ENERGY
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2019
·
IF 5.537
Liang Jiang,Yuan Lei,Qinfeng Liu,Jingxin Lei
Except for the improvement enthalpy value and thermal conductivity of conventional solid-solid phase change materials (SSPCMs), expansion of additional functions other than thermal energy storage function of that has been particularly attractive. In this work, a novel self-luminous SSPCMs based polyethylene glycol have been successfully synthesized via incorporation of long afterglow luminescence (LAL) particles into SSPCMs in the absence of any isocyanates and solvents. The prepared self-luminous SSPCMs have high melting latent heats with a maximum value at 120.2 J g −1 , maximum encapsulation ratio of 80.6%, and a suitable phase change temperature around 28 °C. Importantly, the prepared self-luminous SSPCMs with different concentrations of LAL particles can absorb and store visible light sources in the daylight but can slowly release blue light in the dark over a long time. Furthermore, the prepared self-luminous SSPCMs after thermal cycling tests and storing-releasing light energy cycling tests have preeminent thermal reliability, luminescence repeatability and chemical structure reliability for a long time practical application.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yawei Wang,Shunhang Wei,Xiaoxiang Xu
Solid solutions between SrTaO 2 N and CaTaO 2 N, i.e. Sr 1-x Ca x TaO 2 N (0.0 ≤ x ≤ 1.0) were synthesized and investigated as photocatalysts for water oxidation and reduction. A wealth of important parameters such as Ta-(O, N) bond length, Ta-(O, N)-Ta bond angle, band gap and band edge positions can be successively tuned by varying Sr/Ca molar ratios at A site. These solid solutions work well as photocatalysts to drive water splitting reactions under visible light illumination which clearly outperform their parent compounds SrTaO 2 N and CaTaO 2 N. Apparent quantum efficiency as high as 1.67% at 420 ± 20 nm was achieved on Sr 0.4 Ca 0.6 TaO 2 N (x = 0.6) which stands as the highest one reported for SrTaO 2 N and CaTaO 2 N to date. This simple approach by cation control at A site serves as a useful tool to tailor photocatalytic properties of perovskite oxynitrides, opening new playgrounds for the design and development of these tempting compounds as efficient photocatalysts.
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ACS Nano
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2019
·
IF 13.903
Jingwen Xu,Ning Liu,Di Wu,Zhida Gao,Yan-Yan Song,Patrik Schmuki
The low penetration depth of UV light in mammalian tissue is the critical limitation for the use of TiO2-based photocatalysis in biomedical applications. In this work, we develop an effective near-infrared (NIR)-active photocatalytic platform that consists of a shell structure of upconversion nanocrystals decorated on a core of Au/dark-TiO2. The heart of this system is the strong photocatalytic activity in the visible region enabled by the gold surface-plasmon resonance on dark TiO2 (D-TiO2). Simulation and experiment demonstrate for an optimized Au/D-TiO2 combination a highly enhanced light absorption in the visible range. Using ampicillin sodium (AMP) as model drug, we exemplify the effective use of this principle by demonstrating a NIR light-triggered photocatalytic payload release. Importantly, the photocatalytically generated reactive oxygen species can effectively inactivate AMP-resistant bacteria strains, thus maintaining an antibacterial effect even after all drug is released. Overall, we anticipate that the here-introduced NIR-light-active photocatalytic cascade can considerably widen TiO2-based photocatalysis and its applications into the infrared range.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Hongtao Wang,Jihao Bai,Meng Dai,Kunpeng Liu,Yueying Liu,Linsheng Zhou,Fengmin Liu,Fangmeng Liu,Yuan Gao,Xu Yan,Lu Geyu
In this work, 2D/2D ZnO/g-C 3 N 4 heterojunction composite was synthesized through an ultrasonic mixing and subsequent calcination process. The gas-sensing performance to NO 2 was investigated at room temperature activated by visible/ultra-violet LED light sources. Noticeably, when ZnO/g-C 3 N 4 composite is illuminated by 460 nm light, it exhibits the highest response of 44.8 to 7 ppm NO 2 , and the response and recovery time is 142 and 190 s, respectively. Furthermore, it possesses excellent repeatability and selectivity to NO 2 , and the limit of detection is 38 ppb. In addition, the effect of humidity on the sensing performance under visible light was also investigated. The excellent gas-sensing performance is attributed to the absorbance of g-C 3 N 4 in the visible light region and the charge separation at the interface between ZnO and g-C 3 N 4 .
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JOURNAL OF SOLID STATE CHEMISTRY
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2019
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IF 2.291
Jian Zhang,Lingnan Qu,Yuhang Wu,Yuxuan Ma,Zhanli Chai,Xiaojing Wang
We have prepared a superfine powder Bi 3 TaO 7 which was attached in worm-like Bi 2 O 3 to form a Bi 2 O 3 -Bi 3 TaO 7 composite by a simple facile calcination method. The as-obtained samples were measured by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectrum (EDX), Fourier transform infrared spectroscopy (FT-IR), UV–visible diffused reflectance spectrum (DRS) and X-ray photoelectron spectra (XPS). The optimal Bi 2 O 3 -Bi 3 TaO 7 (2.0Bi 2 O 3 :1.0Bi 3 TaO 7 ) sample show the highest photocatalytic efficiency for tetracycline (TC) degradation (90.06%) irradiated with visible light, compared with that of a bare Bi 3 TaO 7 catalyst. Meanwhile, radical capturing experiments indicate that the photo-induced holes (h + ) and hydroxyl radial (•OH) are the main active species. Through the measurement of photocurrent density and electrochemical impedance spectrum, it indicates that the photogenerated carriers are significantly separated due to the formation of heterojunctions . Consequently, the Bi 2 O 3 -Bi 3 TaO 7 photocatalyst may have potential applications in environmental purification.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 33
·10281-10288
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IF 6.641
Mingguang Li,Jun Wang,Ying Zhang,Yizhong Dai,Lingfeng Chen,Chao Zheng,Wenzhen Lv,Runfeng Chen,Wei Huang
Control of interfacial layers is highly effective in tuning charge injection and transport processes in various organic optoelectronic architectures for high device performance. Herein, we developed a thermal imprinting and vapor annealing (TIVA) method to regulate the microstructures of the widely used poly(3,4-ethylenedioxythiophene):polystyrenesulfonic acid (PEDOT:PSS) interfacial layer. The introduced ammonia vapor can reduce the acidity of the PSS units and facilitate the formation of continuous hole-transport channels. Meanwhile, the sub-micron patterns can be efficiently transferred from the flexible template to the PEDOT:PSS layer via thermal imprinting (TI) treatment. Interestingly, the synergistic effects on the PEDOT:PSS hole-injection layer (HIL) result in a current efficiency (CE) of 36.62 cd A−1, power efficiency (PE) of 27.60 lm W−1 and external quantum efficiency (EQE) of 18.80% with a more than 35% efficiency enhancement for the blue phosphorescent organic light emitting diodes (PhOLEDs). This novel TIVA method applied to the regulation of a PEDOT:PSS HIL benefits the performance of PhOLEDs in two ways: (1) to regulate the microstructures of PEDOT:PSS and construct continuous hole-transport channels in the intrinsic PEDOT:PSS layer, and (2) to enlarge the interfacial contact and thus create more hole-transport paths from HIL to hole-transporting layer. These findings will provide a new platform for the rational regulation of HILs with efficient and rich charge-transport channels and thus further advance the realization of high-performance OLEDs.
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EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
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2019
·
IF 4.708
Shuang Li,Jiaxin Liu,Ge Li,Xueyan Zhang,Fei Xu,Zhijiang Fu,Lesheng Teng,Youxin Li,Fengying Sun
Parkinson’s disease (PD) is associated with symptoms such as tremor and bradykinesia which, together with a rigorous dosing regimen, can place an untenable burden on patients. These issues underscore the need for triggerable, modulated drug delivery systems . Currently, pramipexole (PRX) is the most widely used non-ergot dopamine agonist for the treatment of PD. In this study, near-infrared light-responsive PRX and hollow gold nanospheres (HGNS)-loaded biodegradable poly (D, L-lactide-co-glycolide) (PLGA) microspheres (PRX/HGNS MS) were fabricated using solid-in-oil-in-water (S/O/W) and water-in-oil-in-water (W/O/W) emulsion-solvent evaporation techniques to achieve modulated drug release. The PRX/HGNS MS were uniform, with an average diameter of approximately 24 µm, favorable PRX and HGNS encapsulation efficiencies (51.71 ± 0.54% and 65.15 ± 2.30%, respectively) and rapid, controllable drug release both in vitro and in vivo . Cytotoxicity tests revealed no significant differences between HGNS and PRX/HGNS MS when compared with a negative control. Pharmacodynamics and immunohistochemistry studies revealed a more rapid recovery of striatum in the group treated with PRX/HGNS MS produced using the S/O/W method. The results clearly demonstrate that light-responsive PRX/HGNS MS produced using the S/O/W method have the potential to address PD patients’ mobility problems in a smart, controllable and remotely triggerable manner.
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PubMed
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
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IF 3.261
Shengchao Miao,Zhenxing Zha,Ying Li,Xinxiang Geng,Jiahui Yang,Shihai Cui,Jing Yang
The novel semiconductor heterojunction of MIL-53(Fe)/BiOCl composite was first prepared through the solvothermal reaction. The prepared materials were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunner-Emmet-Teller (BET) and ultraviolet-visible diffuse reflectance spectroscopy (DRS). MIL-53(Fe)/BiOCl heterojunction is a kind of photoexcited materials and it accelerates the photoreactivity of BiOCl under the visible light irradiation. It was used to remove Rhodamine B (RhB) with the existence of persulfate (PS). The UV–vis spectrophotometer and the TOC detector show that the degradation rate and TOC removal efficiency of RhB (20 mg/L) are 99.5% and 69.4%within 30 min visible-light irradiation, respectively. Due to the proper band gap of material and the presence of electron acceptor, PS, the survival time of active radicals are increased. The active species h + , ·SO 4 − and ·OH are found to play the important roles during the reaction system. The possible mechanism for the RhB degradation of MIL-53(Fe)/BiOCl/PS is also proposed. Furthermore, the results of the material reusability for the degradation of RhB indicate that the MIL-53(Fe)/BiOCl has a good stability and can be used in the environmental water sample treatment.
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Nanomaterials
·
2018
·Vol. 8
·期 6
·415
·
IF 3.504
Wei Li,Hao Ding,Hua Ji,Wenbin Dai,Jianping Guo,Gaoxiang Du
A photocatalytic active CdS-TiO2heterostructure composite was prepared by hydrothermal method and its morphology and properties were characterized. Results indicate that the CdS nanoparticles deposited on the surface of a TiO2nanoparticles, which was in anatase phase. The particle scale of both of the components reached approximately 15 nm. In comparison to pure TiO2(410 nm), the light absorption edge of the heterostructure composite was 550 nm, which could extend the light response from UV to the visible region. Under visible light irradiation, the degradation efficiency of tetracycline hydrochloride by the CdS-TiO2composite achieved 87.06%, significantly enhancing photocatalytic activity than the as-prepared pure TiO2and commercial TiO2(Degussa P25). This character is attributed to the synergetic effect of these two components in the absorption of visible light.Keywords:CdS-TiO2heterostructure composite;photocatalyst;tetracycline hydrochloride
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JOURNAL OF SURFACTANTS AND DETERGENTS
·
2018
·Vol. 21
·期 5
·657-665
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IF 1.454
Shishi Pang,Wanfen Pu,Chongyang Wang
Crude oil properties significantly affect foam behavior that is important to foam application in enhanced oil recovery. This study focused on the comparison on foam behavior in the presence of light oil and heavy oil. Foamability and foam stability, the bubble size, and the film thickness as well as the configuration of oil drops were fully investigated. Final results indicated that both the heavy oil and light oil increased the foamability of sodium dodecyl sulfate but decreased that of the amphoteric surfactant imidazoline. The positive effect of both light oil and heavy oil on foam stability was reconfirmed. However, heavy oil was more favorable to foam stability. The light oil may shorten the foam half-life but prolong the foam drainage half-life. The heavy oil was more effective in reducing the foam size and increasing the foam uniformity compared with light oil. According to the micrograph of foam, light oil was emulsified into quite small oil droplets, filling the plateau borders and lamellas. The heavy oil, in the form of far larger oil droplets, was mainly distributed in plateau borders only. The larger oil droplets resulted in the more stable foam, which was verified. Moreover, light oil (oil B) performed well in thickening the foam film, as did the heavy oil (oil A). But for the lightest oil (oil C), a thinning effect on the film was detected.
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2018
·
IF 1.54
Yehua Sun,Yuzhuo Luo,Yaofeng Zhu,Yaqin Fu
Biomass-derived silk fibroin (SF)-doped NaTaO3 catalysts were successfully synthesized by a simple hydrothermal process using SF as the dopant. The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) analyses. The samples were tested as photocatalysts in the degradation of methylene blue under UV and visible light. XRD results showed the monoclinic structure of NaTaO3 lacking significant structural changes after anion doping. SEM and TEM images revealed the nanocubic morphology of the samples, the crystal particle sizes of which were about 100–300 nm. The XPS spectrum showed the peak of Ta4p3&N1s, indicating the combination of N and Ta. The UV-vis DRS results of the samples revealed a cut-off edge that red shifted from 315 nm of the pure NaTaO3 to 324 nm of the SF-doped counterpart. SF doping helped narrow the band gap and rendered the prepared sample sensitive to visible light. Under UV and visible-light irradiation, SF-doped NaTaO3 exhibited higher photocatalytic activity than that the undoped compound. SF-doped NaTaO3 samples also exhibited excellent stability during the recycling photocatalytic process.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yanping Zhu,Runliang Zhu,Yunfei Xi,Tianyuan Xu,Lixia Yan,Jianxi Zhu,Gangqiang Zhu,Hongping He
The conventional heterogeneous Fenton reaction is often confined by the lower regeneration of Fe 2+ , which then inhibits the decomposition of H 2 O 2 and the generation of OH. Here we propose a novel idea to significantly accelerate the redox cycling of Fe 2+ /Fe 3+ in heterogeneous Fenton reaction by introducing photo-generated electrons from plasmonic particles. Towards this aim, novel plasmonic Ag/AgCl nanoparticles coated ferrihydrite (Ag/AgCl/Fh) have been synthesized. Compared with pure Fh, a remarkable enhancement in the photo-Fenton degradation towards bisphenol (BPA) can be observed for all Ag/AgCl/Fh samples under visible light. Noticeably, the rate constant of 6%Ag/AgCl/Fh is 0.0506 min −1 , which is about 5.1 times as high as that of pure Fh (0.0099 min −1 ). Moreover, the catalytic activity of 6%Ag/AgCl/Fh on the degradation of BPA remains quite efficient with a low Fe leaching after 4 recycles. The results of the effect of initial pH indicates that Ag/AgCl/Fh samples exhibit relatively high photo-Fenton catalytic activity even at pH 6. The electron spin resonance (ESR) analysis reveals that OH plays a significant role in the photo-Fenton reaction. The concentration of OH can even reach 267.6 μmol/L after 60 min, which is much higher than that of pure Fh (69.2 μmol/L). The measurement of Fe 2+ concentration and the XPS Fe2p spectra of Ag/AgCl/Fh before and after the degradation of BPA indicate the loading of Ag/AgCl can accelerate the conversion of Fe 3+ /Fe 2+ by the photo generated electrons from Ag nanoparticles due to the surface plasmon resonance (SPR) effect under the visible light irradiation.
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