APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Zhiwang Yang,Xueqing Xu,Xixi Liang,Cheng Lei,Yuli Wei,Peiqi He,Bolin Lv,Hengchang Ma,Ziqiang Lei
A series of MIL-53(Fe)-graphene nanocomposite photocatalysts were synthesized by a facile one-pot solvothermal reaction. All materials have been thoroughly characterized by FT-IR, SEM, TEM, PXRD, UV–vis DRS and PL analysis. It was demonstrated that the introducing of graphene on the MIL-53(Fe) would minimize the recombination of photogenerated electron-hole pairs, thus, leading to the enhancement of photocatalytic activity. MIL-53(Fe)-graphene nanocomposite was an efficient catalyst towards the photocatalytic selectively oxidation of alcohols to the corresponding aldehydes or ketones under visible light and ambient conditions. High selectivity of the aldehydes or ketones (99%) were obtained. Meanwhile, the catalyst can be recycled at least four times without loss of catalytic efficiency. A possible photocatalytic reaction mechanism involving a direct photogenerated hole-oxidation process was also investigated in detail by the active species trapping experiments and the related electrochemical analysis.
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Nanoscale
·
2017
·Vol. 9
·期 45
·17849-17858
·
IF 7.367
Yijun Zhang,Rongrong Yuan,Meiling He,Guangcai Hu,Jutao Jiang,Tao Xu,Lei Zhou,Wei Chen,Weidong Xiang,Xiaojuan Liang
The first use of the combination of ammonium citrate (AC) and ethylenediamine tetraacetic acid (EDTA) as coordinating precursors for the synthesis of highly fluorescent (quantum yield = 67%) multicolour nitrogen-doped carbon dots (CDs) is reported. Under UV light, these CDs emitted outstanding luminescence in colours from dark blue to red. Interestingly, a single component white-light CD point with high fluorescence efficiency was obtained by surface control. Alterations of the photoluminescence (PL) emission of these full-colour CDs were tentatively proposed to benefit from surface functional groups, such as CO and CN. An energy-level model was proposed to explain the continuously adjustable full-colour emission. The white light may be attributed to the overlap of diverse light emission induced by electron transitions between the energy levels. Subsequently, to avoid aggregation-induced solid-state fluorescence quenching, multicolour CD-based sandwich glasses with various colour emission was fabricated, which is anticipated to be compatible with the all-optical light-emitting diodes (LEDs). The facile preparation and outstanding optical features are believed to provide an alternative synthesis route and inspire more research into applications and CD-based materials of multicolour CDs.
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POWDER TECHNOLOGY
·
2017
·
IF 2.942
Ziling Peng,Dan Wu,Wei Wang,Fatang Tan,Xinyun Wang,Jianguo Chen,Xueliang Qiao
Among metal oxide photocatalysts , zinc oxide (ZnO) has attracted extensive attention due to its advantages of low toxicity and relatively low cost of production. In this work, ZnO nanopowders doped with different metal ions (Li + , Mg 2+ , Al 3+ and Ti 4+ ) were synthesized by a sol-gel method. Multiple techniques such as X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffused reflectance spectra (UV-vis DRS), photoluminescence (PL) spectra and Brunauer-Emmett-Teller (BET) measurements were employed to study the structures, morphologies and physicochemical properties of the photocatalysts. The influence of metal ion doping on the photocatalytic activity of ZnO was assessed by inactivating a typical Gram-negative bacterium, Escherichia coli K-12 under visible-light irradiation. It was found that Al doping and Ti doping could promote the photocatalytic bacterial inactivation activity of ZnO, while Li doping and Mg doping hindered the bacterial inactivation activity of ZnO photocatalysts. Moreover, Al-doped ZnO exhibited the best visible-light-driven (VLD) photocatalytic activity among these samples, with 7-log of E. coli K-12 cells being completely inactivated within 4 h. The large percentage of absorbed oxygen, narrow band gap and extended visible light absorption were considered to contribute to the powerful VLD photocatalytic activity of Al-doped ZnO.
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JOURNAL OF LUMINESCENCE
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2016
·
IF 2.693
Yanping Miao,Ping Yang,Katarzyna Matras-Postolek
Large flexible silica films encapsulating hydrophilic CdTe quantum dots (QDs) were fabricated via controlling the hydrolysis of 3-aminopropyltrimethoxysilane (APS). Hydrophilic CdTe quantum dots with green to red emitting were encapsulated in the films through a sol–gel incorporation process for retaining high photoluminescence (PL) efficiency and stability. Fluorescence microscopy and a scanning electron microscopy were employed to examine dispersion of CdTe QDs in the emitting films, which illustrated that structure of silica films was uniform. The PL stability of these flexible silica films was investigated in argon condition, the PL properties of the films encapsulated green-, yellow-, and red-emitting CdTe QDs were very stable. Furthermore, the silica-CdTe QDs emitting films revealed high PL stability under ultraviolet (UV) light irradiation , proper concentration of QDs in silica films can make the films more stable. In addition, different emission flexible silica-CdTe QDs films with large area were obtained. The dual-emitting silica-CdTe QDs films exhibited coordinates (0.384, 0.350) in the Commission Internationale de I׳Eclairage (CIE) chromaticity diagram under blue light as excitation source. Due to flexibility, adjustable colors, high stability, large area, easy to operate, silica-CdTe QDs emitting films show potential application in lighting devices and flat panel displays .
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NANO
·
2016
·
IF 0.951
Wei Li,Gang Ni,Jing Li,Ying Han
BiOI/HZSM-5 composites were synthesized via a facile and environmentally-benign hydrothermal method. The crystalline structures and morphologies of the powder have been characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic activity of samples was tested for degradation of methylene blue (MB) and Rhodamine B (RhB) dye under simulated solar light irradiation. The degradation rate of MB and RhB by BiOI/HZSM-5 composite photocatalysts respective reach 99.6% and 98.6% under visible light irradiation, BiOI/HZSM-5 exhibited the highest photocatalytic performance when compared with pure BiOI.
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ELECTROCHEMISTRY COMMUNICATIONS
·
2016
·
IF 4.569
Hua-Bin Fang,Nan Li,Zhibing Xue,Yikun Zhang,Yan-Zhen Zheng,Xia Tao
Tungsten disulfide (WS 2 ) has recently emerged as a narrow-band visible-light-driven photocatalyst; however, high recombination of photo-induced electrons and holes becomes a major concern to advance its photocatalytic performance. Here we for the first time adopt manganese oxide (MnO x ) as a hole-trapping material to decorate WS 2 nanosheets by photo-deposition in MnSO 4 solution. The MnO x decorated WS 2 (MnO x /WS 2 ) is found to exhibit more negative flat band potential, lower impedance and higher photocurrent response compared with pure WS 2 . These features beneficial to charge transfer and separation render the MnO x /WS 2 nanosheets highly active and visible-light-driven photocatalyst in RhB degradation. Further, the hole-trapping function of MnO x in promoting efficient charge separation of MnO x /WS 2 is experimentally demonstrated.
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THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Bin Xu,Boyi Wang,Caixia Zhang,Jing Zhou
In this study, we adopted the organic precursor thermal decomposition method to prepare Cu 2 O-Cu-MWCNTs/paraffin light-thermal conversion phase change material via one-step. The phase, micro morphology, phase change behavior, thermal reliability and thermal stability of the products were respectively characterized by XRD, SEM, DSC and TGA. We also investigated their light-thermal conversion properties. The results indicated when the content of precursor was 0.005 mol and 0.01 mol, the average particles size of hybird particles (Cu and Cu 2 O) were 30 nm and 400 nm, respectively. It was also found that the light-heat conversion performance of Cu 2 O-Cu-MWCNTs/paraffin were better than that of MWCNTs/paraffin with the same mass fraction. After we conducted analyses of UV–vis diffuse reflection spectra and thermal conductivity, We attributed the better light-heat conversion performance of Cu 2 O-Cu-MWCNTs/paraffin to the high light absorption ability of Cu 2 O and the reduction of interface thermal resistance between MWCNTs and paraffinresulting from Cu and Cu 2 O decorated MWCNTs.
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NANOTECHNOLOGY
·
2017
·Vol. 28
·期 49
·495710
·
IF 3.44
Ruiru Zhao,Jianping Gao,Shunkang Mei,Yongli Wu,Xiaoxue Wang,Xiangang Zhai,Jiangbing Yang,Chaoyue Hao,Jing Yan
A simple and convenient method was used to synthesize a graphitic carbon nitride (g-C3N4) nanoporous-tube by using SiO2 nanoparticles as pore formers. The structure of the g-C3N4 nanoporous-tube was characterized by the SEM and TEM images. Taking photodegradation of RhB as an example, the photocatalytic activity of the as-prepared g-C3N4 nanoporous-tube was investigated. It can photodegrade 90% RhB in 40 min under visible-light irradiation and obtain a k value of 0.04491 min−1, which is 8.16 times that of bulk g-C3N4, 3.09 times that of tubular g-C3N4 and 1.48 times that of tubular g-C3N4-SiO2. The significant enhancement in photocatalytic efficiency is due to the edge effect of the pores and the special structure of the tubes. In addition, the possible mechanism of photocatalytic degradation of RhB was also proposed based on the trapping experiment of active species, which indicated that the superoxide radicals (O2∙−) and the holes (h+) were the main reactive species in this photocatalyst. This work may open up a new idea of innovation in g-C3N4 structure and inspire its follow-up study.
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RSC Advances
·
2017
·Vol. 7
·期 71
·44688-44695
·
IF 3.108
Zhiyong Li,Huiyong Wang,Mengen Chu,Pengxin Guan,Yang Zhao,Yuling Zhao,Jianji Wang
Light modulation of the isomerization and aggregation behavior of ionic liquids in aqueous solution is of great importance from a fundamental and technical point of view. In this work, 4 kinds of azobenzene-based photoresponsive ionic liquids 2-hydroxyethyl-dimethyl-[10-(4-phenylazo-phenoxy)-decyl]-ammonium bromide (ChoC10Azo), 2-hydroxyethyl-dimethyl-[6-(4-phenylazo-phenoxy)-hexyl]-ammonium bromide (ChoC6Azo), 2-hydroxyethyl-dimethyl-[4-(4-phenylazo-phenoxy)-butyl]-ammonium bromide (ChoC4Azo) and 2-hydroxyethyl-dimethyl-[2-(4-phenylazo-phenoxy)-ethyl]-ammonium bromide (ChoC2Azo) were designed, synthesized and characterized. The photo-isomerization and light modulation of the aggregation behavior of these ionic liquids were investigated in water using UV-vis spectroscopy, conductivity, dynamic light scattering and small-angle X-ray scattering measurements. The results showed that these ionic liquids had rapid photo-responsive performance, and their photoisomerization efficiencies were greater than 83% after 5 s of UV irradiation. The equilibrium time of the isomerization reaction was about 30 s for ChoC6Azo, ChoC4Azo and ChoC2Azo, and about 10 min for ChoC10Azo. However, there was no significant difference between the equilibrium isomerization efficiencies of these materials. In addition, only ChoC10Azo could form micelles in water among the studied ionic liquids, UV/visible light irradiation only changed the size of its aggregates, but could not change its structure. The results have been used to understand the effect of azobenzene group position and alkyl chain length in the ionic liquids on the photoisomerization and self-assembly of the azobenzene-based ionic liquids in aqueous solutions.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Bo Wang,Wenhui Feng,Lulu Zhang,Yan Zhang,Xueyan Huang,Zhibin Fang,Ping Liu
A novel Bi/CdS nanocomposite is obtained via an in-situ chemical reduction method under mild conditions. The incorporation of Bi nanostructure can significantly enhance the photocatalytic performance for methyl orange (MO) and salicylic acid (SA) degradation compared with pristine CdS under visible light irradiation. The dramatically improved photoactivity can be attributed to the enhanced light absorption and optimized charge separation. In addition, the photocatalysis mechanism upon Bi/CdS for MO degradation is also investigated. This study is hoped to provide a new inspiration for the construction of high-efficiency semimetal/semiconductor photocatalysts, especially for non-noble metal/M x S y nanocomposites.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Liu Renlan,Zhu Xiaoying,Chen Baoliang
Graphene oxide (GO) contains not only aromatic carbon lattice but also carboxyl groups which enhanced the aqueous solubility of GO. To study the transformation of GO nanosheets in natural environments, GO aqueous dispersion was mixed with Fe 3+ ions to form photoactive complex. Under visible light irradiation, Fe(III) of the complex would be reduced to Fe(II) which could subsequently reduce highly toxic Cr(VI) to Cr 3+ . The electron of the reduction was contributed by the decarboxylation of carboxyl groups on GO and iron was acting as a catalyst during the photoreduction. On the other hand, the consumption of carboxyl groups may convert GO to rGO which are tend to aggregate since the decreased electrostatic repulsion and the increased π-π attraction. The formed Cr 3+ may be electrostatically adsorbed by the rGO sheets and simultaneously precipitated with the aggregated rGO sheets, resulting the effective removal of chromium and GO nanosheets from the aqueous environment. This study may shed a light on understanding the environmental transformation of GO and guide the treatment of Cr(VI).
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WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
·
2017
·Vol. 33
·期 2
·1-14
·
IF 1.658
Guan Jian,Shen Songdong,Wu Hao,Liu Xin,Shen Weijie,He Yuan,Duan R.
The filamentous Cyanobacterium Arthrospira is commercially produced and is a functional, high-value, health food. We identified 5 low temperature and low light intensity tolerant strains of Arthrospira sp. (GMPA1, GMPA7, GMPB1, GMPC1, and GMPC3) using ethyl methanesulfonate mutagenesis and low temperature screening. The 5 Arthrospira strains grew rapidly below 14 °C, 43.75 μmol photons m −2 s −1 and performed breed conservation at 2.5 °C, 8.75 μmol photons m −2 s −1 . We used morphological identification and molecular genetic analysis to identify GMPA1, GMPA7, GMPB1 and GMPC1 as Arthrospira platensis , while GMPC3 was identified as Arthrospira maxima . Growth at different culture temperatures was determined at regular intervals using dry biomass. At 16 °C and 43.75 μmol photons m −2 s −1 , the maximum dry biomass production and the mean dry biomass productivity of GMPA1, GMPB1, and GMPC1 were 2057 ± 80 mg l −1 , 68.7 ± 2.5 mg l −1 day −1 , 1839 ± 44 mg l −1 , 60.6 ± 1.8 mg l −1 day −1 , and 2113 ± 64 mg l −1 , 77.7 ± 2.5 mg l −1 day −1 respectively. GMPB1 was chosen for additional low temperature tolerance studies and growth temperature preference. In winter, GMPB1 grew well at mean temperatures <10 °C, achieving 3258 mg dry biomass from a starting 68 mg. In summer, GMPB1 grew rapidly at mean temperatures more than 28 °C, achieving 1140 mg l −1 dry biomass from a starting 240 mg. Phytonutrient analysis of GMPB1 showed high levels of C-phycocyanin and carotenoids. Arthrospira metabolism relates to terpenoids, and the methyl- d -erythritol 4-phosphate pathway is the only terpenoid biosynthetic pathway in Cyanobacteria. The 1-deoxy- d -xylulose 5-phosphate reductoisomerase (DXR) gene from GMPB1 was cloned and phylogenetic analysis showed that GMPB1 is closest to the Cyanobacterium Oscillatoria nigro-viridis PCC711. Low temperature tolerant Arthrospira strains could broaden the areas suitable for cultivation, extend the seasonal cultivation time, and lower production costs.
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