Abstract：
:This work focuses on the photocatalytic removal of recalcitrant organic pollutants in water treatment. Based on facile precipitation reaction, we fabricated a photocatalyst (PbCrO4) in single crystals that present evident response to visible light and employed the catalyst in the photocatalytic decomposition of microcystin-LR (MC-LR). In the degradation test using the nanorods with prepared PbCrO4 photocatalyst, a 100% removal efficiency (27 min reaction) and a kinetics constant of 0.1356 min-1 were achieved. Such a high performance of PbCrO4 in photocatalytic conversion of MC-LR was ascribed to its high carrier separation efficiency, positive valence band (VB) position, and good delocalization of VB and conduction band (CB). The test of electron spin-resonance resonance (ESR) demonstrated that excessive free OH radicals were produced during the PbCrO4 photocatalysis of MC-LR. The density functional theory (DFT) and LC/MS/MS technology were employed to ascertain the intermediates during the MC-LR photocatalytic degradation. The major intermediates were resulted from the attack of hydroxyl radicals to the ADDA side chains of MC-LR structure. This study provides a proof-of-concept strategy to develop effective photocatalysts to efficiently produce OH radicals for the visible-light induced photocatalytic degradation of MC-LR in water.
journal_name
Chemospherejournal_title
Chemosphereauthors
Liu G,Zhang G,Zhang S,Xu Y,Yang X,Zhang Xdoi
10.1016/j.chemosphere.2019.124739subject
Has Abstractpub_date
2020-01-01 00:00:00pages
124739eissn
0045-6535issn
1879-1298pii
S0045-6535(19)31975-7journal_volume
239pub_type
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