简易合成Bi/Bi2MoO6/TiO2复合纳米纤维及其增强的可见光催化性能

doi:10.15541/jim20180564

摘要/Abstract

摘要：

以电纺TiO₂纳米纤维为基质, 葡萄糖为还原剂, 采用简单一步溶剂热法制备了等离子体Bi/Bi₂MoO₆/TiO₂复合纳米纤维。利用X射线衍射、场发射扫描电镜、透射电子显微镜、X射线光电子能谱、紫外-可见漫反射光谱和光致发光谱等对样品进行表征。以RhB和4-CP为模拟有机污染物, 评价材料的光催化性能。结果表明: 部分Bi ³⁺被葡萄糖还原成金属Bi纳米粒子, 原位沉积在Bi₂MoO₆纳米片上, 同时构筑在TiO₂纳米纤维表面。金属Bi的等离子体共振效应, 有效提高了样品的光催化活性。可见光照50 min, 样品对RhB的降解率为95.8%, 五次循环后仍保持在92%以上; 可见光照180 min, 样品对4-CP的降解率达68.8%。证实该材料具有良好的可见光催化活性和稳定性。

关键词: 金属Bi, 等离子体共振效应, 复合纳米纤维, 可见光催化

Abstract:

The plasma Bi/Bi₂MoO₆/TiO₂ composite nanofibers were prepared via a facile one-step solvothermal method, using electrospun TiO₂ nanofibers as substrate, and glucose as reducing agent. The photocatalytic activity of the samples were evaluated by photodegradation of rhodamine B and 4-chlorophenol solution under visible light irradiation. The results showed that metal Bi nanoparticles were generated on the surface of Bi₂MoO₆ nanosheets via reduction of Bi ³⁺ in situ by glucose, meanwhile grew on the TiO₂ nanofibers surface. The photocatalytic activity of the Bi/Bi₂MoO₆/TiO₂ composites nanofibers can be further improved by depositing metallic Bi owing to its surface plasmon resonance. The RhB catalyzed by the sample was degraded by 95.8% under visible light irradiation for 50 min, and the degradation efficiency remained over 92% after 5 cycles while the 4-CP was degraded for 68.8% under visible light irradiation for 180 min. All above results suggest that the photocatalysts have good photocatalytic activity and stability.

Key words: metal Bi, plasma resonance effect, composite nanofibers, visible light photcatalysis

中图分类号:

O643

李晓萍, 李跃军, 曹铁平, 孙大伟, 王霞, 席啸天. 简易合成Bi/Bi₂MoO₆/TiO₂复合纳米纤维及其增强的可见光催化性能[J]. 无机材料学报, 2019, 34(11): 1193-1199.

LI Xiao-Ping, LI Yue-Jun, CAO Tie-Ping, SUN Da-Wei, WANG Xia, XI Xiao-Tian. Facile Synthesis of Bi/Bi₂MoO₆/TiO₂ Composite Nanofibers with Enhanced Photocatalytic Activity under Visible Light[J]. Journal of Inorganic Materials, 2019, 34(11): 1193-1199.

图/表 11

图1 不同样品的XRD图谱

Fig. 1 XRD patterns of different samples a: TiO2; b: BM/TO; c: Bi/BM/TO

图2 TiO2(a)、BM/TO(b)和Bi/BM/TO(c)的SEM照片和样品Bi/BM/TO的EDS能谱图(d)

Fig. 2 SEM images of TiO2 (a), BM/TO (b), Bi/BM/TO (c) and EDS pattern of sample Bi/BM/TO (d)

图3 样品BM/TO(a, b)和Bi/BM/TO(c~f)的TEM和HRTEM照片

Fig. 3 TEM and HRTEM images of sample BM/TO(a, b) and Bi/BM/TO(c-f)

图4 样品Bi/BM/TO的XPS谱图

Fig. 4 XPS spectra of sample Bi/BM/TO (a) Survey scan; (b) Bi4f; (c) Mo3d; (d) Ti2p; (e) O1s

图5 不同样品的UV-Vis DRS谱图

Fig. 5 UV-Vis diffuses reflectance spectra of different samples

图6 不同样品的荧光(PL)光谱图

Fig. 6 PL spectra of different samples

图7 不同样品的瞬态光电流响应图

Fig. 7 Photocurrent of different samples

图8 不同样品可见光催化降解RhB(a)和一级动力学(b)曲线

Fig. 8 Degradation curves of RhB by different samples under visible light irradiation (a) and corresponding first-order kinetics (b)

图9 不同样品可见光催化降解4-CP(a)和一级动力学(b)曲线

Fig. 9 Degradation curves of 4-CP by different samples under visible light irradiation (a) and corresponding first-order kinetics (b)

图10 可见光下Bi/BM/TO对RhB光催化的循环实验

Fig. 10 Cycling runs of the photocatalytic degradation of RhB over Bi/BM/TO under visible irradiation

图11 示意图1 样品Bi/BM/TO可见光催化降解及能带结构图

Fig. 11 Scheme 1 Proposed photocatalytic mechanism for photodegradation of organic pollutants over Bi/BM/TO

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简易合成Bi/Bi₂MoO₆/TiO₂复合纳米纤维及其增强的可见光催化性能

Facile Synthesis of Bi/Bi₂MoO₆/TiO₂ Composite Nanofibers with Enhanced Photocatalytic Activity under Visible Light

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