Bismuth Oxybromide Nanosheets: Microwave Synthesis, Growth Into Microflowers and Photocatalytic Activity

Abstract

The original Bi-based oxyhalide is the Sillen family expressed by [M 2 O 2 ][X m ] or [M 3 O 4+n ][X m ] (m=1-3, X=halide, M=Bi) where bismuth oxide-based fluorite-like layers, [M 2 O 2 ] or [M 3 O 4+n ], are intergrown with single, double, and triple halide. The band gap ofBiOX is strictly dependent on the halide participated in its composition and ranges from 3.19-3.44, 2.64-2.91 and 1.77-1.92 eV, respectively for Cl, Br and I. Bismuth nitrate pentahydrate and potassium bromide were applied to synthesize the product in a domestic microwave instrument. The SEM images showed the microflowers were comprised of nanosheets with the thickness of about 54 nm. From energy dispersive X-ray analysis, its empirical formula was estimated to be Bi 1.75 O 13.66 Br. Fourier transform infrared spectroscopy showed that the peaks at 565 and 815 cm -1 were attributed to the stretching vibration of Bi-O.With a band gap energy of 3.58 eV, it showed a high photocatalytic performance in photodegradation of Rhodamine B.

Growth of dip coated magnesium oxide nanoflower thin films

“…41 Hollow mesoporous MgO is synthesised from magnesium acetate tetrahydrate and ammonium oxalate. 42 A typical representative literature survey 1,15,[43][44][45][46][47][48][49] on synthesis of MgO and other NF structures in oxides is summarised in Table 1. It shows that there are reports on synthesis of ZnO, 45 CaO, 46 CeO 2 , 47 TiO 2 , 48 and SnO 2 49 NF structures.…”

“…41 Hollow mesoporous MgO is synthesised from magnesium acetate tetrahydrate and ammonium oxalate. 42…”