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Photocatalytic properties of a new Z-scheme system BaTiO 3 /In 2 S 3 with a core-shell structure.
- Source :
-
RSC advances [RSC Adv] 2019 Apr 11; Vol. 9 (20), pp. 11377-11384. Date of Electronic Publication: 2019 Apr 11 (Print Publication: 2019). - Publication Year :
- 2019
-
Abstract
- It's highly desired to design and fabricate an effective Z-scheme photo-catalyst with excellent charge transfer and separation, and a more negative conduction band edge ( E <subscript>CB</subscript> ) than O <subscript>2</subscript> /·O <subscript>2</subscript> <superscript>-</superscript> (-0.33 eV) and a more positive valence band edge ( E <subscript>VB</subscript> ) than ·OH/OH <superscript>-</superscript> (+2.27 eV) which provides high-energy redox radicals. Herein, we firstly designed and synthesized a core-shell-heterojunction-structured Z-scheme system BaTiO <subscript>3</subscript> @In <subscript>2</subscript> S <subscript>3</subscript> (BT@IS, labelled as BTIS) through a hydrothermal method, where commercial BT was used as the core and In(NO <subscript>3</subscript> ) <subscript>3</subscript> · x H <subscript>2</subscript> O together with thioacetamide as the precursor of IS was utilized as the shell material. In this system, the shell IS possesses a E <subscript>CB</subscript> of -0.76 eV and visible-light-response E <subscript>g</subscript> of 1.92 eV, while the core BT possesses a E <subscript>VB</subscript> of 3.38 eV, which is well suited for a Z-scheme. It was found that the as-prepared BTIS possesses a higher photocatalytic degradation ability for methyl orange (MO) than commercial BT and the as-prepared IS fabricated by the same processing parameters as those of BTIS. Holes (h <superscript>+</superscript> ) and superoxide radicals (·O <subscript>2</subscript> <superscript>-</superscript> ) were found to be the dominant active species for BTIS. In this work, the core-shell structure has inhibited the production of ·OH because the shell IS has shielded the OH <superscript>-</superscript> from h <superscript>+</superscript> . It is assumed that if the structure of BTIS is a composite, not a core-shell structure, ·OH could be produced during photocatalysis, and therefore a higher photocatalytic efficiency would be obtained. This current work opens a new pathway for designing Z-scheme photocatalysts and offers new insight into the Z-scheme mechanism for applications in the field of photocatalysis.<br />Competing Interests: There are no conflicts to declare.<br /> (This journal is © The Royal Society of Chemistry.)
Details
- Language :
- English
- ISSN :
- 2046-2069
- Volume :
- 9
- Issue :
- 20
- Database :
- MEDLINE
- Journal :
- RSC advances
- Publication Type :
- Academic Journal
- Accession number :
- 35520269
- Full Text :
- https://doi.org/10.1039/c8ra10592h