Journal of Cleaner Production
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2017
·
IF 5.715
Pengjun Li,Kairong Lin,Zhanqiang Fang,Kangming Wang
In this study, a novel bimetallic iron/nickel nanoparticles supported on biochar (BC@Fe/Ni) was established to degrade nitrate pollution in water. The nanocomposite was prepared from steel pickling waste liquor and sugarcane bagasse, which are made at low cost. The particle sizes of the nanocomposite ranged from about 10 nm to 20 nm and its specific surface area (59.83 m 2 /g) was about 71% bigger than that of nanoscale zero valent iron prepared from steel pickling waste liquor (S-NZVI), which proved that biochar had an excellent dispersal effect on bimetallic iron/nickel particles. Without controlling the pH, high nitrate removal rates over 93% could be realized in nitrate concentrations below 50 mg/L. The results of batch experiments demonstrated that the kinetics curves fitted the pseudo-first-order reaction well. And it was also found that higher dosages of the nanocomposite, lower initial nitrate concentrations, and acid medium facilitated nitrate degradation. In addition, the observed pseudo-first order rate coefficient in nitrate (20 mg/L) degradation rate by 4 g/L of the bimetallic iron/nickel supported on biochar was 30% faster than that by 2 g/L the bimetallic iron/nickel nanoparticles , due to the existence of biochar. And it was 75% faster than that by 2 g/L the nanoscale zero valent iron due to the existence of both biochar and the nanoscale zero valent nickel catalyst. Furthermore, iron and nickel ion pollution occurred in the denitrification system with bimetallic iron/nickel nanoparticles but not in that with the bimetallic iron/nickel nanoparticles supported on biochar, due to the biochar’s adsorption. After denitrification by the bimetallic iron/nickel nanoparticles supported on biochar, most of nitrate turned into ammonia (17.04 mg/L) and there only was a small amount of nitrite (0.024 mg/L) with high nitrate removal rate (99.5%). And most of ammonia can be absorbed by cation exchange resin with finial ammonia concentration of 0.58 mg/L. At last, the concentrations of nitrate (0.24 mg/L), nitrite (0.021 mg/L), and total nitrogen (0.84 mg/L) were lowest in the nanocomposite system. Overall, the bimetallic iron/nickel nanoparticles supported on biochar exhibited clear advantages over bimetallic iron/nickel nanoparticles and nanoscale zero valent iron with respect to degrading nitrate efficiently, preventing iron and nickel pollution and removing ammonia pollution in combination with cation exchange resin .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 8
·8169-8176
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IF 1.798
Jiang Yancheng,Xu Yunhua,Feng Guitao,Yao Hanchao
Ni–Co/ZrO 2 nanocomposite coatings were produced by high-frequency pulse electrodeposition in a modified Watt’s bath containing ZrO 2 particles. The surface morphology, microstructure, and high temperature oxidation resistance of the coatings were characterized by scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray diffraction, and isothermal oxidation tests. It was found that the presence of ZrO 2 particles resulted in changes in the morphology and structure of the coatings. The results also confirmed the nanostructure and uniform distribution of ZrO 2 particles of Ni–Co/ZrO 2 nanocomposite coatings. The addition of ZrO 2 did not change the preferred orientation (200), but remarkably affected the relative intensity of planes of Ni–Co alloy. The influence of duty cycle, average current density, and frequency on the amount of incorporated ZrO 2 particles in the Ni–Co/ZrO 2 nanocomposite has been also investigated. The Ni–Co/ZrO 2 nanocomposite coatings with highest ZrO 2 content (11.6 wt%) were prepared under the condition of duty cycle of 40 %, average current density of 5 A dm −2 , and frequency of 100 kHz. Moreover, the embedded ZrO 2 particles significantly improved the high temperature oxidation resistance of Ni–Co alloy coatings. The oxidation rate of Ni–Co/ZrO 2 nanocomposite coatings decreased with increasing the ZrO 2 content of the coatings.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2016
·
IF 0.566
Xiao-Ping WEI,Shun-Chao LIANG,Wen-Gang HUANG,Jian-Ping LI
A novel molecularly imprinted sensor based on photocurrent was fabricated to detect Ni 2+ . CdTe quantum dots (QDs) were selected as photoelectric material and modified on an indium-tin oxide (ITO) electrode, then the nickel-1-(2-pyridylazo)-2-naphthol molecularly imprinted film was formed on the QDs layer by photopolymerization. While 365 nm ultraviolet light was used as the excitation light, an electron-hole pair could be generated by the QDs. The electron receptor ascorbic acid would form a photocurrent under the excitation of the electron as detection signals. Ni 2+ was determined according to “gate-effect”. The complex was characterized by Fourier transform infrared spectrum and the CdTe QDs were characterized by ultraviolet absorption spectrum and fluorescence emission spectrum. The time for elution and rebinding, as well as the concentration of ascorbic acid, were also optimized. The experimental results indicated that there was a liner relationship between the photocurrent and the concentrations of Ni 2+ in the range of 5 × 10 −11 − 5 × 10 −8 M, with a detection limit of 8.31 × 10 −12 M. The sensor had good selectivity, and was applied in real water samples analysis.
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Progress in Natural Science-Materials International
·
2017
·
IF 2.038
Hongbin Dai,Yujie Zhong,Ping Wang
The synthesis of highly active and selective catalysts is the central issue in the development of hydrous hydrazine (N 2 H 4 ·H 2 O) as a viable hydrogen carrier. Herein, we report the synthesis of bimetallic Ni-Ir nanocatalyts supported on CeO 2 using a one-pot coprecipitation method. A combination of XRD, HRTEM and XPS analyses indicate that the Ni-Ir/CeO 2 catalyst is composed of tiny Ni-Ir alloy nanoparticles with an average size of around 4 nm and crystalline CeO 2 matrix. The Ni-Ir/CeO 2 catalyst exhibits high catalytic activity and excellent selectivity towards hydrogen generation from N 2 H 4 ·H 2 O at mild temperatures. Furthermore, in contrast to previously reported Ni-Pt catalysts, the Ni-Ir/CeO 2 catalyst shows an alleviated requirement on alkali promoter to achieve its optimal catalytic performance.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2016
·Vol. 20
·期 10
·2737-2747
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IF 2.327
Gao Minggang,Yang Liu,Dai Bin,Guo Xuhong,Liu Zhiyong,Peng Banghua
Efficient electrocatalysts for the oxygen evolution reaction (OER) are critical for various energy conversion devices such as metal-air batteries, rechargeable fuel cell, and water splitting for hydrogen production. In this work, a novel non-precious-metal OER catalyst was prepared from the pyrolysis of a Ni-Schiff base complex with thiourea. The derived catalyst is composed of nickel oxide coupled with nickel sulfide loaded on nitrogen-doped carbon matrix (NiO-NiS/N-C), which manifested excellent OER electrocatalytic activity, and an onset potential of 1.54 V vs reversible hydrogen electrode was achieved in alkaline electrolyte. The high performance of as-obtained electrocatalyst was illustrated by fully dispersed active components of NiO coupled with NiS nanoparticles, as well as the strong interaction between NiS, NiO particles, and N-doped carbon substrate. Our findings supply an easier path to fabricate the active catalyst through one-step metal organic framework transformation way and are promising for use in energy conversion systems and also yield new impetus for exploring other non-noble metal catalysts.
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MOLECULES
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2017
·Vol. 22
·期 1
·150
·
IF 2.861
Dongjun Lv,Mingjie Zhang
Two polymer catalysts (Pd-OCMCS and Ni-OCMCS) with good reusability were synthesized by coordinating Pd and Ni ontoO-carboxymethyl chitosan (OCMCS). The chemical structure and thermal stability of prepared catalysts were determined by Fourier transform infrared (FT-IR) spectra, Energy Dispersive Spectrometer (EDS)analysis, X-ray diffraction (XRD), and thermogravimetric analyzer (TG-DTG), and the analysis results showed that the Pd and Ni ions coordinated onto the OCMCS and formed a ligand with the –COOH group, amino groups, and –OH group on the OCMCS, and the EDS and Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) analysis results showed that the loading amounts of Pd and Ni were approximately 8.3% and 8.9%, respectively. In the Heck reaction between aryl halides andn-butyl acrylate catalyzed by the prepared catalyst, the test results showed that the product yield followed the order of aryl iodide > aryl bromide > aryl chloride. Additionally, the product yield for the aryl iodide and aryl bromide could reach up to 99% and 96%, respectively. Moreover, the electron-withdrawing and electron-donating property of the group on the aryl also affected the product yield, and the product yield for aryl halides with electron-withdrawing groupp-NO2,p-CH3CO, andp-CHO was higher than that with electron-donating groupp-CH3.Keywords:O-carboxymethyl chitosan;biopolymer-supported catalyst;Pd-OCMCS;Ni-OCMCS;heck reaction
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PubMed
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2017
·
IF 2.552
Yaping Lu,Lingxiang Gao,Lijuan Wang,Zunyuan Xie,Meixiang Gao,Weiqiang Zhang
BaTiO 3 (BT)/Ni composite particles were made by one-step method through agglomerating the metal Ni(0) nanoparticles reduced by a specific reducing agent (N 2 H 4 ·H 2 O) on the surface of BT sphere with diameter of ∼500 nm. The BT/Ni composite particles were characterized by the means of scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS). In BT/Ni particles, pure BT spherical particle was coated with Ni nanoparticles agglomerated on its surface. The average thickness of the Ni sheath was ∼30 nm and the content of Ni(0) and Ni (II) in the sheath were 70.2% and 29.8%, respectively. The responsive effects of BT/Ni particles filled in hydrogel elastomer were investigated by the viscoelastic properties. The results indicate that the BT/Ni particles exhibit electro and magneto coordinated responsive properties (E = 1 kV/mm, H = 0.1 T/mm), which is superior to BT particles with individual electro response.
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FUEL
·
2014
·
IF 3.406
Tingting Li,Junfeng Zhang,Xianmei Xie,Xuemei Yin,Xia An
Alkaline-promoted of NiAl–montmorillonite (NiAl–Mt) catalysts were prepared by ion-exchange method, tested in ethanol steam reforming (ESR) for hydrogen production, and characterized by a combination analysis of XRD, TPR, SEM, HR–TEM, EDS and N 2 adsorption–desorption. Characterization results indicated that the textural properties of the as-prepared catalysts are strongly dependent on the alkaline treatment. More importantly, a clear improvement on stability and catalytic activity, especially for the high selectivity to hydrogen, was observed in ESR. For NiAl–Mt/NaOH catalyst, ∼74.7% selectivity of hydrogen was kept at 773 K during 10-h test, while that of NiAl–hydrotalcite (NiAl) catalyst decreased from 20.4% to 5.3% within 10 h, and the selectivity of hydrogen on NiAl–Mt was ∼55.1%, accompanying with byproducts of acetaldehyde and ethylene. The improved activity and stability were attributed to the neutralization of acid sites by alkaline treatment, which accelerated the dehydrogenation and suppressed the dehydration of ethanol.
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Journal of Materials Chemistry A
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2013
·Vol. 1
·期 41
·12885-12892
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IF 0
Lian-Kui Wu,Ji-Ming Hu,Jian-Qing Zhang,Chu-Nan Cao
We report a novel silica co-electrodeposition route to prepare highly active nickel films. Firstly, Ni–SiO2 composite film was fabricated on a stainless steel substrate by electrodeposition, and then the SiO2 template was removed in alkaline electrolyte by consecutive cyclic voltammetry scans, leading to the formation of a porous Ni (po-Ni) matrix. The structure and morphology of the obtained films were characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The highly porous property of the po-Ni matrix is believed to be quite favourable for electrochemical applications. The electrochemical properties of the po-Ni film were evaluated by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and steady-state polarization curves. The results showed that the porous Ni derived from the Ni–SiO2 composite film exhibits good electrochemical performance for potential use as a supercapacitor material and catalyst for water splitting.
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Catalysis Science & Technology
·
2017
·Vol. 7
·期 13
·2813-2818
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IF 5.773
Yaping Lin,Yifeng Zhu,Xiulian Pan,Xinhe Bao
We demonstrate that the methanation activity of Ni catalysts is modulated by the crystal phase of the TiO2 support. The rutile TiO2 (r-TiO2)-supported Ni catalyst gives a turnover frequency almost two orders of magnitude higher than the anatase TiO2 (a-TiO2)-supported catalyst although the two catalysts exhibit a similar mean Ni particle size. Characterization by H2-TPR, H2-TPD, XPS and IR reveals a stronger interaction between Ni and r-TiO2, leading to a higher capability of CO activation and hydrogenation activity of Ni although Ni is partially covered by TiOx overlayers during reaction. Interestingly, the modulating effects of the titania crystal phases are much more pronounced on the activity of Ni in CO2 methanation.
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CHINESE JOURNAL OF CHEMISTRY
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2016
·Vol. 35
·期 5
·651-658
·
IF 1.872
Hao Tian,Xinyu Li,Sai Chen,Liang Zeng,Jinlong Gong
Reducible oxides ( e.g ., CeO 2 and ZrO 2 ) supported 3d transition metals ( e.g ., Ni, Co, Pt) exhibit remarkable catalytic activity in reactions that involve water activation, such as steam reforming and water gas shift. This paper describes the influence of Sn addition on the performance of Ni/CeO 2 catalysts in ethanol steam reforming. 0.25 wt% Sn addition improved the stability of Ni/CeO 2 by forming Ni-Sn bimetallic nanoparticles with Sn enriched surfaces to suppress the carbon deposition. Ni 0. 25 Sn/CeO 2 kept over 90% ethanol conversion in a 20 h stability test at 600 °C with over 60% hydrogen selectivity under a gas hourly space velocity of 57000 mL/(g•h). However, the presence of Sn decreased the overall oxygen storage capacity and oxygen mobility of NiSn/CeO 2 , which hampered water activation process and coke elimination occurring at the interface between Ni and CeO 2 . Additionally, ethanol decomposition was also suppressed due to the coverage of Sn atoms on Ni surfaces.
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ACS Catalysis
·
2025
·
IF 13.1
Jia-qi Bai,Mei Ma,Huangfei Liu,Zhangkai Qian,Durui Liu,Yuncai Zhao,Yijing Gao,Jingshuai Chen,Mengdie Cai,Song Sun
The hydrogenation of nitriles is an environmentally friendly and atom-economical route to prepare high-value amines; however, it is still a challenge to control selectivity because of the occurrence of hydrogenation, self-coupling, and hydrogenolysis reactions during the hydrogenation process. It is highly desirable to develop efficient non-noble-metal catalysts for the hydrogenation of nitriles to secondary amines, although several noble metal catalysts have been reported. Herein, we successfully prepared a Cu–Ni/W20O58 catalyst and found that the Cu4.4–Ni0.6/W20O58 catalyst showed a 92.3% yield with initial TOFs of 270.0 h–1 at 373 K and 3 MPa H2 for the hydrogenation of benzonitrile (BN) to dibenzylamine (DBA), which was much superior to that of the monometallic Cu4.4/W20O58 and Ni0.6/W20O58 catalysts. Moreover, the Cu4.4–Ni0.6/W20O58 catalyst could be reused at least 4 times and was effective for the hydrogenation of various nitriles with superior selectivity to secondary amines. Furthermore, the reaction mechanism of BN hydrogenation for the Cu–Ni alloy of Cu4.4–Ni0.6/W20O58 was proposed on the basis of spectroscopic studies such as XRD, TPR, TEM, XAFS, and XPS, kinetic studies such as the effect of BN concentration and H2 pressure, the isotopic effect of hydrogen, and the effect of the reaction temperature and DFT calculations. The rate-determining step was the hydrogenation of benzylidenamine (BI) to the half-hydrogenated intermediate by one H atom over the Cu4.4–Ni0.6/W20O58 catalyst. The Ni–W20O58 interface was responsible for the adsorption and activation of BN, and the electron-rich Cu acted as the site for H2 dissociation; the synergistic effect of Cu and Ni led to the superior catalytic performance of the Cu4.4–Ni0.6/W20O58 catalyst.
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