School of Materials Science and Technology, University of Shanghai for Science and Technology, Jungong Rd 516, 200093 Shanghai, P. R. China.
Phys Chem Chem Phys. 2018 Oct 3;20(38):24561-24569. doi: 10.1039/c8cp03530j.
We report a feasible strategy via hydrothermal crystallization to activate Kagome lattice-structured Cu3V2O7(OH)2·2H2O volborthite mineral as a stable visible-light-driven photocatalyst. It was demonstrated to play a crucial role in stimulating absorption ability and photodegradation performance for the removal of methylene blue present in high concentration. In contrast, direct calcination was almost ineffective, whereas post-calcination was significantly detrimental. Moreover, the photocatalytic water oxidation activity of hydrothermally crystallizated volborthite was comparable to that of BiVO4, and it was clearly higher than those of WO3 and g-C3N4 from aqueous NaIO3 solution. By further in situ decoration with an optimum amount of CoOx cocatalysts (i.e., 2 wt%), the oxygen evolution rate of volborthite was greatly enhanced, and it was 1.6-fold, 1.8-fold and 2.9-fold higher than those of BiVO4, WO3 and g-C3N4, respectively. The importance of hydrothermal crystallization can be elucidated in terms of water-Kagome lattice structure interactions involving built-in intrinsic electric field and formation of single hydrogen bonds.
我们报告了一种通过水热结晶激活 Kagome 格子结构的 Cu3V2O7(OH)2·2H2O 方钴矿作为稳定可见光驱动光催化剂的可行策略。该策略被证明在刺激对高浓度亚甲基蓝的吸收能力和光降解性能方面起着关键作用。相比之下，直接煅烧几乎无效，而煅烧后则显著不利。此外，水热结晶方钴矿的光催化水氧化活性可与 BiVO4 相媲美，且明显高于从水性 NaIO3 溶液中的 WO3 和 g-C3N4。通过进一步原位修饰最佳量的 CoOx 助催化剂（即 2wt%），方钴矿的氧气析出速率得到了极大提高，分别比 BiVO4、WO3 和 g-C3N4 提高了 1.6 倍、1.8 倍和 2.9 倍。水热结晶的重要性可以通过涉及内置固有电场和形成单氢键的水-Kagome 格子结构相互作用来阐明。
