Photocatalytic studies under visiblelightirradiationusing nanosized β‐Bi2O3 are reported. β‐Bi2O3 nanoparticles are prepared starting from the well‐defined bismuth oxido cluster [Bi38O45(OMc)24(DMSO)9]⋅2 DMSO⋅7 H2O (OMc=O2CC3H5) using a straightforward hydrolysis and annealing protocol. Powder X‐ray diffraction studies, transmission electron microscopy, diffuse reflectance UV/Vis spectroscopy and
报道了使用纳米级 β-Bi 2 O 3在可见光照射下的光催化研究。β-Bi 2 O 3纳米颗粒是从明确定义的氧化铋簇 [Bi 38 O 45 (OMc) 24 (DMSO) 9 ]⋅2 DMSO⋅7 H 2 O (OMc=O 2 CC 3 H 5) 使用简单的水解和退火方案。粉末 X 射线衍射研究、透射电子显微镜、漫反射 UV/Vis 光谱和氮吸附测量(使用 Brunauer-Emmett-Teller (BET) 理论)用于表征所制备的 β-Bi 2 O 3 . 通过时间相关退火,微晶尺寸可以控制在 (17±2) nm 和 (45±5) nm 之间,BET 表面积为 7 到 29 m 2 g -1。所制备的 β-Bi 2 O 3的间接带隙为 (2.15±0.05) eV。罗丹明 B (RhB) 溶液的分解速率在 2.46×10 -5到 4.01×10 -4 s 范围内-1并且取决于微晶尺寸、催化剂的量和
Hierarchical BiOI nanostructures supported on a metal organic framework as efficient photocatalysts for degradation of organic pollutants in water
Photodegradation of rhodamine B in the presence of H2O2 by visiblelightover α‐Fe2O3 architectures has been investigated (see picture; left to right: 1D nanorods, 2D nanoplates, 3D nanocubes). A link between the exposed facets of α‐Fe2O3 architectures and their photoreactivity is established, following 110}>012}≫001}.
已经研究了可见光在α‐Fe 2 O 3结构上在H 2 O 2存在下若丹明B的光降解作用(参见图片;从左至右:1D纳米棒,2D纳米板,3D纳米立方体)。的α-Fe的暴露面之间的链路2点ö 3的体系结构和其光反应性建立后,以下110}> 012}»001}。
A visible light driven 3D hierarchical CoTiO<sub>3</sub>/BiOBr direct Z-scheme heterostructure with enhanced photocatalytic degradation performance
nanocomposites display enhanced photocatalytic performance toward dye decomposition. Particularly, CTBB-5 reveals the best photocatalytic efficiency for RhB removal with a K of 0.2030 min−1, which is about 50.75 and 3.02-fold higher than that of pure CoTiO3 and BiOBr, respectively. The outstanding activity is further demonstrated by MO photodegradation. The dramatically enhanced activity can be attributed
Photocatalytic application of nanosized CdS immobilized onto functionalized MWCNTs
作者:D. D. Chronopoulos、N. Karousis、S. Zhao、Q. Wang、H. Shinohara、N. Tagmatarchis
DOI:10.1039/c3dt53338g
日期:——
Nanosized semiconductor CdS immobilized onto modified multi-walled carbon nanotubes (MWCNTs) carrying poly(amidoamine) dendron units were visualized by HR-TEM. Evidently, spherical CdS nanoparticles 3–5 nm in diameter were identified. Moreover, EDX spectroscopy gave additional spectroscopic proof of the presence of CdS in the CdS-MWCNTs hybrid material. The photocatalytic activity of CdS-MWCNTs toward the decomposition of rhodamine B (RhB) was examined by monitoring spectral changes in the characteristic absorption band of RhB centred at 554 nm. The latter absorption band of RhB was found to continuously depress during visible light irradiation in the presence of CdS-MWCNTs, with faster kinetic rates as compared with the case when only reference CdS was present. The current result was rationalized in terms of efficient photoinduced electron-transfer from CdS to MWCNTs within the intrahybrid CdS-MWCNTs. In this frame, the suggested mechanism for the high and fast photocatalytic decomposition of RhB supports the accumulation of electrons in MWCNTs, which then react with molecular oxygen, thus reducing it to superoxide radical anion O2˙− responsible for the generation of the highly reactive species of HO˙ and HOO˙. The latter together with the holes generated in photoexcited CdS were responsible for the decomposition of RhB. Finally, the photocatalyst CdS-MWCNTs was recovered and efficiently reused for four consecutive catalytic cycles, thus highlighting its wider applicability in removing organic pollutants from water.