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https://hdl.handle.net/2440/121790
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Type: | Journal article |
Title: | Egg-shaped core/shell α-Mn₂O₃@α-MnO₂ as heterogeneous catalysts for decomposition of phenolics in aqueous solutions |
Other Titles: | Egg-shaped core/shell alpha-Mn(2)O(3)@alpha-MnO(2) as heterogeneous catalysts for decomposition of phenolics in aqueous solutions |
Author: | Saputra, E. Zhang, H. Liu, Q. Sun, H. Wang, S. |
Citation: | Chemosphere, 2016; 159:351-358 |
Publisher: | Elsevier |
Issue Date: | 2016 |
ISSN: | 0045-6535 1879-1298 |
Statement of Responsibility: | Edy Saputra, Huayang Zhang, Qiaoran Liu, Hongqi Sun, Shaobin Wang |
Abstract: | Novel uniform ellipsoid α-Mn2O3@α-MnO2 core/shell (McMs) nanocomposites were prepared via a hydrothermal process with a shape-control protocol followed by calcination at different temperatures. The properties of the composites were characterized by a number of techniques such as thermogravimetric analysis (TGA), X-ray diffraction (XRD), N2 adsorption, and scanning electron microscopy (SEM). The core/shell materials were much effective in heterogeneous oxone(®) activation to generate sulfate and hydroxyl radicals for degradation of aqueous phenol. The McMs composites demonstrated catalytic activity for 100% phenol decomposition in short duration varying between 20 and 120 min, much higher than that of homogeneous Mn(2+) system with 95% phenol degradation in 120 min. They also showed a higher activity than single-phase α-Mn2O3 or α-MnO2. The catalytic activity of phenol degradation depends on temperature, oxone(®) concentration, phenol concentration, and catalyst loading. The catalysts also showed a stable activity in several cycles. Kinetic study demonstrated that phenol degradation reactions follow a first order reaction on McMs catalysts giving activation energies at 32.1-68.8 kJ/mol. With the detection of radicals by electron paramagnetic resonance (EPR), the generation mechanism was proposed. |
Keywords: | Core/shell structure; manganese oxides; phenol removal; sulfate radical; water treatment |
Rights: | © 2016 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.chemosphere.2016.06.021 |
Published version: | http://dx.doi.org/10.1016/j.chemosphere.2016.06.021 |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
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