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- 저자 : Jiufu Chen (검색결과 4 건)
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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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Mint powder assisted synthesis of CQDs/BiOCl with tunable OVs and improved photocatalytic property
Chengxu Lai,Junbo Zhong,Jiufu Chen,Yongbing Zhu 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
Development of advanced technologies for the removal of perfluorooctanoic acid (PFOA) from waterbodyhas been a challenge because of the persistent, widely distributed and potentially toxic nature of PFOA inthe aquatic environment as well as the high binding energy of C-F bond, therefore, it is difficult to removePFOA by routine heating, ultraviolet radiation and biological degradation. In this study, BiOCl-based photocatalystscontaining carbon quantum dots (CQDs) with visible light reactivity were prepared by ahydrothermal approach using mint powder (MNP) as raw material for CQDs. The prepared samples exhibitself-assembled three dimensions (3D) flower-like microspheres with adjustable oxygen vacancies(OVs). The experimental results show that the activity of BiOCl modified with CQDs is significantlyincreased compared to that of the reference BiOCl. When the mass ratio of MNP/BiOCl is 2%, the 2%CQDs/BiOCl photocatalyst shows a three-fold enhancement in degradation activity toward destructionof rhodamine (RhB) compared with the reference BiOCl under visible light irradiation. Additionally,degradation activity of 2% CQDs/BiOCl catalyst toward decontamination of PFOA under UV light irradiationalso increases. This presentation offers a robust strategy for the synthesis of significantly efficientphotocatalysts for detoxification of the organic pollutants.
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Qi Yang,Jiao Huang,Junbo Zhong,Jiufu Chen,Jianzhang Li,Siyang Sun 한국물리학회 2017 Current Applied Physics Vol.17 No.9
The photocatalytic efficiency of the bare BiOI has been greatly restricted because of the high recombination rate of electron-hole charge pairs. To further regulate the photocatalytic performance of BiOI, in this work AgI was employed to couple with BiOI. A serial of novel AgI/BiOI heterostructures with improved sunlight-driven photocatalytic activities were prepared in-situ by a hydrothermal method. The results reveal that the presence of AgI in the composites alters band gap of the samples and greatly affects the photo-induced charge separation rate benefited from the strong interaction between AgI and BiOI. $OH and $O2 were observed using electron spin-resonance (ESR) spectroscopy. The photocatalytic activities of AgI/BiOI heterostructures for the decay of methyl orange (MO) and phenol solution under the simulated sunlight irradiation were investigated, the results display that the composite photocatalysts exhibit higher photocatalytic activity than the bare BiOI and excellent stability. The charge separation and transfer mechanism was proposed based on the experimental results.
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Qi Yang,Junbo Zhong,Jian zhang Li,Jiufu Chen,Zhen Xiang,Tao Wang,Minjiao Li 한국물리학회 2017 Current Applied Physics Vol.17 No.4
The inherent drawbacks of Bi2O3 greatly limit the practical application of Bi2O3, thus it is crucial to boost the photocatalytic activity of Bi2O3, and therefore NiO was employed to couple with Bi2O3. In this paper, NiO/Bi2O3 heterostructures with improved sunlight driven -photocatalytic activity were constructed by a pore impregnating method. The samples were studied by Brunauer -Emmett- Teller (BET) method, X-ray diffraction (XRD), UVeVis diffuse reflectance spectroscopy (DRS), high-resolution transmission electron microscopy (HRTEM), surface photovoltage (SPV) spectroscopy and electron spin-resonance (ESR) spectroscopy. The photocatalytic activities of NiO/Bi2O3 heterostructures toward discoloration of methyl orange (MO) aqueous solutions were evaluated. The results display that the presence of NiO in the heterojuctions increases the specific surface area, the absorbance in the visible light region, the separation rate of the photo-induced charge pairs and the formation of $O2 in the photocatalytic system.
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