One-dimensional Bi2MoO6 nanotubes: controllable synthesis by electrospinning and enhanced simulated sunlight photocatalytic degradation performances

Abstract

One-dimensional Bi 2 MoO 6 nanotubes were successfully synthesized by the electrospinning technique in combination with the calcination process. The as-prepared samples were characterized by thermogravimetric and differential scanning calorimetry, Fourier transform-infrared spectroscope, microscopic Raman spectrometer, X-ray diffraction, scanning electron microscope, and transmission electron microscope. The hollow morphology of the Bi 2 MoO 6 nanotubes can be obtained after calcining the electrospun gel nanofibers. The results of the photocatalytic degradation tests show that the Bi 2 MoO 6 nanotubes possessed a much higher degradation rate of methylene blue than that of degussa P25. In particular, Bi 2 MoO 6 nanotubes calcined at 600°C for 2 h (marked as BMO-600) exhibited much higher photocatalytic activity than that of c-Bi 2 MoO 6 phase calcined at 500°C for 2 h (BMO-500) and that of c 0 -Bi 2 MoO 6 phase calcined at 700°C for 2 h (BMO-700) under simulated sunlight irradiation. The formation of the surface-phase junctions between low-temperature c-Bi 2 MoO 6 phase and high-temperature c 0 -Bi 2 MoO 6 phase may be responsible for the highest photocatalytic activity of the BMO-600 sample.

Electrochemical Performance of Chemically Integrated N-Doped Carbon Dots/Bi2MoO6 Nanocomposites for Symmetric Supercapacitors

“…The survey spectrum of BMO–C10 (Figure a) reveals the existence of Bi (∼9%), Mo (∼4.2%), O (∼25.7%), C (∼40%), and N (∼21.1%) elements without any impurities. In Figure b, the observed two strong peaks at binding energies of 158.9 and 164.2 eV corresponding to Bi 4f 7/2 and Bi 4f 5/2 , respectively, indicate the trivalent oxidation state for bismuth (Bi 3+ ) ions in the composite with a typical spin–orbit splitting value of 5.3 eV. ,, Similarly, spin–orbit splitting of Mo corresponding to Mo 3d 5/2 (232.2 eV) and Mo 3d 3/2 (235.4 eV) is observed in the Mo 3d spectrum, as shown in Figure c, which indicates that the Mo ions in BMO–C10 are in the +6 oxidation state with a spin–orbit splitting energy of 3.2 eV. − The deconvoluted core level spectrum of oxygen 1s spectrum (Figure d) showed two distinct peaks at 530.1 and 531.6 eV, corresponding to the metal–oxygen and surface-adsorbed OH groups, ,, respectively, which indicated that the oxidation state of oxygen ions in the system is −2. Similarly, Figure e shows the deconvoluted carbon 1s spectrum, where the three peaks at 284.7, 288.5, and 285.9 eV can be assigned to the graphitic or aliphatic C–C/CC, CO, and C–OH/C–O groups, , respectively.…”

Facile Formation of Bi2O2CO3/Bi2MoO6 Nanosheets for Visible Light-Driven Photocatalysis

“…Seeking new catalysts that can make full use of sunlight, especially the visible light portion, is a meaningful topic. Bi 2 MoO 6 , a nontoxic and visible light-responsive semiconductor, is promising for making photocatalysts. − Bi 2 MoO 6 photocatalysts with different morphologies or structures (e.g., nanoparticles, nanotubes, nanosheets, flowerlike structures, , and hollow microspheres , ) have been developed. However, the recombination of photogenerated carriers is still a serious problem when using pristine Bi 2 MoO 6 as a photocatalyst .…”

Facile Synthesis of Bi/Bi2MoO6/TiO2 Composite Nanofibers with enhanced Photocatalytic Activity Under Visible Light

“…紫外光; 自身光生电子-空穴对易复合, 又导致光量 子效率较低, 限制了其实际应用 [3][4] 。 铋基光催化材料以其独特的能带结构和较高的 光腐蚀稳定性而引起了广泛关注 [5] 。其中 Bi 2 MoO 6 性能稳定、带隙较窄(2.5~2.8 eV)、形貌可控, 已经 制备出纳米片 [6] 、纳米球 [7] 、纳米纤维 [8] 、纳米墙 [9] 、 纳米花 [10] 和纳米管 [11] 等不同形貌的 Bi 2 MoO 6 光催 化剂, 并证实其光催化性能与材料的形貌和电荷分 离效率密切相关。但纯 Bi 2 MoO 6 光吸收效率低、电 荷转移速率慢和光致电荷载流子复合几率高, 致使 其光催化性能仍不能满足实际应用需求 [12] 。 自 Awazu 等 [13] 首次提出贵金属表面等离子体光 催化, 并成功将金属 Au 纳米粒子应用于开发具有可 见光驱动的光催化材料以来, Au、Ag、Pt 等贵金属光 催化引起人们广泛的研究兴趣 [14][15][16][17] 。但是这些光催化 剂价格昂贵成为大规模推广应用的瓶颈, 而半金属 Bi 具有成本低、带隙小、能带重叠少等优点, 特别是当 Bi 颗粒小于几十纳米时, 能够产生与贵金属相似的表 面等离子体共振(SPR)效应 [18][19] , 成为贵金属表面等 离子体光催化最理想的替代品。近年来, 有关研究者…”