La2CoFeO6竹节状中空纳米纤维的制备及其光催化性能

doi:10.15541/jim20150143

摘要/Abstract

摘要：

采用静电纺丝法制得La₂CoFeO₆竹节状中空纳米纤维光催化材料。La₂CoFeO₆纳米纤维具有稳定的一维结构, 由菱形晶型的La₂CoFeO₆纳米颗粒相互连接组成, 并存在明显的竹节状中空结构, 其比表面积可达98.7 m²/g。La₂CoFeO₆纳米纤维对自然光具有较高的利用率, 其禁带宽度为1.6 eV。在甲基橙溶液浓度为10 mg/L, pH为2, 催化剂用量为1.5 g/L条件下, 自然光光照2 h后, La₂CoFeO₆纳米纤维对甲基橙的降解率可达96.9%。

关键词: La2CoFeO6纳米纤维, 静电纺丝, 光催化, 中空结构, 自然光

Abstract:

La₂CoFeO₆ bamboo-like hollow nanofibers photocatalytic material was successfully prepared by electrostatic spinning. La₂CoFeO₆ nanofibers, which were connected to each other by rhombic La₂CoFeO₆ nanoparticles, had stable one-dimensional structure and clear bamboo-like hollow structure. The specific surface area of as-prepared inorganic nanofibers reached 98.7 m²/g. La₂CoFeO₆ nanofibers had a high utilization for natural light and its band gap was 1.6 eV. When concentration of methyl orange was 10 mg/L with pH of 2 and the dosage of La₂CoFeO₆ nanofibers was 1.5 g/L, methyl orange was degraded by La₂CoFeO₆ nanofibers within 2 h under natural light at 96.9%.

Key words: La2CoFeO6 nanofibers, electrostatic spinning, photocatalysis, hollow structure, natural light

中图分类号:

O643

毕军, 吴艳波, 赵恒彦, 魏斌斌. La₂CoFeO₆竹节状中空纳米纤维的制备及其光催化性能[J]. 无机材料学报, 2015, 30(10): 1031-1036.

BI Jun, WU Yan-Bo, ZHAO Heng-Yan, WEI Bin-Bin. Preparation and Photocatalytic Properties of La₂CoFeO₆Bamboo-like Hollow Nanofibers[J]. Journal of Inorganic Materials, 2015, 30(10): 1031-1036.

图/表 9

图 1 La2CoFeO6纳米纤维的XRD图谱

Fig. 1 XRD pattern of La2CoFeO6 nanofibers

图 2 不同放大倍数下的La2CoFeO6纳米纤维的FE-SEM图片

Fig. 2 FE-SEM images of La2CoFeO6 nanofibers at different magnification

图 3 La2CoFeO6纳米纤维FT-IR谱图

Fig. 3 FT-IR spectrum of La2CoFeO6 nanofibers

图 4 La2CoFeO6纳米纤维的TEM照片 (a, b)、选区电子衍射图案(c)和高分辨率透射电镜照片(d)

Fig. 4 TEM images (a, b), SEAD pattern (c) and HRTEM image (d) of La2CoFeO6 nanofibers

图 5 La2CoFeO6竹节状中空纳米纤维的N2吸脱附等温线和孔径分布曲线(插图)

Fig. 5 N2 adsorption-desorption isotherms and pore size distribution curves (inset) of La2CoFeO6 bamboo-like hollow nanofibers

图 6 La2CoFeO6竹节状中空纳米纤维的UV-Vis谱图

Fig. 6 UV-Vis spectra of La2CoFeO6 bamboo-like hollow nanofibers

图 7 不同条件下甲基橙溶液(pH=5~6)的降解率变化曲线

Fig. 7 Degradation rate curves of methyl orange solution (pH=5-6) under different conditions

图 8 催化剂加入量(a)和溶液pH(b)对La2CoFeO6竹节状中空纳米纤维光催化性能的影响

Fig. 8 Effect of catalyst amount (a) and solution pH (b) on the photocatalytic properties of La2CoFeO6 bamboo-like hollow nanofibers

图 9 La2CoFeO6竹节状中空纳米纤维的光催化稳定性

Fig. 9 Photocatalytic stability of La2CoFeO6 bamboo-like hollow nanofibers

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La₂CoFeO₆竹节状中空纳米纤维的制备及其光催化性能

Preparation and Photocatalytic Properties of La₂CoFeO₆Bamboo-like Hollow Nanofibers

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