Enhanced Visible-light-driven Photocatalytic Activity of Multiferroic KBiFe2O5 by Adjusting pH Value

doi:10.15541/jim20170610

Abstract

Abstract:

Multiferroic KBiFe₂O₅ was successfully prepared by a facile hydrothermal method. Its phase purity and morphology were investigated by powder X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The visible-light absorption was confirmed by UV-Vis diffuse reaction spectroscopy (UV-Vis DRS). Effect of pH value on visible-light-driven photocatalytic properties of KBiFe₂O₅ was evaluated by degrading rhodamine B (RhB) and methyl orange (MO). It can be found that lower pH value contributed to smaller average particle size. The D₅₀of the sample at pH 7 is about 10 times larger than that at pH 2. Acid condition is beneficial to the dispersion of KBiFe₂O₅ nanoparticles, which leads to an enhanced photocatalytic performance. Photocatalytic activity of KBiFe₂O₅ is significantly improved by decreasing pH value of the solution, which is attributed to the promoted dispersion of catalyst particles in the suspension and the enhanced adsorption of dye molecules on the catalyst surface.

Key words: KBiFe₂O₅, photocatalyst, visible-light irradiation, pH value

CLC Number:

X703

LI Jian, ZHANG Gang-Hua, FAN Li-Kun, HUANG Guo-Quan, GAO Zhi-Peng, ZENG Tao. Enhanced Visible-light-driven Photocatalytic Activity of Multiferroic KBiFe₂O₅ by Adjusting pH Value[J]. Journal of Inorganic Materials, 2018, 33(7): 805-810.

Figures/Tables 5

Fig. 1 XRD patterns of as-grown KBiFe2O5 and after degradation at pH 2

Fig. 2 FE-SEM image (a, b), diffuse reflection spectrum (c), and (F(R)hv)2 against hv (d) of KBiFe2O5

Fig. 3 Degradation rates of RhB (a) and MO (b) using KBiFe2O5 at different pH values, and absorption changes of RhB (c) and MO (d) solution in photocatalytic process at pH 2

Fig. 4 Corresponding reaction rate constant k for the photocatalytic degradation of RhB (a) and MO (b) by KBiFe2O5 at various pH value, and circulating runs in the photocatalytic degradation of RhB (c) and MO (d) at pH 2

Table 1 Average particle size of KBiFe2O5 in suspensions at various pH values

Sample	pH=2	pH=3.5	pH=5	pH=7
D₅₀/μm	0.341	0.654	1.576	2.796

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Enhanced Visible-light-driven Photocatalytic Activity of Multiferroic KBiFe₂O₅ by Adjusting pH Value

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