Defect-mediated Z-scheme BiO2-x/Bi2O2.75 photocatalyst for full spectrum solar-driven organic dyes degradation
Defect-mediated Z-scheme BiO2-x/Bi2O2.75 photocatalyst for full spectrum solar-driven organic dyes degradation
复制标题
用于全光谱太阳能驱动有机染料降解的缺陷介导 Z 型 BiO2-x/Bi2O2.75 光催化剂
DOI：
10.1016/j.apcatb.2019.04.044
复制
发表时间：
2019-10-05
影响因子：
22.1
通讯作者：
Liu, Yun
中科院分区：
文献类型：
--
作者：
Wang, Min;Tan, Guoqiang;Liu, Yun
采用简单的低温水热法制备了无电子介体的缺陷介导Z型BiO 2-x/Bi 2 O2. 75异质结光催化剂。密度泛函理论证明，氧空位的存在会影响BiO 2-x和Bi 2 O2. 75的几何和电子结构，对激子的解离起着不可或缺的促进作用。与纯BiO 2-x相比，BiO 2-x/Bi（2）O（2.75）具有更高的氧化还原能力，这是由于Bi和O缺陷诱导的内建电场形成的Z-模式光催化机理所致。由于氧空位的LSPR效应，所合成的光催化剂在从紫外到近红外光的整个太阳光谱范围内表现出优异的光催化活性，表明其有效地利用了太阳能。在最佳BiO 2-x/Bi2O2.75.在可见光、模拟太阳光和近红外光照射下，BiO_（2-x）的光催化活性分别是纯BiO_（2-x）的8.49、10.22和3.24倍。其优异的光催化活性归因于氧空位的LSPR效应和Z型界面异质结的协同效应。该工作为设计高活性、全太阳光谱驱动的光催化剂用于能源转化和环境修复提供了新的思路。
Defect-mediated Z-scheme BiO2-x/Bi2O2.75 heterojunction photocatalysts without electron mediator was prepared via a simple low-temperature hydrothermal method. DFT proved that the existence of oxygen vacancies would affect the geometric and electronic structure of BiO2-x and Bi2O2.75, which played an indispensable role in promoting exciton dissociation. BiO2-x/Bi(2)O(2.75 )exhibited a higher redox ability compared with the pure BiO2-x due to the Z-scheme photocatalytic mechanism, which could be ascribed to the formation of the build-in electric field induced by Bi and O defects. The as-synthesized photocatalysts exhibited excellent photocatalytic activity over the full solar spectrum from UV to NIR light due to the LSPR effect of oxygen vacancies, indicating its effective utilization of solar energy. The degradation rates of RhB over the optimal BiO2-x/Bi2O2.75. were 8.49, 10.22 and 3.24 times higher than that of the pure BiO2-x under visible light, simulated sunlight and NIR light irradiation, respectively. The excellent photocatalytic activity was ascribed to the synergistic effects of the LSPR effect of oxygen vacancies and the Z-scheme interfacial heterojunction. It was believed that this work provided a new idea to design high active and full solar spectrum-driven photocatalysts for energy conversion and environmental remediation.