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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Ippolito, Samuel J. Joshi, Shravanti Sunkara, Manorama V. |
| Copyright Year | 2016 |
| Abstract | 3D hierarchical heterostructures of p-type Cu2O/n-type SnO2 were synthesized by impregnating porous SnO2 nanospheres with different weight percentages of Cu2O by a simple hydrothermal route. The heterostructures were then evaluated for their photocatalytic performance under visible light irradiation for degradation of rhodamine B (RhB), an organic pollutant. In addition, the effect of varying Cu2O content, and thereby the composition, morphology and photocatalytic activity of the Cu2O/SnO2 nanocomposite were investigated. XRD revealed that the Cu2O/SnO2 nanocomposite comprised of cassiterite tetragonal structured SnO2 and cubic structured Cu2O. HR-TEM and FE-SEM of the as synthesized nanocomposite indicated nearly monodispersed nanospheres with an average size around 60 nm. A UV-vis absorption edge of the Cu2O/SnO2 nanocomposite synthesized in a 1 : 1 ratio was observed at 484 nm (Eg ∼ 2.56 eV) that indicated considerable absorption in the visible region of the solar spectrum. An enhancement in photocatalytic activity was observed with an increase in Cu2O impregnation and the complete photo-oxidation of RhB was possible with the 1 : 1 mole ratio Cu2O/SnO2 nanocomposite in 90 min under optimized conditions. Photocatalytic activity of the Cu2O/SnO2 nanocomposite for the degradation of RhB was much higher than that of individual nanoparticles, primarily attributed to the anti-recombination effect of photogenerated electrons and holes at the junction due to formation of p–n heterojunctions. Identification of intermediates and a detailed mechanism of the photo-oxidation process was accomplished by using analytical techniques such as high-performance liquid chromatography [HPLC] and UV-vis diffuse reflectance [DR] spectroscopy. |
| Starting Page | 43672 |
| Ending Page | 43684 |
| Page Count | 13 |
| File Format | HTM / HTML PDF |
| ISSN | 20462069 |
| Volume Number | 6 |
| Issue Number | 49 |
| Journal | RSC Advances |
| DOI | 10.1039/c6ra07150c |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Rhodamine Spectroscopy Extrinsic semiconductor Tetragonal crystal system Nevus Electronvolt Photo-oxidation of polymers High-performance liquid chromatography Three-dimensional space X-ray crystallography Hydrothermal circulation Nanocomposite Cassiterite |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering |
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