TY - JOUR
T1 - Effect of Co-catalyst (CuO, CoO or NiO) on Bi2O3–TiO2 Structures and Its Impact on the Photocatalytic Reduction of 4-nitrophenol
AU - Guerrero-Araque, Diana
AU - Ramírez-Ortega, David
AU - Calderon, Héctor A.
AU - Saniger, José M.
AU - Gómez, Ricardo
N1 - Publisher Copyright:
© 2020, Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2021/1
Y1 - 2021/1
N2 - CoO, NiO or CuO oxides were employed as co-catalysts on Bi2O3–TiO2 (BT) structure in the photocatalytic reduction of 4-nitrophenol under UV light irradiation. The intimate contact between the co-catalysts and base material contributed to an enhancement in the photocatalytic activity due to the formation of the p-n heterojunction that effectively separates charge carriers. CuO–BT, NiO–BT and Co–BT showed a reduction of 4-nitrophenol of 83%, 59% and 52% after 60 min under illumination, respectively, which are higher than that obtained with the BT semiconductor. The co-catalysts increase the donor density favoring the reduction of 4-nitrophenol. The donor density calculated for CuO–BT, NiO–BT and Co–BT was of Nd= 15.5 × 1018cm−3, Nd= 12.4 × 1018cm−3 and Nd= 9.41 × 1018cm−3, respectively. The results were associated to that CuO and NiO oxides are considered as reduction co-catalysts while CoO oxide is used as oxidation co-catalyst.
AB - CoO, NiO or CuO oxides were employed as co-catalysts on Bi2O3–TiO2 (BT) structure in the photocatalytic reduction of 4-nitrophenol under UV light irradiation. The intimate contact between the co-catalysts and base material contributed to an enhancement in the photocatalytic activity due to the formation of the p-n heterojunction that effectively separates charge carriers. CuO–BT, NiO–BT and Co–BT showed a reduction of 4-nitrophenol of 83%, 59% and 52% after 60 min under illumination, respectively, which are higher than that obtained with the BT semiconductor. The co-catalysts increase the donor density favoring the reduction of 4-nitrophenol. The donor density calculated for CuO–BT, NiO–BT and Co–BT was of Nd= 15.5 × 1018cm−3, Nd= 12.4 × 1018cm−3 and Nd= 9.41 × 1018cm−3, respectively. The results were associated to that CuO and NiO oxides are considered as reduction co-catalysts while CoO oxide is used as oxidation co-catalyst.
KW - 4-nitrophenol
KW - Co-catalyst
KW - Donor density
KW - Photocatalytic reduction
UR - http://www.scopus.com/inward/record.url?scp=85088248357&partnerID=8YFLogxK
U2 - 10.1007/s11244-020-01335-7
DO - 10.1007/s11244-020-01335-7
M3 - Artículo
AN - SCOPUS:85088248357
SN - 1022-5528
VL - 64
SP - 112
EP - 120
JO - Topics in Catalysis
JF - Topics in Catalysis
IS - 1-2
ER -