From E-Waste to Nb-Pb Co-Doped and Pd-Loaded TiO2/BaTiO3 Heterostructure: Highly Efficient Photocatalytic Performance
From E-Waste to Nb-Pb Co-Doped and Pd-Loaded TiO2/BaTiO3 Heterostructure: Highly Efficient Photocatalytic Performance
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从电子垃圾到 Nb-Pb 共掺杂和 Pd 负载 TiO2/BaTiO3 异质结构：高效光催化性能
DOI：
10.1002/cssc.201900071
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发表时间：
2019
期刊：
影响因子：
8.4
通讯作者：
Xu Zhenming
中科院分区：
文献类型：
--
作者：
Niu Bo;Xu Zhenming
报道了一种新的、可持续的工艺，即通过简单的氯化-浸出路线从废弃多层陶瓷电容器中原位合成Nb-Pb共掺杂和Pd负载的TiO 2/BaTiO 3纳米异质结构。 Nb-Pb共掺杂异质结构的粒度和Pd负载量分别为20-50 nm和小于5 nm。 所制备的样品的带隙在2.81-2.92 eV的范围内。 所制备的异质结构的最佳模拟阳光光催化产氢速率和罗丹明B降解速率分别达到576.8μmol g-1h-1和0.29911 min-1，分别比商用TiO 2高约11.3和19.1倍，比裸TiO 2/BaTiO 3高5.96和8.91倍。 回收的异质结构表现出优异的光稳定性和可重复使用性。这种上级的光催化性能的样品归因于异质结构的形成，Nb-Pb共掺杂，和Pd负载，这增强了可见光吸收和电荷分离效率。此外，DFT计算被用来探讨增强机制。该研究展示了一种将电子废物转化为高附加值和高效光催化剂的可持续过程，该过程具有废物利用，低成本制备和环境保护的优点。
A new and sustainable process was reported for the in situ synthesis of Nb‐Pb co‐doped and Pd‐loaded TiO2/BaTiO3nanometer heterostructures from waste multilayer ceramic capacitors through a simple chlorination–leaching route. The particle size of the Nb‐Pb co‐doped heterostructure and the Pd loading were 20–50 nm and less than 5 nm, respectively. The bandgaps of the prepared samples were in the range 2.81–2.92 eV. The optimal simulated‐sunlight photocatalytic H2production rate and Rhodamine B degradation rate of the prepared heterostructure could reach 576.8 μmol g−1h−1and 0.29911 min−1, respectively, which were approximately 11.3 and 19.1 times higher than those of commercial TiO2, and 5.96 and 8.91 times higher than those of bare TiO2/BaTiO3. The recycled heterostructure exhibited excellent photostability and reusability. Such superior photocatalytic performance of the sample was attributed to the formation of the heterostructure, the Nb‐Pb co‐doping, and the Pd loading, which enhanced the visible light absorption and charge separation efficiency. Furthermore, DFT calculations were applied to explore the enhanced mechanism. This study demonstrates a sustainable process for the conversion of e‐waste to a high‐value‐added and highefficiency photocatalyst, which has the advantages of waste utilization, low‐cost preparation, and environmental protection.