Structural characterization and visible light activated photocatalytic ability of glass–ceramics prepared from municipal solid waste
- Resource Type
- Authors
- Bofan Zhang; Irfan Khan; Shiro Kubuki; Hiroshi Saito; Ahmad Salah Ali
- Source
- Journal of Material Cycles and Waste Management. 23:2266-2277
- Subject
- Materials science
Band gap
Kinetics
Inorganic chemistry
Slag
Mechanics of Materials
visual_art
Mössbauer spectroscopy
Photocatalysis
visual_art.visual_art_medium
Ceramic
Waste Management and Disposal
Chemical composition
Visible spectrum
- Language
- ISSN
- 1611-8227
1438-4957
The relationship between local structure and visible-light-activated photocatalytic ability of glass–ceramics prepared from Municipal Solid Waste (MSW) was investigated. The samples were characterized by XRD, 57Fe Mossbauer spectroscopies, TEM and DRS. From the Mossbauer spectrum, it was found that iron ions are present in FeIII(tetrahedral) and FeII(tetrahedral) coordinations. A high covalent iron magnetic component (FeIV) with small isomeric shifts is also confirmed in the Model Slag (MS-x) samples. The energy band gap values of the samples can easily be tuned by simple adjusting the initial iron concentration and heat treatment. The largest degradation of 99.56% was estimated for methylene blue dye under the visible-light irradiation using MS-15. It is concluded that a small change of chemical composition in MSW contributed to a large change of first-order-rate kinetics and local structure. This study provides a novel approach for the removal of contaminants using MSW and sheds new insights into the presence of FeIV species enhancing photocatalytic activity.