Synthesis, structure, and characterization of RbNdGe2O6 as a novel visible-light-driven catalyst for photodegradation methylene blue
| Autor: | Jian-Han Zhang, Ju-Xiang Luo, Zhi-Zhong Su, Xian-Dong Hao, Fu-Xing Lin, Xin Wang, Hong-Yan Wu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Rietveld refinement 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry Materials Chemistry Ceramics and Composites Photocatalysis Germanate Diffuse reflection Physical and Theoretical Chemistry 0210 nano-technology Photodegradation Single crystal Powder diffraction Visible spectrum |
| Zdroj: | Journal of Solid State Chemistry. 285:121246 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2020.121246 |
| Popis: | A novel lanthanide germanate, namely RbNdGe2O6, has been successfully synthesized by high-temperature solid-state reaction in open air atmosphere for the first time. Single crystal X-ray diffraction indicates a 3D framework composed of 1D neodymium oxygen chains connected with cyclogermanate Ge3O9 units with Rb+ located in the internal space. X-ray powder diffraction coupled with Rietveld refinement reveals the sample’s phase purity we have prepared. Thermal behavior analysis shows RbNdGe2O6 is very stable, it doesn’t decomposition until heated up to 998 °C. UV–visible absorption and diffuse reflection spectrum feature characteristic absorption bands of f-electron transition and an optical bandgap value of 4.65 eV. Magnetic susceptibilities measurement gives significant antiferromagnetic interactions between magnetic centers. The photodegradation experiments were performed to evaluate photocatalytic activities of RbNdGe2O6. By using P25 as a reference, RbNdGe2O6 features to be an effective visible-light-driven catalyst in photodegrading methylene blue. Although the BET value of RbNdGe2O6 is only 3% that of P25, the photocatalytic activity reaches 0.55 times that of P25. Furthermore, the proposed photocatalytic mechanism which dominated by holes was further verified by adding ammonium oxalate as a quencher. |
| Databáze: | OpenAIRE |
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