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Xu, Lei,Qin, Chuanxiang,Wan, Yingpeng,Xie, Hongde,Huang, Yanlin,Qin, Lin,Seo, Hyo Jin Elsevier 2017 JOURNAL- TAIWAN INSTITUTE OF CHEMICAL ENGINEERS Vol.71 No.-
<P><B>Abstract</B></P> <P> <I>A</I> <SUB>2</SUB>NiWO<SUB>6</SUB> (<I>A</I> =Ca, Sr) double perovskite semiconductors were prepared via the sol–gel method. The crystal phases were confirmed via X-ray powder diffraction (XRD) measurements together with Rietveld refinements. The morphological and chemical properties of the samples were investigated by the scanning electron microscope (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and the specific surface area measurements. The optical absorptions and the band structures of the two double perovskites were discussed based on the on the experimental results and theoretical calculation. The d–d allowed transitions in Ni<SUP>2</SUP> <SUP>+</SUP>–O octahedra have great contributions to the narrow band-gap. The Ni<SUP>2+</SUP>-containing tungstate perovskites were potential photocatalysts, which are efficient for its photodegradation for methylene blue (MB) under the irradiation of visible light (λ<ce:italic/>> 420nm). The photocatalytic activities were attributed to the special structure properties and multivalent Ni and W ions in the perovskite lattices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>A</I> <SUB>2</SUB>NiWO<SUB>6</SUB> (<I>A</I> =Ca, Sr) nano-perovskite were prepared via the sol–gel method. </LI> <LI> The crystalline crystal structure was refined. </LI> <LI> The optical absorption and band structure were clarified. </LI> <LI> The photocatalysis activities were discussed on structural properties. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Liu, Xuanxuan,Qin, Chuanxiang,Huang, Yanlin,Qin, Lin,Seo, Hyo Jin Elsevier 2017 JOURNAL- TAIWAN INSTITUTE OF CHEMICAL ENGINEERS Vol.78 No.-
<P><B>Abstract</B></P> <P>Ag-containing niobate AgNb<SUB>13</SUB>O<SUB>33</SUB> has been prepared by the sol–gel polymerized complex method. The structure was investigated via a good XRD Rietveld refinement in a typical perovskite-like framework. The morphological properties of the AgNb<SUB>13</SUB>O<SUB>33</SUB> nanoparticles were tested via transmission electron microscopy (TEM), scanning electron microscope (SEM), and energy dispersive spectra (EDS) measurements. AgNb<SUB>13</SUB>O<SUB>33</SUB> is a typical direct allowed semiconductor with band energy of 2.81 eV, which is much narrower than 3.4 eV of Nb<SUB>2</SUB>O<SUB>5</SUB>. This silver niobate can harvest both UV and near UV light, which is benefited from the (O-2p/Ag-4d) hybridization in the valence band. The photocatalytic abilities of AgNb<SUB>13</SUB>O<SUB>33</SUB> nanoparticles were reported. The sample presents more efficient photocatalytic effects on photo-degradation of methylene blue (MB) dye solutions than that of Nb<SUB>2</SUB>O<SUB>5</SUB>. The photocatalytic mechanism was discussed on band energy levels, trapping experiments, photoluminescence and the decay lifetime.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new silver-containing niobate nanoparticle AgNb<SUB>13</SUB>O<SUB>33</SUB> was prepared. </LI> <LI> Typical perovskite-like structure was verified by Rietveld refinements. </LI> <LI> AgNb<SUB>7</SUB>O<SUB>18</SUB> shows an efficient absorption with a narrow gap 2.81 eV. </LI> <LI> AgNb<SUB>7</SUB>O<SUB>18</SUB> has an efficient photocatalytic activity on MB photo-degradation. </LI> <LI> AgNb<SUB>13</SUB>O<SUB>33</SUB> has more advanced photocatalytic activities than Nb<SUB>2</SUB>O<SUB>5</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A silver niobate photocatalyst AgNb<sub>7</sub>O<sub>18</sub> with perovskite-like structure
Liu, XuanXuan,Qin, Chuanxiang,Cao, Lei,Feng, Yongyi,Huang, Yanlin,Qin, Lin,Seo, Hyo Jin Elsevier 2017 Journal of Alloys and Compounds Vol.724 No.-
<P><B>Abstract</B></P> <P>Silver-containing niobate AgNb<SUB>7</SUB>O<SUB>18</SUB> nanoparticles were prepared via sol-gel polymerized complex synthesis. The sample was given a good XRD Rietveld refinement in a typical perovskite-like structure. The detailed surface properties of AgNb<SUB>7</SUB>O<SUB>18</SUB> nanoparticles were tested by SEM, EDS, TEM, nitrogen adsorption-desorption isotherms and XPS measurements. AgNb<SUB>7</SUB>O<SUB>18</SUB> is characterized via a direct transition and the band energy is 2.76 eV. The hybridization between O 2p and Ag 3d states in valence band contributes to the narrowed band gap. The first principles electronic structure elucidation supports the narrow band gap of AgNb<SUB>7</SUB>O<SUB>18</SUB>. The sample shows an efficient degradation of methylene blue dye (MB) solutions. The trapping tests were performed to elucidate the real active species in the photocatalytic reactions. The results indicate that the superoxide radical is the main active species in the photocatalytic system, and the photocatalyst also shows a good stability and durability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new semiconductor nanoparticle AgNb<SUB>7</SUB>O<SUB>18</SUB> was prepared. </LI> <LI> The silver niobate has a typical perovskite-like structure. </LI> <LI> AgNb<SUB>7</SUB>O<SUB>18</SUB> shows an efficient absorption with a narrow gap 2.76 eV. </LI> <LI> AgNb<SUB>7</SUB>O<SUB>18</SUB> has an efficient photocatalytic activity on MB photo-degradation. </LI> <LI> The photocatalysis mechanism and stabilities were discussed. </LI> </UL> </P>
Xu, Jian,Qin, Chuanxiang,Huang, Yanlin,Wang, Yaorong,Qin, Lin,Seo, Hyo Jin Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.396 No.-
<P><B>Abstract</B></P> <P>Pure and V<SUP>5+</SUP>-doped Bi<SUB>6</SUB>Mo<SUB>2</SUB>O<SUB>15</SUB> (3Bi<SUB>2</SUB>O<SUB>3</SUB>·2MoO<SUB>3</SUB>) photocatalysts were synthesized through electrospinning, followed by low-temperature heat treatment. The samples developed into nanoparticles with an average size of approximately 50nm. The crystalline phases were verified via X-ray powder diffraction measurements (XRD). The surface properties of the photocatalysts were studied by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analyses. The UV–vis spectra showed that V doping in Bi<SUB>6</SUB>Mo<SUB>2</SUB>O<SUB>15</SUB> shifted the optical absorption from the UV region to the visible-light wavelength region. The energy of the band gap of Bi<SUB>6</SUB>Mo<SUB>2</SUB>O<SUB>15</SUB> was reduced by V doping in the lattices. The photocatalytic activities of the pure and V-doped Bi<SUB>6</SUB>Mo<SUB>2</SUB>O<SUB>15</SUB> were tested through photodegradation of rhodamine B (RhB) dye solutions under visible light irradiation. Results showed that 20 mol% V-doped Bi<SUB>6</SUB>Mo<SUB>2</SUB>O<SUB>15</SUB> achieved efficient photocatalytic ability. RhB could be degraded by V-doped Bi<SUB>6</SUB>Mo<SUB>2</SUB>O<SUB>15</SUB> in 2h. The photocatalytic activities and mechanisms were discussed according to the characteristics of the crystal structure and the results of EIS and XPS measurements.</P> <P><B>Highlights</B></P> <P> <UL> <LI> V<SUP>5+</SUP>-doped Bi<SUB>6</SUB>Mo<SUB>2</SUB>O<SUB>15</SUB> was synthesized by the electrospinning preparation. </LI> <LI> The band gap energy of Bi6Mo12O15 was greatly reduced by V-doping in the lattices. </LI> <LI> V-doped Bi<SUB>6</SUB>Mo<SUB>2</SUB>O<SUB>15</SUB> shows high activity in RhB degradation under visible light. </LI> <LI> Crystal structure of Bi<SUB>6</SUB>Mo<SUB>2</SUB>O<SUB>15</SUB> is favorable for high photocatalytic capacity. </LI> </UL> </P>
Liu, Xuanxuan,Huang, Yanlin,Qin, Chuanxiang,Seo, Hyo Jin Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.427 No.1
<P><B>Abstract</B></P> <P>In<SUB>4</SUB>FeTi<SUB>3</SUB>O<SUB>13.5</SUB> (InTi<SUB>0.75</SUB>Fe<SUB>0.25</SUB>O<SUB>3.375</SUB>) semiconductor was prepared via sol-gel citrate-complexation synthesis. This ferrotitanate derives from a solid-solution with InFeO<SUB>3</SUB>:In<SUB>2</SUB>Ti<SUB>2</SUB>O<SUB>7</SUB> =2:3. Phase formation and crystal structure of the sample were confirmed via XRD Rietveld refinement. Structural analyses indicated that there were two dimensional layers in the structure. The mutual repulsion in the layers induces great displacements of oxygen ions. The optical properties of In<SUB>4</SUB>FeTi<SUB>3</SUB>O<SUB>13.5</SUB> nanoparticles were investigated. The direct allowed band gap (2.56eV) shows a characteristic charge-transfer (CT) transitions of (O2p+Fe3d)→(Ti/Fe)3d in visible-light region. The band structure and energy positions were discussed. In<SUB>4</SUB>FeTi<SUB>3</SUB>O<SUB>13.5</SUB> nanoparticles are demonstrated to be efficient for the photodegradation of Rhodamine B (RhB) under visible light irradiation (λ>420nm). The photocatalytic activities were attributed to the special layer structure and the catalytic mediators of multivalent Ti<SUP>4+/3+</SUP> and Fe<SUP>3+/2+</SUP> confirmed by XPS measurements.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new ferrotitanate semiconductor In<SUB>4</SUB>FeTi<SUB>3</SUB>O<SUB>13.5</SUB> nanoparticles were prepared. </LI> <LI> Rietveld refinement was given in monoclinic layered structure. </LI> <LI> Special 2D layered structure reduced the visible light optical absorption. </LI> <LI> The direct allowed band transitions were reported. </LI> <LI> Multivalent Fe<SUP>3+/2+</SUP> ions were confirmed by calculations and experiments. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Hydrothermal synthesis and optical properties of CsV<sub>3</sub>O<sub>8</sub> microplates
Mi, Longqing,Huang, Yanlin,Qin, Chuanxiang,Qin, Lin,Seo, Hyo Jin Elsevier 2018 Journal of luminescence Vol.194 No.-
<P><B>Abstract</B></P> <P>Nano-sized V<SUB>2</SUB>O<SUB>5</SUB> has been widely investigated as photocatalysis due to good chemical stability and smaller band gap than TiO<SUB>2</SUB>. However, it suffers some disadvantages such as narrow optical absorption, easy recombination of photo-generated charges. In this work, CsV<SUB>3</SUB>O<SUB>8</SUB> was prepared by a facile hydrothermal synthesis without help of any additive inorganic chemicals. The samples developed into well-crystalized microplates with the length and width of about 1 and 3µm, respectively. Phase formation and structure were investigated by XRD structure refinement. CsV<SUB>3</SUB>O<SUB>8</SUB> has an unusual V–O framework consisting of VO<SUB>6</SUB> octahedra, which constructs V<SUB>2</SUB>O<SUB>5</SUB>-like layer-structure. The samples were characterized with SEM, TEM, EDS and optical absorption. CsV<SUB>3</SUB>O<SUB>8</SUB> has an indirect allowed electronic transition with band energy 2.18eV. Efficient photo-degradation of Rhodamine B (RhB) solutions in presence of CsV<SUB>3</SUB>O<SUB>8</SUB> was confirmed. The result suggests that vanadate semiconductor CsV<SUB>3</SUB>O<SUB>8</SUB> is a potential candidate for photocatalytic application under visible-light irradiation.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Liu, Xuanxuan,Xu, Lei,Huang, Yanlin,Qin, Chuanxiang,Qin, Lin,Seo, Hyo Jin Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.15
<P><B>Abstract</B></P> <P>This work improved the optical absorption and photocatalytic ability of four-layered Aurivillius Bi<SUB>5</SUB>Ti<SUB>3</SUB>FeO<SUB>15</SUB> through microstructural modification via partial substitution of Ti<SUP>4+</SUP> with Fe<SUP>3+</SUP>. Bi<SUB>5</SUB>Ti<SUB>3−x</SUB>Fe<SUB>1+x</SUB>O<SUB>15</SUB> (x = 0–0.6) photocatalysts were prepared through sol-gel citrate-complexation synthesis. The sample crystallized into plate-like nanoparticles with [001] facets. Phase formation and crystal structure were confirmed via X-ray powder diffraction (XRD) Rietveld refinements. Bi<SUB>5</SUB>Ti<SUB>3−x</SUB>Fe<SUB>1+x</SUB>O<SUB>15</SUB> (x = 0–0.6) maintained its structural characteristic, i.e., a perovskite unit of (Bi<SUB>3</SUB>Ti<SUB>3−x</SUB>Fe<SUB>1+x</SUB>O<SUB>13</SUB>)<SUP>2–</SUP> sandwiched by two (Bi<SUB>2</SUB>O<SUB>2</SUB>)<SUP>2+</SUP> layers along <I>c</I> axis. The samples were investigated via scanning electron microscope (SEM), transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDX), and specific surface area analyses. The band gap showed characteristic transitions from the valence band (VB) of (O2p+Fe<I>t</I> <SUB>2g</SUB>+Bi6s) to the conduction band (CB) of (Ti-3d+Fe-<I>e</I> <SUB>g</SUB>). With increasing substitution of Ti<SUP>4+</SUP> with Fe<SUP>3+</SUP>, the sample greatly red shifted its absorption edges. The d–d transitions in FeO<SUB>6</SUB> greatly contribute to the narrow band-gap. Aurivillius is a potential photocatalyst and demonstrated photodegradation of Rhodamine B (RhB) under visible light irradiation (λ > 420nm). Such photocatalytic activities were attributed to the special structural layer and the catalytic mediators of multivalent Ti<SUP>4+/3+</SUP> and Fe<SUP>3+/2+</SUP> ions in the perovskite slabs as confirmed by XPS measurements. Results suggested that substitution of Ti<SUP>4+</SUP> with Fe<SUP>3+</SUP> in an Aurivillius phase was an efficient method to modify the bandwidth and structure of Aurivillius phase. This phenomenon can be used as a strategy to improve the photochemical properties of Ti/Fe-containing Aurivillius phases.</P>
Xia Wang,Changcun Wu,Jun Sun,Chuanxiang Qin,Jianjun Wang,Qiqi Zhuo,Lixing Dai 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
This study introduces a facile method to prepare syndiotactic poly(vinyl alcohol) (s-PVA) fibers containing singlewalledcarbon nanotubes (SWNTs) from the corresponding composite dispersions with tea polyphenols (TP) as dispersantunder high-speed shear flow. The formation of the composite fibrous precipitates at high shear rate is largely facilitated by theSWNTs in the dispersions and slight flow resistance. Interestingly, the obtained s-PVA/SWNTs composite precipitatespossess a three-level hierarchical structure, that is, a single fiber is assembled by fibrils which are composed of microfibrils ofs-PVA-coated SWNTs. And the s-PVA fibrous precipitates containing high amounts of SWNTs could be obtained by shearingthe dispersion with relatively low SWNTs loadings, as a result, the composite fiber containing 20.7 wt% SWNTs wasprepared from the dispersion with 10.0 wt% SWNTs. In addition, with the increase of SWNTs loadings, the amount of theprecipitates increases, but crystallinity of the precipitates decreases instead.
Di Hu,Chao Xiao,Xia Wang,Xike Xiong,Jun Sun,Qiqi Zhuo,Jianjun Wang,Chuanxiang Qin,Lixing Dai 한국섬유공학회 2019 Fibers and polymers Vol.20 No.12
Nanofiller reinforcement is an effective approach to realize high performance of regular synthetic fibers. In thispaper, graphene oxide nanoribbons (GONRs) with complete morphology were prepared via unzipping single-walled carbonnanotubes (SWCNTs) through long-time freeze-drying after oxidation. GONRs derived from SWCNTs (SGONRs) did notneed any modification and could be directly added to poly(vinyl alcohol) (PVA) to form uniform dispersions and thencontinuous fibers were fabricated using wet spinning and hot-drawing. SGONRs provided abundant hydrogen bondinginteraction with PVA chains, so SGONRs could not only obviously improve the dispersibility in PVA, but also enhance themechanical properties of the composites. The tensile strength of PVA/SGONRs composite fibers with 0.4 wt% loading ofSGONRs reach 1032 MPa, improved by 121 % compared with PVA/SWCNTs fiber, and by 200 % with PVA fiber,respectively.