TY - JOUR
T1 - Cerium and europium doped TiO2thin films deposited by a sol-gel dip-coating process
T2 - characterization and photocatalytic activity toward dye degradation
AU - Hamdi, Dalanda
AU - Mansouri, Lobna
AU - Srivastava, Varsha
AU - Sillanpaa, Mika
AU - Bousselmi, Latifa
N1 - Publisher Copyright:
© 2022 TUBITAK. All rights reserved.
PY - 2022
Y1 - 2022
N2 - Cerium (Ce) and europium (Eu)-doped TiO2thin films were obtained by sol-gel dip-coating technique. SEM micrographs showed that the surfaces are covered by agglomerated particles due to the repeating coating process. XRD patterns showed the presence of TiO2anatase phase. Raman spectra revealed that the peaks recorded at 146 cm-1(Eg) and 397 cm-1(B1g) were related to the anatase phase. EIS measurements proved that Ce-TiO2(1wt%) and Eu-TiO2(0.1wt%) photocatalysts possessed a lower electron transfer resistance than pure TiO2, which can lead to effective separation of electron/ hole pairs during the photoreactions. The photoactivity of Ce and Eu-doped TiO2was investigated by the degradation of amido black10B dye (AB) under UV excitation and varying the initial pH and concentrations. It was found that Eu-TiO2(0.1wt%) exhibited higher photocatalytic activity, reaching a first-order reaction rate of kapp (0.036min-1), t1/2 was around 12 min and AB removal was 98.94%, under optimal pH of 3.5 and AB concentration of 10ppm compared to (t1/2= 45 min, t1/2=30 min), (kapp= 0.022 min-1, kapp=0.026min-1) and AB removal (94.78%, 96.44%), respectively for pure TiO2and Ce-TiO2(1wt%). Further increase in Eu/Ce amount up to optimal concentration (1wt% Ce and 0.1wt% Eu) led to a decrease in the AB removal. The mineralization of AB using Eu-TiO2photocatalyst was confirmed by HPLC analysis.
AB - Cerium (Ce) and europium (Eu)-doped TiO2thin films were obtained by sol-gel dip-coating technique. SEM micrographs showed that the surfaces are covered by agglomerated particles due to the repeating coating process. XRD patterns showed the presence of TiO2anatase phase. Raman spectra revealed that the peaks recorded at 146 cm-1(Eg) and 397 cm-1(B1g) were related to the anatase phase. EIS measurements proved that Ce-TiO2(1wt%) and Eu-TiO2(0.1wt%) photocatalysts possessed a lower electron transfer resistance than pure TiO2, which can lead to effective separation of electron/ hole pairs during the photoreactions. The photoactivity of Ce and Eu-doped TiO2was investigated by the degradation of amido black10B dye (AB) under UV excitation and varying the initial pH and concentrations. It was found that Eu-TiO2(0.1wt%) exhibited higher photocatalytic activity, reaching a first-order reaction rate of kapp (0.036min-1), t1/2 was around 12 min and AB removal was 98.94%, under optimal pH of 3.5 and AB concentration of 10ppm compared to (t1/2= 45 min, t1/2=30 min), (kapp= 0.022 min-1, kapp=0.026min-1) and AB removal (94.78%, 96.44%), respectively for pure TiO2and Ce-TiO2(1wt%). Further increase in Eu/Ce amount up to optimal concentration (1wt% Ce and 0.1wt% Eu) led to a decrease in the AB removal. The mineralization of AB using Eu-TiO2photocatalyst was confirmed by HPLC analysis.
KW - TiO
KW - cerium
KW - dip coating
KW - europium
KW - photodegradation
KW - silicon
KW - sol-gel
UR - http://www.scopus.com/inward/record.url?scp=85129236876&partnerID=8YFLogxK
U2 - 10.55730/1300-0527.3317
DO - 10.55730/1300-0527.3317
M3 - Article
AN - SCOPUS:85129236876
SN - 1300-0527
VL - 46
SP - 415
EP - 433
JO - Turkish Journal of Chemistry
JF - Turkish Journal of Chemistry
IS - 2
ER -