CHINESE JOURNAL OF CATALYSIS
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2018
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IF 3.525
Hongju Han,Min Fu,Yalin Li,Wei Guan,Peng Lu,Xueli Hu
Polypyrrole-modified graphitic carbon nitride composites (PPy/g-C 3 N 4 ) are fabricated using an in-situ polymerization method to improve the visible light photocatalytic activity of g-C 3 N 4 . The PPy/g-C 3 N 4 is applied to the photocatalytic degradation of methylene blue (MB) under visible light irradiation. Various characterization techniques are employed to investigate the relationship between the structural properties and photoactivities of the as-prepared composites. Results show that the specific surface area of the PPy/g-C 3 N 4 composites increases upon assembly of the amorphous PPy nanoparticles on the g-C 3 N 4 surface. Owing to the strong conductivity, the PPy can be used as a transition channel for electrons to move onto the g-C 3 N 4 surface, thus inhibiting the recombination of photogenerated carriers of g-C 3 N 4 and improving the photocatalytic performance. The elevated light adsorption of PPy/g-C 3 N 4 composites is attributed to the strong absorption coefficient of PPy. The composite containing 0.75 wt% PPy exhibits a photocatalytic efficiency that is 3 times higher than that of g-C 3 N 4 in 2 h. Moreover, the degradation kinetics follow a pseudo-first-order model. A detailed photocatalytic mechanism is proposed with · OH and · O 2 − radicals as the main reactive species. The present work provides new insights into the mechanistic understanding of PPy in PPy/g-C 3 N 4 composites for environmental applications.
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APPLIED SURFACE SCIENCE
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2018
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IF 4.439
Wenqi Li,Xingeng Ding,Huating Wu,Hui Yang
Semiconductor photocatalysis is an effective green way to combat water pollution. For the first time, this study reports a novel method to develop Bi 2 Mo x W 1- x O 6 solid solution with microsphere structure through anion-exchange method. All Bi 2 Mo x W 1- x O 6 samples exhibit an Aurivillius-type crystal structure without any secondary phase, confirming that in complete solid solutions as the value of x increases, the band gap energy of Bi 2 Mo x W 1- x O 6 solid solutions decreases, while the optical absorption edge moves to longer wavelength. The Raman spectra research shows an increase in orthorhombic distortion with progressive replacement of W sites in Bi 2 WO 6 with Mo 6+ ions. Compared to Bi 2 MoO 6 and Bi 2 WO 6 samples, Bi 2 Mo 0.4 W 0.6 O 6 sample displayed best photocatalytic activity and cycling stability for degradation of RhB dye. The enhanced photocatalytic activity of Bi 2 Mo 0.4 W 0.6 O 6 sample can be synergetically linked to hierarchical hollow structure, enhanced light absorbance, and high carrier-separation efficiency. Additionally, the hollow Bi 2 Mo x W 1- x O 6 microspheres formation can be attributed to the Kirkendall effect.
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ACS Applied Materials & Interfaces
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2018
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IF 8.097
Tianyi Zhang,Feifei Zhao,Li Li,Bin Qi,Dongxia Zhu,Jianhua Lü,Changli Lü
The past few years have witnessed the rapid development of carbon dots (CDs) due to their outstanding optical properties and a wide range of applications. However, the design and control of CDs with long-wavelength multicolor emission are still huge challenges to be addressed for their practical use in different fields. Here, novel nitrogen-doped multiple-core@shell-structured AC-CDs with tricolor emissions of red, green, and blue were constructed via one-pot hydrothermal method from 5-amino-1,10-phenanthroline and citric acid as reactants and the growth process of AC-CDs was monitored with the reaction time in the synthetic system. The origin of different fluorescence emissions was explored using the unique coordination ability of the surface groups of AC-CDs. An obvious concentration dependence of fluorescent properties was observed for the as-prepared AC-CDs, and a highly fluorescent quantum yield (QY) of 67% for red emission at 630 nm can be obtained by adjusting concentration of AC-CDs. The pure white-light emission (0.33, 0.33; Commission Internationale de l’Elcairage coordinate) was carried out from single carbon dot with QY of 29% through regulation of the excitation and concentration of multiple-core@shell-structured AC-CDs. In addition, because of their excellent photoluminescent properties, the white-emitting AC-CDs as emitting phosphor can be easily used in the fabrication of white-light-emitting diode with good anti-photobleaching and temperature stability.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2018
·Vol. 29
·期 8
·2245-2252
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IF 2.137
Lin Tong,Yakai Feng,Xujun Sun,Ying Han,Dongshun Jiao,Xiaohua Tan
The encapsulation of high power light emitting diode (LED) needs the silicone resins to have relative high refractive index and thermal-aging properties. Herein, high refractive index adamantane-based phenyl epoxy-silicone (APES) resins for LED encapsulation were synthesized by the sol-gel condensation of 1-adamantane methanol propyltrimethoxysilane-3-urethane, γ-(2,3-epoxypropoxy)propytrimethoxysilane and diphenylsilanediol. These adamantane-based silicone resins have multifunctional groups including adamantyl group, phenyl group, and epoxy group in order to meet the various requirements for LED encapsulation. Importantly, the adamantane group in the silicone resins benefits for high refractive index and anti-thermal properties. These APES resins were characterized by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy. When APES resins were cured by methylhexahydrophthalic anhydride, they showed relatively high refractive index of 1.56, high hardness, and high thermal resistance. The encapsulated LED demonstrated high adhesion properties by red-ink tests. These merits make adamantane-based silicone resins promising candidates as LED encapsulation materials.
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Journal of Inorganic and Organometallic Polymers and Materials
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2018
·Vol. 28
·期 6
·2701-2713
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IF 1.754
Wu Gang,Guo Shuang,Yin Yue,Sun Gang,Zhong Yongjian,You Bo
This paper presented a facile method to prepare the silica/poly (methyl methacrylate) (SiO 2 /PMMA) nanocomposite hollow microspheres (NHSs) which were firstly applied to fabricate the light diffusion films with high transmittance and high haze simultaneously. The SiO 2 /PMMA NHSs were prepared via in situ diffusion of polymeric core into the voids of inorganic shell under strong electrostatic attraction. The hollow morphologies of the microspheres were studied under the help of transmission electron microscope and scanning electronic microscope. The formation process of these NHSs could be elucidated using a mechanism similar to the Kirkendall effect. These NHSs were firstly used to produce light diffusion films by blending with polyacrylate latex. The new kind of light diffusion films with micro-nano structure were built by casting the SiO 2 /PMMA NHSs/polyacrylate coatings on optical-grade PET films. The transmittance and haze value of the light diffusion films were tested by a haze meter and application on a LED lamp. As a result, the coating films with NHSs had the best light diffusion properties compared to those films with no spheres or nanocomposite solid microspheres, which indicated that the light diffusion films with NHSs were promisingly applied in LED illumination, photoelectric devices and large area LCD.
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HIGH PERFORMANCE POLYMERS
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2018
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IF 1.047
Lei Wang,Guifen Gong,Junyao Shen,Jinsong Leng
Polyimide (PI)/titanium dioxide (TiO2) composite nanofibers (NFs) with average diameters of 200–250 nm were synthesized via electrospinning. The total number density of dipoles decreased significantly, owing to the porous structures and compact interface between TiO2 NPs and PI matrix. All PI/TiO2 NFs maintain low dielectric constants and losses. For example, the dielectric constants of PI/TiO2-6% NFs are all lower than 2.6, being exposed to temperatures from 25°C to 200°C. Meantime, the dielectric losses of PI/TiO2-6% NFs are below 0.005. For ultraviolet (UV)-light shielding performance, the PI/TiO2 NFs exhibited good UV-light shielding and corresponding anti-photoaging properties. The reason can be ascribed from high UV-light absorption and scattering ability in the TiO2 NPs. The best UV-light absorption (average: 3.71) and corresponding absorption decay (15.13%) were achieved for optimized PI/TiO2-6% NFs. Other fundamental characteristics, such as the thermal stability, mechanical tensile property, and hydrophobicity, were also investigated. Such low dielectric constant PI/TiO2 composite NFs can be alternatively chosen under a longtime UV-light exposing condition.
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MATERIALS RESEARCH BULLETIN
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2018
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IF 2.873
Feng Hou,Yong Li,Yanting Gao,Shan Hu,Baogang Wu,Hongliang Bao,Hong Wang,Baojiang Jiang
Non-metallic boron modified graphitic carbon nitrogen (BCN) tube was prepared by a simple hydrothermal method using melamine as initial material and boric acid as boron source. Through thermal treatment, boron was directly introduced into g-C 3 N 4 tube structure. Boron modified could increase the specific surface area of g-C 3 N 4 and enhance its visible-light responsiveness. Importantly, the separation of the photogenerated electrons and holes in BCN tube was significantly enhanced, which can contribute to the improvement of photocatalytic activity. The photocatalytic activity of BCN tube was evaluated by degrading Rhodamine B (RhB) and Methylene blue (MB) experiments under visible light irradiation. The prepared BCN-3 sample (B: 0.36 mol %) showed the best photocatalytic activity when the initial material molar ratio of melamine to boric acid was 1:1. The degradation rate of BCN-3 to RhB was 99.3% under visible light irradiation for 90 min. The catalyst also showed good degradation effect for MB.
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2018
·Vol. 56
·期 18
·2072-2079
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IF 2.588
Qian Yang,Xianhong Zhang,Yuhong Ma,Dong Chen,Wantai Yang
A photoinduced electron transfer-reversible addition-fragmentation chain transfer (PET-RAFT) polymerization of p -methylstyrene ( p -MS) and styrene (St) with 2-(dodecylthiocarbonothioylthio)-2-methylpropionic acid as the chain transfer agent (CTA) and aromatic aldehydes, including 4-cyanobenzaldehyde (PC1), 2,4-dimethoxy benzaldehyde, and 4-methoxy benzaldehyde, as organic photocatalysts has been demonstrated via irradiation with 23 W compact fluorescent lamps. The kinetics of the polymerizations shows first order with respect to monomer conversions. Linear evolution of the M n of the produced polymers with the monomer conversion is observed. Meanwhile, the as-prepared polymers are of relatively narrow polydispersity (PDI = M w / M n ). For instance, the polymerization of p -MS shows living polymerization features using PC1 within a range of solvents. Especially, the M n of P p MS increased from about 2100 to 12,700 g/mol with the monomer conversion from 8% to 52% in tetrahydrofuran. The controlled polymerization of St is also observed under optimal reaction conditions. However, the M n discrepancy between the experimental readings and theoretical calculations is greater at the monomer conversions greater than 40% and the PDI increased gradually over the monomer conversion. This is probably because that CTA is strongly sensitive to the light irradiation with wave range around its characteristic absorption wavelength, leading to significant decomposition of CTA moieties during the RAFT polymerization. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56 , 2072–2079
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Analytical Methods
·
2018
·Vol. 10
·期 42
·5112-5117
·
IF 2.073
Yanru Qin,Jingfan Xie,Shuting Li,Changqun Cai,Xiaoming Chen,Guanqun Zhong,Chunyan Chen
Glycoproteins have extraordinary significance for the diagnosis of tumors and cancers. However, in untreated complex biological samples, highly selective and sensitive determination of glycoproteins is still a huge challenge. In this study, a boronate affinity surface molecularly imprinted resonance light scattering (RLS) sensor was constructed to detect glycoproteins. In the RLS sensor, 4-vinylbenzeneboronic acid, which was used as a functional monomer for molecularly imprinted polymers (MIPs), is pH sensitive and can reversibly bind to glycoproteins. In addition, 2-(dimethylamino) ethyl methacrylate was also applied as a pH-responsive component to prepare MIPs. The swelling/shrinking properties of the resultant MIPs are beneficial to rapidly remove template glycoproteins from MIPs. Combining the boronate affinity and MIPs, the RLS sensor can specifically recognize target glycoproteins from sample solutions and sensitively detect them. Under optimum conditions, the RLS sensor has a linear response to ovalbumin (OVA) in the range of 0.5–15 nM with a low detection limit of 0.13 nM. The RLS sensor has been successfully utilized for the detection of OVA in real human blood serum, with a good recovery of 94.0–104%. This approach will provide a promising way to detect glycoproteins in clinical diagnostics.
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SOLAR ENERGY
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2018
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IF 4.374
Xinzhi Wang,Yurong He,Yanwei Hu,Guangri Jin,Baocheng Jiang,Yimin Huang
Photocatalytic semiconductors have attracted much attention due to their effective harvesting of solar energy for chemical synthesis and wastewater treatment. In particular, 3D hierarchical CuS materials exhibit unique photocatalytic performance due to their distinctive optical properties and high specific surface areas. In the present work, a facile and template-free solvothermal method was applied to the synthesis of monodispersed and homogeneous 3D flower-like CuS superparticles. The prepared superparticles exhibit good photocatalytic properties for degrading organic pollutants (methylene blue) in water. Furthermore, the effect of photothermal conversion in enhancing the photocatalytic activity of this flower-like material was studied; this effect has not been considered in most of the previous work. The photodegradation rate was enhanced by ∼212.7% in the photothermal-assisted system. This result reveals that photothermal conversion in CuS particles plays an important role in engendering highly efficient photocatalytic activity and the efficient utilization of solar energy.
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ACS Omega
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2018
·
IF 0
Luhong Zhang,Zhengyuan Jin,Hao Lu,Tianquan Lin,Shuangchen Ruan,Xiu Song Zhao,Yu-Jia Zeng
Hydrogen production by water splitting and the removal of aqueous dyes by using a catalyst and solar energy are an ideal future energy source and useful for environmental protection. Graphitic carbon nitride can be used as the photocatalyst with visible light irradiation. However, it typically suffers from the high recombination of carriers and low electrical conductivity. Here, we have developed a facile mix-thermal strategy to prepare carbon black-modified graphitic carbon nitrides, which possess high electrical conductivity, a wide adsorption range of visible light, and a low recombination rate of carriers. With the help of carbon black, highly crystallized graphitic carbon nitrides with built-in triazine and heptazine heterojunctions are obtained. Improved photocatalytic activities have been achieved in carbon black-modified graphitic carbon nitride. The dye removal rate can be three times faster than that of pristine graphitic carbon nitride and the photocatalytic H2 generation is 234 μmol h–1 g–1 under visible light irradiation.
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PubMed
SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Chuanmin Ding,Xue Wang,Kaijing Song,Bing Zhang,Junwen Wang,Zhihuan Zhao,Honghong Chang,Wenlong Wei
Herein visible light was utilized as activator to enable colorimetric immunoassay to detect tumor marker based on ternary GO-C 3 N 4 -AgBr heterojunction nanophotocatalyst. Firstly, synthesized photocatalyst GO-C 3 N 4 -AgBr could oxidize TMB due to photogenerated hole and the oxidation ability was enhanced due to ternary heterojunction structure. Secondly, depending on the specific binding of antigen and antibody, the sandwich-type immunocomplex were constructed on the platform of magnetic bead with advantages of convenient cleaning and easy separation. Finally, TMB was added into the ABS buffer solution of immunocomplex. Under visible light radiation, fast change in color was observed within 10 s. Under optimal conditions, there was a linear relation between absorbance and target protein concentration in the range of 0.5 ng mL −1 –25 ng mL −1 with the detection limit of 20 pg mL −1 . Meanwhile, the developed colorimetric immunoassay displayed preferable selectivity, repeatability, and stability.
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