INTERNATIONAL JOURNAL OF THERMOPHYSICS
·
2014
·Vol. 35
·期 8
·1450-1464
·
IF 0.623
Wang Sheng,Zhang Ying,He Mao-Gang,Zheng Xiong,Chen Li-Bin
Transport and thermodynamic properties of pentane are necessary for the design and verification of reactors in pentane isomerization and degradation processes. However, there are few experimental data of these properties, especially in the high-temperature region. In this work, the thermal diffusivity and the sound speed of pentane have measured by dynamic light scattering and Brillouin light scattering, respectively. Pentane has been investigated under saturated conditions over a wide temperature range, from about 300 K up to the liquid–vapor critical point. It is estimated that: the standard uncertainty of temperature is \(u(T) = 0.01\) K for the hydrodynamic region and \(u(T) = 0.026\) K for the critical region; the relative expanded uncertainty in the thermal diffusivity is \(U_\mathrm{r}(a) = 0.03\) and the relative expanded uncertainty in the speed of sound is \(U_\mathrm{r}(c_\mathrm{s}) = 0.005\) with a coverage factor of \(k = 2\) . The thermal diffusivity and the sound-speed experimental data are also represented as functions of temperature. Finally, the results are discussed in detail in comparison with literature results and various prediction methods.
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高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 43
·期 3
·982-989
·
IF 3.806
Bo Chai,Xiang Liao,Fakun Song,Huan Zhou
Fullerene modified C3N4 (C60/C3N4) composites with efficient photocatalytic activity under visible light irradiation were fabricated by a simple adsorption approach. The as-prepared C60/C3N4 composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance absorption spectra (DRS), Fourier transform infrared spectroscopy (FTIR) and photoluminescence spectra (PL). The photocatalytic degradation of rhodamine B (RhB) by the C60/C3N4 composites was investigated and optimized, suggesting that the optimal amount of C60 in the composites was 1 wt%. The significantly enhanced photocatalytic activity could be attributed to the efficient separation of photogenerated electrons and holes in the C60/C3N4 composites. A possible mechanism of C60/C3N4 composites as photocatalysts was proposed.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Chao Nan Zhu,Tianwen Bai,Hu Wang,Wei Bai,Jun Ling,Jing Zhi Sun,Feihe Huang,Zi Liang Wu,Qiang Zheng
Bioluminescence is widespread in nature such as the jellyfish, which inspires scientists to design polymer hydrogels with tunable fluorescence. However, it remains a big challenge to develop white-light-emitting hydrogels with local tunability of the fluorescent behavior. Herein, we report a white fluorescent hydrogel prepared by one-pot micellar copolymerization of hydrophilic acrylamide and hydrophobic single donor–acceptor chromophore monomer, in which the unimer and the dimer of the chromophore coexist and generate high- and low-energy emission, respectively, under excitation. The fluorescent behavior of the hydrogel can be well tuned by phototreatment or heat treatment that induces unimer-to-dimer transformation of the chromophore and thus variation of the fluorescent color from blue to white and then to yellow. The fluorescence can also be reversibly switched off by forming terpyridine–Cu2+ chelate complexes and recovered by using chelating agent to extract the Cu2+ ions out of the gel matrix. These properties afford patterning the fluorescent hydrogel, which is transparent under daylight yet shows the pattern under ultraviolet light. These patterned fluorescent hydrogels should find applications in protected message display for improved information security.
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ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Yu Zhao,Xiaowen Zhou,Wenzhe Huang,Jiachen Kang,Gufeng He
Highly conductive and robust polyvinyl alcohol/copper nanowire (PVA/CuNW) flexible transparent conductive electrode (FTCE) is fabricated via a simple and low-cost process at room temperature . The CuNW film is formed on a mixed cellulose ester (MCE) membrane by vacuum filtration. Subsequently, the flowing glacial acetic acid (GAA)-toluene solution passes through them to remove the oxide layer without damaging nanowires. The final PVA/CuNW FTCE is constructed by embedding the treated CuNWs into a pre-prepared PVA binding layer on the polyethylene terephthalate (PET) substrate, which presents excellent conductivity with a low sheet resistance of 46.2 Ω / s q and a high transparency of 90.5% at 550 nm. Meanwhile, the chemical and mechanical stability have been significantly enhanced compared with the bare CuNW FTCE attributed to the protective effect of the PVA binding layer. A flexible phosphorescent OLED device using such PVA/CuNW FTCE as the anode exhibits a current efficiency of 26.4 cd/A at 1000 cd/m 2 , which is comparable to that of the reference device (27.1 cd/A) based on indium tin oxide anode on glass, indicating its high potential for application in flexible optoelectronics .
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 14
·14422-14430
·
IF 2.76
Yan QiShe,Xu MengMeng,Lin CuiPing,Hu JiFei,Liu YongGang,Zhang RuiQin
A facile, environmental-friendly Ag 3 PO 4 -PN photocatalyst was synthesized by a simple precipitation method at room temperature in the presence of ammonia and polyvinyl pyrrolidone (PVP). As-synthesized samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–visible diffuse reflectance spectroscopy (UV–vis DRS). The enhancement of photocatalytic efficiency of Ag 3 PO 4 -PN is strongly dependent on the excellent photo-absorption capacity, sharp edges and corners, and synergistic effect of PVP and NH 3 ·H 2 O. The effects of catalyst dosage, TC concentration and solution pH were explored with tetracycline hydrochloride (TC) as target contamination. The mineralization was evaluated by total organic carbon (TOC) analysis and determination of the concentration of inorganic ions such as NO 3
− and Cl − . Radical detection experiment indicated the h + and ·O 2− are major active species in the degradation of TC by Ag 3 PO 4 -PN. Moreover, photocatalyst stability and regeneration experiments exhibited the favorable stability and rejuvenation ability, suggesting a promising prospect of practical application of Ag 3 PO 4 in the wastewater treatment.
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Energy & Environmental Science
·
2013
·Vol. 6
·期 7
·2134-2144
·
IF 11.653
Zheng Wang,Jungang Hou,Chao Yang,Shuqiang Jiao,Kai Huang,Hongmin Zhu
Hierarchical tantalum-based oxide and (oxy)nitride with hollow urchin-like nanostructures have been synthesized for the first time by an in situ self-assembly wet-chemical route in addition with post-thermal nitridation. Notably, a single-phase metastable γ-TaON with hollow urchin-like spheres among the tantalum (oxy)nitrides was obtained during the phase transformation process from an orthorhombic Ta2O5 to a typical monoclinic β-TaON, corresponding the order of phase formation: Ta2O5 → γ-TaON → β-TaON → Ta3N5. The combined effect of the crystal and electronic structures and hierarchical morphology on the tunable photocatalytic and photoelectrochemical performances of the tantalum-based photocatalysts was systematically investigated. Efficient photocatalytic hydrogen production as high as 381.6 μmol h−1 with an apparent quantum efficiency of 9.5% under 420 nm irradiation (about 47.5 times higher than that of the conventional TaON) was achieved over this metastable γ-TaON architecture. Furthermore, the hierarchical γ-TaON photoanode exhibited a photocurrent density of ∼1.4 mA cm−2 at 0.8 V vs. SCE in Na2SO4 solution under visible light irradiation. This excellent photocatalytic activity is ascribed to the unique urchin-like nanostructure with large specific surface area, the metastable crystal structure and appropriate electronic structure as well as the efficient charge carrier separation.
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MATERIALS LETTERS
·
2023
·
IF 3
Sundaraperumal Kanniga Devi,Vediyappan Thirumal,A. Balamurugan,Balakrishna Avula,Uma Devi Pongiya,Jinho Kim,Chinnasamy Surya
In a hydrothermal process, the NiCoMn(OH) 6 (NiCoMn-LDH) was synthesized. Tetracycline (TC) degradation being exposed to visible light provided an evaluation of the photocatalytic performance of the catalysts as prepared. About 96% of the TC was removed at its maximum by the NiCoMn-LDH that was employed. The NiCoMn-LDH performed better at degrading materials than Mn 2 O 3 performed. Discussions were held regarding the potential photocatalytic degradation mechanism.
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高影响因子
Nanoscale
·
2013
·Vol. 5
·期 21
·10573-10581
·
IF 6.233
Jing Jiang,Lizhi Zhang,Hao Li,Weiwei He,Jun Jie Yin
In this study we demonstrate that self-doping and surface plasmon resonance could endow a wide-band-gap ternary semiconductor BiOCl with remarkable visible light driven photocatalytic activity on the degradation of organic pollutants and photocurrent generation properties. The self-doped BiOCl with plasmonic silver modification was synthesized by a facile one-pot nonaqueous approach and systematically characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-visible diffuse reflectance spectra, electron spin resonance, and X-ray photoelectron spectroscopy. The photocurrent enhancement was found to be intimately dependent on the irradiation wavelength and matched well with the intensity of the absorption of the Ag nanoparticles. Reactive species trapping experiments and electron spin resonance spectroscopy with 5,5-dimethyl-1-pyrroline-N-oxide spin-trapping adducts confirmed that more oxidative species could be generated from the photogenerated electrons due to the plasmon-excitation of the metallic Ag in the self-doped BiOCl with plasmonic silver modification, which is responsible for the great enhancement of photocatalytic activity and photocurrent. Surface photovoltage spectroscopy and time-resolved photoluminescence spectroscopy results revealed the transfer of plasmon-band-induced electrons from Ag nanoparticles into BiOCl and the acceleration effect of surface plasmon resonance-induced intense oscillating electric fields on this electron transfer. This study would not only provide direct evidence of plasmonic photocatalysis, but also shed light on the design of highly efficient metal–semiconductor composite photocatalysts.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 22
·16696-16703
·
IF 2.019
Yan Qishe,Xie Xin,Lin Cuiping,Zhao Yalei,Wang Shenbo,Liu Yonggang
The nano-scale Ag 3 PO 4 was successfully synthesized by the silver ammonia complexing precipitation method at room temperature. And the Graphene oxide (GO)/Ag 3 PO 4 nanocomposites with different contents of GO were successfully synthesized using the electrostatic driving method. The as-prepared GO/Ag 3 PO 4 nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV–visible diffuse reflectance spectroscopy (UV–Vis DRS), confirming that Ag 3 PO 4 were highly dispersed to GO sheet. The photocatalytic properties of GO/Ag 3 PO 4 were evaluated by the degradation of Methyl Orange (MO) under visible light irradiation and solar irradiation respectively. The results showed that the photocatalytic efficiencies of GO/Ag 3 PO 4 nanocomposites had enhanced largely and the kinetics reaction models were followed first-order. Furthermore, 5% GO/Ag 3 PO 4 exhibited the highest photocatalytic activity on degradation of MO under visible-light irradiation. The improved photocatalytic performances of the GO/Ag 3 PO 4 nanocomposites mainly attributed to the introducing of GO, which benefit for electron transfer and inhibit the recombination of electron–hole pairs, promoting the practical application of Ag 3 PO 4 in water purification.
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RSC Advances
·
2015
·Vol. 5
·期 121
·99927-99934
·
IF 3.84
Chao Wang,Wenshuai Zhu,Zhigang Chen,Sheng Yin,Peiwen Wu,Suhang Xun,Wei Jiang,Ming Zhang,Huaming Li
An aerobic oxidative deep-desulfurization process for aromatic sulfides, such as dibenzothiophene (DBT), benzothiophene (BT), 4,6-dimethyldibenzothiophene (4,6-DMDBT), was carried out via ionic liquids (ILs) extractive coupled with photochemical oxidation. In this process, sulfur compounds in n-octane were firstly extracted into the IL phase and then oxidized to corresponding sulfones. The sulfur removal efficiency of DBT with air as the oxidizing agent could reach up to 99.1% under mild conditions. Then, a possible reaction mechanism of this metal-free photochemical oxidative desulfurization system was proposed. The sulfur removal efficiency decreased slightly, even though the original S-concentration of DBT increased from 500 to 1000 ppm. The oxidation reactivity of different sulfur compounds decreased in the order of: DBT > 4,6-DMDBT > BT. The influences of alkene and aromatic addition were also investigated. Gas Chromatograph-Mass Spectrometer (GC-MS) measurements demonstrated that the sulfur compounds were converted to their corresponding sulfones and separated out of the oil phase. Under optimal conditions, the IL could be recycled at least 5 times without a remarkable decrease in activity.
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JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 50
·期 4
·1718-1727
·
IF 2.305
Shi Lei,Liang Lin,Wang Fangxiao,Liu Mengshuai,Sun Jianmin
A facile direct growth method was developed for the fabrication of Ag 2 CO 3 nanoparticles on the surface of g-C 3 N 4 at room temperature. The as-prepared g-C 3 N 4 /Ag 2 CO 3 composites were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy with energy dispersion X-ray spectroscopy, UV–vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The photocatalytic activities were evaluated by degrading Rhodamine B dye. The results indicated that Ag 2 CO 3 nanoparticles with the size of 5–10 nm were finely distributed on the surface of g-C 3 N 4 sheet, leading to the enhancement of the photocatalytic activity. And when the mass ratio of g-C 3 N 4 to Ag 2 CO 3 was 1:4, the as-prepared composites exhibited the optimum photocatalytic activity, which was approximately 8 and 3 times higher than pure g-C 3 N 4 and Ag 2 CO 3 , respectively. The enhanced photocatalytic performance could be attributed to the synergetic effects between g-C 3 N 4 and Ag 2 CO 3 , including the smaller particle size of Ag 2 CO 3 and high charge separation efficiency of the photogenerated electron–hole pair. More attractively, the stability of Ag 2 CO 3 was improved due to its highly dispersion on g-C 3 N 4 sheet. In addition, based on the experimental results, the Z-scheme mechanism for the photodegradation over g-C 3 N 4 /Ag 2 CO 3 composites was proposed.
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Journal of Physical Chemistry C
·
2025
·
IF 3.2
Hui Huang,Xuan Yang,Jialong Zhao,Ruosheng Zeng,Tao Lin
Luminescent solar concentrators (LSCs) are limited by intrinsic escape-cone losses that reduce their light-harvesting efficiency. In this work, we introduce a strip-array waveguide design that enhances light trapping to 85%, exceeding the theoretical limit imposed by total internal reflection (TIR). Using tetramethylammonium manganese chloride (TMAMnCl3) as the fluorophore, the device achieves an optical efficiency of 7.9% and a corresponding solar power conversion efficiency of 4.4% when all four edges are coated. The improved performance is attributed to reduced escape-cone loss, suppressed scattering, and a broad absorption spectrum (300–550 nm) that aligns with the high-intensity region of the solar spectrum. A stamping-assisted fabrication approach enables straightforward pattern definition and is compatible with various polymer matrices and emissive materials, offering a scalable route toward integrated LSC–PV devices.
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