Synthesis, structure, and characterization of RbNdGe2O6 as a novel visible-light-driven catalyst for photodegradation methylene blue
Synthesis, structure, and characterization of RbNdGe2O6 as a novel visible-light-driven catalyst for photodegradation methylene blue
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RbNdGe2O6作为新型可见光驱动光降解亚甲基蓝催化剂的合成、结构和表征
DOI：
10.1016/j.jssc.2020.121246
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发表时间：
2020-05
影响因子：
3.3
通讯作者：
Lin Fu-Xing
中科院分区：
文献类型：
--
作者：
Zhang Jian-Han;Hao Xian-Dong;Wang Xin;Su Zhi-Zhong;Luo Ju-Xiang;Wu Hong-Yan;Lin Fu-Xing
采用高温固相反应法首次合成了一种新型的稀土锗酸盐RbNdGe 2 O 6。X射线单晶衍射表明，该配合物具有三维结构，由一维钕氧链和环锗酸酯Ge 3 O 9单元连接而成，Rb+位于其内部空间。X射线粉末衍射结合Rietveld精修揭示了我们所制备的样品的相纯度。热行为分析表明，RbNdGe 2 O 6非常稳定，直到998 °C才发生分解。紫外-可见吸收和漫反射光谱特征吸收带的电子跃迁和光学带隙值为4.65 eV。磁化率测量给出了磁性中心之间的显着反铁磁相互作用。光降解实验进行了评价的RbNdGe 2 O 6的光催化活性。以P25为参比，RbNdGe 2 O 6是一种有效的可见光催化剂。虽然RbNdGe 2 O 6的BET值仅为P25的3%，但光催化活性达到P25的0.55倍。此外，通过添加草酸铵作为猝灭剂，进一步验证了所提出的以空穴为主的光催化机理。
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 Ge3O9units 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 RbNdGe2O6is very stable, it doesn’t decomposition until heated up to 998 °C. UV–visible absorption and diffuse reflection spectrum feature characteristic absorption bands off-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, RbNdGe2O6features to be an effective visible-light-driven catalyst in photodegrading methylene blue. Although the BET value of RbNdGe2O6is 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.
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