TY - JOUR
T1 - Sepiolite/TiO2 and metal ion modified sepiolite/TiO2 nanocomposites
T2 - synthesis, characterization and photocatalytic activity in abatement of NOx gases
AU - Papoulis, D.
AU - Somalakidi, K.
AU - Todorova, N.
AU - Trapalis, C.
AU - Panagiotaras, D.
AU - Sygkridou, D.
AU - Stathatos, E.
AU - Gianni, E.
AU - Mavrikos, A.
AU - Komarneni, S.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/10
Y1 - 2019/10
N2 - Un-exchanged and Zn or Cu ion exchanged samples of a newly discovered sepiolite clay from Greece were combined with nanophase anatase titania for the synthesis of sepiolite based nanocomposites and tested for oxidation of NOx gases. The Zn or Cu ion exchanged clay was modified by replacing the exchangeable cations with Zn or Cu ions. Three separate single phase sepiolite samples were prepared, i.e., the sepiolite (S), the one modified with Zn (Zn-S) and the one modified with Cu (Cu-S). Additionally, three nanocomposites were synthesized combining the above three sepiolite samples with TiO2 in weight ratios of 30:70 and named S-TiO2, Zn-S-TiO2 and Cu-S-TiO2, respectively by depositing TiO2 (anatase) on the sepiolite surfaces using titanium isopropoxide as a precursor under hydrothermal treatment at 180 °C. The phase composition, particle morphology and physical properties of the sepiolite samples and the nanocomposites were characterized by XRD, ATR-FTIR, TEM, DRS-UV–Vis and N2-sorption/desorption analyses. The photocatalytic activity of all the clay mineral-titania nanocomposites was examined in the decomposition NOx gases. Sepiolite and especially Zn modified sepiolite based nanocomposites showed better photocatalytic activity for the oxidation of NOx gases compared to that of reference photocatalyst titania P25 under UV-light irradiation.
AB - Un-exchanged and Zn or Cu ion exchanged samples of a newly discovered sepiolite clay from Greece were combined with nanophase anatase titania for the synthesis of sepiolite based nanocomposites and tested for oxidation of NOx gases. The Zn or Cu ion exchanged clay was modified by replacing the exchangeable cations with Zn or Cu ions. Three separate single phase sepiolite samples were prepared, i.e., the sepiolite (S), the one modified with Zn (Zn-S) and the one modified with Cu (Cu-S). Additionally, three nanocomposites were synthesized combining the above three sepiolite samples with TiO2 in weight ratios of 30:70 and named S-TiO2, Zn-S-TiO2 and Cu-S-TiO2, respectively by depositing TiO2 (anatase) on the sepiolite surfaces using titanium isopropoxide as a precursor under hydrothermal treatment at 180 °C. The phase composition, particle morphology and physical properties of the sepiolite samples and the nanocomposites were characterized by XRD, ATR-FTIR, TEM, DRS-UV–Vis and N2-sorption/desorption analyses. The photocatalytic activity of all the clay mineral-titania nanocomposites was examined in the decomposition NOx gases. Sepiolite and especially Zn modified sepiolite based nanocomposites showed better photocatalytic activity for the oxidation of NOx gases compared to that of reference photocatalyst titania P25 under UV-light irradiation.
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U2 - 10.1016/j.clay.2019.105156
DO - 10.1016/j.clay.2019.105156
M3 - Article
AN - SCOPUS:85066801855
SN - 0169-1317
VL - 179
JO - Applied Clay Science
JF - Applied Clay Science
M1 - 105156
ER -