Science Bulletin
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2019
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IF 6.277
Xiang Gao,Li An,Dan Qu,Wenshuai Jiang,Yanxiao Chai,Shaorui Sun,Xingyuan Liu,Zaicheng Sun
Photocatalytic N 2 fixation involves a nitrogen reduction reaction on the surface of the photocatalyst to convert N 2 into ammonia. Currently, the adsorption of N 2 is the limiting step for the N 2 reduction reaction on the surface of the catalyst. Based on the concept of photocatalytic water splitting, the photocatalytic efficiency can be greatly enhanced by introducing a co-catalyst. In this report, we proposed a new strategy, namely, the loading of a NiS co-catalyst on CdS nanorods for photocatalytic N 2 fixation. Theoretical calculation results indicated that N 2 was effectively adsorbed onto the NiS/CdS surface. Temperature programmed desorption studies confirmed that the N 2 molecules preferred to adsorb onto the NiS/CdS surface. Linear sweep voltammetry results revealed that the overpotential of the N 2 reduction reaction was reduced by loading NiS. Furthermore, transient photocurrent and electrochemical impedance spectroscopy indicated that the charge separation was enhanced by introducing NiS. Photocatalytic N 2 fixation was carried out in the presence of the catalyst dispersed in water without any sacrificial agent . As a result, 1.0 wt% NiS/CdS achieved an ammonia production rate of 2.8 and 1.7 mg L −1 for the first hour under full spectrum and visible light ( λ > 420 nm), respectively. The catalyst demonstrated apparent quantum efficiencies of 0.76%, 0.39% and 0.09% at 420, 475 and 520 nm, respectively. This study provides a new method to promote the photocatalytic efficiency of N 2 fixation.
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JOURNAL OF NANOBIOTECHNOLOGY
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2019
·Vol. 17
·期 1
·1-12
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IF 5.345
Zhao Bin,Zhao Penghe,Jin Zhaokui,Fan Mingjian,Meng Jin,He Qianjun
Background To improve the outcome of cancer treatment, the combination of multiple therapy models has proved to be effective and promising. Gas therapy (GT) and chemodynamic therapy (CDT), mainly targeting the mitochondrion and nucleus, respectively, are two emerging strategy for anti-cancer. The development of novel nanomedicine for integrating these new therapy models is greatly significant and highly desired. Methods A new nanomedicine is programmed by successive encapsulation of MnO 2 nanoparticles and iron carbonyl (FeCO) into mesoporous silica nanoparticle. By decoding the nanomedicine, acidity in the lysosome drives MnO 2 to generate ROS, ·OH among which further triggers the decomposition of FeCO into CO, realizing the effective combination of chemodynamic therapy with gas therapy for the first time. Results Acidity in the TEM drives MnO 2 to generate ROS, ∙OH among which further triggers the decomposition of FeCO into CO, realizing the effective combination of CDT and CDGT. The co-released ROS and CO do damage to DNA and mitochondria of various cancer cells, respectively. The mitochondrial damage can effectively cut off the ATP source required for DNA repair, causing a synergetic anti-cancer effect in vitro and in vivo. Conclusions The combination of CDT and CDGT causing a synergetic anti-cancer effect in vitro and in vivo. The proposed therapy concept and nanomedicine designing strategy might open a new window for engineering high-performance anti-cancer nanomedicine.
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Crystals
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2019
·Vol. 9
·期 9
·477
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IF 2.061
Qian-Jun Deng,Min Chen,Dong-Chu Chen,Chang-Ai Chen
The organic ligand (1-methyl-1H-benzo[d]imidazol-2-yl)methanol (HL) was used to react with CoX2·6H2O (X = Cl and Br) under solvothermal conditions to obtain the complex [Co4(L)6(X)2] (1, X = Cl; 2, X = Br). The butterfly-shaped structure of complex 1 and 2 suggest that Co(II) ions have two different coordinated modes, which are five coordination with O3NX environment and six coordination with O4N2environment. In addition, the electrospray ionization mass spectrometry (ESI-MS) analysis indicated that the ion molecular fragment of highest intensity was [Co4(L)6]2+, and there existed a high nuclear fragment peak of [Co7(L)12]2+. Interestingly, it was basically completely transformed into [Co7(L)12]2+two days later, so those two complexes were relatively stable in CH3OH. Magnetic characterization exhibited that complex 1 and 2 display field-induced single-molecule magnetic behavior, of which the energy hillsUeff/kBwere 28 and 20 K under direct-current field of 0.1 T, respectively.Keywords:tetranuclear;butterfly shaped;mass spectrometric;single-molecule magnet (SMM)
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Binglu Deng,Hanjin Luo,Zhongqing Jiang,Zhong-Jie Jiang,Meilin Liu
A simple co-polymerization method has been employed to prepare polysilicic-zirconium (PSZr), consisting of chemical species of ZrSi 24 O 50 , ZrSiO 4 , and Zr 5 Si 3 . The obtained PSZr is found to be highly active as the coagulant for the purification of the raw water and humic acid wastewater. The performance of PSZr on the wastewater purification is greatly dependent upon the synthetic temperature of PSZr, and the mole ratio of Si:Zr, and the basicity of the PSZr. It shows that PSZr synthesized at the temperature of 20–25 °C with the mass fraction of polysilicic acid of 1.5%, the mole ratio of Si:Zr of 1:1, and a basicity of 0.25, is relatively more efficient for water purification and could achieve the UV 254 (Ultraviolet wavelength less than 254 nm) and total organic carbon removals of 81.23% and 66.85% and residual turbidity of 0.86 NUT in the raw water, and the UV 254 and TOC removals of 99.20% and 74.21% in simulated humic acid wastewater, respectively. These results clearly demonstrate that PSZr could be used as the coagulant for the wastewater treatments.
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Materials
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2018
·Vol. 11
·期 8
·1468
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IF 2.467
Yun Gu,Le-Qing Fan,Jian-Ling Huang,Cheng-Long Geng,Jian-Ming Lin,Miao-Liang Huang,Yun-Fang Huang,Ji-Huai Wu
Co@NiSe2electrode materials were synthesized via a simple hydrothermal method by using nickel foam in situ as the backbone and subsequently characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and a specific surface area analyzer. Results show that the Co@NiSe2electrode exhibits a nanowire structure and grows uniformly on the nickel foam base. These features make the electrode show a relatively high specific surface area and electrical conductivity, and thus exhibit excellent electrochemical performance. The obtained electrode has a high specific capacitance of 3167.6 F·g−1at a current density of 1 A·g−1. To enlarge the potential window and increase the energy density, an asymmetric supercapacitor was assembled by using a Co@NiSe2electrode and activated carbon acting as positive and negative electrodes, respectively. The prepared asymmetrical supercapacitor functions stably under the potential window of 0–1.6 V. The asymmetric supercapacitor can deliver a high energy density of 50.0 Wh·kg−1at a power density of 779.0 W·kg−1. Moreover, the prepared asymmetric supercapacitor exhibits a good rate performance and cycle stability.Keywords:Co-doped NiSe2;nanowire;hydrothermal method;pseudocapacitance;asymmetric supercapacitors
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
Jing Chen,Huanming Wei,Haijun Chen,Wenhao Yao,Hualin Lin,Sheng Han
The N/P co-doped hierarchical porous carbon materials are synthesized by SiO 2 -template approach following potassium phosphate activation. Polyvinylidene fluoride is used as the carbon source, melamine as the nitrogen source and potassium phosphate as the phosphorus source and activator. The obtained porous carbon materials exhibit a hierarchical pore structure (∼0.6 and ∼4 nm), a large specific surface area (1431 m 2 g −1 ) and a high nitrogen and phosphorus content. These predominant characteristics enable the CNP-5-800 sample to exhibit a superior specific capacitance of 337 F g -1 at 0.5 A g −1 and outstanding cycling stability of 97.8% retention after 10000 cycles in a three-electrode system. Even in the two-electrode system (an all-solid-state symmetric capacitor), this kind of materials still can deliver an energy density of 23.1 W h kg −1 to 12.4 W h kg −1 at power densities of 720.4 W kg −1 to 13950 W kg −1 , respectively, and a cycling property of 98.7% maintenance after 5000 cycles. Therefore, the practicable synthetic method and excellent electrochemical performance make CNP- x - y materials a potential candidate in supercapacitor application.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 26
·期 33
·33847-33855
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IF 2.8
Wang He-xuan,Zhu Li-nan,Guo Fu-qiao
Atrazine, one of the most widespread herbicides in the world, is considered as an environmental estrogen and has potential carcinogenicity. In this study, atrazine was degraded on boron-fluorine co-doped TiO 2 nanotube arrays (B, F-TiO 2 NTAs), which had similar morphology with the pristine TiO 2 NTAs. The structure and morphology of TiO 2 nanotube samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV-visible diffuse reflectance spectroscopy (DRS). It showed that the decoration of fluorine and boron made both the absorption in the visible region enhanced and the band edge absorption shifted. The efficiency of atrazine degradation by B, F-TiO 2 NTAs through photoelectrocatalysis was investigated by current, solution pH, and electrolyte concentration, respectively. The atrazine removal rate reached 76% through photoelectrocatalytic reaction by B, F-TiO 2 NTAs, which was 46% higher than that under the photocatalysis process. Moreover, the maximum degradation rate was achieved at pH of 6 in 0.01 M of Na 2 SO 4 electrolyte solution under a current of 0.02 A and visible light for 2 h in the presence of B, F-TiO 2 NTAs. These results showed that B, F-TiO 2 NTAs exhibit remarkable photoelectrocatalytic activity in degradation of atrazine.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Xiao He,Ayang Zhou,Chang Shi,Jinli Zhang,Wei Li
A co-crosslinked poly(ether imide) (PEI) material with excellent organic solvent resistance was synthesized using mixed amines of aliphatic ethylenediamine (EDA) and aromatic p-xylylenediamine (XDA), on which the organic solvent nanofiltration (NF) membrane was prepared via the interfacial polymerization between the monomer 1,2,4,5-benzene tetracarbonyl chloride (BTC) and the amine terminals on the co-crosslinked PEI. Structural characterizations indicate that the EDA-XDA co-crosslinking is an effective pathway to modulate the species and the amount of amine terminals on the surfaces, which can in turn affect the toplayer thickness and the surface roughness of the synthesized NF membrane. The results illustrate that the NF membrane prepared on the EDA-XDA (1:1) co-crosslinked PEI (c-P/1E1X) possesses superior separation performance and stability for N,N-dimethylformamide (DMF) solution. Further, the superior solvent resistant NF membrane gly-NF-c-P/1E1X-XDA was synthesized through an additional quick patching-like IP using XDA, with the aid of ethylene glycol filling inside the intermediate pores. The membrane gly-NF-c-P/1E1X-XDA shows the DMF permeance of 6.1 L m −2 h −1 MPa −1 and the Rose Bengal (RB) rejection about 89%, and for a 5 g/L ceftazidime antibiotic DMF solution, the permeance is 4.6 L m −2 h −1 MPa −1 and the ceftazidime rejection is 81%, which is promising to be applied for the recovery of heat sensitivity ceftazidime in DMF solution.
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MODERN PHYSICS LETTERS B
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2017
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IF 0.617
Peiju Hu,Wei Zhang,Zhengfa Hu,Zuyong Feng,Lun Ma,Xiuping Zhang,Xia Sheng,Li Luo,Yinhai Wang
Dy-Bi co-doped yttrium tungstate crystal materials were synthesized by high temperature solid-state method. To reveal the photoluminescence features and properties of the samples, some measurements have been taken. It turned out that different Bi 3 + concentrations play obvious influence in emission performance, and show visible light emission under ultraviolet light excitation. Besides, the effect of temperature on phase structure of samples has also been studied here. Superhigh X-ray luminescence of the phosphors exhibited the promising application in the field of high energy detection. The X-ray irradiation crystal resistance stability of the phosphors has also been investigated through the subsequent testing of XRD and spectra.
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ACS Sustainable Chemistry & Engineering
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2017
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IF 5.951
Xiaohao Liu,Wenda Jia,Guangyue Xu,Ying Zhang,Yao Fu
Cyclohexanols are important feedstock for polymers, spices, and medicines production in industry. In this work, a series of cobalt-based catalysts with different supports were prepared and used to catalyze lignin-derived phenols to cyclohexanols. Among the catalysts, Co/TiO2 showed the best hydrodeoxygenation (HDO) activity. An equivalent of propylcyclohexanol (>99.9%) was achieved under 1 MPa H2, 200 °C for 2 h. According to the characterization results of transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) surface area analysis, powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H2-TPR), hydrogen temperature-programmed desorption (H2-TPD) and NH3-TPD, the particle size and dispersion of Co could have important influence on catalytic activity. For Co/TiO2, the SMSI effect may significantly affect the catalytic activity. The influences of different temperature, H2 pressure and reaction time on the eugenol conversion by Co/TiO2 were explored. 99% yield of propylcyclohexanol could even be obtained under 0.4 MPa H2, 180 °C for 8 h. This should be the mildest condition that has been reported for HDO of eugenol to propylcyclohexanol catalyzed by non-noble metal catalyst. On the basis the mechanism and substrates extension studies, all the Co-based catalysts selected in this study showed high activity to cleave the Caryl–OCH3 bond before the hydrogenation of the aromatic ring when the −OCH3 group substituted at ortho-position.
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Nanoscale Research Letters
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2017
·Vol. 12
·期 1
·1-7
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IF 2.833
Bo Tang,Zhengwei Wang,Huang Weiqiu,Sen Li,Tingting Ma,Haogang Yu,Xufei Li
With the development of microelectronic devices, the insufficient heat dissipation ability becomes one of the major bottlenecks for further miniaturization. Although graphene-assisted epoxy resin (ER) display promising potential to enhance the thermal performances, some limitations of the reduced graphene oxide (RGO) nanosheets and three-dimensional graphene networks (3DGNs) hinder the further improvement of the resulting thermal interface materials (TIMs). In this study, both the RGO nanosheets and 3DGNs are adopted as co-modifiers to improve the thermal conductivity of the ER. The 3DGNs provide a fast transport network for phonon, while the presence of RGO nanosheets enhances the heat transport at the interface between the graphene basal plane and the ER. The synergy of these two modifiers is achieved by selecting a proper proportion and an optimized reduction degree of the RGO nanosheets. Moreover, both the high stability of the thermal conductivity and well mechanical properties of the resulting TIM indicate the potential application prospect in the practical field.
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Energy Technology
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2024
·
IF 3.6
Yongchao Hao,Ling Wang,Shuling Cheng,Huiya Cheng,Qianyun He,Lizhi Yi
Developing an efficient oxygen evolution reaction (OER) catalyst is the footstone of many electrochemical energy conversion devices. Herein, a cobalt–manganese bimetallic metal–organic framework (MOF) is developed as an efficient OER catalyst (denoted as Co 3 Mn 1 BDC). The Co 3 Mn 1 BDC nanosheets demonstrate advantages in specific surface area, pore size distribution comparing with monometallic Co BDC and Mn BDC. The performance investigations demonstrate that the doping of Mn in Co-based MOFs facilitates the electrochemical area, charge transfer efficiency, reaction kinetics, and turnover frequency. As a consequence, the Co 3 Mn 1 BDC exhibits a low overpotential of 289 mV at current of 10 mA cm −2 and a favorable Tafel slope of 56.8 mV dec −1 on glassy carbon electrode, which is better than IrO 2 . When the catalyst is loaded on Ni foam, the overpotential and Tafel slope are further decreased to 231 mV and 50.8 mV dec −1 . Moreover, the Raman spectrum confirms that the Co 3 Mn 1 BDC can be transformed into active CoOOH, suggesting the bright prospect in electrocatalysis devices as “precatalyst”.
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