The fabrication of hollow micro- and nano-crystals can not only increase the specific surface area of the materials but also benefit the understanding of the crystal facet-dependent catalytic activity. On the other hand, both the rational doping of heteroatoms and loading of co-catalysts can enhance the photocatalytic activity of semiconductor-based photocatalysts. However, up to now, there are only a few reports on the synergetic effect of the two. In this work, BiVO4 hollow microplates (HMPs) and solid microplates (SMPs) were synthesized by a facile hydrothermal route, while B3+ ions-doped BiVO4 HMPs loaded with Co(OH)2 nanoparticles [Co(OH)2/B-BiVO4] were prepared through one-step impregnation method. The as-prepared products were characterized in detail. The formation mechanism of BiVO4 HMPs was also proposed on the basis of time-dependent SEM observations and XRD analyses. Taking Rhodamine B (RhB) as a kind of pollutant model, the photocatalytic activities of BiVO4 HMPs, BiVO4 SMPs, B3+ ions-doped BiVO4 HMPs, BiVO4 HMPs loaded by Co(OH)2 nanoparticles, and Co(OH)2/B-BiVO4 HMPs were systematically studied. The results show that {010}-dominant BiVO4 SMPs exhibited better photocatalytic activity for the degradation of RhB than {010} and {110}-dominant BiVO4 HMPs. In addition, the doping of B3+ ions and loading of Co(OH)2 nanoparticles could synergistically enhance the photocatalytic activity of BiVO4 HMPs. The present study not only provides reliable evidence for the crystal facet-dependent photocatalytic activity of BiVO4 but also develops a new strategy for enhancing its photocatalytic activity.

中文翻译：

---

BiVO4空心微孔板：一步法硼掺杂和Co（OH）2负载可实现合成的控制和增强的光催化活性

中空的微晶体和纳米晶体的制造不仅可以增加材料的比表面积，而且有助于理解晶体晶面相关的催化活性。另一方面，杂原子的合理掺杂和助催化剂的负载都可以增强基于半导体的光催化剂的光催化活性。但是，到目前为止，关于两者的协同作用的报道很少。在这项工作中，BiVO4中空微孔板（HMPs）和固体微孔板（SMPs）通过一种简便的水热途径合成，而B3 +离子掺杂的BiVO4 HMP载有Co（OH）2纳米颗粒[Co（OH）2 / B-BiVO4]。通过一步浸渍法制备。对所制备的产品进行了详细的表征。并在时间依赖性的SEM观察和XRD分析的基础上，提出了BiVO4 HMPs的形成机理。以罗丹明B（RhB）作为一种污染物模型，BiVO4 HMP，BiVO4 SMP，B3 +离子掺杂的BiVO4 HMP，Co（OH）2纳米粒子负载的BiVO4 HMP和Co（OH）2 / B-的光催化活性。对BiVO4 HMP进行了系统的研究。结果表明，与{010}和{110}为主导的BiVO4 HMP相比，{010}为主导的BiVO4 SMP对RhB的降解表现出更好的光催化活性。此外，B3 +离子的掺杂和Co（OH）2纳米颗粒的负载可以协同增强BiVO4 HMP的光催化活性。本研究不仅为BiVO4的晶面依赖性光催化活性提供了可靠的证据，而且还开发了一种增强其光催化活性的新策略。