Abstract
Bismuth molybdate (Bi2MoO6) nanostructures has attracted many researches as an advanced photocalysts for the organic contaminants. In this paper, bismuth molybdate Bi2MoO6 nanoparticles were synthesized using a simple hydrothermal method at varied pH (2, 4, 6, 8, and 10) for 15h at 180°C. The results reveal the variation pH precursor solutions have a significant impact on the morphology, phase formations, and photocatalytic activity of samples. The synthesized samples at low pH level were characterized by FESEM analysis revealing Bi2MoO6 nanoplates have formed while gradually convert to Bi2MoO6 spherical nanoparticle at high PH level as shown in energy dispersive X-ray spectroscopy (DES) peaks. The X-ray diffraction patterns reveal characteristic peaks corresponding to mixed phases of Bi2MoO6 and cubic Bi4MoO9 at high pH value. The optical absorption study exhibit Bi2MoO6 nanoplates absorbed visible light with blue shift when compared to the cubic Bi4MoO9 structures. Moreover, the photocatalytic activity results revealed that nanoplates in pH = 4 sample has excellent photocatalytic activity for degradation of rhodamine (RhB), methylene orange (MO), and phenol under visible-light irradiation (λ > 400nm) as well as exhibit the photodegradation 90% of phenol within 300min.
Highlights
Photocatalysis procedure under solar light has exceptionally attracted and interested of researchers because it has the ability of splitting the water molecules and decomposing the organic contaminants (Miao, Pan et al 2013, Phuruangrat, Putdum et al 2015, Peng, Ye et al 2021, Ramasamy, Jeyadharmarajan et al 2021)
The Bi2MoO6, as an n-type semiconductor, with 2.6–2.9 eV, has been attracted for many previous papers as excellent photocatalyst (Zhao, Liu et al 2016). the crystal structure is layers of perovskite (Am−1BmO3m+1) and bismuth oxide (Bi2O2 2+), which are stacked together and have excellent photocatalytic activity when exposed to visible light because it has spatial photoinduced charge separation, which have been extensively investigated as potential catalysts for accelerating the decomposition of organic pollutants such as phenol, rhodamine B (RhB), methylene orange (MO) n-butene, and methylene blue by converting them into CO2 and H2O via photogenerated electron-hole pairs (Dumrongrojthanath, Thongtem et al 2015, Meng and Zhang 2017)
Bi2MoO6, Bi2MoO6/Bi4MoO9 composites, and Bi4MoO9 are the three main compositions resulted in the samples synthesized at pH levels ranging from 2 to 10
Summary
Photocatalysis procedure under solar light has exceptionally attracted and interested of researchers because it has the ability of splitting the water molecules and decomposing the organic contaminants (Miao, Pan et al 2013, Phuruangrat, Putdum et al 2015, Peng, Ye et al 2021, Ramasamy, Jeyadharmarajan et al 2021). The crystal structure is layers of perovskite (Am−1BmO3m+1) and bismuth oxide (Bi2O2 2+), which are stacked together and have excellent photocatalytic activity when exposed to visible light because it has spatial photoinduced charge separation, which have been extensively investigated as potential catalysts for accelerating the decomposition of organic pollutants such as phenol, rhodamine B (RhB), methylene orange (MO) n-butene, and methylene blue by converting them into CO2 and H2O via photogenerated electron-hole pairs (Dumrongrojthanath, Thongtem et al 2015, Meng and Zhang 2017). We have adopted strategy to control the form and morphology of Bismuth Molybdate by adjust pH, the reaction has carried out by hydrothermal and the photocatalytic activities were tested for photodegrade dye and phenol
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