Preparation and characterization of SiO2-pillared H2Ti4O9 and its photocatalytic activity for methylene blue degradation.
Preparation and characterization of SiO2-pillared H2Ti4O9 and its photocatalytic activity for methylene blue degradation.
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DOI：
10.1016/j.jhazmat.2008.09.045
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发表时间：
2009-05
影响因子：
13.6
通讯作者：
Fang Jiang;Zheng Zheng-Zheng;Zhaoyi Xu;Shourong Zheng
中科院分区：
文献类型：
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作者：
Fang Jiang;Zheng Zheng-Zheng;Zhaoyi Xu;Shourong Zheng
采用有机硅烷插层法制备了SiO2柱撑层状钛酸盐（SiO2-H2 Ti4 O 9）。采用XRD、N2吸附-脱附等温线、紫外-可见光谱、红外光谱和拉曼光谱对材料进行了表征。以亚甲基蓝（MB）水溶液为降解对象，考察了SiO2-H2 Ti4 O 9的光催化活性。XRD和比表面积测试结果表明，SiO2-H2 Ti4 O 9的层间距为1.45nm，比表面积为148 m2 g −1。SiO2-H2 Ti4 O 9的紫外-可见吸收光谱显示出红移，表明与K2 Ti4 O 9相比，SiO2-H2 Ti4 O 9的带隙更窄。此外，SiO2-H2 Ti4 O 9对MB的吸附性能优于H2 Ti4 O 9和K2 Ti4 O 9。在实验条件下，H2 Ti4 O 9、K2 Ti4 O 9和SiO2-K2 Ti4 O 9对MB的光催化降解均遵循零级动力学，SiO2-H2 Ti4 O 9的光催化活性是K2 Ti4 O 9的3倍，这可能是由于SiO2柱撑层状钛酸盐的层间距和比表面积增加所致。
SiO2pillared layered titanate (SiO2–H2Ti4O9) was prepared via intercalating organosilanes into the interlayers of the layered K2Ti4O9followed by calcination at 500°C. The resulting materials were characterized using XRD, N2adsorption–desorption isotherms, UV–vis spectra, IR spectroscopy and Raman spectroscopy. The photocatalytic activity of SiO2–H2Ti4O9was evaluated by photocatalytic degradation of aqueous methylene blue dye (MB). XRD and specific surface area results showed that SiO2–H2Ti4O9had an interlayer distance of 1.45nm and a specific surface area of 148m2g−1. UV–vis absorption spectrum of SiO2–H2Ti4O9showed a red shift, indicative of a narrower band gap compared to K2Ti4O9. In addition, SiO2–H2Ti4O9showed higher MB adsorption capacity compared to H2Ti4O9and K2Ti4O9. MB photodegradation over H2Ti4O9, K2Ti4O9and SiO2–K2Ti4O9followed zero-order kinetics under our experimental conditions, and the photocatalytic activity of SiO2–H2Ti4O9was found to be three times higher than that of K2Ti4O9, which could be attributed to the increase of interlayer space and specific surface area of SiO2-pillared layered titanate.