Design and synthesis of polyoxovanadate-based framework for efficient dye degradation

A new polyoxovanadate-based framework material [Cu(en) 2 ] 4 V 18 O 42 (H 2 O)·6H 2 O ( 1 ) was designed and synthesized by hydrothermal reaction of NaVO 3 , Cu(NO 3 ) 2 ·6H 2 O and 1, 2-diaminoethane (en) via carefully adjusting the pH value of the reaction system. The structure of the title compound has been determined by single-crystal X-ray diffraction analysis, thermogravimetric analysis, infrared spectra and elemental analysis. Detail structural analysis demonstrate the three-dimensional (3D) framework structure of compound 1 , which was composed of the [V 18 O 42 (H 2 O)] 8− ({V 18 O 42 (H 2 O)}) anions linked by the Cu 2+ cations. Compound 1 represents the first 3D framework based on {V 18 O 42 (H 2 O)} polyoxoanions and copper complexes. Solar-driven degradation of residual organic pollutants in industrial wastewater is still a major problem for human beings. Photocatalytic experiments reveal that compound 1 possesses of excellent photocatalytic activity for the degradation of methylene blue and rhodamine B.