Photocatalytic degradation of malachite green based on PW12/MWCNTs/Bi2O3 composite photocatalyst

In this study, Bi 2 O 3 nanoparticles are prepared via an impregnation method and modified using multi-walled carbon nanotubes (MWCNTs) and PW 12 . XRD reveals that the prepared Bi 2 O 3 corresponded to the monoclinic α -phase. SEM results reveal that the composite consists of a series of nanosheets with flower-like structures. In this study, malachite green (MG) is used as a simulated contaminant to test the degradation capability of the compound under sunlight, and the effect of PW 12 doping on the photocatalytic properties of the sample is investigated. The results show that the degradation kinetic constant of 0.3 PW 12 /MWCNTs/Bi 2 O 3 (0.8125 h −1 ) is about 3 times that of Bi 2 O 3 (0.2767 h −1 ). The ternary complex containing 30% PW 12 has a degradation rate of 95% in 2.5 h. h + and \(^\cdot {\text{O}}_2^-\) were the major active species in the photocatalytic degradation of MG.