AgI Nanoparticles Evenly Dispersed on 2D Porous Bi₅O₇I Sheets: Simple Synthesis and Excellent Photocatalytic Performance

Abstract

A series of Bi 5 O 7 I/AgI composites were successfully prepared by the co-precipitation method. Their feature and chemical structure were well characterized. The photocatalytic activity was evaluated by the degradation of Rhodamine B (RhB) under visible light. Experimental results indicated that the sizes of AgI exhibited obviously decrease through dispersing on the surface of Bi 5 O 7 I, and the as-prepared Bi 5 O 7 I/AgI composites revealed better photocatalytic activities for the degradation of RhB than separate Bi 5 O 7 I and AgI. When the mass rate of Bi 5 O 7 I in Bi 5 O 7 I/ AgI composites was 40%, the as-prepared Bi 5 O 7 I/AgI (40 wt%) composites exhibited the optimum photocatalytic activity for degrading RhB, which was approximately 13 and 2.7 times higher than pure Bi 5 O 7 I and AgI, respectively. The enhanced photocatalytic performance could be attributed to complementary potentials of conduction band and valence band of Bi 5 O 7 I and AgI, which promoted the separation of the photogenerated electrons and holes. Finally, the possible mechanism for the photodegradation reaction over Bi 5 O 7 I/AgI composites was proposed.[a] J.

Construction of 2D/2D layered g-C3N4/Bi12O17Cl2 hybrid material with matched energy band structure and its improved photocatalytic performance

“…Hence, the conduction band (CB) potentials ( E CB ) of g-C 3 N 4 and Bi 12 O 17 Cl 2 could be calculated according to eqn (3) . 53 E CB = E VB − E g wherein E VB and E g are the valence band edge potentials and band gap energy of the semiconductors, respectively. The E g of g-C 3 N 4 and Bi 12 O 17 Cl 2 is 2.65 and 2.48 eV, respectively ( Fig.…”

Highly improved visible-light-induced photocatalytic performance over BiOI/Ag2CO3 heterojunctions

“…Finally, e À on the reformed CB potential could reduce the adsorbed O 2 to yield cO 2 À radical, which combined with H 2 O to further transform to the active cOH species. 51 This result might explain why the cO 2 À radical was the main active species. The photogenerated h + on the VB of Ag 2 CO 3 could transfer to the VB of BiOI and become directly involved in the degradation of pollutants because the VB levels of BiOI and Ag 2 CO 3 are less positive than the standard redox potential of cOH/H 2 O (2.68 eV vs. SHE).…”

Controllable Synthesis and Enhanced Photoactivity of Two‐Dimensional Bi2WO6 Ultra‐Thin Nanosheets

“…[1][2][3] Bismuthbased semiconductor materials are recognized as promising photocatalysts due to their suitable bandgaps, high stability, and environmental benignancy. [4][5][6][7][8][9][10] Among these photocatalysts, Bi 2 WO 6 has attracted a great deal of attention because of the special layered crystal structure and the appropriate band gap (2.8 eV). Its crystal structure is composed of [WO 4 ] 2À perovskite layer and [Bi 2 O 2 ] 2 + layer alternately arranged.…”