Keggin-type polycationic AlO4Al12(OH)24(H2O)127+ intercalated MoO3 composites for methyl orange adsorption

Molybdenum trioxide (MoO3) can be employed as an excellent host for intercalation due to its 2D layered structure that connected by van der Waals interactions. Herein, a series of polyoxometalate-based MoO3 composites (Al-13@MoO3) were successfully prepared by interpolating the Keggin-type polycationic AlO4Al12(OH)(24)(H2O)(12)(7+) (Al-13) into MoO3 gallery. These composites can be applied to rapidly adsorb the anionic dye methyl orange (MO) through strong electrostatic interactions lead to compact and stable gathering in the surrounding of the numerous charged Al-13. Adsorption behaviors of composites with the different amount of Al-13 were determined, these results revealed that Al-13-3.34%@MoO3 exhibited the most remarkable adsorption capacity. More importantly, the composite maintains superior adsorption capacity for five consecutive adsorption/desorption cycles, suggesting that Al-13@MoO3 can be an efficient and durable adsorbent. (C) 2021 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

Automated summary

In this study, polyoxometalate-based molybdenum trioxide composites were successfully prepared and exhibited excellent adsorption capacity for anionic dyes through strong electrostatic interactions. Among the composites, Al-13-3.34%@MoO3 showed the most remarkable adsorption capacity and maintained stable performance after five consecutive adsorption/desorption cycles.