Egg-shaped core/shell α-Mn₂O₃@α-MnO₂ as heterogeneous catalysts for decomposition of phenolics in aqueous solutions
| dc.contributor.author | Saputra, E. | |
| dc.contributor.author | Zhang, H. | |
| dc.contributor.author | Liu, Q. | |
| dc.contributor.author | Sun, H. | |
| dc.contributor.author | Wang, S. | |
| dc.date.issued | 2016 | |
| dc.description.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. | |
| dc.description.statementofresponsibility | Edy Saputra, Huayang Zhang, Qiaoran Liu, Hongqi Sun, Shaobin Wang | |
| dc.identifier.citation | Chemosphere, 2016; 159:351-358 | |
| dc.identifier.doi | 10.1016/j.chemosphere.2016.06.021 | |
| dc.identifier.issn | 0045-6535 | |
| dc.identifier.issn | 1879-1298 | |
| dc.identifier.orcid | Wang, S. [0000-0002-1751-9162] | |
| dc.identifier.uri | http://hdl.handle.net/2440/121790 | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.rights | © 2016 Elsevier Ltd. All rights reserved. | |
| dc.source.uri | https://doi.org/10.1016/j.chemosphere.2016.06.021 | |
| dc.subject | Core/shell structure; manganese oxides; phenol removal; sulfate radical; water treatment | |
| dc.title | Egg-shaped core/shell α-Mn₂O₃@α-MnO₂ as heterogeneous catalysts for decomposition of phenolics in aqueous solutions | |
| dc.title.alternative | Egg-shaped core/shell alpha-Mn(2)O(3)@alpha-MnO(2) as heterogeneous catalysts for decomposition of phenolics in aqueous solutions | |
| dc.type | Journal article | |
| pubs.publication-status | Published |