Photocatalytic Mineralization of Organic Acids over Visible-Light-Driven Au/BiVO4 Photocatalyst
Au/BiVO4 visible-light-driven photocatalysts were synthesized by coprecipitation method in the presence of sodium dodecyl benzene sulfonate (SDBS) as a dispersant. Physical characterization of the obtained materials was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), ener...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2013/943256 |
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| author | Kanlaya Pingmuang Natda Wetchakun Wiyong Kangwansupamonkon Kontad Ounnunkad Burapat Inceesungvorn Sukon Phanichphant |
| author_facet | Kanlaya Pingmuang Natda Wetchakun Wiyong Kangwansupamonkon Kontad Ounnunkad Burapat Inceesungvorn Sukon Phanichphant |
| author_sort | Kanlaya Pingmuang |
| collection | DOAJ |
| description | Au/BiVO4 visible-light-driven photocatalysts were synthesized by coprecipitation method in the presence of sodium dodecyl benzene sulfonate (SDBS) as a dispersant. Physical characterization of the obtained materials was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), UV-Vis diffuse reflectance spectroscopy (DRS) and Brunauer, and Emmett and Teller (BET) specific surface area measurement. Photocatalytic performances of the as-prepared Au/BiVO4 have also been evaluated via mineralizations of oxalic acid and malonic acid under visible light irradiation. XRD and SEM results indicated that Au/BiVO4 photocatalysts were of almost spherical particles with scheelite-monoclinic phase. Photocatalytic results showed that all Au/BiVO4 samples exhibited higher oxalic acid mineralization rate than that of pure BiVO4, probably due to a decrease of BiVO4 band gap energy and the presence of surface plasmon absorption upon loading BiVO4 with Au as evidenced from UV-Vis DRS results. The nominal Au loading amount of 0.25 mol% provided the highest pseudo-first-order rate constant of 0.0487 min−1 and 0.0082 min−1 for degradations of oxalic acid (C2) and malonic acid (C3), respectively. By considering structures of the two acids, lower pseudo-first-order rate constantly obtained in the case of malonic acid degradation was likely due to an increased complexity of the degradation mechanism of the longer chain acid. |
| format | Article |
| id | doaj-art-cefb534cb48940c4946243665540fb5a |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-cefb534cb48940c4946243665540fb5a2025-02-03T05:46:06ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2013-01-01201310.1155/2013/943256943256Photocatalytic Mineralization of Organic Acids over Visible-Light-Driven Au/BiVO4 PhotocatalystKanlaya Pingmuang0Natda Wetchakun1Wiyong Kangwansupamonkon2Kontad Ounnunkad3Burapat Inceesungvorn4Sukon Phanichphant5Nanoscience Research Laboratory and Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, ThailandMaterials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, ThailandNational Nanotechnology Center, Thailand Science Park, Paholyothin Road, Klong 1, Klong Luang, Phathumthani 12120, ThailandNanoscience Research Laboratory and Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, ThailandNanoscience Research Laboratory and Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, ThailandMaterials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, ThailandAu/BiVO4 visible-light-driven photocatalysts were synthesized by coprecipitation method in the presence of sodium dodecyl benzene sulfonate (SDBS) as a dispersant. Physical characterization of the obtained materials was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), UV-Vis diffuse reflectance spectroscopy (DRS) and Brunauer, and Emmett and Teller (BET) specific surface area measurement. Photocatalytic performances of the as-prepared Au/BiVO4 have also been evaluated via mineralizations of oxalic acid and malonic acid under visible light irradiation. XRD and SEM results indicated that Au/BiVO4 photocatalysts were of almost spherical particles with scheelite-monoclinic phase. Photocatalytic results showed that all Au/BiVO4 samples exhibited higher oxalic acid mineralization rate than that of pure BiVO4, probably due to a decrease of BiVO4 band gap energy and the presence of surface plasmon absorption upon loading BiVO4 with Au as evidenced from UV-Vis DRS results. The nominal Au loading amount of 0.25 mol% provided the highest pseudo-first-order rate constant of 0.0487 min−1 and 0.0082 min−1 for degradations of oxalic acid (C2) and malonic acid (C3), respectively. By considering structures of the two acids, lower pseudo-first-order rate constantly obtained in the case of malonic acid degradation was likely due to an increased complexity of the degradation mechanism of the longer chain acid.http://dx.doi.org/10.1155/2013/943256 |
| spellingShingle | Kanlaya Pingmuang Natda Wetchakun Wiyong Kangwansupamonkon Kontad Ounnunkad Burapat Inceesungvorn Sukon Phanichphant Photocatalytic Mineralization of Organic Acids over Visible-Light-Driven Au/BiVO4 Photocatalyst International Journal of Photoenergy |
| title | Photocatalytic Mineralization of Organic Acids over Visible-Light-Driven Au/BiVO4 Photocatalyst |
| title_full | Photocatalytic Mineralization of Organic Acids over Visible-Light-Driven Au/BiVO4 Photocatalyst |
| title_fullStr | Photocatalytic Mineralization of Organic Acids over Visible-Light-Driven Au/BiVO4 Photocatalyst |
| title_full_unstemmed | Photocatalytic Mineralization of Organic Acids over Visible-Light-Driven Au/BiVO4 Photocatalyst |
| title_short | Photocatalytic Mineralization of Organic Acids over Visible-Light-Driven Au/BiVO4 Photocatalyst |
| title_sort | photocatalytic mineralization of organic acids over visible light driven au bivo4 photocatalyst |
| url | http://dx.doi.org/10.1155/2013/943256 |
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