In2TiO5/In2O3异质结构的制备及光催化性能

doi:10.7503/cjcu20150046

高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (9): 1794.doi: 10.7503/cjcu20150046

In₂TiO₅/In₂O₃异质结构的制备及光催化性能

张钦库^1,², 姚秉华^1,³(), 鲁盼¹, 庞波¹, 熊敏¹

1. 西安理工大学应用化学系, 西安 710048
2. 榆林学院建筑工程系, 榆林 719000
3. 陕西省尾矿资源综合利用重点实验室(商洛学院), 商洛 726000

收稿日期:2015-01-16 出版日期:2015-09-10 发布日期:2015-08-21
作者简介:联系人简介: 姚秉华, 男, 博士, 教授, 主要从事功能材料研究. E-mail:bhyao@xaut.edu.cn
基金资助:
国家自然科学基金(批准号: 21276208)、陕西省尾矿资源综合利用重点实验室(商洛学院)开放基金(批准号: 2014SKY-WK003)、陕西省教育厅专项基金(批准号: 15JK1862)和西安理工大学博士学位论文创新基金资助

Synthesis and Photocatalytic Property of In₂TiO₅/In₂O₃ Heterostructures^†

ZHANG Qinku^1,², YAO Binghua^1,^3,^*(), LU Pan¹, PANG Bo¹, XIONG Min¹

1. Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China
2. Department of Building Engineering, Yulin University, Yulin 719000, China
3. Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources,Shangluo University, Shangluo 726000, China

Received:2015-01-16 Online:2015-09-10 Published:2015-08-21
Contact: YAO Binghua E-mail:bhyao@xaut.edu.cn
Supported by:
† Supported by the National Natural Science Foundtion of China(No.21276208), the Research Fund of Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources(Shangluo University), China(No.2014SKY-WK003), the Special Research Fund of Shannxi Provincial Department of Education, China(No.15JK1862) and the Research Fund for Innovation Doctoral Thesis of Xi’an University of Technology, China

摘要/Abstract

摘要：

以酞酸丁酯和硝酸铟为起始物, 甘氨酸为燃料, 脱脂纤维为模板, 采用自蔓延燃烧法制备了In₂TiO₅/In₂O₃异质结构半导体光催化剂. 利用X射线衍射仪、扫描电子显微镜、 X射线能量色散谱仪、热重-差热分析仪、紫外-可见漫反射光谱仪和氮气吸附-脱附仪等对样品进行了表征. 以罗丹明B(RhB)为目标降解物, 考察了催化剂的光催化性能. 结果表明, 在In/Ti摩尔比为2∶1、焙烧温度为800 ℃、焙烧时间为2 h条件下制备的介孔In₂TiO₅/In₂O₃光催化材料在高压汞灯(125 W)辐照下, 120 min可使10 mg/L RhB的脱色率达到92.1%, 降解过程服从一级动力学模型. 在相同的光催化条件下, In₂TiO₅/In₂O₃的光催化性能明显优于In₂TiO₅, 且In₂TiO₅/In₂O₃光催化剂还具有一定的可见光催化活性.

关键词: In2TiO5/In2O3异质结构, 自蔓延燃烧合成, 光催化, 降解

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

中图分类号:

O643

TrendMD:

张钦库, 姚秉华, 鲁盼, 庞波, 熊敏. In₂TiO₅/In₂O₃异质结构的制备及光催化性能. 高等学校化学学报, 2015, 36(9): 1794.

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

图/表 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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In₂TiO₅/In₂O₃异质结构的制备及光催化性能

Synthesis and Photocatalytic Property of In₂TiO₅/In₂O₃ Heterostructures^†

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