Visible Light Photocatalysis of Ni-Deposited TiO2 Nanotubes for Methyl Orange Degradation in Alkaline Medium

doi:10.1007/s40195-015-0269-x

Abstract

Abstract:

The photocatalysis of TiO₂ nanotubes (Ti/TNT) and Ni-deposited TiO₂ nanotubes (Ti/TNT-Ni) for methyl orange degradation was investigated. Methyl orange was selected as the model pollutant, and its photocatalytic degradation was determined in 1 mol/L KOH solution. Ti/TNT was produced by anodizing method, and the electrodeposition of nickel on TNT was performed galvanostatically. The characterization of electrodes was performed by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction analysis. The electrochemical behavior of the electrodes was determined by cyclic voltammetry and electrochemical impedance spectroscopy. The irradiation was applied by visible light source (λ = 635 nm) for 48 h. UV/vis spectroscopy was used for determination of the concentration of methyl orange. Furthermore, after 48-h irradiation, the solutions were analyzed by Fourier transform infrared spectroscopy. Results showed that the concentration of methyl orange decreased from 100 ppm (10^-6) to 16 ppm, after 48-h irradiation with the photocatalysis of Ti/TNT-Ni.

Key words: Photocatalysis, Ni-deposited, TiO2, nanotubes, (Ti/TNT-Ni), Methyl, orange

Başak Doğru Mert, Birgül Yazıcı. Visible Light Photocatalysis of Ni-Deposited TiO₂ Nanotubes for Methyl Orange Degradation in Alkaline Medium[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(7): 858-865.

Figures/Tables 10

Fig. 1 SEM images of Ti a, Ti/TNT b and Ti/TNT-Ni c electrodes before immersion, the insets are the cross-sectional views [25] The surface micrographs of all electrodes after 48-h irradiation in MO + KOH solutions are presented in Fig. 2. It can be concluded that the alkaline medium influenced the electrodes, and several damages were detected which due to corrosion. In Fig. 2a, corrosion products disperse heterogeneously on Ti surface. Deformations and cracks are seen in Fig. 2b, and oxide particles are plugged into the TNT’s mouth. Other sides, TNT-Ni surface was less influenced than the others (Fig. 2c).

Fig. 2 SEM images of Ti a, Ti/TNT b and Ti/TNT-Ni c electrodes after 48-h irradiation

Fig. 3 EDX spectra of Ti a, Ti/TNT b and Ti/TNT-Ni c electrodes after 48-h irradiation

Fig. 4 XRD spectra of Ti a, Ti/TNT b and Ti/TNT-Ni c electrodes after 48-h irradiation

Fig. 5 Cyclic voltammograms of Ti a, Ti/TNT b and Ti/TNT-Ni c electrodes in the absence (open circle) and presence (filled circle) of 100 ppm MO in 1 mol/L KOH

Fig. 6 Nyquist plots of Ti (filled circle, open circle), Ti/TNT (filled square, open square) and Ti/TNT-Ni (filled triangle, open triangle) at 0.8 V (vs. Ag/AgCl) in the absence a and presence b of 100 ppm MO in 1 mol/L KOH, where the solid lines are the fitted lines, and the electrical equivalent circuit diagram in a is used to modeling the metal/solution interface

Table 1 Equivalent circuit elements for electrodes in 1 M KO in the absence and presence of 100 ppm MO

Electrode	KOH			MO + KOH
Electrode	R _p (Ω/cm^-2)	n	C _dl (μF/cm²)	R _p (Ω/cm^-2)	n	C _dl (μF/cm²)
Ti	22,104	0.95	75.69	44,379	0.94	32.68
Ti/TNT	16,959	0.94	23.51	37,569	0.92	24.67
Ti/TNT-Ni	9920	0.94	5.01	2009	0.60	21.40

Fig. 7 UV spectra of MO + KOH solution after 48-h irradiation under the conditions of without electrode, with Ti, Ti/TNT and Ti/TNT-Ni electrodes

Fig. 8 Methyl orange concentration as a function of irradiation time

Fig. 9 FTIR spectra of MO + KOH solutions after 48-h irradiation under the conditions of without electrode, with Ti, Ti/TNT and Ti/TNT-Ni electrodes

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Visible Light Photocatalysis of Ni-Deposited TiO₂ Nanotubes for Methyl Orange Degradation in Alkaline Medium

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