Highly efficient photoelectrocatalytic degradation for ciprofloxacin with a new polyoxometalate-based metal–organic hybrid/BiVO4 photoanode
Yuting Song, Tao Bo, Ji-Cheng Ma, Jian‐Fang Ma
Abstract
Efficient removal of antibiotics is of great significance for the sustainability of aquatic ecosystems. In this work, a new polyoxometalate-based metal–organic hybrid material [Ag 3 L 0.5 (HSiW 12 O 40 )]·2C 2 H 5 OH·2CH 3 CN ( Ag-L-SiW 12 ) was prepared by using Keggin-type polyoxometalate anion and thiacalix[4]arene-based ligand (L) via solvothermal method . Subsequently, a composite heterojunction Ag-L-SiW 12 @BiVO 4 photoanode was fabricated by loading Ag-L-SiW 12 on the surface of BiVO 4 . The photoelectrocatalytic degradation performance of ciprofloxacin (CIP) was explored under the simulated solar radiation. Remarkably, the CIP degradation efficiency reached 93% within 240 min using the optimal Ag-L-SiW 12 @BiVO 4 photoanode, which is approximately 2 and 23 times those of pristine BiVO 4 and Ag-L-SiW 12 , respectively. Furthermore, density functional theory (DFT) calculations were conducted to elucidate the role of Ag-L-SiW 12 during the photoelectrocatalytic process. This work offers an example of the efficient composite photoelectrocatalysts for the treatment of antibiotic wastewater.