Multifunctional photoelectric sensors and catalysts for CO2RR and Cr(vi) solution based on a series of POM-based materials

Five new Keggin-based compounds, namely [Cu-I(dm4bt)(2)](4)[GeW12O40] (1), [MII4(dm4bt)(8)(GeW12O40)(2)(H2O)(2)]center dot 4H(2)O (M = Ni for 2 and Co for 3), [CoII4(dm4bt)(8)(SiW12O40)(2)(H2O)(2)]center dot 6H(2)O (4) and [CuII2(H(2)bdpm)(HBW12O40)(H2O)(2)]center dot H2O (5) (dm4bt = 2,2 '-dimethyl-4,4 '-bithiazole, H(2)bdpm = 1,1 '-bis(3,5-dimethyl-1H-pyrazolate)methane), were synthesized through traditional hydrothermal methods. Compounds 1-5 can be used as photoelectric multifunctional sensors to detect various ions. As electrochemical sensors, n-CPEs have a good sensitivity and wide concentration range for nitrite. As fluorescent sensors, the title compounds have remarkable fluorescence detection performance for Cr2O72-. Furthermore, we modified the compounds as catalysts to investigate their catalytic activities for CO2 reduced to CO and the reduction of Cr(vi) to Cr(iii). The results show that these compounds have high catalytic activities.

Automated summary

Five new compounds based on Keggin structure were synthesized through traditional hydrothermal methods, which can serve as photoelectric multifunctional sensors, electrochemical sensors, and fluorescent sensors, as well as catalysts for the reduction of CO2 and Cr(VI) with high catalytic activities.