Journal of Environmental Chemical Engineering
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2019
·
IF 0
Fujin Sun,Qihui Zeng,Wen Tian,Yingming Zhu,Wei Jiang
Silver oxide is a high-performance visible-light-driven nanoparticle photocatalyst. However, its high cost and difficult recovery limit its wide application. Constructing a magnetic composite is a smart strategy to effectively utilize nanoparticle photocatalysts with acceptable performance maintenance. In this study, three magnetic ferrite supports, that is, CoFe 2 O 4 , ZnFe 2 O 4 , and NiFe 2 O 4 , were used as support to load Ag 2 O and construct Ag 2 O/MFe 2 O 4 composites to lower the Ag consumption and intensify the recovery rate. The photoactivity, stability, and magnetic recovery of the three composite magnetic photocatalysts were evaluated by using four typical organics. The results of the batch experiment confirm that Ag 2 O/MFe 2 O 4 (60%) possesses a good photoactivity and stability. However, Ag 2 O/ZnFe 2 O 4 exhibits a better photoactivity and higher magnetic recovery based on cycling during the semi-continuous process. The ferrites are inert for photocatalysis process without significant effect on Ag 2 O photocatalytic performance, but increase the surface area and improve the recovery rate as magnetic composite carriers.
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APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Wenning Yang,Jia Li,Min Liu,Dickon H.L. Ng,Yong Liu,Xiaofan Sun,Jie Yang
Novel hierarchically porous CoAl-LDH (layered double hydroxides)/MFe 2 O 4 (Ni, Zn, Co) hybrids with excellent peroxidase-like catalytic activity , high selectivity and reusability were first fabricated by using natural cotton as a bio-template. Among them, CoAl-LDH/NiFe 2 O 4 exhibited the best intrinsic peroxidase-like property due to its 3D hierarchically porous structure with more exposed active sites, which could effectively catalyze peroxidase substrate 3,3′,5,5′- tetramethylbenzidine (TMB) in the presence of H 2 O 2 to produce typical blue color reaction. A facile and visual system for glucose detection using glucose oxidase was successfully established, which exhibited a sensitive response to glucose in the range of 25–400 μM with detection limit of 13 μM based on the hydroxyl radical originated from the decomposition of H 2 O 2 by the catalysis of CoAl-LDH/MFe 2 O 4 (Ni, Co, Zn) hybrids. This work offered an effective strategy to achieve morphology-controllable hierarchically porous materials and provided a new insight into seeking novel enzyme mimetics with enhanced catalytic activities.
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高影响因子
Catalysts
·
2019
·Vol. 9
·期 6
·538
·
IF 3.444
Lili Liu,Xiaojing Zhou,Li Liu,Shuai Jiang,Yingjie Li,Luxia Guo,Shijuan Yan,Xishi Tai
Three bimetallic Cu–Ni nanoparticle-supported catalysts were synthesized by co-immobilization followed by H2reduction. A chromium(III) terephthalate metal organic framework (MIL-101), titanium dioxide (TiO2), and carbon (C) with different properties (acidity and Brunauer–Emmett–Teller surface area) were selected as supports for studying the effect of the support nature on the catalytic activity and selectivity in the oxidation of benzyl alcohol. The physicochemical properties of the Cu–Ni-supported catalysts were characterized by XRD, NH3-TPD, nitrogen adsorption/desorption, TEM, EDS, XPS, and ICP-OES. Bimetallic Cu–Ni nanoparticles were highly dispersed on the support. The catalytic activities of CuNi/MIL-101, CuNi/TiO2, and CuNi/C were tested in the selective oxidation of benzyl alcohol to benzaldehyde in the presence of molecular oxygen under mild reaction conditions. The highest benzaldehyde yields were achieved with CuNi/TiO2, CuNi/MIL-101, and CuNi/C catalysts at 100 °C within 4 h under 5, 3, and 3 bar of O2, respectively. The bimetallic Cu–Ni-supported catalysts possessed two types of catalytic active sites: acid sites and bimetallic Cu–Ni nanoparticles. The CuNi/MIL-101 catalyst possessed a high number of acid sites and exhibited high yield during selective benzyl alcohol oxidation to benzaldehyde. Importantly, the catalysts exhibited a high functional group (electron-donating and electron-withdrawing groups) tolerance. Cu–Ni-supported catalysts with an Cu:Ni mole ratio of 1:1 exhibited the highest yield of 47% for the selective oxidation of benzyl alcohol to benzaldehyde. Reusability and leaching experiment results exhibited that CuNi/MIL-101 showed better stability than CuNi/TiO2and CuNi/C catalysts due to the large porous cavities of MIL-101 support; these cavities can be used to trap bimetallic Cu–Ni nanoparticles and inhibit nanoparticle leaching.Keywords:Cu–Ni nanoparticles;MIL-101;TiO2;carbon;benzyl alcohol oxidation
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高影响因子
Nano Research
·
2019
·Vol. 12
·期 4
·869-875
·
IF 8.515
Long Yan,Li Jian,Wu Lanlan,Wang Qishun,Liu Yu,Wang Xiao,Song Shuyan,Zhang Hongjie
The Pt-Ni nanoframe catalysts have attracted great interest owing to their unique electronic structure and excellent catalytic performance. However, the stability of the tenuous edges of nanoframe-structures is dissatisfactory and their universal applications in catalytic market beyond electrocatalytic reactions are yet to be tapped and explored. Herein, we developed a new core@shell structured Pt-Ni nanoframe@CeO 2 (Pt-Ni NF@CeO 2 ) composite via etching the Ni from inhomogeneous Pt-Ni rhombic dodecahedra (Pt-Ni RD) by cerium(III) acetate hydrate (Ce(OAc) 3 ). In this path, Pt-Ni RD was used as self-sacrificial template, while the Ce(OAc) 3 serves as the provider of the Ce 3+ source and OH − for the formation of CeO 2 shell, etchant of Pt-Ni RD, and the surface modification agent. By this way, the etching of Pt-Ni RD and the formation of the CeO 2 shell are simultaneously proceeded to form the final Pt-Ni NF@CeO 2 in one step. The obtained Pt-Ni NF@CeO 2 exhibits strong interfacial charge transfer interaction between Pt-Ni NF core and CeO 2 shell even without reduction treatment, leading to enhanced catalytic activity in the hydrogenation of phenylacetylene. After introduction of trace silver, the Pt-Ni-Ag 4.9 NF@CeO 2 achieves remarkable catalytic performance for the selective conversion of phenylacetylene to styrene: high conversion (100%), styrene selectivity (86.5%), and good stability. It reveals that encapsulation noble metal nanoframes into metal oxide to form core@shell structured hybrids will indeed enhance their stability and catalytic properties. Particularly, this work expends the application of noble metal nanoframes materials to hydrogenation reactions.
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Micro & Nano Letters
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2019
·Vol. 14
·期 7
·749-752
·
IF 0.975
Li Hong Qian,Xiao Cai Liang,Hua lan Zhou
The Ni(OH) 2 /NiOOH nanoparticles (NPs) electrodeposited on a glassy carbon electrode (GCE) in Ni(NO 3 ) 2 and NH 3 ·H 2 O aqueous solution for the electrode materials. Then the nickel hydroxide/oxyhydroxide acetate was formed in acetate solution. The effects of deposition conditions such as the concentration of Ni(NO 3 ) 2 solution, the number of sedimentary cycles, the concentration of acetate in the soaking liquid and the soaking time are discussed in detail. The electrochemical properties of the material have been investigated by cyclic voltammetry, Tafel curve, EIS and amperometric i–t curve techniques. The result displays excellent electrocatalytic activity towards the electrocatalytic oxidation of urea in alkaline solution. Furthermore, the modified electrode for oxidation reaction has the advantages of simple preparation, good electrochemical properties and stabilisation.
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高影响因子
Results in Physics
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2019
·
IF 3.042
Baosong Li,Dandan Li,Tianyong Mei,Weiwei Zhang
Ni-W/ZrO 2 -CeO 2 composite coating has been fabricated via pulse electrodeposition. The structure, morphology, composition and the operating parameters of the nanocomposite coating were evaluated and optimized for the enhanced hardness and corrosion resistance. It illustrated that the deposited coatings are dense, crack-free with nodular or granular structure. The average current density of 4–6 A dm −2 , duty cycle of 70% is beneficial to the finer structure and higher content of nanoparticles in deposits. The average roughness, crystallite size and growth rate of the composite coating was examined. The hardness as a function of duty cycle, current density and deposition time were investigated. The optimal parameters for the improved performance of the composites were given. It was illustrated that the reinforcing particle phase had been uniformly co-deposited in the coating. The embedded ZrO 2 and CeO 2 particles could enhance the corrosion resistance and hardness of Ni-W metallic matrix. Ni-W/ZrO 2 -CeO 2 nanocomposite coatings possess higher performance in aggressive environment and exhibit great application values.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Guoliang Li,Xiaobing Zhang,Jianqiang Sun,Anping Zhang,Chunyang Liao
A novel unique adsorbent (Fe 3 O 4 @Co/Ni-LDH) has been successfully synthesized and applied for removal of bisphenols (BPs) from aqueous solution. The prepared adsorbent was characterized to appear in a hierarchical rattle-like structure, and possesses high specific surface area, abundant pore system, and magnetic properties. Adsorption kinetics fitted well with the pseudo-second-order model. Adsorption isotherms abide by the Langmuir model, and the maximum adsorption capacity for bisphenol A (BPA), F (BPF), AF (BPAF) and S (BPS) on Fe 3 O 4 @Co/Ni-LDH at pH of 7.0 were 238.96, 177.09, 320.56 and 345.84 mg/g, respectively. Moreover, it was found that the high pH and NaCl concentration were not conducive to the removal of BPs. The humic acid and real waters had no significant effects on the removal of BPs on Fe 3 O 4 @Co/Ni-LDH. Furthermore, the FT-IR spectra indicated that the removal of four BPs were primarily Hydrogen bond interaction between BPs and Fe 3 O 4 @Co/Ni-LDH. The Fe 3 O 4 @Co/Ni-LDH was regenerated effectively by methanol and can be repeatedly used. This novel Fe 3 O 4 @Co/Ni-LDH can be applied as a promising adsorbent for removal of BPs from aqueous matrices.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 14
·13360-13371
·
IF 2.195
Li Yingli,Shan Lina,Sui Yanwei,Qi Jiqiu,Wei Fuxiang,He Yezeng,Meng Qingkun,Ren Yaojian,Liu Jinlong
Adopting of hydroxides alone as electrode materials exhibit moderate performance due to its poor cycle stability and conductivity. In this study, an ultrathin nanostructure composed of nickel–cobalt layered double hydroxide (Ni–Co LDH) grown on carbon fiber cloth (CFC) has been prepared via a simple and efficient electrodeposition (ED) method without any binder or conductive agent, demonstrating an excellent cycle performance of Ni–Co LDH. The electrode delivers an extraordinary specific capacitance of 1540 F g −1 at a current density of 1 A g −1 , with excellent rate capability of 1284.5 F g −1 even at 15 A g −1 as well as a great cycling stability of specific capacitance remaining 82.9% after 5000 cycles at 10 A g −1 . Then, an asymmetric supercapacitor (ASC) device, with Ni–Co LDH as the positive electrode and rGO as the negative one, shows a perfect electrochemical performance. It is believed that in the future, this kind of electrode material will have a widespread application within the realm of electrochemical energy storage.
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Nanoscale
·
2019
·Vol. 11
·期 24
·11513-11520
·
IF 6.97
Huan-Feng Wang,Jun-Feng Li,Xue-Xi Sun,Ji-Jing Xu
The design of a nanoporous cathode for Li–O2 batteries that can achieve high chemical stability and superior electrochemical performance remains a formidable challenge. A novel approach for the fabrication of nanoengineered PdNi alloys directly coated onto Ni nonwoven fabric (PdNi/NiNF) obtained through electrospinning has been proposed. On the basis of the contributions of the porous structure, the prepared metal-based cathodes can exhibit high chemical and mechanical stabilities, high catalytic activity, and high conductivity. In this design, the major side reactions were excluded when compared with popularly used carbon cathodes, and excellent cycling stability (266 cycles) could be achieved. The proposed cathode exhibited a high discharge capacity of 15 700 mA h g−1 at 500 mA g−1, which was 5 times higher than those reported for carbon-free cathodes.
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PubMed
高影响因子
POWDER TECHNOLOGY
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2019
·
IF 3.413
Zhi-Bo Li,Guo-Hua Zhang,Kuo-Chih Chou
The ultrafine composite powders of two different compositions (90W-7Ni-3Fe and 93W-4.9Ni-2.1Fe, wt%) were synthesized by a two-stage reduction process consisting of carbothermic pre-reduction and the following deep reduction by hydrogen, and then the densification behaviors of them were investigated. The prepared W-Ni-Fe composite powders by the new proposed two-stage method had the particle size ranged from 200 nm to 400 nm. The sintered compacts of these two kinds of W-Ni-Fe powders achieved nearly full densification at a sintering temperature of 1400 °C within 3 h. The maximum hardness of the alloys obtained at 1300 °C were 411 HV and 358 HV, and the bending strength of >1500 MPa was achieved at 1400 °C for the compositions of 90W-7Ni-3Fe and 93W-4.9Ni-2.1Fe, respectively. Meanwhile, the bending fracture mechanism was also investigated, which was different for the samples sintered at different temperatures.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yuelong Xu,Ran Wang,Yuxuan Zheng,Lihui Zhang,Tifeng Jiao,Qiuming Peng,Zhenfa Liu
Because of their high catalytic activity and abundant resources, nonprecious transition metal phosphides are favorable substitutes for noble metals as hydrogen evolution reaction (HER) electrocatalysts. In this work, self-assembled Ni/Co phosphide composite N-doped carbon spheres were successfully prepared via a hydrothermal process, which had abundant exposed active sites for the HER. The as-obtained samples exhibited excellent electrocatalytic activity for the HER with an overpotential of only 160 mV (vs. RHE) at a current density of 10 mA cm −2 in a 0.5 M H 2 SO 4 solution and a comparatively low Tafel slope (57 mV dec −1 ). Additionally, the Ni 2 P/CoP spheres also show good stability after 120 h and 5000 cycles of a cyclic voltammetry test. Their highly efficient catalytic activity for the HER is attributed to the specific spherical structure, which provides exposed Ni 2 P and CoP for favorable adsorption and desorption of hydrogen. Therefore, nonprecious transition metal phosphide spheres may provide a promising strategy to improve the catalytic activity of HER electrocatalysts.
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高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 3
·606-613
·
IF 9.405
Zhenbing Xie,Bingfeng Chen,Haoran Wu,Mingyang Liu,Huizhen Liu,Jianling Zhang,Guanying Yang,Buxing Han
Transformation of biomass or biomass-based feedstocks into fuels or valuable chemicals is of great importance for the sustainable development of our society. Mesoporous Al2O3–ZrO2 with different Al : Zr molar ratios was prepared by the sol–gel method, and Cu–Ni/Al2O3–ZrO2 catalysts were fabricated by the impregnation method. The catalytic performances of the bifunctional catalysts were studied in the selective hydrogenation of levulinic acid (LA) into 2-methyltetrahydrofuran (MTHF). It was demonstrated that both Cu : Ni and Al : Zr ratios affected the selectivity to MTHF significantly. The bimetallic catalysts Cu–Ni/Al2O3–ZrO2 containing 10 wt% Ni and 10 wt% Cu gave 99.8% MTHF selectivity at full conversion of LA when the Al : Zr ratio was 9 : 1. The outstanding catalytic performance of the catalyst is related to the mesoporous structure, the acidic properties of the support and the synergistic effect between Cu and Ni. The catalyst could be reused five times without a considerable loss of catalytic activity and selectivity.
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高影响因子
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