INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Haifeng Hu,Liu Yang,Zhen Lin,Xiaotong Xiang,Xiancai Jiang,Linxi Hou
A novel magnetic bioadsorbent beads composed of Fe 3 O 4 , chitosan, and Al(OH) 3 (Fe 3 O 4 /CS/Al(OH) 3 ) was synthesized by a modified solvothermal and in-situ reaction. The composite adsorbent was characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and vibrating sample magnetometer, respectively. Adsorption toward F − onto Fe 3 O 4 /CS/Al(OH) 3 was investigated as a function of Fe 3 O 4 concentration, initial solution pH, adsorbent dosage, initial fluorion concentration, co-existing ions in water and initial temperature. The addition of Fe 3 O 4 could enhance the adsorption properties of CS/Al(OH) 3 . The saturated adsorption capacity of magnetic Fe 3 O 4 /CS/Al(OH) 3 calculated from the Langmuir isotherm model was 76.63 mg/g at 298 K. The adsorption isotherm of F − followed Langmuir isotherm model and the adsorption kinetics fitted better to the pseudo-second order kinetic model. The influence of temperature confirmed that the adsorption was spontaneous and endothermic. The magnetic Fe 3 O 4 /CS/Al(OH) 3 beads could be easily separated from water under a low magnetic field.
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高影响因子
Catalysis Science & Technology
·
2014
·Vol. 4
·期 4
·1028-1037
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IF 4.76
Haiping Li,Quanhua Deng,Jingyi Liu,Wanguo Hou,Na Du,Renjie Zhang,Xutang Tao
Bi2MoO6/Zn–Al layered double hydroxide (LDH) hierarchical heterostructures assembled from Bi2MoO6 hierarchical hollow spheres and Zn–Al LDH nanosheets were synthesized by a low-temperature hydrothermal method. X-ray diffraction, Fourier transform-infrared spectroscopy, thermogravimetric analysis and X-ray photoelectron spectroscopy (XPS) confirmed the formation of the Bi2MoO6/Zn–Al LDH composites. Morphologies were characterized by scanning electron microscopy and transmission electron microscopy (TEM). XPS and high resolution TEM indicated the formation of a Bi2MoO6/Zn–Al LDH heterojunction. Increasing the LDH content from 0 to 27.0 wt.% caused the Brunauer–Emmett–Teller (BET) specific surface area of the composites to gradually increase. The photocatalytic degradation activity for Rhodamine B (RhB) under visible light irradiation exhibited a large enhancement, followed by a decrease, with increasing LDH content. The Bi2MoO6/Zn–Al LDH heterostructure composite with LDH content of 5.5 wt.% showed the highest photocatalytic activity and degraded 99% of RhB in 80 min, while Bi2MoO6 degraded less than 50%. The average photocatalytic efficiency is enhanced by more than 100%. The enhanced photocatalytic activity of the Bi2MoO6/Zn–Al LDH heterostructure photocatalyst was mainly attributed to the efficient separation of photoinduced electrons and holes. Superoxide radicals and holes were the major active species. The Bi2MoO6/Zn–Al LDH heterostructure photocatalyst exhibited excellent stability and reusability. A detailed mechanism for its enhanced photocatalytic activity was discussed in this study. This work provides an effective way to fabricate a series of Bi-based and LDH-containing heterostructure photocatalysts.
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Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Tianrong Zhan,Yang Song,Xianjun Li,Wanguo Hou
The plate-like Zn-Al layered double hydroxide modified with 1-aminopropyl-3-methylimidzaolium tetrafluoroborate (named as ILs-LDH) was synthesized by coprecipitation method. Several techniques confirmed the layered structure of ILs-LDH with a disk-like morphology. A novel electrochemical sensor based on ILs-LDH modified glass carbon electrode (GCE) was developed for bisphenol A (BPA) determination. Experimental factors including modified content, pH, scan rate, accumulation time and potential had been carefully optimized. ILs-LDH/GCE performed the excellent electro-oxidation ability toward BPA with the more negative oxidation overpotential and larger peak current than bare GCE or LDH/GCE. Differential pulse voltammetry determination of BPA afforded a wider linear range from 0.02 to 3 μM with the detection limit of 4.6 nM (S/N = 3). The fabricated sensor demonstrated an acceptable reproducibility, good stability and high sensitivity. The proposed method was successfully used to detect BPA in real water samples with satisfactory recovery ranging from 94.9% to 102.0%.
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高影响因子
Energy Technology
·
2016
·Vol. 4
·期 9
·1112-1118
·
IF 2.557
Handong Jiao,Junxiang Wang,Jiguo Tu,Haiping Lei,Shuqiang Jiao
An aluminum-ion asymmetric supercapacitor was assembled utilizing a cathode made of multi-walled carbon nanotubes (MWCNTs) in an ionic liquid 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl)-based electrolyte. Two types of energy-storage mechanisms, that is, electrochemical double-layer capacitance (adsorption/desorption of AlCl 4 − on the surface) and limited intercalation pseudocapacitance (intercalation/deintercalation of AlCl 4 − in the graphite layer) at low current density, were observed and characterized. Meanwhile, the specific capacitance and cyclic stability of this supercapacitor were also evaluated by using galvanostatically charging–discharging. The result demonstrates that the specific capacitance decreases with increasing current density, which corresponds to the two types of energy-storage mechanisms of this device. The corresponding retention rate of this device after 3500 cycles at current density of 0.4 A g −1 was 82.4 %, which shows good cyclic stability.
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高影响因子
THIN-WALLED STRUCTURES
·
2024
·
IF 5.7
Shixiang Yu,Zhiqiang Zhang,Qin Wang,Hongjie Jia,Mingwen Ren
In order to improve the interfacial strength and toughness of aluminum alloys and CFRP (carbon fiber reinforced plastics) hybrid laminates, modified resin with lower porosity was prepared by adding nano silica treated with silane coupling agent into epoxy resin. Al/CFRP hybrid laminates with modified resin were prepared by physical liquid deposition method and hot-press process. The strength and toughness of Al/CFRP hybrid laminates with modified resin were evaluated by tensile shear test and end notch fracture (ENF) test. The experimental results showed that the interfacial shear strength of Al/CFRP hybrid modified resin laminates is 18.8 ± 0.8 MPa and the fracture energy is 1546.33 ± 10.26 J /m 2 , which is 28.76 % and 15.38 % higher than that of Al/CFRP hybrid laminates with raw resin, respectively. The well-dispersed silicon nanoparticles effectively mitigate internal stress during the cross-linking process of the modified resin, thereby diminishing the dimensions of microcracks within the modified resin. The transition layer of the modified resin interface formed a cooperative and smooth structure. This structure can ensure that the transition of elements in the interface layer is smooth, and it is not easy to cause stress concentration. The formation of new bonds (C-Si bonds) at the interface of the modified resin indicates an enhancement of bonding strength at the interface, superimposing upon van der Waals forces, thereby enhancing the adhesive strength of the modified resin interface.
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Materials Today Chemistry
·
2024
·
IF 6.7
Ze-Yu Jiang,Mao-Jin Ran,Kai Liu,Yi-Fu Huang,Zhi-Rong Li,Ting-Ting Shen,Wan-Ying Li,Shokir Khojiev,Zhi-Yi Hu,Jing Liu,Li-Hua Chen,Yu Li,Bao-Lian Su
Constructing heterojunctions via in-situ growth or mechanical mixing have been widely used for improving the photogenerated carrier separation and photocatalytic activity . However, interface transfer impedance and the charge transfer channels of heterojunction prepared by in-situ method are rarely discussed. In this work, we use tubular g-C 3 N 4 (TCN) as the basic photocatalyst and in-situ growth of nickel/aluminum layered double hydroxide (LDH) nanosheets as co-catalyst on the surface of TCN (TCN@Ni/Al-LDH) to show the advantage of the in-situ constructing heterojunction for highly enhanced photocatalytic hydrogen production . The results show that the TCN@Ni/Al-LDH-60 exhibits the best hydrogen production performance of 1428 μmol h −1 g −1 , which is 53.3 and 21.33 times higher than that of TCN and mechanical prepared TCN/Ni/Al-LDH-60. For the first time, we propose a statistics model to reveal that the contact area of the heterojunction TCN@Ni/Al-LDH-60 is 2.88 times that of TCN/Ni/Al-LDH-60. This largely increases the charge transfer channels for the photogenerated carrier transport. In addition, the in-situ growth of TCN@Ni/Al-LDH composites increases the active sites, which improves the utilization efficiency of the photogenerated electrons. This study would shed some light on analyzing the in-situ constructing heterojunction photocatalysts for efficient photocatalytic hydrogen production through photocatalytic water splitting.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Xianqiang Chen,Haiming Qin,Ye Zhang,Jun Jiang,Yiquan Wu,Haochuan Jiang
Ce 3+ -doped Gd 3 (Al 1-x Ga x ) 5 O 12 (Ce:GAGG) transparent ceramics were successfully prepared via a solid state reaction/oxygen sintering method. The effects of Ga substitution on the structure and optical properties of the ceramics were investigated. The highest quantum yield and relatively high scintillation light yield were achieved in the Gd 3 (Al 0.6 Ga 0.4 ) 5 O 12 . The investigated processing technique demonstrated advantages such as increased flexibility and short processing time, thus being very cost effective. The investigated approach provides a much more economical alternative to the conventional melt growth processes used to fabricate single crystals.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Fuxin Liang,Yulin Wei,Yuhang Du,Fan Yang,Zhe Pang,Junyan Wu,Sai Huang,Honglei Wang,Qinggang Li,Chao Wu,Guopu Shi
This study investigated the catalytic hydrogenation of ethyl nicotinate using Pd/Al 2 O 3 -SiO 2 foam ceramic catalysts prepared via sol-gel impregnation (SI), sol-gel precipitation (SP), precipitation-impregnation (PI), and co-precipitation (CP). We aimed to evaluate the performance and stability of these catalysts as coatings on foam ceramic surfaces in a high-pressure hydrogen reactor at 403 K and 5 MPa. Various physicochemical characterization methods were employed to correlate catalytic performance with physicochemical properties. Results indicated that sol-gel prepared supports had higher specific surface areas, more acidic sites, and better metal-carrier interactions compared to the precipitation method. SEM analyses revealed flatter and smoother coatings from the sol-gel method, while TEM showed uniform Pd distribution with impregnation. Ultimately, the SI method provided the best catalytic performance with a conversion of 86.77 %. The conversion of the substrate remained above 80 % after five cycles.
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高影响因子
Materials Research Letters
·
2024
·
IF 8.6
Yang Zhao,Xiaobin Lin,Xudong Rong,Xiang Zhang,Dongdong Zhao,Chunnian He,Naiqin Zhao
Aluminum matrix composites (AMCs) reinforced with intragranular nano-sized Al2O3 were used as model material to investigate the effects of intragranular nano reinforcement on the mechanical properties at macro- and meso- levels. The results revealed that intragranular Al2O3 effectively facilitates the dislocation multiplication, which in turn enables the grain interior to endure high levels of plastic strain and consequently alleviates stress concentration at the grain boundary. Furthermore, intragranular Al2O3 leads to a collective enhancement in the intrinsic mechanical properties across domains of varying sizes, thereby contributing to the coordinated plastic deformation of heterogeneous grains, and enhancing the creep resistance of composite.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yiwei Sun,Xiaoli Wei,Fangcao Liu,Bing Liu,Jiaming Zhao,Yubao Bi,Wenfeng Han
Developing effective techniques to produce and stabilize highly active metastable F-Al-O species in HFCs dehydrofluorination system without being over-fluorinated to Al-F is a major challenge. Herein, we report a new strategy for the formation and stabilization of metastable species. Using NaH 2 PO 4 as a P source, phosphoric acid groups are modified to the surface of Al 2 O 3 leading to the fabrication of AlPO 4 /Al 2 O 3 interface. P and Al 2 O 3 bond to form Al-O-P structure at the interface and stabilize F-Al-O in the dehydrofluorination system. Further studies show that AlPO 4 /Al 2 O 3 interface increase the oxygen vacancy content of catalyst and accelerate the conversion of HFC-152a on the catalyst surface. Meanwhile, AlPO 4 /Al 2 O 3 interface improves the surface acidity of Al 2 O 3 , endue a large number of Lewis weak acid sites, reducing the carbon accumulation of catalyst, and improving the stability of catalyst. The activity test showed that AlPO 4 /Al 2 O 3 interface shows high catalytic performance (74.2 %) and excellent stability (50 h) for 1,1-difluoroethane dehydrogenation compared with Al 2 O 3 (30 % and low stability) without P modification.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Zhouxi Tan,Mingkang Zhang,Shuai Zhao,Yihua Huang,Zhengren Huang
Low strength and poor performance of SiC–WC composite for seals, attributable to the use of a large amount of liquid phase sintering additives, limit the application prospects of these materials. This study focuses on preparing high-strength, high-toughness, and wear-resistant SiC–WC composite using a small amount of aluminum and carbon black as sintering additives. The results revealed that the specimen containing 50 wt% WC exhibited the maximum flexural strength and fracture toughness of 645.9 MPa and 7.49 Mpa m 1/2 , respectively. These improvements were attributed to the deoxidizing and solid-solution effects of Al and the reinforcing effect of the WC second phase. Moreover, the specific wear rate was measured at 8.06 × 10 −7 mm 3 N −1 m −1 , which was 56.9 % lower than that of monolithic SiC. Results from Raman spectral analysis provided evidence of the presence of W–O bonds on the wear surface, indicating that the SiO 2 film could be successfully replaced by a WO 3 film.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 5
·4179-4189
·
IF 2.019
Han Xiaopeng,Huang Ying,Zhou Suhua,Sun Xu,Peng Xuanyi,Chen Xuefang
Due to the high agglomerate propensity of Si particles, making aluminum composites with a dispersion of the reinforcement using traditional way is still a challenge. In this study, an innovative approach was utilized to prevent the agglomeration of particles using encapsulating graphene sheets by grinding. Afterwards, the milled mixtures were incorporated with Cr-coated graphite flakes, urea and starch via mechanical mixing. After being mechanically mixed and sintered at 330 °C, the porous preform was fabricated by vacuum gas pressure infiltration. Effects of graphene content (0.5, 1, 3, 5 wt%) on the microstructures and properties of thermal and mechanical were investigated. Thermal conductivity and bending strength of the graphite flakes (G f )/Si/Al composites increased by 41.4 and 300%, respectively compared to the specimens without graphene. G f /Si/Al composites with graphene mass fraction of 5% had excellent in-plane thermal conductivity of 346 W/mK and bending strength of 84 Mpa, suggesting the composites can be applied as promising thermal management materials.
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