TY - JOUR
T1 - Transition metal ion substitution in titanosilicate ETS-10 for enhanced UV light photodegradation of methylene blue
AU - Ji, Zhaoxia
AU - Ismail, Mariam N.
AU - Callahan, Dennis M.
AU - Warzywoda, Juliusz
AU - Sacco, Albert
N1 - Funding Information:
The authors thank NASA for financial support.
PY - 2011/6/10
Y1 - 2011/6/10
N2 - Partial isomorphous substitution of transition metal (M = V, Cr, Mn, Fe, Co) ions in the titanosilicate ETS-10 framework (ETMS-10 with M/Ti ≈ 0.06 mol mol-1) was carried out in efforts to enhance the photocatalytic activity of ETS-10 in the degradation of methylene blue (MB) under UV light (280-400 nm) irradiation. XRD, UV-vis, and EDX analyses suggested substitution of V4+/V5+, Cr3+, Mn2+, and Fe 3+ for octahedral Ti4+, and Co2+ for tetrahedral Si4+ in the ETS-10 framework. All ETMS-10 samples showed lower bandgap energies (Eg = 3.79-3.90 eV) than unmodified ETS-10 (Eg = 3.96 eV), and exhibited absorption features in the visible light region. These samples showed higher photocatalytic activities in photodegradation of MB (pseudo-first-order reaction rate constants, k = 0.016-0.055 min-1) than unmodified ETS-10 (k = 0.008 min -1), and the activities decreased in the order: ETCoS-10 > ETCrS-10 ≈ ETFeS-10 > ETMnS-10 ≈ ETVS-10 > unmodified ETS-10. This was hypothesized to be due in part to the lower bandgap energies of ETMS-10 samples compared to that of unmodified ETS-10, as well as the introduction of midgap states with transition metal ions replacing Ti4+, and different d electron configurations of transition metal ions substituted in the ETS-10 framework.
AB - Partial isomorphous substitution of transition metal (M = V, Cr, Mn, Fe, Co) ions in the titanosilicate ETS-10 framework (ETMS-10 with M/Ti ≈ 0.06 mol mol-1) was carried out in efforts to enhance the photocatalytic activity of ETS-10 in the degradation of methylene blue (MB) under UV light (280-400 nm) irradiation. XRD, UV-vis, and EDX analyses suggested substitution of V4+/V5+, Cr3+, Mn2+, and Fe 3+ for octahedral Ti4+, and Co2+ for tetrahedral Si4+ in the ETS-10 framework. All ETMS-10 samples showed lower bandgap energies (Eg = 3.79-3.90 eV) than unmodified ETS-10 (Eg = 3.96 eV), and exhibited absorption features in the visible light region. These samples showed higher photocatalytic activities in photodegradation of MB (pseudo-first-order reaction rate constants, k = 0.016-0.055 min-1) than unmodified ETS-10 (k = 0.008 min -1), and the activities decreased in the order: ETCoS-10 > ETCrS-10 ≈ ETFeS-10 > ETMnS-10 ≈ ETVS-10 > unmodified ETS-10. This was hypothesized to be due in part to the lower bandgap energies of ETMS-10 samples compared to that of unmodified ETS-10, as well as the introduction of midgap states with transition metal ions replacing Ti4+, and different d electron configurations of transition metal ions substituted in the ETS-10 framework.
KW - ETS-10
KW - Methylene blue
KW - Photocatalysis
KW - Titanosilicate
KW - Transition metals
UR - http://www.scopus.com/inward/record.url?scp=79958152272&partnerID=8YFLogxK
U2 - 10.1016/j.jphotochem.2011.04.027
DO - 10.1016/j.jphotochem.2011.04.027
M3 - Article
AN - SCOPUS:79958152272
SN - 1010-6030
VL - 221
SP - 77
EP - 83
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 1
ER -