α-MoO3纳米带的制备及模拟燃油光催化氧化脱硫活性

doi:10.15541/jim.20140523

摘要/Abstract

摘要：

采用简单的水热法获得了一维结构的α-MoO₃纳米带, 利用XRD、SEM、TEM、EDS和UV-Vis-DRS光谱等测试手段对其相组成、形貌、纯度和光吸收特性进行表征。以噻吩模拟含硫污染物探讨了α-MoO₃纳米带对模拟FCC汽油的光催化氧化脱硫( Photo-Cat-ODS) 活性及其光催化氧化脱硫机理。结果表明: 一维α-MoO₃纳米带有利于抑制光生电子和空穴的复合, 对模拟FCC汽油光催化脱硫活性远高于商品MoO₃和商品二氧化钛(P25), 可见光光照240 min模拟汽油FCC的脱硫率达到86.9%。

关键词: 水热法, α-MoO3纳米带, 光催化氧化, 脱硫

Abstract:

1 D α-MoO₃ nanobels were prepared by facile hydrothermal synthesis. Phase, morphology, purity and optical adsorption properties of as-synthesized samples were investigated by XRD, SEM, TEM, EDS and UV-Vis-DRS spectra. Furthermore, thiophene was selected as a typical pollutant of simulated fuel to evaluate the photocatalytic oxidative desulfurization (Photo-Cat-ODS) activity of as-prepared 1 D α-MoO₃ nanobelt and the mechanism for the photocatalytic oxidation of thiophene was explored. The photocatalysis experimental results indicate that photocatalytic oxidative desulfurization activity of 1 D α-MoO₃ nanobelts is better than that of purchased MoO₃ and P25 due to their reducing recombination of photogenerated electron-hole pairs. The desulfurization rate of simulated FCC fuel reaches 86.9% under visible light irradiation for 240 min.

Key words: hydrothermal synthesis, α-MoO3 nanobelt, photocatalytic oxidative, desulfurization

中图分类号:

TQ174

甄延忠, 李静, 王丹军, 付峰, 薛岗林. α-MoO₃纳米带的制备及模拟燃油光催化氧化脱硫活性[J]. 无机材料学报, 2015, 30(4): 408-412.

ZHEN Yan-Zhong, LI Jing, WANG Dan-Jun, FU Feng, XUE Gang-Lin. Synthesis of α-MoO₃Nanobelt and Its Photocatalytic Oxidative Desulfurization(Photo-ODS) Activity of Simulation Fuel[J]. Journal of Inorganic Materials, 2015, 30(4): 408-412.

图/表 6

图1 α-MoO3纳米带的XRD图谱

Fig. 1 XRD patterns of as-synthesized α-MoO3 nanobelts

图2 α-MoO3纳米带的SEM照片(插图为EDS图谱)(a)和TEM照片(插图为SAED图谱)(b)

Fig. 2 SEM image (a) (with an inset showing the corresponding EDS spectrum) and TEM image (b) (with an inset showing the corresponding SAED pattern) of α-MoO3 nanobelts

图3 商品MoO3和α-MoO3的UV-Vis漫反射吸收光谱(a) 和(αhυ)2-hυ图(b)

Fig. 3 UV-Vis diffuse reflectance spectra (a) and (αhυ)2 vs hv plats (b) of commercial MoO3 and as-prepared α-MoO3 nanobelts

图4 催化剂用量对FCC汽油光催化氧化脱硫活性的影响

Fig. 4 Photocatalytic activity of photocatalys with different concentrations under visible-light irradiation

图5 可见光照射下α-MoO3纳米带与商品MoO3和P25的光催化氧化脱硫活性对比

Fig. 5 Comparsion of visible-light-driven photocatalytic activity of α-MoO3 nanobelt, commercial MoO3 and P25

图6 α-MoO3纳米带光催化氧化噻吩机理图

Fig. 6 Schematic diagram of mechanism for the photocatalytic oxidation of thiophene on α-MoO3 nanobelt

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α-MoO₃纳米带的制备及模拟燃油光催化氧化脱硫活性

Synthesis of α-MoO₃Nanobelt and Its Photocatalytic Oxidative Desulfurization(Photo-ODS) Activity of Simulation Fuel

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