SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Zhenghong Zhao,Tianran Lin,Wenren Liu,Li Hou,Fanggui Ye,Shulin Zhao
Zeolitic imidazolate framework-8 (ZIF-8) has become one of the most typical examples of nanostructures for multi-enzyme immobilization due to its economical, mild and easy synthesis process. However, ZIF-8 nanocrystals are easily decomposed under acidic conditions. To solve this problem, the Fe-polydopamine (Fe-PDA) was bonded with ZIF-8 surface to form [email protected] hybrid shell with good stability. Based on this, we developed glucose [email protected] @Fe-PDA ( [email protected] @Fe-PDA) integrated nanozymes (INAzymes) with cascade reactions via a mild and environmentally friendly method. In order to synthesize the INAzymes, GOx was first embedded in ZIF-8 by coprecipitation ( [email protected] ), and then [email protected] was bonded with Fe-PDA, which acted as a peroxidase mimic. The [email protected] hybrid shell protected the INAzymes nanostructure from degradation under acidic conditions, which results in good chemical stability of the [email protected] @Fe-PDA. In the INAzymes system, glucose is converted to gluconic acid by GOx in the presence of oxygen to produce H 2 O 2 as an intermediate. The H 2 O 2 reacts rapidly with Fe-PDA to generate OH, which oxidizes 3,3′,5,5′-tetramethylbenzidine (TMB). The UV absorbance of oxidized TMB is directly proportional to the glucose concentration, and has a good linear relationship in the range of 5.0–100.0 μM glucose with detection limit of 1.1 μM. The INAzymes system has been successfully applied to rapid colorimetric detection of blood glucose levels. The INAzymes system exhibits high catalytic activity, excellent sensitivity, and enhanced chemical stability, playing great promise in clinical diagnosis and biosensing.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
·
IF 6.361
Zongchen Li,Xuemin Liu,Wei Jin,Qingsong Hu,Yaping Zhao
Arsenic species are regarded as typical water pollutants due to their toxicity. The chemical structures of arsenic species greatly influence their migration and transformation in the environment. Metal-organic frameworks (MOFs) are used as reliable adsorbents to control arsenic contamination, so it is urgently needed to study the effect of chemical structure of arsenic species during adsorption process. The adsorption behaviors of arsenate (As(V)) and its organic forms such as roxarsone (ROX), p-arsanilic acid (p-ASA) and dimethyl arsenate (DMA) by MIL-101(Fe), a type of highly porosity iron-based MOFs in aqueous environment were detailed investigated. The adsorption kinetics of those arsenic species on MIL-101(Fe) is rapid followed with pseudo-second-order kinetic model. MIL-101(Fe) exhibits excellent adsorption capacities for As(V), ROX, p-ASA and DMA with maximum adsorption capacities of 232.98, 507.97, 379.65 and 158.94 mg g −1 , respectively. The formed Fe O As inner-sphere coordination between arsenic species and the incomplete-coordinated cationic Fe in the MIL-101(Fe) cluster is the primary adsorption mechanism based on FTIR and XPS analysis. Substituent aromatic units in ROX and p-ASA strengthen the adsorption on MIL-101(Fe) through hydrogen bonds and π-π stacking interaction, resulting in higher adsorption capacities far beyond that of As(V) and DMA. The reusability of MIL-101(Fe) is limited by the strong Fe O As coordination. These results confirm MIL-101(Fe) a reliable adsorbent to control the aqueous arsenic species contamination and emphasize the significant role of the chemical structure of arsenic speciation on adsorption performances of MOFs.
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高影响因子
ACS Nano
·
2019
·
IF 13.903
Hao Ren,Xiaoli Sun,Chengfeng Du,Jin Zhao,Daobin Liu,Wei Fang,Sonal Kumar,Rodney Chua,Shize Meng,Pinit Kidkhunthod,Li Song,Shuiqing Li,Srinivasan Madhavi,Qingyu Yan
Electrocatalysts are one of the most important parts for oxygen evolution reaction (OER) to overcome the sluggish kinetics. Herein, amorphous Fe–Ni–P–B–O (FNPBO) nanocages as efficient OER catalysts are synthesized by a simple low-cost and scalable method at room temperature. The samples are chemically stable, in clear contrast to reported unstable or even pyrophoric boride samples. The Fe/Ni ratio of the FNPBO nanocages can be continuously adjusted to optimize the OER catalytic performance. The FNPBO nanocages composed of multicomponent elements can weaken the metal–metal bonds, thus rearranging the electron density around the catalytic metal atom centers and reducing the energy barrier for intermediate formation. Hence the optimized FNPBO (Fe6.4Ni16.1P12.9B4.3O60.2) catalyst shows superior intrinsic electrocatalytic activity for OER. The low overpotential to afford the current density of 10 mA cm–2 (236 mV), the small Tafel slope (39 mV dec–1), and the high specific current density (26.44 mA cm–2) at a given overpotential of 300 mV make a sharp contrast to state-of-the-art RuO2 (327 mV, 136 mV dec–1, and 0.028 mA cm–2, respectively).
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高影响因子
ACS Applied Nano Materials
·
2019
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IF 0
Fu Chen,Hui Luo,Yongzhi Cheng,Jieling Liu,Xian Wang,Rongzhou Gong
Electromagnetic (EM) interference and radiation affecting human health and the operation of precision electronic devices have drawn considerable attention in recent years. Herein, a promising microwave-absorbing material, Ag nanoparticles (AgNPs)-decorated Fe/Fe3O4@N-doped carbon (NC) composite, was designed and fabricated with the Fe2O3@polydopamine@Ag hexagonal plates as the precursor. Crystalline structure, phase conversion, micromorphology, static magnetic properties, and EM characteristics of the samples were studied by various analytical techniques. The EM parameters of the obtained samples could be manipulated by increasing the pyrolysis temperature, exhibiting gradually enhanced dielectric and magnetic loss. Optimizing the coating thickness turns out to be a critical factor for regulating microwave absorption. The product obtained at 600 °C performs a maximum reflection loss (RL) value of −37.5 dB (10.64 GHz, 1.6 mm) and an effective absorption bandwidth (RL < −10 dB) up to 7.36 GHz (10.64–18 GHz) with a thickness of only 1.4 mm. In addition, the possible EM wave absorption mechanisms were further investigated in detail. In sum, it has been confirmed that the as-obtained AgNPs-decorated Fe/Fe3O4@NC composite with ultrabroad absorption bandwidths and strong absorption capacity would be an attractive candidate material for effective EM absorption materials in the future.
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ACS Omega
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2019
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IF 2.584
Yuxiang Wu,Yan Huang,Hong Huang,Yaseen Muhammad,Zuqiang Huang,Joseph Winarta,Yanjuan Zhang,Shuangxi Nie,Zhongxing Zhao,Bin Mu
Silkworm excrement is a very useful biomass waste, composed of layer-structured fats and proteins, which are great precursors for carbon composite materials. In this work, new porous composites derived from silkworm excrement were prepared for selective separation of flavor 4-methylanisole from the binary 4-methylanisole/4-anisaldehyde mixture. In particular, the silkworm excrement, possessing a unique nanosheet structure, is converted into a graphite-like carbon by a simple calcination strategy followed by a metal-ion-doping procedure. This Fe@C composite exhibits a special nano-spongy morphology, anchoring Fe3C/Fe5C2 on the carbon nanosheets. Density functional theory simulations showed that 4-methylanisole presents a stronger π–π interaction and attraction forces with sp2 carbon nanosheets in Fe@C composites than 4-anisaldehyde. The selective adsorption experiments further confirmed that the Fe@C composites exhibited a 4-methylanisole capacity of 7.3 mmol/g at 298 K and the highest selectivity of 17 for an equimolar 4-methylanisole/4-anisaldehyde mixture among the examined adsorbents including MOFs and commercial activated carbon materials, which demonstrates the potential of this low-cost and eco-friendly porous carbon material as a promising sustainable adsorbent.
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高影响因子
INORGANIC CHEMISTRY
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2019
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IF 4.85
Jiang-Yan Xue,Fei-Long Li,Zhong-Yin Zhao,Cong Li,Chun-Yan Ni,Hong-Wei Gu,David James Young,Jian-Ping Lang
Design and synthesis of non-noble metal electrocatalysts with high activity and durability for the electrolysis of water is of great significance for energy conversion and storage. In this work, we prepared a series of Fe-doped MoS2 nanomaterials by simple one-pot solvothermal reactions of (NH4)2MoS4 with FeCl3·6H2O. An optimized working electrode of Fe-MoS2-5 displayed high hydrogen evolution reaction (HER) activity with a relatively small overpotential of 173 mV to achieve a current density of 10 mA cm–2 in 0.5 M H2SO4, along with no significant change in catalytic performance even after 1000 cyclic voltammetry (CV) cycles. Fe-MoS2 nanoparticles on nickel foam (NF; denoted as Fe-MoS2/NF) exhibited an overpotential of 230 mV at 20 mA cm–2 for the oxygen evolution reaction (OER) and 153 mV at 10 mA cm–2 for the HER in 1.0 M KOH electrolyte. Fe-MoS2/NF was stable for more than 140 h under these conditions. Furthermore, the two electrode system of Fe-MoS2/NF (anode)//Fe-MoS2/NF (cathode) electrodes demonstrated excellent electrocatalytic activity toward overall water splitting with a low potential of 1.52 V at 10 mA cm–2 in 1.0 M KOH electrolyte.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 20
·13358-13367
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IF 3.442
Zhang Rui,Wu Yuanpeng,Zhang Haiyan,Xue Shishan,Guo Meiling,Zhang Tao
In this work, we present a hydrophobic–oleophilic Fe foam for oil–water separation. Hydrophobic–oleophilic Fe foam was fabricated simply through dip-coating with n -dodecyl mercaptan. The morphology, chemical composition and water contact angle of the Fe foam were characterized. The Fe foam could absorb a variety of oils, such as diesel, toluene, xylene, cyclohexane, dodecyl methacrylate, crude oil, 1,2-dichloroethane, hexane and chloroform, these oils could be underwater or on water surface, and it exhibited excellent durability, verified by the high separation efficiency (more than 98.8% for a cyclohexane–water mixture) after reusing for 48 times. Furthermore, oil collection with the Fe foam could be controlled remotely using external magnetic field, and the Fe foam displayed high flux, good anti-corrosion and wear resistance. The simple and low-cost fabrication method enabled the Fe foam to be a promising candidate for large-scale oil–water separation and for remotely controllable water purification.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
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IF 2.829
Yanjun Liu,Ping Na,Jitao Chen,Yulong Xie
K 2 Zn 3 [Fe(CN) 6 ] 2 @ Ni-P (KNiP) composites with high cesium selectivity were synthesized for the first time. Nickel phosphorus (NiP) was used as a solid base for the adsorption of K 2 Zn 3 [Fe(CN) 6 ] 2 (KZnHCF). The synthesized KNiP composites were characterized by SEM, TEM, XRD , VSM and BET. The characteristic results demonstrated that the composites possess a ball-shape structure, a large surface area of 305.031 m 2 /g and high saturation magnetization of 2.95 emu/g. The ICP-OES analyser was used to determine the concentration of ions in this study. KNiP showed good cesium adsorption performance over a wide pH range and high selectivity for cesium over coexistent competing ions. Analysis of dynamics showed that KNiP has good adsorption performance toward cesium, with an adsorption capacity of 54.95 mg/g. Equilibrium was achieved within only two hours and the experimental data fit the Pseudo second-order model, indicating that the adsorption process was chemisorption . The adsorption process followed the Freundlich isotherm model, indicating that it mainly occured on a heterogeneous surface.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2018
·Vol. 51
·期 29
·295107
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IF 2.373
Jun Zhang,Jun Liao,Lexi Shao,Shuwen Xue,Zhiguo Wang
High quality micron-sized Cu2FexZn1−xSnS4 single crystals have been successfully fabricated by flux growth method using CuS, FeS, ZnS and SnS as the raw materials and CsCl as the fluxing agent. The effects of Fe contents on the morphology, structure and optical properties of Cu2FexZn1−xSnS4 single crystals were investigated. X-ray diffraction and Raman analyses reveal that the kesterite and stannite phases coexist in the Cu2FexZn1−xSnS4 crystals, and peak splittings of (2 0 4) and (3 1 2) are observed for the sample with x = 0.2. The optical absorption spectra reveal that the optical bandgap of the single crystal samples has little dependence on the Fe content due to the coexistence of the kesterite and stannite phases. The bandgap of the Cu2FexZn1−xSnS4 single crystal generally locates between 1.672 and 1.716 eV. Though the bandgap is not ideal as the absorber for single-junction solar cells according to the S–Q limit, it is an ideal material for the top cell in tandem solar cells and solar-driven water splitting.
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高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Junjie Pan,Xin Sun,Tao Wang,Zetao Zhu,Yuping He,Wei Xia,Jianping He
Magnetic metallic materials compounded with dielectric loss materials are promising for efficient microwave absorption as a result of the synergistic effect between dielectric loss and magnetic loss, as well as the optimized impedance matching. In this paper, porous coin-like structured Fe@MoS 2 composite has been fabricated via solvothermal method accompanied by subsequent heat treatment under H 2 /Ar atmosphere. The structure and morphology of as-prepared Fe@MoS 2 composite indicates that MoS 2 nanosheets with the two-dimensional (2D) structure are well dispersed on the porous coin-like Fe micro-sheets to form a core-shell structure. Particularly, the addition of MoS 2 regulates the permittivity as well as improves the impedance matching of the Fe@MoS 2 composite. The as-prepared composite shows efficient microwave absorption properties with the maximum effective absorption bandwidth (reflection loss below −10 dB) of about 4.73 GHz (11.13–15.86 GHz) at the corresponding coating thickness of 2.0 mm, accompanied by the minimum reflection loss of about −37.02 dB. When the calcination temperature increases to 650 °C, the effective microwave absorption frequency band shifts to the lower frequency (9.91–14.19 GHz) with the minimum reflection loss of about −35.5 dB under the coating thickness of 2.0 mm. Considering the efficient microwave attenuation, the as-fabricated porous coin-like Fe@MoS 2 composite can be a hopeful candidate in the field of microwave absorption.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2018
·Vol. 43
·期 7
·637-641
·
IF 1.749
Naimeng Song,Jianchao Liu,Guoying Zhang,Zhenzhan Yan,Hongxu Gao,Li Yang
This paper describes the preparation of two combustion catalysts Tannin-Fe (Ta−Fe) and Phloroglucinol-Fe (Ph−Fe) by spray drying. The particle size and morphology of the particles are observed by scanning electron microscopy (SEM). The results of SEM image show that the particles are regular spherical and very good dispersion. The diameter of most spherical particles is about 1 μm. The effects of Ta−Fe and Ph−Fe on the thermal decomposition of RDX and AP were tested by differential scanning calorimeter (DSC). DSC dates show that Ta−Fe and Ph−Fe can advance the high temperature exothermic peak of AP 18.0 °C and 16.1 °C, respectively. The burning rates illustrates that both Ta−Fe and Ph−Fe can significantly increase the combustion rate of HTPB propellants. The formulation with 2 mass% Ta−Fe shows an average 21.31 % increase in burning rate and has a low value of the exponent n=0.48. The formulation with 2 mass%Ph−Fe has a burning rate 20 to 60 % larger than that of the initial AP/HTPB/Al formulation, and has a lowest exponent n=0.45.
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高影响因子
CATALYSIS TODAY
·
2018
·
IF 4.667
Luyao Ren,Liangzhong Li,Shuai Chen,Hui Li,Yongdi Liu,Liyang Zhou,Su Guo,YunJiang Yu
In this study, Fe/FeS@SiO 2 yolk-shell particles (Fe/FeS@SiO 2 YSPs) were synthesized, characterized, and applied to tetrabromobisphenol A (TBBPA) removal in simulated groundwater. The X-ray photoelectron spectroscopy, X-ray diffraction, Scanning electron microscopy, transmission electron microscopy and Brunauer Emmett Teller results revealed that Fe/FeS@SiO 2 YSPs possess special structures, including active cores, mesoporous networks, shells, hollow cavities and a large surface area (85 m 2 /g vs. 8 m 2 /g) compared to Fe/FeS. The mobility of the synthesized particles in porous media was simulated with sand column experiments. Fe/FeS@SiO 2 YSPs showed a much better transportability (83.02% of particles successfully transported through the column) than Fe/FeS particles (only 1.68%), related to the better suspension stability and much lower particle surface charge (−22.7 mV vs. −7.6 mV) at neutral pH. Improved TBBPA reduction performance in synthetic solution was observed for Fe/FeS@SiO 2 YSPs over bare Fe/FeS. The transformation pathway of TBBPA was studied in detail, revealing the formation of tri-BBPA, di-BBPA, mono-BBPA and BPA as the main products. In brief, thanks to the hollow mesoporous silica spheres (HMSS) coated on the surface of Fe/FeS particles, Fe/FeS@SiO 2 YSPs showed an enhanced dispersibility, transportability and degradation of TBBPA in simulated groundwater. The results in this study proved that Fe/FeS@SiO 2 YSPs are a promising material for in situ remediation of TBBPA in soil and groundwater.
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高影响因子
危险品化学品经营许可证（带存储）