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Jiufu Chen,Shengtian Huang,Junbo Zhong,Jianzhang Li,Wei Hu,Xia Yin,Ran Duan 한국물리학회 2017 Current Applied Physics Vol.17 No.12
In this paper, to further promote the photocatalytic performance of BiPO4, BiOBr was employed to couple with BiPO4. Rod-like BiOBr/BiPO4 composites with improved photocatalytic performance were facilely constructed by one-pot hydrothermal method. The composites were characterized by Brunauer -Emmett-Teller (BET) method, X-ray diffraction patterns (XRD), UVeVis diffuse reflectance spectra (DRS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), surface photovoltage spectroscopy (SPS) and electron spin-resonance (ESR) spectroscopy. The photocatalytic performance of the samples towards degradation of rhodamine B (RhB) and phenol aqueous solution was evaluated under the simulated sunlight irradiation. The SPS results reveal that the separation of photogenerated electron-hole pairs has been promoted due to the formation of heterojuctions. The ESR measurements demonstrate that OH and hþ are involved in the photocatalytic reaction. The photocatalytic evaluation display that the sample with molar ratio of Br/PO4 3 ¼ 0.4% holds the highest activity. The results further substantially exhibit that coupling BiPO4 with BiOBr can remarkably boost the photocatalytic performance of BiPO4, benefiting from significantly enhanced separation of photoinduced charge pairs. Based on all the observations, a Z-scheme separation and transfer scheme of the photoinduced charge pairs of BiOBr/BiPO4 was proposed.
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Yujun Si,Jianzhang Li,Junbo Zhong,Jun Zeng,Shengtian Huang,Wei Yuan,Minjiao Li,Jie Ding 한국물리학회 2016 Current Applied Physics Vol.16 No.3
(BiO)2CO3/BiOI heterojunctions were prepared in-situ by a pore impregnating method using HI aqueous solution. The specific surface area, structure, morphology, and charge separation properties of the heterostructures prepared were characterized by BrunauereEmmetteTeller (BET) method, X-ray diffraction (XRD), scanning electron microscopy (SEM), and surface photovoltage (SPV) spectroscopy, respectively. The active species were investigated using scavengers. The photocatalytic activities of (BiO)2CO3/BiOI heterojunctions towards discoloration of rhodamine B (RhB) under simulated sun light irradiation were evaluated. Benefiting from enhanced charge separation efficiency, the composite photocatalysts exhibit higher photocatalytic performance than the pure BiOI. Finally, the possible reason was discussed.
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