Enhanced Visible Light Photocatalytic Degradation of Methylene Blue by CdS-ZnS-BiPO<sub>4</sub> Nanocomposites Prepared by a Solvent-Assisted Heating Method
In this study, a ternary CdS-ZnS-BiPO<sub>4</sub> nanocomposite, synthesized by a solvent-assisted heating method, demonstrated the highest visible light-induced photocatalysis towards the degradation of methylene blue (MB) when comparing with BiPO<sub>4</sub>, CdS-BiPO<su...
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MDPI AG
2021-09-01
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| Online Access: | https://www.mdpi.com/2073-4344/11/9/1095 |
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| author | Hsin-Chan Tsai Yu-Hui Peng Po-Yu Wen Tsunghsueh Wu Yang-Wei Lin |
| author_facet | Hsin-Chan Tsai Yu-Hui Peng Po-Yu Wen Tsunghsueh Wu Yang-Wei Lin |
| author_sort | Hsin-Chan Tsai |
| collection | DOAJ |
| description | In this study, a ternary CdS-ZnS-BiPO<sub>4</sub> nanocomposite, synthesized by a solvent-assisted heating method, demonstrated the highest visible light-induced photocatalysis towards the degradation of methylene blue (MB) when comparing with BiPO<sub>4</sub>, CdS-BiPO<sub>4</sub>, and ZnS-BiPO<sub>4</sub>. Transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and UV-Vis diffuse reflectance spectroscopy (UV-vis DRS) were used to characterize the prepared nanocomposites. From UV-DRS results, the energy band gap of the prepared BiPO<sub>4</sub> structures was 4.51 eV. When CdS nanoparticles were deposited on BiPO<sub>4</sub> surface by a solvent-assisted heating method, the prepared nanocomposites exhibited visible light-responsive photocatalytic degradation toward MB (20 ppm). At a molar ratio of Cd to Zn as 1:7, the prepared CdS-ZnS-BiPO<sub>4</sub> nanocomposites exhibited the best photocatalytic activity in degrading 95% of MB dyes, out-performing pure BiPO<sub>4</sub>, CdS-BiPO<sub>4</sub>, and ZnS-BiPO<sub>4</sub> due to its enhanced charge separation efficiency and the lowered carrier recombination from the efficient p-n junction of unprecedented ternary composites. The investigations on mechanism conclude that the major reactive species responsible for MB degradation are holes and oxygen radicals. For practicality, the degradation efficiency for different dyestuff (Fast Green FCF, Rhodamine 6G, Acid Blue 1, methyl orange, and methyl red) degradation in the different water matrix samples (pond water, seawater, and lake water) by the prepared CdS-ZnS-BiPO<sub>4</sub> nanocomposites was evaluated. |
| first_indexed | 2024-03-10T07:49:01Z |
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| last_indexed | 2024-03-10T07:49:01Z |
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| series | Catalysts |
| spelling | doaj.art-15e6701ece2d42ec8231cf4279115f1f2023-11-22T12:21:19ZengMDPI AGCatalysts2073-43442021-09-01119109510.3390/catal11091095Enhanced Visible Light Photocatalytic Degradation of Methylene Blue by CdS-ZnS-BiPO<sub>4</sub> Nanocomposites Prepared by a Solvent-Assisted Heating MethodHsin-Chan Tsai0Yu-Hui Peng1Po-Yu Wen2Tsunghsueh Wu3Yang-Wei Lin4Department of Chemistry, National Changhua University of Education, 1, Jin-De Road, Changhua City 5007, TaiwanDepartment of Chemistry, National Changhua University of Education, 1, Jin-De Road, Changhua City 5007, TaiwanDepartment of Chemistry, National Changhua University of Education, 1, Jin-De Road, Changhua City 5007, TaiwanDepartment of Chemistry, University of Wisconsin-Platteville, 1 University Plaza, Platteville, WI 53818-3099, USADepartment of Chemistry, National Changhua University of Education, 1, Jin-De Road, Changhua City 5007, TaiwanIn this study, a ternary CdS-ZnS-BiPO<sub>4</sub> nanocomposite, synthesized by a solvent-assisted heating method, demonstrated the highest visible light-induced photocatalysis towards the degradation of methylene blue (MB) when comparing with BiPO<sub>4</sub>, CdS-BiPO<sub>4</sub>, and ZnS-BiPO<sub>4</sub>. Transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and UV-Vis diffuse reflectance spectroscopy (UV-vis DRS) were used to characterize the prepared nanocomposites. From UV-DRS results, the energy band gap of the prepared BiPO<sub>4</sub> structures was 4.51 eV. When CdS nanoparticles were deposited on BiPO<sub>4</sub> surface by a solvent-assisted heating method, the prepared nanocomposites exhibited visible light-responsive photocatalytic degradation toward MB (20 ppm). At a molar ratio of Cd to Zn as 1:7, the prepared CdS-ZnS-BiPO<sub>4</sub> nanocomposites exhibited the best photocatalytic activity in degrading 95% of MB dyes, out-performing pure BiPO<sub>4</sub>, CdS-BiPO<sub>4</sub>, and ZnS-BiPO<sub>4</sub> due to its enhanced charge separation efficiency and the lowered carrier recombination from the efficient p-n junction of unprecedented ternary composites. The investigations on mechanism conclude that the major reactive species responsible for MB degradation are holes and oxygen radicals. For practicality, the degradation efficiency for different dyestuff (Fast Green FCF, Rhodamine 6G, Acid Blue 1, methyl orange, and methyl red) degradation in the different water matrix samples (pond water, seawater, and lake water) by the prepared CdS-ZnS-BiPO<sub>4</sub> nanocomposites was evaluated.https://www.mdpi.com/2073-4344/11/9/1095solvent-assisted heatingCdS-ZnS-BiPO<sub>4</sub>white-light LEDphotocatalytic degradation |
| spellingShingle | Hsin-Chan Tsai Yu-Hui Peng Po-Yu Wen Tsunghsueh Wu Yang-Wei Lin Enhanced Visible Light Photocatalytic Degradation of Methylene Blue by CdS-ZnS-BiPO<sub>4</sub> Nanocomposites Prepared by a Solvent-Assisted Heating Method Catalysts solvent-assisted heating CdS-ZnS-BiPO<sub>4</sub> white-light LED photocatalytic degradation |
| title | Enhanced Visible Light Photocatalytic Degradation of Methylene Blue by CdS-ZnS-BiPO<sub>4</sub> Nanocomposites Prepared by a Solvent-Assisted Heating Method |
| title_full | Enhanced Visible Light Photocatalytic Degradation of Methylene Blue by CdS-ZnS-BiPO<sub>4</sub> Nanocomposites Prepared by a Solvent-Assisted Heating Method |
| title_fullStr | Enhanced Visible Light Photocatalytic Degradation of Methylene Blue by CdS-ZnS-BiPO<sub>4</sub> Nanocomposites Prepared by a Solvent-Assisted Heating Method |
| title_full_unstemmed | Enhanced Visible Light Photocatalytic Degradation of Methylene Blue by CdS-ZnS-BiPO<sub>4</sub> Nanocomposites Prepared by a Solvent-Assisted Heating Method |
| title_short | Enhanced Visible Light Photocatalytic Degradation of Methylene Blue by CdS-ZnS-BiPO<sub>4</sub> Nanocomposites Prepared by a Solvent-Assisted Heating Method |
| title_sort | enhanced visible light photocatalytic degradation of methylene blue by cds zns bipo sub 4 sub nanocomposites prepared by a solvent assisted heating method |
| topic | solvent-assisted heating CdS-ZnS-BiPO<sub>4</sub> white-light LED photocatalytic degradation |
| url | https://www.mdpi.com/2073-4344/11/9/1095 |
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