Synthesis and Photocatalytic Property of In2TiO5/In2O3 Heterostructures†

doi:10.7503/cjcu20150046

Abstract

Abstract:

In₂TiO₅/In₂O₃ heterostructures were synthesized by self-propagating combustion synthesis from raw materials Ti(OC₄H₉)₄, In(NO₃)₃, glycine and absorbent fiber. The obtained sample was characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), energy-dispersive spectroscopy(EDS) X-ray analysis, termogravimetric-differential thermal analysis(TG-DTA), UV-Visible diffuse reflectance spectroscopy(UV-Vis DRS) and N₂ adsorption-desorption isotherms. With Rhodamine B(RhB) as a model degradation compound, the photocatalytic activity of In₂TiO₅/In₂O₃ was investigated. The results showed that the mesoporous In₂TiO₅/In₂O₃ heterostructures were synthesized when the n(In)/n(Ti) ratio was 2∶1, the calcination temperature was 800 ℃ and the calcination time was 2 h. The In₂TiO₅/In₂O₃ heterostructures exhibited high photocatalytic activity under the irradiation of high pressure mercury lamp(125 W). The decolorization rate of 10 mg/L RhB can be up to 92.1% after 120 min of irradiation and the degrading reaction of RhB fits the first-order kinetic model. The photocatalytic performance of In₂TiO₅/In₂O₃ heterostructures was better than that of In₂TiO₅ under the same conditions. The In₂TiO₅/In₂O₃ heterostructure also has visible-light-driven photocatalytic activity.

Key words: In2TiO5/In2O3 heterostructure, Self-propagating combustion synthesis, Photocatalysis, Degradation

CLC Number:

O643

TrendMD:

ZHANG Qinku, YAO Binghua, LU Pan, PANG Bo, XIONG Min. Synthesis and Photocatalytic Property of In₂TiO₅/In₂O₃ Heterostructures^†[J]. Chem. J. Chinese Universities, 2015, 36(9): 1794.

Figures/Tables 12

Fig.1 XRD patterns of ITO(a) and ITO-IO(b) samples

Fig.2 SEM images of ITO-IO heterostructures

Fig.3 UV-Vis DRS spectra and (αhν)2-hν plots(inset) of ITO(a) and ITO-IO(b)

Fig.4 TG-DTA curves of ITO-IO precursor

Fig.5 N2 adsorption-desorption isotherms(A) and pore size distributions(B) of In2TiO5(a) and In2TiO5/In2O3(b)

Fig.6 Effect of light sources on photocatalytic activity of ITO-IO and ITO for RhB degradationc0=10 mg/L.

Fig.7 ln(c0/ct)-t curves of RhB with different initial concentrations with ITO-IO as catalyst

Table 1 Kinetic equations and parameters of photocatalytic degradation reaction of RhB under the irradiation of high pressure mercury lamp with ITO-IO as catalyst*

Initial concentration/(mg·L^-1)	Kinetics equation	R²	t_1/2/min	10³k_a/min^-1
5	ln(c₀/c_t)=0.0224t+0.0090	0.997	30.8	22.5
10	ln(c₀/c_t)=0.0210t-0.0864	0.991	33.0	21.0
15	ln(c₀/c_t)=0.0093t-0.0591	0.985	73.9	9.4
20	ln(c₀/c_t)=0.0044t-0.0486	0.962	157.5	4.4

Fig.8 UV-Vis absorptance spectra of RhB solution(c0=10 mg/L) at different degradation time under the irradiation of high pressure mercury lamp(A) and xenon lamp(B) with ITO-IO as catalystDegradation time/min: a. 0; b. 60; c. 120; d. 180.

Fig.9 UV-Vis absorptance spectra of levofloxcin lactate aqueous solution at different degradation time with ITO-IO as catalyst(A) and ct /c0-t curves with different catalysts(B)(A) Degradation time/min: a. 0; b. 20; c. 40; d. 60; e. 80; f. 100; g. 120; h. 150; i. 180. (B) a. ITO-IO; b. ITO; c. no photocatalyst.

Fig.10 PL spectra of TA solution under UV light irradiation with ITO-IO at different irradiation time(A) and with different samples at fixed time(180 min)(B)(A) Degradation time/min: a. 0, b. 60, c. 120, d. 180; (B) a. ITO; b. ITO-IO.

Fig.11 Schematic diagram of the charge separation and transfer of In2TiO5/In2O3 heterostructure photocatalyst

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Synthesis and Photocatalytic Property of In₂TiO₅/In₂O₃ Heterostructures^†

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