@article{Song2024, 
author = {Hao Song and Meng-Si Guo and Jie-Fei Wang and Yu-Qing Liu and Hao-Xue Bi and Jing Du and Wen-Ting An and Yuan-Yuan Ma and Zhan-Gang Han},
title = {Reduced phosphomolybdate as photoassisted electrochemical crystalline sensor for trace Cr(VI) detection},
year = {2024},
journal = {Polyoxometalates},
volume = {3},
number = {4},
pages = {9140065},
keywords = {phosphomolybdate, metal–organic network, photoassisted electrochemical sensor, hexavalent chromium},
url = {https://www.sciopen.com/article/10.26599/POM.2024.9140065},
doi = {10.26599/POM.2024.9140065},
abstract = {The development of a sensitive and efficient detection technology for trace toxic hexavalent chromium (Cr(VI)) in water is a pressing concern. In this study, an hourglass-type phosphomolybdate-based metal–organic network with the formula [Na0.5Cu5.5(H2O)2(btmbp)4][Mn(H2O)3]2{Mn[H6P4Mo6O31]2}·10H2O (1, btmbp = 4,4'-bis((1H-1,2,4-triazol-1-yl)methyl)biphenyl) was hydrothermally synthesized. The crystal network consists of a ladder-like two-dimensional layered structure constructed by vertical connections of one-dimensional (1D) [Na0.5Cu5.5(H2O)2(btmbp)4]6+ metal–organic chains and 1D inorganic polyanionic chains. Compound 1 exhibits excellent electrochemical property and a wide light absorption range including visible light to accelerate the electron transfer in redox processes. When serving as a photoassisted electrochemical (PAEC) sensor for trace Cr(VI) detection, compound 1 exhibits a high sensitivity of 330.5 μA·μM−1 and a low detection limit of 0.95 nM (98.79 ppt) along with high anti-interference ability and excellent PAEC detection stability, outperforming most reported polyoxometalate-based sensors and equaling noble-metal sensors, far satisfying World Health Organization standards for Cr(VI) concentration in drinking water. This work provides a new photoelectrochemical sensor material for monitoring environmental pollutants.}
}