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Microwave Synthesis of Cuprous Oxide Micro-/Nanocrystals with Different Morphologies and Photocatalytic Activities

Journal of Materials Science & Technology 2011年第4期27卷 289-295页

作者： Qingwei Zhu Yihe Zhang Jiajun Wang Fengshan Zhou Paul K. Chu State Key Laboratory of Geological Processes & Mineral Resources National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences (Beijing) Beijing 100083 China Department of Powder Metallurgy and Special Materials General Research Institute of Non-Ferrous MetalBeijing 100088 China Department of Physics & Materials Science City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China

Cuprous oxide micro-/nanocrystals were synthesized by using a simple liquid phase reduction process under microwave irradiation. Copper sulfate was used as the starting materials and macromolecule surfactants served as the templates. The morphologies phase and optical properties of them are characterized by X-ray diffraction （XRD）, scanning elec- tron microscopy （SEM） and ultraviolet-visible diffuse reflection absorptive spectra （UV-vis/DRS）, respectively. The crystals had four different shapes, namely spheres, strips, octahedrons, and dandelions. The photocatalytic behavior of the cuprous oxide particles were investigated by monitoring the degradation of rhodamine B. In spite of the differ- ent morphologies, all of the cuprous oxide micro-/nanocrystals exhibited photocatalytic activities under visible light irradiation in the following order： dandelions, strips, spheres, and octahedral crystals. The photocatalytic degradation rates of rhodamine B are 56.37%, 55.68%, 51.83% and 46.16%, respectively. The morphology affects significantly the photocatalytic performance.

关键词： Cuprous oxide Synthesis Morphology photocatalytsis

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Fabrication of a novel Z-scheme photocatalyst Fe2O3/Cu2O for reduction of CO2 with H2O under visible light irradiation

Fabrication of a novel Z-scheme photocatalyst Fe2O3/Cu2O for...

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第十三届固态化学与无机合成学术会议

作者： Ji-Chao Wang Wen-Xue Fang Hong-Chang Yao Zhong-Jun Li 郑州大学

The conversion of anthropogenic CO2 into chemical feedstocks can supplement the natural carbon cycle and might reduce global energy and environment burdens. The semiconductor photocatalyts, such as TiO2,[1] WO[2]3-x and BiV O4,[3] play an important role in reduction of CO2 back to value-added chemicals by solar energy. To overcome the serious drawbacks of rapid charge recombination and the limited visible-light absorption of such semiconductors,[4] the Z-scheme heterostructure photocatalysts, which directly quenches the weaker oxidative holes and reductive electrons in the solid heterostructure interfaces, has proved to be a more preferable one for CO2 photoreduction.[5] Herein, we synthesized Z-scheme photocatalyst Fe2O3/Cu2O by a solvothermal and precipitation route, which was characterized using XRD, XPS, TEM, DRS, UPS. Photocatalytic activities of the as-prepared Fe2O3/Cu2O photocatalysts were evaluated by the photocatalytic reduction of CO2 in water vapor under visible irradiation. The results indicated that the Z-scheme Fe2O3/Cu2O photocatalysts have great selectivity, high photocatalytic performance and excellent reusability.

关键词： Reduction of CO2 Z-scheme photocatalytsis

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