Alternative Bi precursor effects on the structural, optical, morphological and photocatalytic properties of BiOI nanostructures

Abstract

BiOI nanostructures were synthetized through a hydrothermal process using either bismuth acetate or subsalicylate as Bi precursor. Regardless of the used Bi source, the same crystalline structure of BiOI was obtained; nevertheless, the nature of the Bi precursor had an evident impact in the color appearance of the obtained sample. Another notable difference was observed in the resulting morphology, where ∼1.6 μm flowerand dandelion-like shapes were obtained for acetate and subsalicylate, respectively; both structures assembled by around 30 nm thick nanoflakes with rounded and straight edge, respectively. UV-vis diffuse reflectance shows an energy gap around 1.8 eV. Raman spectroscopy confirms also the tetragonal phase of BiOI. The photocatalytic activity was evaluated through degradation of methyl orange dye using visible and UV light sources, comparing results with P25 TiO 2 . Both BiOI nanostructures presented an improvement of photocatalytic activity when irradiated with visible light, having the best photoactivity the sample synthetized with bismuth acetate.

Femtosecond relaxation dynamics of two‐dimensional BiOI nanoplatelets as efficient photocatalysts

“…The band-gap values of BiOI samples are typically sensitive to the synthetic procedure and the thickness of the films. [31] The values of E g determined for the BiOI NP sample in this report are consistent with the literature. [4,31] High-resolution X-ray photoelectron spectra (XPS) of BiOI nanoplatelet samples shown in Figure 2 display signals associated with elements Bi 4f (Figure 2a), O 1s (Figure 2b), and I 3d (Figure 2c).…”

“…[31] The values of E g determined for the BiOI NP sample in this report are consistent with the literature. [4,31] High-resolution X-ray photoelectron spectra (XPS) of BiOI nanoplatelet samples shown in Figure 2 display signals associated with elements Bi 4f (Figure 2a), O 1s (Figure 2b), and I 3d (Figure 2c). The XPS of Bi show two lines associated with Bi 3+ 4f 7/2 and 4f 5/2 at $159.9 and 165.2 eV, respectively.…”

Fast fabrication of bismuth oxyiodide/carbon‐nanofibers composites for efficient anti‐proliferation of liver and breast cancer cells

“…The SEM images (Figure 2) presented nanosheets assembled to form a rose‐like configuration. The obtained results resemble the conventional flaky structure of BiOI mentioned in previous literature [39,40] . Compared with earlier studies, the pure BiOI‐nanosheets prepared by FRM were thinner than what as they did not exceed 15 nm.…”

A readily synthesized bismuth oxyiodide/attapulgite for the photodegradation of tetracycline under visible light irradiation

“…43 The Raman peak around 310 cm −1 corresponds to O-atoms gained from the laser irradiation during the Raman measurement. 44 Interestingly, the peak around 310 cm −1 seldom appears in BIA- x , presumably due to the addition of ATP causing BiOI to be not highly sensitive to the laser irradiation. The above results demonstrate the successful formation of BIA- x , and BiOI has become more stable since the ATP was added.…”