Bi2O3修饰的BiPO4纳米棒复合催化剂可见光光催化性能的研究

doi:10.15541/jim20140106

摘要/Abstract

摘要：

以Bi₂S₃纳米棒为模板合成了形貌可控的BiPO₄ 纳米棒复合光催化剂。在可见光辐射下, 该复合催化剂表现出优异的光催化降解亚甲基蓝(MB)的性能。UV-Vis漫反射谱结果表明: 催化剂经过Bi₂O₃修饰后对可见光有很好吸收; X射线衍射仪和透射电镜等表征结果表明, 所制备的BiPO₄ 纳米催化剂为直径约30 nm、长约200~500 nm的纳米棒。表面修饰少量Bi₂O₃可明显促进光催化剂对亚甲基蓝(MB)的可见光降解效率, 其活性是未修饰催化剂的1.7倍。光电流和N₂吸附实验也表明表面修饰后的催化剂光电流和BET比表面积都明显增加。这可能是由于表面修饰的Bi₂O₃不仅显著提高了BiPO₄ 纳米棒复合催化剂的可见光吸收, 而且在BiPO₄表面起到了富集电子和传输电子的作用。结果表明表面修饰Bi₂O₃的BiPO₄ 纳米棒是一种高活性的光催化材料。

关键词: BiPO4纳米棒, Bi2O3修饰, 光催化, 形貌可控

Abstract:

BiPO₄ nanorod composite photocatalyst with controllable morphology was synthesized by using Bi₂S₃ nanorods as a template. This composite catalyst exhibited excellent photocatalytic performance for methylene blue (MB) degradation under visible light irradiation. UV-Vis diffuse reflectance spectroscopy results showed that the Bi₂O₃modified BiPO₄catalyst had higher visible light absorption. X-ray diffraction and transmission electron microscopy results indicated that as-prepared BiPO₄ catalyst was nanorods with diameter of about 30 nm and length of 200-500 nm. Surface modification with small amount Bi₂O₃ could significantly promote visible light degradation efficiency of MB, which was about 1.7 times higher than that of the unmodified BiPO₄catalyst. Photocurrent and N₂ adsorption experiments showed that the photocurrent and BET specific surface area increased significantly after surface modification. Bi₂O₃modification not only enhanced visible light absorption ability of catalyst but also presented a center for the enhancement of electron transfer. The results showed BiPO₄ catalyst with Bi₂O₃ modification was a high activity photocatalytic material.

Key words: BiPO4 nanorod, Bi2O3 modification, photocatalysis, controllable morphology

中图分类号:

TQ174

杜全超, 吕功煊. Bi₂O₃修饰的BiPO₄纳米棒复合催化剂可见光光催化性能的研究[J]. 无机材料学报, 2014, 29(11): 1204-1210.

DU Quan-Chao, Lü Gong-Xuan. Visible Light Photocatalytic Properties of Bi₂O₃ Modified BiPO₄ Nanorod Composite Photocatalyst[J]. Journal of Inorganic Materials, 2014, 29(11): 1204-1210.

图/表 10

图1 Bi2S3 纳米棒的TEM照片(a)和高分辨照片(b)及其EDS能谱(c)和XRD图谱(d)

Fig. 1 TEM image at low magnification (a), HRTEM image (b), EDS spectrum (c) and XRD pattern (d) of Bi2S3 nanorods

图2 样品S1和S2的XRD图谱

Fig. 2 XRD patterns of S1 and S2

图3 S1 和S2 的XPS 总谱和各元素的高分辨XPS能谱

Fig. 3 The XPS survey spectra and the high-resolution XPS spectra of the S1 and S2 samples (a) The XPS survey spectra of sample S1 and S2; (b) High-resolution XPS spectra of Bi 4f in sample S1 and S2; (c) High-resolution XPS spectra of P 2p in sample S1 and S2; (d) The fitting curves of high-resolution XPS spectra for Bi 4f of sample S2

表1 样品S2中Bi 4f 的XPS数据

Table 1 XPS data of Bi 4f in sample S2

Peak	Area fit	Center /eV
1	3450.66	158.6
2	135987.13	160.1
3	4431.80	163.9
4	108638.16	165.4

图4 样品S1和S2的TEM照片(A和a), 高分辨TEM 照片(B 和 b)和EDS能谱(C和c)

Fig. 4 TEM (A and a), HRTEM (B and b) images and EDS spectra (C and c) of S1 and S2 samples

图5 样品S1和S2的紫外漫反射图谱

Fig. 5 UV-Vis diffuse reflectance spectroscopy of S1 and S2 samples

表2 样品S1和S2的BET数据

Table 2 The BET data of S1 and S2

Samples	S_BET/(m²·g^-1)	V_pore/(cm³·g^-1)	d_pore/nm
S1	2.609	0.039	5.933
S2	6.104	0.077	10.15

图6 样品S1和S2的瞬态光电流-时间曲线(反应条件: 0.1 mol/L K2SO4的20 (V/V)%乙醇水溶液, λ>420 nm)

Fig. 6 The transient photocurrent-time curves of samples S1 and S2 Reaction conditions: 20 (V/V)% ethanol aqueous solution with 0.1 mol/L K2SO4, λ>420 nm

图7 S1和S2 对亚甲基蓝溶液的光降解效率

Fig. 7 Light degradation efficiency of S1 and S2 in methylene blue solution The light source is a xenon lamp, cut-off filter λ> 420 nm, the concentration of methylene blue is 10-5 g/L

图8 S2存在下光降解MB溶液的循环实验

Fig. 8 Cyclic experiments of MB degradation over sample S2

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Bi₂O₃修饰的BiPO₄纳米棒复合催化剂可见光光催化性能的研究

Visible Light Photocatalytic Properties of Bi₂O₃ Modified BiPO₄ Nanorod Composite Photocatalyst

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