中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 33 No. 7 July 2023 |
（1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;
2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China）
Abstract:A facile hydrothermal route for the synthesis of h-MoO3 nanorods and h-/α-MoO3 composites was proposed. XRD, TG-DSC, FESEM-EDX, TEM, FT-IR, Raman, photoluminescence (PL) and UV-vis DRS spectroscopy were used to characterize the as-synthesized products. h-MoO3 was formed when the liquid/solid ratio of the raw materials was 2:1 and 5:1. However, homogeneous h-/α-MoO3 composites were obtained when the liquid/solid ratio was increased to 8:1 and 12:1. A possible mechanism by which h-MoO3 is formed, and its transformation into α-MoO3 were investigated. h-MoO3 annealing was found to comprise three mass-loss stages; i.e., the removal of each of the following: physically adsorbed water, residual ammonium, and coordinated water. Both h-MoO3 nanorods and h-/α-MoO3 composites demonstrated excellent visible-light-driven photocatalytic performance with regard to methylene blue degradation. The superior degradation efficiency of the h-/α-MoO3 composites was ascribed to a lower recombination rate of electron-hole pairs, a reduced band gap energy, and an enhanced synergistic effect.
Key words: h-MoO3; α-MoO3; hydrothermal synthesis; photocatalytic performance; methylene blue
