Ag3PO4/Fe2O3 composite photocatalysts with an n-n heterojunction semiconductor structure under visible-light irradiation

作者：Yan, Yanhong; Guan, Huaiyu; Liu, Song^*; Jiang, Rongying

来源：Ceramics International, 2014, 40(7): 9095-9100.

DOI：10.1016/j.ceramint.2014.01.123

• Ag3PO4/Fe2O3 composites
• n-n heterojunction
• Photocatalysis

Highly active Ag3PO4/Fe2O3 composite photocatalysts with an n-n heterojunction semiconductor structure have been prepared by ultrasoundassisted precipitation. These photocatalysts were characterized by XPS, XRD, SEM, TEM, UV vis and PL spectroscopy. The photodegradation of methyl orange in aqueous solution under visible-light irradiation has been investigated over Ag3PO4-based photocatalysts consisting of different Ag3PO4/Fe2O3 mass ratios. Ag3PO4/Fe2O3 composite photocatalysts were shown to have a higher photocatalytic destruction rate than Ag3PO4 mainly due to electrostatic-field-driven electron hole separation in Ag3PO4/Fe2O3 composite photocatalysts. The best Ag3PO4/Fe2O3 composite photocatalyst with mass ratio of Ag3PO4:Fe2O3 of 10:1 showed approximately 6 times higher photocatalytic activity than pure Ag3PO4. The role of n-n Ag3PO4-Fe2O3 heterojunction was discussed in view of theory of semiconductor physics.

• 出版日期2014-8
• 单位华南理工大学