학술논문
Enhanced Photocatalytic Performance of Z-Scheme Design of Bi2 O2 CO3 /Ag/g-C3 N4 Photocatalyst
Document Type
Original Paper
Source
Catalysis Letters. 154(5):2265-2274
Subject
Language
English
ISSN
1011-372X
1572-879X
1572-879X
Abstract
The g-C3 N4 /Ag/Bi2 O2 CO3 nanosheets were synthesized using a mixture of precursors containing melamine and nitrates of silver and bismuth through a simple one-pot synthesis strategy. In the presence of ammonium nitrate, g-C3 N4 /Ag/Bi2 O2 CO3 composite catalysts with different silver mass ratios were prepared, and the photodegradation performance of the composite samples was evaluated by photodegradation of tetracycline hydrochloride (TC) under simulated solar light irradiation. The synthesized composites were characterized by XPD, XPS, FT-IR, TEM, UV–vis DRS and PL. It was found that the g-C3 N4 /Ag/Bi2 O2 CO3 catalyst with Ag mass ratio of 4% exhibited the highest catalytic activity, and the degradation effect was more than 9 times that of pure C3 N4 and nearly 5 times that of g-C3 N4 /Bi2 O2 CO3 .In addition, cyclic experiments showed that g-C3 N4 /Ag/Bi2 O2 CO3 composites had certain stability. The photocatalytic performance of the g-C3 N4 /Ag/Bi2 O2 CO3 composites was attributable to the heterogeneous junction of Bi2 O2 CO3 and g-C3 N4 and the surface plasmon resonance effect (SPR) of Ag nanoparticles. The energy levels of Bi2 O2 CO3 and g-C3 N4 were properly matched to form a heterojunction, which promoted the separation and transfer of photogenerated electrons and holes, thereby improving the photocatalytic performance. The Ag surface plasmon resonance (SPR) effect not only accelerated the separation and transmission of electron–hole pairs, but also enhanced the absorption of visible light. Finally, based on the above basis, a possible photocatalytic mechanism was proposed.Graphical Abstract: