Jin Jiafeng, Sun Jinsheng, Lv Kaihe, Guo Xuan, Hou Qilin, Liu Jingping, Wang Jintang, Bai Yingrui, Huang Xianbin
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China; Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, PR China.
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, PR China; Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, PR China; CNPC Engineering Technology R & D Company Limited, Beijing 102206, PR China.
J Colloid Interface Sci. 2022 Jan;605:342-353. doi: 10.1016/j.jcis.2021.06.085. Epub 2021 Jun 16.
The introduction of oxygen-defects has been a versatile strategy to enhance photocatalysis efficiency. In this work, a 2D/3D Bi/BiO/BiWO heterojunction photocatalyst with rich oxygen-defective was in sequence prepared through a facile solvothermal method, which displays favorable photocatalytic activity towards organic contaminants under visible-NIR light irradiation. The enhancement in photocatalytic performance can be attributed to the synergistic effect between oxygen-vacancy-rich heterojunction and the localized surface plasmon resonance induced by metallic Bi. The functional group interaction, surface morphology, crystal structure, element composition, and tuned bandgap were investigated by FT-IR, SEM, Raman shift, ICP-MS, and XPS technique. The spectrum response performance of the photocatalyst was verified by UV-visible DRS analysis. Results of photodegradation experiments toward organic contaminants showed that the prepared photocatalyst can degrade 90% of phenol in 20 mins under visible-NIR light irradiation, both Z-scheme heterojunction and the introduction of Bi metal contribute to the enhancement in the photocatalytic activity. The results of the DFT calculation suggest that the valence band-edge hybridization within BiO and BiWO can effectively enhance the photocatalytic performance by increasing the migration efficiencies of electron-hole pairs. Moreover, a possible mechanism was proposed on the results of EIS, ESR and GC-MS tests. This work offers a novel insight for synthesizing efficient visible-NIR light photocatalysis by activating the semiconductors with Bi metal.
引入氧缺陷一直是提高光催化效率的通用策略。在本工作中，通过简便的溶剂热法依次制备了具有丰富氧缺陷的二维/三维Bi/BiO/BiWO异质结光催化剂，该催化剂在可见光-近红外光照射下对有机污染物表现出良好的光催化活性。光催化性能的提高可归因于富氧空位异质结与金属Bi诱导的局域表面等离子体共振之间的协同效应。通过傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、拉曼位移、电感耦合等离子体质谱（ICP-MS）和X射线光电子能谱（XPS）技术研究了官能团相互作用、表面形貌、晶体结构、元素组成和能带隙调控。通过紫外-可见漫反射光谱（UV-visible DRS）分析验证了光催化剂的光谱响应性能。对有机污染物的光降解实验结果表明，所制备的光催化剂在可见光-近红外光照射下20分钟内可降解90%的苯酚，Z型异质结和Bi金属的引入均有助于提高光催化活性。密度泛函理论（DFT）计算结果表明，BiO和BiWO内的价带边缘杂化可通过提高电子-空穴对的迁移效率有效提高光催化性能。此外，根据电化学阻抗谱（EIS）、电子自旋共振（ESR）和气相色谱-质谱联用（GC-MS）测试结果提出了可能的机理。这项工作为通过用Bi金属激活半导体来合成高效可见光-近红外光光催化剂提供了新的见解。
