Co-reporter:Dahu baiyila, Xiaohui Wang, Xin Li, Bao sharileaodu, Xiaotian Li, Liang Xu, Zongrui Liu, Limei Duan and Jinghai Liu
Journal of Materials Chemistry A 2014 vol. 2(Issue 31) pp:12304-12310
Publication Date(Web):02 Jun 2014
DOI:10.1039/C4TA02224F
TiO2 nanofibers integrating space-separated magnetic nanoparticles and heterostructures have been fabricated to construct multifunctional photocatalysts with excellent photocatalytic activity and magnetic recoverability. The electrospinning technique has been employed to prepare the Fe3O4-embedded TiO2 (Fe3O4@TiO2) magnetic nanofibers. TiO2/CdS heterostructures (Fe3O4@TiO2/CdS) formed by depositing CdS nanoparticles onto the Fe3O4@TiO2 nanofibers have been obtained by a hydrothermal process. The heterostructures improve the photocatalytic activity and widen the range of solar light response. Under visible light irradiation, the photocatalytic activity of the Fe3O4@TiO2/CdS nanofibers is 5.11 times higher than that of the Fe3O4@TiO2 nanofibers and is 1.22 times than that of CdS nanoparticles. In addition, it exhibits a slight increase under simulated solar light with the photocatalytic degradation ratio 1.1 times higher than that under visible light. The loading amounts of CdS only have effects on the photocatalytic activity under visible light and simulated solar light. The Fe3O4@TiO2/CdS nanofiber exhibits a saturation magnetization strength of 1.572 emu g−1 and can be effortlessly separated and recovered by applying a contactless magnetic field. The cycling stability is durable after magnetic separation and recycling.
Co-reporter:Yue Chi, Jinchun Tu, Minggang Wang, Xiaotian Li, Zhankui Zhao
Journal of Colloid and Interface Science 2014 Volume 423() pp:54-59
Publication Date(Web):1 June 2014
DOI:10.1016/j.jcis.2014.02.029
•Controllable formation of mesoporous Ag/carbon composites by a “one-pot” assembly strategy.•Large specific surface area, high content of nanosized Ag can be easily obtained and tuned.•Excellent catalytic activity toward the reduction of 4-nitrophenol.Ordered mesoporous silver nanoparticle/carbon composites have been produced by a “one-pot” synthesis method. They have open mesopores (4.2–5.0 nm), large specific surface areas (465–584 m2 g−1) and high pore volumes (0.29–0.50 cm3 g−1) and contain stable, confined but accessible Ag nanoparticles. As a result, they show high performance in catalytic reduction of 4-nitrophenol (4-NP). The mesostructure and particle size as a function of Ag content were studied and correlated with the catalytic activity. The ordered mesoporous carbon framework and highly dispersed Ag nanoparticles make the material a novel system for effective contacting with the reactants and catalysis of the reaction.
Co-reporter:Wei Wang, Nan Li, Yue Chi, Yanjuan Li, Wenfu Yan, Xiaotian Li, Changlu Shao
Ceramics International 2013 Volume 39(Issue 4) pp:3511-3518
Publication Date(Web):May 2013
DOI:10.1016/j.ceramint.2012.10.175
Abstract
Bismuth ferrite (BiFeO3) nanofibers were prepared by combining the electrospinning technique with sol–gel chemistry. The structural features of the as-prepared nanofibers were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The obtained BiFeO3 nanofibers showed a rhombohedral perovskite structure after getting annealed in an argon atmosphere. Both SEM and TEM results showed that BiFeO3 fibers were composed of nanocrystalline particles. The photocatalytic behaviors of BiFeO3 nanofibers were investigated by the degradation of Rhodamine B (RhB). BiFeO3 nanofibers exhibited excellent catalytic activity under UV light irradiation, as well as under visible light irradiation in the presence of H2O2. The catalyst was further examined by magnetic measurement. The BiFeO3 nanofibers exhibited a ferromagnetic behavior at room temperature, which was associated with the nanometer-size of BiFeO3 particles. This provides an easy and efficient way to recover BiFeO3 photocatalysts from the suspension system by applying an external magnetic field.
Co-reporter:Yue Chi, Liang Zhao, Qing Yuan, Xiao Yan, Yanjuan Li, Nan Li and Xiaotian Li
Journal of Materials Chemistry A 2012 vol. 22(Issue 27) pp:13571-13577
Publication Date(Web):16 May 2012
DOI:10.1039/C2JM31854G
The precise control of the surface chemistry, assembly processing, and size of each component is crucial to the construction of integrated functional nanocomposites. This article develops a novel in situ auto-reduction route, by which well dispersed silver nanoparticles can be easily fabricated in ordered mesoporous carbon. The mesoporous carbon functionalized with carboxylate groups was used to anchor glycol to form a novel reducing species (COOCH2CH2OH), on which Ag(NH3)2NO3 could be reduced in situ. Highly dispersed and small-sized Ag nanoparticles were thus obtained. The well designed composite has large surface area (836 m2 g−1), highly open mesopores (∼4.2 nm), and stably confined but accessible Ag nanoparticles and, as a result, shows a high performance in the catalytic reduction of 4-nitrophenol (4-NP).
Co-reporter:Yue Chi, Wangchang Geng, Liang Zhao, Xiao Yan, Qing Yuan, Nan Li, Xiaotian Li
Journal of Colloid and Interface Science 2012 Volume 369(Issue 1) pp:366-372
Publication Date(Web):1 March 2012
DOI:10.1016/j.jcis.2011.12.051
Highly ordered mesoporous carbon functionalized with carboxylate groups and magnetic nanoparticles has been successfully synthesized. By oxidative treatment using (NH4)2S2O8 and H2SO4 mixed solution, numerous hydrophilic groups were created in the mesopores without destroying the ordered mesostructure of CMK-3. Through the in situ reduction in Fe3+, magnetic nanoparticles were successfully introduced into the mesopores, resulting in the multifunctional mesoporous carbon Fe-CMK-3. The obtained hybrid carbon material possesses ordered mesostructure, high Brunauer–Emmett–Teller (BET) surface area up to 1013 m2/g, large pore volume of about 1.16 cm3/g, carboxylic surface, and excellent magnetic property. When used as an adsorbent, Fe-CMK-3 exhibits excellent performances for removing toxic organic compounds from waster-water, with a high adsorption capacity, an extremely rapid adsorption rate, and an easy magnetically separable process. In the case of requiring emergency removal of large amount of organic pollutants in aqueous, the hybrid carbon adsorbent would be an ideal choice.Graphical abstractHighlights► Ordered mesoporous carbon functionalized with carboxylate groups and magnetic nanoparticles. ► The functionalizations of mesoporous carbon material lead to an enhanced adsorption performance. ► Carboxylic functional groups result in an extremely rapid adsorption rate. ► Magnetic nanoparticles endow the mesoporous carbon with an easy magnetically separable process.
Co-reporter:Yue Chi, Qing Yuan, Yanjuan Li, Jinchun Tu, Liang Zhao, Nan Li, Xiaotian Li
Journal of Colloid and Interface Science 2012 Volume 383(Issue 1) pp:96-102
Publication Date(Web):1 October 2012
DOI:10.1016/j.jcis.2012.06.027
In this work, we report a facile method to generate core–shell structured Fe3O4@SiO2–Ag magnetic nanocomposite by an in situ wet chemistry route with the aid of polyvinylpyrrolidone as both reductant and stabilizer. This method can effectively prevent Ag nanoparticles from aggregating on the silica surface, thus resulting highly dispersed and small-sized Ag nanoparticles. The as-prepared nanocomposite is composed of a central magnetite core with a strong response to external fields, an interlayer of SiO2, and numerous highly dispersed Ag nanoparticles with a narrow size distribution. Furthermore, the Fe3O4@SiO2–Ag nanocomposite showed high performance in the catalytic reduction of 4-nitrophenol and could be easily recycled by applying an external magnetic field while maintaining the catalytic activity without significant decrease even after running 15 times.Graphical abstractHighlights► Constructing core–shell structured Fe3O4@SiO2–Ag magnetic nanocomposite. ► Small and highly dispersed Ag nanoparticles with a narrow size distribution. ► An easy magnetically separable and recoverable process. ► An excellent catalytic activity toward the reduction of 4-nitrophenol.
Co-reporter:Mina Guli, Li Zhang, Jianxi Yao, Xiaotian Li
Powder Technology 2012 Volume 219() pp:271-275
Publication Date(Web):March 2012
DOI:10.1016/j.powtec.2011.12.061
A pluronic template of rod-like mesoporous silica was removed by extraction, calcination, and microwave digestion methods. The results of X-ray diffraction and Fourier Transform Infrared Spectroscopy spectra analyses confirmed that microwave digestion was the most efficient method to remove the template because of its convenience, speed, and effectiveness. The pore surface of rod-like SBA-15 was modified by an organic silane with terminal amino groups. Also Rhodamine 6G dye molecules were grafted onto the mesopore walls of rod-like SBA-15 before and after modification. Blue-shifts in photoluminescence, pore features in N2 adsorption–desorption, transmission electron microscopy results of blank rod-like SBA-15, dye doping rod-like SBA-15 before and after modification confirmed that the mesoporous SBA-15 that had been modified by the organic silane with terminal amino groups was more effective for grafting of Rhodamine 6G molecules because the structures still remained as ordered mesostructures after grafting.The pluronic template of rod-like meso-structure silica mesoporous material that had been modified by the organic silane with terminal amino groups was more effective for grafting of Rhodamine 6G dye molecules because the structures still remained as ordered mesostructures after grafting.Highlights► A template of mesoporous silica was removed by the most efficient microwave digestion method. ► The pore surface of rod-like SBA-15 was modified by an organic silane with terminal amino groups. ► Rhodamine 6G dye molecules were grafted onto the mesopore walls of SBA-15 before and after modification. ► The mesoporous silica that had been modified was more effective for grafting of dye molecules.
Co-reporter:Qing Yuan, Nan Li, Wangchang Geng, Yue Chi, Xiaotian Li
Materials Research Bulletin 2012 47(9) pp: 2396-2402
Publication Date(Web):
DOI:10.1016/j.materresbull.2012.05.031
Co-reporter:Qing Yuan, Nan Li, Wangchang Geng, Yue Chi, Jinchun Tu, Xiaotian Li, Changlu Shao
Sensors and Actuators B: Chemical 2011 160(1) pp: 334-340
Publication Date(Web):
DOI:10.1016/j.snb.2011.07.057
Co-reporter:Jinchun Tu, Nan Li, Xiaoyong Lai, Yue Chi, Yujie Zhang, Wei Wang, Xiaotian Li, Jixue Li, Shilun Qiu
Applied Surface Science 2010 Volume 256(Issue 16) pp:5051-5055
Publication Date(Web):1 June 2010
DOI:10.1016/j.apsusc.2010.03.055
Abstract
Pt-doped mesoporous indium oxide (In2O3) has been successfully obtained by a simple and effective in situ nanocasting method. The resultant samples were characterized by XRD, FE-SEM, TEM, N2 physisorption, XPS and EDX. The gas sensing properties for hydrogen sulfide (H2S) of the Pt-doped mesoporous In2O3 specimens were also examined. The results exhibit those In2O3 specimens possess much higher response to H2S even at low concentration of 2 ppm and a lower optimum working temperature of 150 °C. A possible mechanism was also provided to explain the improvement of the sensing properties.
Co-reporter:Yue Chi, Nan Li, Jinchun Tu, Yujie Zhang, Xiaotian Li, Changlu Shao
Journal of Luminescence 2010 Volume 130(Issue 3) pp:512-515
Publication Date(Web):March 2010
DOI:10.1016/j.jlumin.2009.10.023
Polymer resin and polymer-silica films with highly ordered mesostructure have been used as host materials to encapsulate DCM (4-(dicyanomethylene) -2-methyl-6-(4-dimethylaminostyryl)-4h-pyran), a kind of fluorescent dye, through evaporation-induced self-assembly method (EISA). After encapsulation, the composites show significant blue-shift in photoluminescence (PL) spectra. Particularly, by changing the excitation wavelength, the samples show different emission bands. These phenomena are related to the mesostructure and the positions of DCM molecules in the host.
Co-reporter:Mina Guli, Xiaotian Li, Yue Chen, Hong Ding, Jixue Li, Shilun Qiu
Materials Research Bulletin 2010 45(1) pp: 1-5
Publication Date(Web):
DOI:10.1016/j.materresbull.2009.09.013
Co-reporter:Mina Guli;Kan Zhang;Yue Chi
Journal of Sol-Gel Science and Technology 2010 Volume 54( Issue 3) pp:329-334
Publication Date(Web):2010 June
DOI:10.1007/s10971-010-2199-4
Large, flawless and transparent silica monoliths were prepared at room temperature by solvent evaporation method and loaded with dye. The composites containing dye molecules were characterized by X-ray diffraction, transmission electron microscopy, Uv–vis and photoluminescence spectra. A red-shift in photoluminescence spectrum was observed from the composite monolith compared with that of laser dye in C2H5OH solution. The property of laser narrowing has been shown when the composites are pumped at p = 355 nm by nitrogen laser.
Co-reporter:Qing Yuan, Nan Li, Jinchun Tu, Xiaotian Li, Rui Wang, Tong Zhang, Changlu Shao
Sensors and Actuators B: Chemical 2010 Volume 149(Issue 2) pp:413-419
Publication Date(Web):19 August 2010
DOI:10.1016/j.snb.2010.06.036
Mesoporous ZnO–SiO2 composites with various Si/Zn molar ratios were synthesized through a simple one-pot sol–gel method and their humidity sensing properties were also examined. Compared with pure SBA-15, ZnO–SiO2 composite shows improved humidity sensing properties and the introducing level of ZnO has a great influence on the humid sensitivity of ZnO–SiO2 composites. The results exhibited that the sample with Si/Zn = 1 showed better humidity sensing properties than others within the range of 11–95% relative humidity (RH). Its impedance changed by more than four orders of magnitude over the whole humidity range. The response and recovery time were about 50 s and 100 s, respectively. High sensitivity and low hysteresis were also observed. A possible mechanism was suggested to explain the humidity sensitive properties.
Co-reporter:F.Y. Bai, X.T. Li, G.S. Zhu, Y.H. Xing
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2010 Volume 75(Issue 5) pp:1388-1393
Publication Date(Web):May 2010
DOI:10.1016/j.saa.2009.12.074
A new complex of oxovanadium(IV), V2O2[(HB(pz)3)2(pyrro)2 (1) and a dimer-dithio carboxyl compound (C5H8NS2)2 (2) have been synthesized by the reaction of VOSO4·nH2O with NaHB(pz)3 and pyrrolidine dithio carboxylic acid ammonium salt. They were characterized by element analysis, IR spectra, UV–vis spectra and X-ray diffraction. Structural analyses of 1 and 2 gave the following parameters: 1, triclinic, P-1, a = 7.732(4) Å, b = 14.285(8) Å, c = 17.802(9) Å, α = 101.314(8)°, β = 92.682(9)°, γ = 92.228(9)°, V = 1923.6(18) Å3, and Z = 4; 2, monoclinic, C2/c, a = 13.857(2) Å, b = 10.4213(18) Å, c = 9.436(2) Å, β = 97.099(2), V = 1352.1(4) Å3, and Z = 4. In complex 1, vanadium atom adopts a distorted tetragonal bipyramid structure, which is typical for oxovanadium(IV) complexes. Compound 2 is a dimer-dithio carboxyl compound with S–S bond. In addition, thermal analysis was performed for analyzing the stabilization of the complexes.
Co-reporter:Qing Yuan, Wangchang Geng, Nan Li, Jinchun Tu, Rui Wang, Tong Zhang, Xiaotian Li
Applied Surface Science 2009 Volume 256(Issue 1) pp:280-283
Publication Date(Web):15 October 2009
DOI:10.1016/j.apsusc.2009.08.016
Abstract
K2CO3-SBA-15 with different K2CO3 content was prepared by thermal dispersion. The structures of resultant powders were characterized by XRD, N2 adsorption and IR. The humidity sensing properties of the powders were also investigated. Compared with pure SBA-15, K2CO3-SBA-15 shows improved humidity sensing properties and the introducing level of K2CO3 has a great influence on the humid sensitivity of K2CO3-SBA-15 composites. The optimal mixing ratio was K2CO3-SBA-15 (0.8 g/g), which exhibited excellent linearity in the whole range of 11–95%RH, a resistance variation of about five orders of magnitude, and a rapid response time and recovery time about 15 and 50 s, respectively. The mechanism of the humidity sensitive properties was also discussed.
Co-reporter:Jinchun Tu, Nan Li, Qing Yuan, Rui Wang, Wangchang Geng, Yanjuan Li, Tong Zhang, Xiaotian Li
Synthetic Metals 2009 Volume 159(23–24) pp:2469-2473
Publication Date(Web):December 2009
DOI:10.1016/j.synthmet.2009.08.014
A simple chemical method was employed to form Fe2+ doped polypyrrole (PPY) by the introduction of hydrated ferric chloride (FeCl3·6H2O) during the polymerization of pyrrole, where FeCl3·6H2O played a role of oxidant for the polymerization and the in situ forming reduced product (FeCl2·2H2O) was well doped in PPY. The resultant Fe2+ doped PPY species were characterized by using various techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and field emission scanning electronic microscope (FE-SEM). Humidity-sensitive properties of the samples were also examined. The Fe2+ doped PPY exhibited a fast response to humidity change (about 20 s), in which great changes of more than three orders (nearly four) of magnitude in impedance was observed when relative humidity was varied over the whole range. The improved properties may be related to the presence of the hydrophilic Fe2+, and a possible mechanism was also provided.
Co-reporter:Jinchun Tu, Nan Li, Yue Chi, Songnan Qu, Chunxu Wang, Qing Yuan, Xiaotian Li, Shilun Qiu
Materials Chemistry and Physics 2009 Volume 118(2–3) pp:273-276
Publication Date(Web):15 December 2009
DOI:10.1016/j.matchemphys.2009.08.009
Rhodamine B (Rh B), a kind of fluorescent dye, was encapsulated into the pores of various mesoporous silica materials through postgrafting method. Small angle X-ray diffraction (XRD), nitrogen adsorption–desorption and Fourier transform infrared (FTIR) spectrometry were used to characterize those composites. After encapsulation, the composites showed significant blue-shift in photoluminescence (PL) spectra. The extent of shift changed upon varying mesoporous silica host. This phenomenon is related to the topological structure of mesopores. For the first time, it was observed that not only the size, but also the structure and the curvature of the mesopores have a great influence on PL properties of the composites, and a possible mechanism was also provided.
Co-reporter:Jinchun Tu, Rui Wang, Wangchang Geng, Xiaoyong Lai, Tong Zhang, Nan Li, Nailin Yue, Xiaotian Li
Sensors and Actuators B: Chemical 2009 Volume 136(Issue 2) pp:392-398
Publication Date(Web):2 March 2009
DOI:10.1016/j.snb.2008.12.006
Li-doped 3D periodic mesoporous silica SBA-16 has been successfully prepared and investigated as humidity sensor material. After doping of 10% (wt) lithium chloride, mesoporous silica SBA-16 showed significant change in impedance of more than three orders of magnitude over almost the whole humidity range (11–95%RH), with fast response time (about 25 s), and relatively low hysteresis (about 4%). The comprehensive affections of the 3D mesoporous structure, highly dispersed uniform morphology, hydrophilic behavior of triblock copolymer surfactant F108, and the doped Li+ maybe make a great contribution to the improvement in the humidity sensitive property. A possible mechanism was also provided to explain the humidity sensitive properties.
Co-reporter:Xiaoyong Lai, Hong Wang, Dan Mao, Nailiang Yang, Jianxi Yao, Chaojian Xing, Dan Wang, Xiaotian Li
Materials Letters 2008 Volume 62(Issue 23) pp:3868-3871
Publication Date(Web):31 August 2008
DOI:10.1016/j.matlet.2008.05.007
The synthesis of crystalline mesoporous indium oxide by using a mesoporous carbon (CMK-3) as hard template is described. Transmission electron microscopy (TEM) exhibits the presence of mesoporous structure in our sample and the corresponding wide-angle X-ray diffraction (XRD) pattern confirmed the crystalline wall of sample. N2 adsorption measurement exhibits the synthesized crystalline mesoporous indium oxide possesses a specific surface area of 39 m2/g and the total pore volume of 0.17 cm3/g, and the corresponding pore size distribution curve reveals the presence of a mesopore of 7.0 nm in maximum. Our work demonstrates that the maintenance of the ordered structure of carbon template is very significant for obtaining high quality replicas via the nanocasting route.
Co-reporter:Hong WANG, Xiao-yong LAI, Wei XIA, Ran-bo YU, Dan MAO, Chao-jian XING, Jian-xi YAO, Dan WANG, Xiao-tian LI
Chemical Research in Chinese Universities 2008 Volume 24(Issue 3) pp:383-384
Publication Date(Web):May 2008
DOI:10.1016/S1005-9040(08)60080-X
Co-reporter:Mina Guli, Yue Chen, Xiaotian Li, Guangshan Zhu, Shilun Qiu
Journal of Luminescence 2007 Volume 126(Issue 2) pp:723-727
Publication Date(Web):October 2007
DOI:10.1016/j.jlumin.2006.11.003
Rhodamine B (Rh B) has been grafted into the channels of rod-like mesoporous silica SBA-15, which had been modified by organic silane with terminal amino group in CHCl3 solvent. The investigations of UV–vis, photoluminescence, and FT-IR confirmed the existence of Rh B in the channels of RSBA-15 (rod-like SBA-15). The composites show strong fluorescence and obvious blue-shift at the yellow wave band compared with Rh B in CHCl3.
Co-reporter:Xiaoyong Lai ;Wangchang Geng;Jinchun Tu;Jixue Li ;Shilun Qiu
Angewandte Chemie 2007 Volume 119(Issue 5) pp:
Publication Date(Web):5 DEC 2006
DOI:10.1002/ange.200603210
Alles in Ordnung! Mesoporöses Kupferoxid wurde erstmals durch eine doppelte Replikation aus dem geordneten mesoporösen Siliciumoxid SBA-15 über ein geordnetes mesoporöses Kohlenstoff-CMK-3-Intermediat synthetisiert (siehe Bild). Dieses Material könnte interessante Eigenschaften in der Katalyse oder in Lithiumionenbatterien zeigen.
Co-reporter:Xiaoyong Lai ;Wangchang Geng;Jinchun Tu;Jixue Li ;Shilun Qiu
Angewandte Chemie International Edition 2007 Volume 46(Issue 5) pp:
Publication Date(Web):5 DEC 2006
DOI:10.1002/anie.200603210
Order, order: Mesoporous copper oxide was synthesized for the first time by double replication from ordered mesoporous silica SBA-15 via the ordered mesoporous carbon intermediate CMK-3 (see picture). The new material has potentially exciting applications in catalysis or lithium-ion batteries.
Co-reporter:Song Wan, Jiabo Hu, Guo-Dong Li, Lan Yang, Yipu Liu, Ruiqin Gao, Xiaotian Li, Xiaoxin Zou
Journal of Alloys and Compounds (25 April 2017) Volume 702() pp:
Publication Date(Web):25 April 2017
DOI:10.1016/j.jallcom.2017.01.207
•CoSe2 nanoparticles on the three-dimensional nano-netlike carbon fibers (CoSe2-CFN) were prepared.•The obtained CoSe2 nanoparticles are highly dispersed on carbon fibers.•CoSe2-CFN exhibits high HER catalytic activity even at a low loading amount of catalytic species CoSe2.•Highly dispersed CoSe2 nanoparticles provide more active sites.More active sites and high conductivity are two effective ways to improve the activity of non-noble metal electrocatalysts. Herein, we present a facile electrostatic spinning technique to synthesize highly dispersed CoSe2 nanoparticles on three-dimensional nano-netlike carbon fibers through simple thermal treatment of polyacrylonitrile fibers containing Co ions (Co2+-PANF) and subsequent in-situ selenization. Moreover, we show that the resulting material (denoted as CoSe2-CFN) can serve as highly active, efficient and stable non-precious metal electrocatalyst for HER in acidic media. This material achieves a current density of 10 mA/cm2 at an overpotential of 133 mV with a loading amount of the active material CoSe2 about 0.128 mg/cm2, which is lower than that of the reported CoSe2-based materials. Meanwhile, CoSe2-CFN exhibits excellent catalytic stability for at least 20 h and gives nearly 100% Faradaic yield. The excellent hydrogen evolution reaction performance is due to the highly dispersed CoSe2 nanoparticles providing more active sites as well as the high electrical conductivity of the carbon fibers.
Co-reporter:Dahu baiyila, Xiaohui Wang, Xin Li, Bao sharileaodu, Xiaotian Li, Liang Xu, Zongrui Liu, Limei Duan and Jinghai Liu
Journal of Materials Chemistry A 2014 - vol. 2(Issue 31) pp:NaN12310-12310
Publication Date(Web):2014/06/02
DOI:10.1039/C4TA02224F
TiO2 nanofibers integrating space-separated magnetic nanoparticles and heterostructures have been fabricated to construct multifunctional photocatalysts with excellent photocatalytic activity and magnetic recoverability. The electrospinning technique has been employed to prepare the Fe3O4-embedded TiO2 (Fe3O4@TiO2) magnetic nanofibers. TiO2/CdS heterostructures (Fe3O4@TiO2/CdS) formed by depositing CdS nanoparticles onto the Fe3O4@TiO2 nanofibers have been obtained by a hydrothermal process. The heterostructures improve the photocatalytic activity and widen the range of solar light response. Under visible light irradiation, the photocatalytic activity of the Fe3O4@TiO2/CdS nanofibers is 5.11 times higher than that of the Fe3O4@TiO2 nanofibers and is 1.22 times than that of CdS nanoparticles. In addition, it exhibits a slight increase under simulated solar light with the photocatalytic degradation ratio 1.1 times higher than that under visible light. The loading amounts of CdS only have effects on the photocatalytic activity under visible light and simulated solar light. The Fe3O4@TiO2/CdS nanofiber exhibits a saturation magnetization strength of 1.572 emu g−1 and can be effortlessly separated and recovered by applying a contactless magnetic field. The cycling stability is durable after magnetic separation and recycling.
Co-reporter:Yue Chi, Liang Zhao, Qing Yuan, Xiao Yan, Yanjuan Li, Nan Li and Xiaotian Li
Journal of Materials Chemistry A 2012 - vol. 22(Issue 27) pp:NaN13577-13577
Publication Date(Web):2012/05/16
DOI:10.1039/C2JM31854G
The precise control of the surface chemistry, assembly processing, and size of each component is crucial to the construction of integrated functional nanocomposites. This article develops a novel in situ auto-reduction route, by which well dispersed silver nanoparticles can be easily fabricated in ordered mesoporous carbon. The mesoporous carbon functionalized with carboxylate groups was used to anchor glycol to form a novel reducing species (COOCH2CH2OH), on which Ag(NH3)2NO3 could be reduced in situ. Highly dispersed and small-sized Ag nanoparticles were thus obtained. The well designed composite has large surface area (836 m2 g−1), highly open mesopores (∼4.2 nm), and stably confined but accessible Ag nanoparticles and, as a result, shows a high performance in the catalytic reduction of 4-nitrophenol (4-NP).
