%0 Journal Article
%J Applied Catalysis B: Environmental
%D 2021
%T Activation of peroxydisulfate by V-Fe concentrate ore for enhanced degradation of carbamazepine: Surface ≡V(III) and ≡V(IV) as electron donors promoted the regeneration of ≡Fe(II)
%A Leiduo Lai
%A Ji, Haodong
%A Heng Zhang
%A Liu, Rui
%A Chenying Zhou
%A Liu, Wen
%A Zhimin Ao
%A Naiwen Li
%A Liu, Chao
%A Gang Yao
%A Bo Lai
%K Carbamazepine
%K Degradation pathways
%K Electron
%K kinetics
%K Transfer
%X V-Fe concentrate ore was applied to activate peroxydisulfate (PDS) for carbamazepine (CBZ) degradation. The excellent performance of V-Fe concentrate ore was mainly ascribed to the quick electron transfer from surface ≡V(III) and ≡V (IV) to ≡Fe(III) for ≡Fe(II) regeneration, which was confirmed by XPS and XAS analyses. This accelerated ≡Fe(II) regeneration could thus lead to quick formation of HO, SO4−, O2− and effective degradation of CBZ. The degradation rate of CBZ could be also expressed by a kinetic model, i.e., −d[CBZ]/dt = (0.83 mM-0.55 min-1(g/L)-0.65) [CBZ]0.29[PDS]1.26[V-Fe]0.65. Combined with the measured intermediates and the results of DFT calculation, CBZ degradation pathway was proposed systematically. Moreover, this catalyst displayed excellent recyclability and general applicability for a broad substrate scope. This study suggests low valent vanadium makes crucial contributions to the high activity of V-Fe-based catalysts, and improves the understanding of electron transfer mechanism between V and Fe in PDS activation process.
%B Applied Catalysis B: Environmental
%V 282
%P 119559
%G eng
%U http://www.sciencedirect.com/science/article/pii/S0926337320309747
%R http://doi.org/10.1016/j.apcatb.2020.119559