Immobilization of polyoxometalate in a cage-based metal-organic framework towards enhanced stability and highly effective dye degradation

Due to their large surface areas, tunable functionality, and diversiform building blocks, metal-organic frameworks (MOFs) have arisen great attention in the last few decades. Nevertheless, most of MOFs show poor water stability, which seriously hinders their further applications. In this study, through the immobilization of polyoxometalate in a water unstable cage-based MOF material {[(Cu4Cl)(CPT)(4)(H2O)(4)]center dot 3NO(3)center dot 5NMP center dot 3,5H(2)O) (1), in which HCPT = 4-(4-carboxyphenyl)-1,2,4-triazole and NMP = N-methyl pyrrolidone), via a simple one-pot solvothermal reaction, a new hybrid material ([(Cu4Cl)(CPT)(4)]center dot(HSiW12O40)center dot 31H(2)O) (2) can be fabricated. The hybrid material 2 shows a nearly identical network structure to that of 1 but possesses much higher water and chemical stability. Moreover, the visible light dye degradation performance for 2 in water has been illustrated. (C) 2018 Published by Elsevier Ltd.