†

Aparna Iyer,‡^a Chung-Hao Kuo,‡^a Saminda Dharmarathna,‡^a Zhu Luo,^b Dinithi Rathnayake,^a Junkai He^b and Steven L. Suib

*^ab

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* Corresponding authors

^a Department of Chemistry, University of Connecticut, U-3060, 55 North Eagleville Road, Storrs, Connecticut 06269, USA
E-mail: steven.suib@uconn.edu
Fax: +1 860 486 2981
Tel: +1 860 486 2797

^b Institute of Materials Science, University of Connecticut, U-3060, 55 North Eagleville Road, Storrs, Connecticut 06269, USA

Abstract

Manganese oxides of octahedral molecular sieve (OMS-2) type have important applications in oxidation catalysis, adsorption, and as battery materials. The synthesis methods employed determine their morphology and textural properties which markedly affect their catalytic activity. In this work, a room temperature ultrasonic atomization assisted synthesis of OMS-2 type materials is demonstrated. This synthesis differs from previously reported methods in that it is a simple, no-heat application that leads to a striking morphological characteristic of uniformly sized OMS-2 fibers and their self-assembly into dense as well as hollow spheres. Control of various parameters in the ultrasonic atomization assisted synthesis led to OMS-2 with high surface areas (between 136–160 m² g⁻¹) and mesoporosity. Catalytically these materials have higher activities in the oxidation of hydroxymethylfurfural (HMF), a bio-based chemical, (65% conversion of HMF vs. 14% with conventional OMS-2 catalyst) and a higher adsorption of lead from aqueous solutions (70% vs. 12% in conventional OMS-2 materials).

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DOI: https://doi.org/10.1039/C6NR09093A
Article type: Paper
Submitted: 22 Nov 2016
Accepted: 20 Mar 2017
First published: 29 Mar 2017

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Nanoscale, 2017,9, 5009-5018

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An ultrasonic atomization assisted synthesis of self-assembled manganese oxide octahedral molecular sieve nanostructures and their application in catalysis and water treatment

A. Iyer, C. Kuo, S. Dharmarathna, Z. Luo, D. Rathnayake, J. He and S. L. Suib, Nanoscale, 2017, 9, 5009 DOI: 10.1039/C6NR09093A

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An ultrasonic atomization assisted synthesis of self-assembled manganese oxide octahedral molecular sieve nanostructures and their application in catalysis and water treatment†

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An ultrasonic atomization assisted synthesis of self-assembled manganese oxide octahedral molecular sieve nanostructures and their application in catalysis and water treatment

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