Abstract：
:The photochemical behavior of goethite has been one of the most important topics in the field of environmental science due to it plays a significant role in the removal and transformation process of numerous pollutants. However, the interfacial electron transfer process of goethite is not clear. Using a nanosecond laser flash photolysis spectrometer, we report the transient spectroscopic observations of interfacial electron-transfer reactions in goethite dispersion under UV irradiation. Excitation of goethite generated conduction-band electron (ecb-) and hole (h+). The conduction band electron (ecb-) reacted with an electron acceptor, methylviologen dichloride hydrate (MV2+), forming reduced methylviologen (MV+) with a second-order rate constant of (2.6 ± 0.3) × 109 L mol-1 s-1. The concentration of MV+ was strongly influenced by MV2+ initial concentration and pH values. The flat band potential of goethite was calculated to be Efb (goethite, pH = 7) = 0.24 V (vs NHE). Oxygen did not react with conduction band electron of goethite. The present study provides a reliable method to investigate the photo-induced interfacial charge transfer of goethite.
journal_name
Chemospherejournal_title
Chemosphereauthors
Ma J,Zhu C,Lu J,Ouyang B,Xie Q,Liu H,Peng S,Chen Tdoi
10.1016/j.chemosphere.2017.09.029subject
Has Abstractpub_date
2017-12-01 00:00:00pages
667-676eissn
0045-6535issn
1879-1298pii
S0045-6535(17)31443-1journal_volume
188pub_type
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