CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Junmei Liang,Tao Chen,Jiapeng Liu,Qicheng Zhang,WenChao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Chemoselective hydrodeoxygenation (HDO) of lipids to diesel-like hydrocarbons is important for biomass to biofuel conversion. Here we design a new Ni-based catalyst (Ni/MoO 2 @Mo 2 CT x ) with extraordinary catalytic performance in the HDO of palmitic acid. To relieve the loss of C atom for Ni-based catalyst, partial oxidation of Mo 2 CT x MXene was used as a novel support. As a result, the catalytic activity and selectivity ratio of hexadecane/pentadecane (C 16 /C 15 ) were enhanced over Ni/MoO 2 @Mo 2 CT x catalyst, and the major product of palmitic acid HDO is C 16 , demonstrating a high C atom economy. This facilitated catalytic performance may be ascribed to the synergic effect of metal Ni, Mo 2 CT x MXene as well as MoO 2 active sites. The palmitic acid (–COOH) can convert into hexadecanal (–CHO) and hexadecanol (–CH 2 OH) over Ni/MoO 2 @Mo 2 CT x catalyst in the initial stage. The metal Ni further contributes to the hydrogenation of the hexadecanal to C 15 with the cleavage of C–C bonds by decarbonylation (DCO) route. MoO 2 nanoparticles obtained from Mo 2 CT x oxidation accelerate the scission of C–O bonds of the hexadecanol to improve the selectivity of C 16 by hydrogenation-dehydration route.
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高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Xinying Zhang,Chang Su,Xiaoyan Liu,Zhenguo Liu,Xia Liang,Yanming Zhang,Yuwei Feng
The aim of this study was to investigate whether the plant-growth-promoting rhizobacteria (PGPR) could enhance phytoremediation efficiency of Scirpus triqueter ( S.triqueter ) in the pyrene-Ni co-contaminated soil. We also expected to reveal the possible mechanism for the affected phytoremediation efficiency induced by PGPR. We used three kinds of contaminated soils (Ni-contaminated soil, pyrene-contaminated soil and pyrene-Ni co-contaminated soil) to conduct this pot study. After harvest, plants growth indicators, polyphenol oxidase (PPO) activity and soil microbial community structure of each treatment were investigated to explain the different dissipation rates of pyrene and removal rates of Ni between treatments with and without PGPR. The results showed that PGPR-inoculated S. triqueter increased dissipation rates of pyrene and removal rates of Ni in all three contaminated soils, among which Ni removal rates in Ni single contaminated soil was elevated most significantly, from 0.895‰ to 8.8‰, increasing nearly 9 folds. However, Ni removal rate efficiency in co-contaminated soil was weakened because more toxic and complicated co-contaminated soil restrained plant growth and Ni absorption. We also observed that co-contamination harmed the soil microbial community more severely than that in single pyrene or Ni contaminated soil through phospholipid fatty acids analysis. Furthermore, dissipation rates of pyrene and removal rates of Ni were found positively correlated to the PPO activity and the abundance of branched and saturated fatty acids reflected by Pearson correlation analysis.
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高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 9
·2813-2823
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IF 2.936
Yang Jian,Li Xuemei,Zhang Jia,Tian Junying,Yao Xiaolan,Liu Hailong,Xia Chungu,Huang Zhiwei
Valuable 5-amino-1-pentanol (5-AP) was efficiently synthesized from biomass-derived dihydropyran over hydroxylapatite nanorod supported Ni catalysts (Ni-HAP), by coupling the in situ generation of 5-hydroxypentanal (5-HP, via the ring-opening tautomerization of 2-hydroxytetrahydropyran (2-HTHP)) and its subsequent reductive amination. The Ni-HAP catalyst with 10 wt% Ni loading exhibited the highest 5-AP yield than the other Ni-HAP catalysts with different Ni loadings and several commercial hydrogenation catalysts, including Ru/C, Pt/C and Pd/C, as well as Raney Ni. High Ni particles dispersion, high reducibility and acidic intensity were found to account for the superior catalytic performance of 10Ni-HAP. The effect of reaction parameters on the catalytic performance was investigated, and an excellent 5-AP yield of 92% was achieved under mild reaction conditions of 80 °C and 2 MPa H 2 . The stability of the Ni-HAP catalyst was studied using a continuous flow reactor, and the sintering of Ni nanoparticles was considered as the major reason for the decline in hydrogenation activity. Graphical Abstract The Ni-HAP catalyst exhibited high catalytic performance to synthesis 5-AP due to the high Ni particles dispersion, reducibility and acidic intensity.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Jing-Yu Li,Ming-Yu Qi,Yi-Jun Xu
Integrating selective organic synthesis with hydrogen (H 2 ) evolution in one photocatalytic redox reaction system sheds light on the underlying approach for concurrent employment of photogenerated electrons and holes towards efficient production of solar fuels and chemicals. In this work, a facile one-pot oil bath method has been proposed to fabricate a noble metal-free ultrathin Ni-doped ZnIn 2 S 4 (ZIS/Ni) composite nanosheet for effective solar-driven selective dehydrocoupling of benzyl alcohol into value-added C–C coupled hydrobenzoin and H 2 fuel, which exhibits higher performance than pure ZIS nanosheet. The remarkably improved photoredox activity of ZIS/Ni is mainly attributed to the optimized electron structure featuring narrower band gap and suitable energy band position, which facilitates the ability of light harvesting and photoexcited charge carrier separation and transfer. Furthermore, it has been demonstrated that it is feasible to employ ZIS/Ni for various aromatic alcohols dehydrocoupling to the corresponding C–C coupled products. It is expected that this work can stimulate further interest on the establishment of innovative photocatalytic redox platform coupling clean solar fuels synthesis and selective organic conversion in a sustainable manner.
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European Physical Journal Plus
·
2026
·Vol. 141
·期 9
·1057
·
IF 2.9
Yan Xiang,Fan Hui,Li YuHang
To further enhance the mechanical properties of metal surfaces, Ni–Co–TiC nanocomposite coatings were successfully fabricated on 304 stainless steel substrates utilizing a custom-built jet electrodeposition system. This study systematically investigated the effects of cathodic current density and TiC particle concentration in the electrolyte on the growth kinetics, microstructural morphology, phase composition, crystallite size, microhardness, and tribological properties of the composite coatings. The results indicate that as current density and TiC particle concentration increase, the mass deposition rate, compactness, and mechanical properties of the coatings initially improve before subsequently declining. Under the optimal processing parameters (a current density of 70 A/dm 2 and a TiC particle concentration of 10 g/L), the high-velocity impingement of the jet flow and the electric field force achieved an optimal synergy. This effectively suppressed nanoparticle agglomeration and facilitated the uniform dispersion of TiC within the Ni–Co matrix. X-ray diffraction analysis verifies that the Ni–Co matrix retains a face-centered cubic solid solution structure, and the average crystallite size is refined to 15.2 nm under the optimized condition. Driven by the combined mechanisms of grain refinement and Orowan dispersion strengthening, the optimized coating reaches a peak microhardness of 654.24 HV and reduces the average friction coefficient to 0.265, achieving a favorable balance between mechanical strength and tribological performance. This study elucidates the regulatory mechanisms of jet electrodeposition parameters on the microstructural and macroscopic properties of composite coatings, providing a crucial theoretical basis for the engineering fabrication of high-performance, wear-resistant composite coatings.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Kefan Shi,Zemin Sun,Mengwei Yuan,Yuelin Zhao,Genban Sun
Because of their special features, NiFe-LDHs (nickel iron layered double hydroxides) are prospective OER (oxygen evolution reaction) catalysts that might be utilized to catalyse the electrolysis of water and produce hydrogen to address the energy crisis. In this work, the electronic structure and electrocatalytic performance of the NiFe-LDH were accurately regulated by optimizing the Ni sites, which was enabled by adjacent metal sites coordinated with the “polyoxometalate electron sponge”. With extension of the modification time, the Ni 2p binding energy, the Ni 3+ /Ni 2+ ratio and the OER properties were gradually tuned, which indicated accurate regulation of active Ni sites by the “polyoxometalate electron sponge” on a temporal scale. Additionally, NiFe-LDH-PW 12 -12 h (NiFe-LDH modified by polyoxometalate anions for 12 h) showed the highest OER performance along with fast electron transfer, superior reaction kinetics and electrochemical durability, with an overpotential ∼68 mV lower than that of NiFe-LDH. This work provides an accurate strategy for regulating the electronic structures of active metal sites for the OER.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Qinglin Sheng,Duo Liu,Jianbin Zheng
In this paper, a sensitive novel non-enzymatic nitrite electrochemical sensor based on Pt nanoparticles loaded Ni(OH) 2 /Multi-Walled Carbon Nanotubes nanocomposites (Pt/Ni(OH) 2 /MWCNTs) was described. The composition and morphology of the Pt/Ni(OH) 2 /MWCNTs were characterized by transmission electron microscope and investigated energy dispersive X-ray spectra respectively. Results showed that the Pt nanoparticles could be anchored on the surface of the Ni(OH) 2 /MWCNTs uniformly through a simple reduction process. The electrochemical investigation of the sensor revealed that the Pt/Ni(OH) 2 /MWCNTs exhibited remarkable electrocatalytic performance toward nitrite oxidation , with a sensitivity of 145 μA mM − 1 cm − 2 and a low detection limit of 0.13 mM. Moreover, the obtained Pt/Ni(OH) 2 /MWCNTs modified GCE with excellent reproducibility and selectivity also allows for practical application. It is expected that the combination of noble metal with Ni(OH) 2 /MWCNTs could be expanded to enhance the catalytic performances of nanocomposites and used for the construction of high-sensitive electrochemical sensors.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yanlin Xu,Yacong Deng,Bin Liu,Zhuoyi Liu,Wenhong Wang,Yuan Pan,Bin Dong,Yichuan Li,Changlong Yin,Hailing Guo,Yongming Chai,Chenguang Liu
Due to the mass manufacturing of global papermaking black liquor, lignin remained in strong-alkaline black liquor is a promising raw material for bulk hydrocarbons production with huge carbon–neutral value. In this work, the alkaline in reactant is proved to inhibit the hydrodeoxygenation reaction of guaiacol severely due to the formation of phenates and cyclohexadienones. A hydroxyl interventional Ni/AC catalyst, on which an “acid-switch” is built with combination of hydroxyl groups and Ni nanoparticles, achieves 4-fold bio-hydrocarbons yield in alkaline condition compared to conventional Ni/AC catalyst. It is implied that hydroxy groups promote the C (sp2) -O reaction route with the aid of activated hydrogen on Ni nanoparticles, while acidic groups on catalyst reduce the size of Ni nanoparticles, thus further enhances the HDO efficiency. It is the first time we propose a reaction mechanism of HDO of guaiacol on Ni-based catalyst in alkaline condition to give insight into HDO reaction of lignin compounds in black liquor. This work gives insights into the relationship between catalyst surface properties and HDO efficiency, and provides a promising approach for green utilization of lignin in alkaline black liquor.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 48
·18342-18353
·
IF 4
Minghao Dou,Mengjie Yao,Kai Ding,Yuye Cheng,Hongyu Shao,Shenjie Li,Yanyan Chen
Heterostructures formed by combining semiconductor materials with different band structures can provide work functions, d-band positions and electronic properties different from bulk materials and are considered as an effective strategy to improve the catalytic activity through electronic modification. In this study, an efficient MoS2/Fe-Ni3S2/NF heterojunction material was prepared by a two-step hydrothermal method. With the help of flake Ni(OH)2 synthesized in the first step, growth sites were provided for flake Ni3S2. The electronic structure of Ni3S2 was optimized by Fe doping, while the construction of the MoS2/Fe-Ni3S2 heterostructure allowed the catalyst to expose more active sites. MoS2/Fe-Ni3S2/NF exhibited a small charge transfer resistance and excellent electrocatalytic performance. At a current density of 10 mA cm−2, only low overpotentials of 148 mV and 118 mV were required for the oxygen precipitation reaction (OER) and hydrogen precipitation reaction (HER), respectively. Notably, when MoS2/Fe-Ni3S2/NF is used as the anode and cathode for overall hydrolysis, only 1.51 V is required to reach a current density of 10 mA cm−2, demonstrating its great potential for application in hydrolysis. This work provides a feasible idea for the rational construction of non-precious metal bifunctional electrocatalysts with excellent performance.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Shuanghui Zeng,Xue Wang,Yunqian Zhang,Jiaojing Shao,Zhao Ding,Jie Zhao
A free-standing 3D core/shell composite material CNTs@Co 9 S 8 on nickel mesh has been prepared by a simple two-step method. Carbon nanotubes (CNTs) grown vertically on the surface of nickel mesh by chemical vapor deposition (CVD) method act as conductive skeleton. Then Co 9 S 8 nanosheets uniformly aligned on the surface of the CNTs by solvothermal method are interconnected to form a honeycomb structure . Owing to the close contact of the CNTs@Co 9 S 8 hybrid with the nickel mesh and the hierarchical 3D porous structure , the prepared Ni@CNTs@Co 9 S 8 electrodes exhibit low resistance and excellent charge storage capability with a specific capacitance of 1305.4 F g −1 at 1 A g −1 . The composite delivers an excellent rate capability with 84.3 % capacitance retention at 10 A g −1 . An asymmetric supercapacitor composed of Ni@CNTs@Co 9 S 8 and nitrogen-doped carbon nanotubes (NCNTs) shows an energy density of 23.8 Wh kg −1 and a high power density of 8007.4 W kg −1 . The specific capacitance of the ASC device remained 87.31 % after 10,000 charge-discharge cycles and two tandem ASCs can power two red LED diodes for at least 7 min, suggesting the potential application of the obtained free-standing electrode for supercapacitors .
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 48
·22269-22275
·
IF 3.3
Zilin Fan,Qimeng Ran,Xiaoling Xu,Yin Tang,Xiaobo Liu,Kun Jia
The design of organic precursors with optimized molecular structures is of great importance for improving the fluorescent properties and sensing applications of heteroatom-doped carbon nanodots (CDs). Herein, we designed and synthesized a phthalonitrile derivative containing both melamine and benzoxazine moieties, which has been, for the first time, employed as a cross-linkable precursor to prepare nitrogen-doped carbon nanodots (N-CDs), showing fluorescence emission with a large Stokes shift. As a result of the good affinity between the surface functional groups of N-CD and Ni ions proven by XPS and FTIR techniques, the fluorescence emission of optimized N-CDs can be selectively quenched by Ni ions among other metal ions. Furthermore, the synthesized N-CDs are employed as fluorescent probes for the quantitative detection of Ni ions with a wide concentration range and a high sensitivity (the limit of detection approaching 1.58 nM). Overall, the current work reveals a new possibility for expanding the synthesis route and metal ion sensing of nitrogen-doped CDs.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Zhi Shen,Qi-yang Li,Shu-kui Shi,Guo Zang,Wen-jun Lv,Qiang Zhao
In order to further enrich the research on the synthesis of complexes with multi carboxyl ligands and transition metals. In this study, [1,1′-biphenyl]-2,4′-dicarboxylic acid ligand (H 2 bpda), 2,2′-dipyridyl (2,2′-dipy) and 4,4′-dipyridyl (4,4′-dipy) were used to construct metal complexes with Zn 2+ , Mn 2+ , Co 2+ and Ni 2+ by solvothermal reaction, and seven complexes were constructed, namely, [Zn(Hbpda) 2 (4,4′-dipy) 2 ] ( 1 ), [Mn(Hbpda) 2 (4,4′-dipy) 2 •(4,4′-dipy)] n ( 2 ), [Co(Hbpda) 2 (4,4′-dipy) 2 ] ( 3 ), [Ni(bpda)(4,4′-dipy) 1.5 •4H 2 O] n ( 4 ), [Mn(bpda)(2,2′-dipy)] n ( 5 ), [Co(bpda)(2,2′-dipy) •2H 2 O] n ( 6 ) and [Ni(bpda)(2,2′-dipy) •2H 2 O] n ( 7 ); Single crystal x-ray diffraction analyses reveal that complexes 1 and 3 have zero-dimensional mononuclear structure, 2, 4 and 5 have one-dimensional chain structure, 6 and 7 have two-dimensional network structure. Furthermore, solid state fluorescence properties of complexes 1–7 and magnetic properties of complexes 2, 3, 4, 5, 6 and 7 were investigated. The fluorescent test results show that complex 1 has excellent fluorescence performance and the fluorescence intensity is higher than that of ligand; The magnetic results indicate that complexes 2, 4 and 7 have ferromagentic property and complexes 3, 5 and 6 have antiferromagentic property.
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