FOOD CHEMISTRY
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2019
·
IF 5.399
Juan Han,Li Wang,Lei Wang,Chunmei Li,Yanli Mao,Yun Wang
Bromelain is an important industrial proteolytic enzyme which has great commercial value and is of wide application in food, beverage, tenderization, cosmetic, textile and pharmaceutical industries. In this work, the core-shell-shell magnetic polymeric microspheres (Fe 3 O 4 @SiO 2 @P(NIPAM-co-AIM)/Ni 2+ ) composed of an SiO 2 -coated Fe 3 O 4 magnetite core and a Ni 2+ -immobilized cross-linked poly (N-isopropyl acrylamide-co-propylimidazole) (NIPAM-co-AIM) shell were synthesized via distillation-precipitation polymerization. The Ni 2+ cations in the magnetic polymeric microspheres shell provided docking sites for histidine and the microspheres exhibited excellent performance in the separation of bromelain with a binding capacity as high as 198 mg/g, and the recovery of enzyme activity could achieve 80%. It was found that the microspheres showed excellent performance for separation and purification of bromelain from the crude extract of pineapple peel, moreover the enzyme structure remained unchanged before and after elution process.
研究领域:
生物化学
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材料科学
·
酶工程
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POWDER METALLURGY AND METAL CERAMICS
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2025
·
IF 0.6
Yang Xiao-Hui,Wang Ya-Long,Zhang Guo-Hua
Mo 2 FeB 2 -based cermets exhibit promising industrial manufacturing applications due to their excellent mechanical properties, higher oxidation resistance, and thermal stability. In this study, ternary boride solid solution powders of Mo 2 (Fe x , Ni 1– x )B 2 were successfully prepared with a unique technique via employing B 4 C powder as a boron source, Mo, Fe, and Ni powders as metal sources as well as Ca powder as the decarburization agent. The effect of the Fe/Ni ratio on the phase composition, morphological evolution and average grain size of powders was studied. The shift of diffraction peak in the XRD results and the homogeneous distributions of Mo, Fe, Ni, and B by the EDS energy spectrum validated the successful synthesis of ternary boride solid solution powders. The morphology of solid solution powders varied depending on the Fe/Ni ratio. For compositions with Fe/Ni ratios of 10 : 0, 7 : 3, and 5 : 5, the ternary solid solution powders exhibited pronounced spherical grains with average grain sizes of approximately 3, 1, and 1 μm, respectively. Conversely, when the Fe/Ni ratios were 3 : 7 and 0 : 10, the solid solution powders exhibited mixed morphologies of spherical (with diameters of approximately 1 μm) and prismatic grains (with lengths of about 8 μm and diameters of around 3 μm), corresponding respectively to the tetragonal and orthorhombic crystal structures of Mo 2 NiB 2 . Using ultrafine Mo powder as a raw material to boost reaction kinetics resulted in the product's stable phase being orthorhombic Mo 2 NiB 2 . Nonetheless, at a Fe/Ni ratio of 3 : 7, the product still consisted of orthorhombic and tetragonal Mo 2 NiB 2 phases.
研究领域:
材料科学
·
粉末冶金
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Catalysts
·
2026
·Vol. 16
·期 5
·409
·
IF 4.5
Linhao Zhang,Hong Liu,Jianming Zhang,Fagen Wang
Harnessing low-grade thermal energy from industrial processes and the environment represents an attractive route toward sustainable chemical production. In this work, we report a thermoelectrocatalytic (TE-Catal) system capable of converting small temperature gradients into chemical energy for hydrogen peroxide (H2O2) generation. A hybrid catalyst composed of nickel-based metal–organic frameworks (Ni-MOFs) nanoparticles integrated with carbon nanotubes (CNTs), Ni-MOFs/CNTs, was synthesized through a facile one-pot strategy. Under a temperature gradient, the thermoelectric response of the Ni-MOFs induces charge carrier generation through the Seebeck effect, enabling interfacial redox reactions that produce H2O2. However, rapid recombination of thermally generated carriers typically limits catalytic efficiency. By coupling Ni-MOFs with conductive CNTs networks, charge separation and transport are significantly enhanced due to the strong interfacial interaction and the high electrical conductivity of CNTs. As a result, the Ni-MOFs/CNTs nanohybrids exhibit greatly improved H2O2generation rate of ~111.7 µmol g−1h−1compared with pristine Ni-MOFs (31.8 µmol g−1h−1). Thermoelectric electrochemical measurements confirm that the CNT incorporation effectively promotes carrier migration and suppresses recombination. This study demonstrates the potential of MOF-based thermoelectric nanostructures for transforming waste heat into valuable chemical products.
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JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Kun Lang,Yuanyingxue Gao,Panzhe Qiao,Xudong Xiao,Mingyang Liu,Bin Wang,Xinrui Li,Wei Wu,Jingping Ge,Huiyuan Meng,Baojiang Jiang
Air calcination stabilizes LaMnO 3 but can promote particle coarsening and oxidation-driven Mn-valence elevation, reducing Mn e g -electron availability for nitrite-to-ammonia conversion. Here, B-site Ni regulation yields a more dispersed LaMnO 3 nanoperovskite, LaMn 0.95 Ni 0.05 O 3 (LMNO), while coupling oxygen-defect formation with Mn-valence rebalancing without disrupting the LaMnO 3 -type lattice. Combined structural and spectroscopic analyses show stronger oxygen-defect signatures, enhanced lattice-oxygen reducibility, lower average Mn valence, and altered Mn-centered coordination after Ni incorporation. These changes suggest electron compensation of neighboring high-valent Mn species and a more electron-rich Mn–O environment for nitrite activation and hydrogenation. In situ infrared spectroscopy and density functional theory calculations further indicate stepwise intermediate hydrogenation, favorable H 2 O dissociation and initial NO 2 stabilization at Ni sites, Ni 3d and Mn 3d/O 2p states near the Fermi level, and more favorable overall conversion thermodynamics at Ni-regulated Mn sites. LMNO delivers an NH 3 yield rate of 8996 μg h −1 cm −2 with 97.3% Faradaic efficiency and remains stable for 400 h. Downstream acid trapping enables crystalline NH 4 Cl recovery, while tests with pretreated landfill leachate show a shift in nitrogen speciation toward NH 4 + and reduced seedling-growth inhibition.
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高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Wen Wu,Ying Li,Limin Liang,Qiuyan Hao,Jun Zhang,Hui Liu,Caichi Liu
Antimony selenide (Sb2Se3) semiconductor with a narrow band gap is regarded as an ideal candidate for the next-generation broadband photodetectors. However, the photodetectors based on the binary Sb2Se3 semiconductor suffer from low responsivity (Rλ) and external quantum efficiency due to the intrinsic low electrical conductivity. To address the issue, we introduce a low-valence Ni cation (Ni2+) into the binary Sb2Se3 ((Sb1–xNix)2Se3) nanorods synthesized by a facile hot-injection process. With increasing Ni-doping concentration, the (Sb1–xNix)2Se3 nanorods exhibit a significant increase of electrical conductivity from 4.983 × 10–5 to 4.011 × 10–4 Ω–1 m–1. The photodetector based on (Sb0.995Ni0.005)2Se3 nanorod film exhibits an excellent responsivity of 18.9 mA/W under white light illumination of 45 mW/cm2 at an applied bias voltage of 3 V, which is an approximately 19-fold higher than that of the pristine Sb2Se3 nanorod photodetector. Moreover, the density functional theory calculation has demonstrated that the Ni2+ doped into Sb2Se3 will preferentially occupy the Sb site and introduce a shallow energy level of acceptor, resulting in the enhancement of electrical conductivity, which is consistent with the experimental result. Therefore, the work proves the substitution of Sb site with a low-valence metal cation into Sb2Se3 is an effective strategy to improve the performance of the Sb2Se3-based photodetector.
研究领域:
材料科学
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光电子学
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半导体物理
·
纳米技术
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RSC Advances
·
2022
·Vol. 12
·期 45
·29177-29186
·
IF 4.036
Zhao Qin,Yanqin Xu,Lin Liu,Min Liu,Hanjun Zhou,Liyue Xiao,Yuan Cao,Changguo Chen
Electrodes for supercapacitors made from metal–organic frameworks (MOFs) are still hindered by electron transfer properties. Therefore, an electrode composite material Ni-MOF@PPy was synthesized from a Ni-based metal–organic framework (Ni-MOF) doped with poly-pyrrole (PPy) using a simple chemical oxidation method to improve its electron transfer property. After introducing the electrochemically active substance K4Fe(CN)6 into the electrolyte, the composite material had a specific capacitance of 1815.4 F g−1 at a current density of 1 A g−1. Ni-MOF@PPy and active carbon (AC) as the positive and negative electrodes have been used, respectively, to assemble asymmetric supercapacitors (ASCs) in the KOH and K4Fe(CN)6 mixed electrolyte. This novel Ni-MOF@PPy//AC ASC energy storage device can provide 38.5 W h kg−1 energy density, 7001 W kg−1 power density, and 90.2% capacitance retention after 3000 cycles. Therefore, Ni-MOF@PPy//AC ASC is an excellent energy storage device with practical and economic value. The synergistic effect strategy proposed in this work can be easily applied to develop other MOFs with unique crystal structures as well as other redox active additives, providing new avenues and research ideas for exploring novel energy storage devices.
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DOI
PubMed
高影响因子
Water
·
2022
·Vol. 14
·期 9
·1420
·
IF 3.53
Juan Peng,Yameng Ma,Xiao Huang,Jianghua Yu,Fengjiao Yu,Jingsi Gao
Ni-ethylenediaminetetraacetic acid (Ni-EDTA) poses serious threats to the ecological environment and human health, due to its acute toxicity and low biodegradability. The decomplexation efficiency of Ni-EDTA through the conventional Fenton process has been constrained to pH; thus, other appropriate approaches are required to destroy the stable chelate structure at a neutral pH. In this study, the effect of operating parameters such as the pH, Fe2+concentration, particle electrode dosage, current density, and coexisting ions was studied. The results revealed that the 3D-EF system owned advantages for the removal of Ni-EDTA in the broadening of the pH application window. The Ni-EDTA removal efficiency in the 3D-EF system reached 84.89% after 120 min at a pH of 7. In addition, the presence of coexisting ions slightly affected the decomplexation efficiency of Ni-EDTA.Keywords:Ni-EDTA;three-dimensional electro-Fenton;neutral pH;decomplexation
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xingang Luan,Qinghua Zhao,Shaomin Gu,Xichao Dong,Laifei Cheng,Ralf Riedel
Wireless passive sensors based on surface acoustic wave (SAW) provide a good solution for the measurement demand under high temperature and harsh conditions. SiBCN ceramics have excellent mechanical properties at high temperature and semiconductor behavior, making them potential for electrode of SAW sensors. To achieve the target conductivity, a series of SiBCN and SiNiBCN coatings are prepared by polymer derived ceramics (PDC) method and the influence of microstructure on the conductivity of the coatings is discussed. The results show that the conductivity of the SiBCN coatings is affected by both the content of free carbon and the degree of graphitization. The introduction of Ni leads to the formation of Ni 2 Si conductive microcrystals at lower temperatures and catalyzes the graphitization of the carbon phase, so that the SiNiBCN coatings show lower electrical resistivity. The amount of the metal conductive phase and the graphitization degree of the carbon phase increase with the pyrolysis temperature, resulting in decrease of the SiNiBCN coatings resistivity.
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Nanoscale
·
2018
·Vol. 11
·期 3
·1058-1064
·
IF 7.233
Yu Ding,Ying Li,Yuanyuan Xue,Boqiang Miao,Shuni Li,Yucheng Jiang,Xien Liu,Yu Chen
Atomically thick ultrathin nanomeshes (NMs) possessing the inherent advantages of both two-dimensional nanomaterials and porous nanomaterials are attracting increasing interest in catalysis and electrocatalysis. Herein, we report a direct chemical synthesis of atomically thick Ni(OH)2-NMs by a NaBH4 assisted cyanogel hydrolysis method, which overcomes the shortcoming of the post-etching method for NM synthesis. Various physical characterization methods show that the as-synthesized Ni(OH)2-NMs have 1.7 nm thickness, a big surface area, abundant nanoholes, and numerous surface/edge atoms with low-coordination numbers. The as-synthesized Ni(OH)2-NMs show a better electrocatalytic performance for the urea oxidation reaction than conventional Ni(OH)2 nanoparticles without holes in the alkaline electrolyte, including a lower onset oxidation potential, faster reaction kinetics, and higher mass activity.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Zhihao Liu,Yachao Li,Kangzhou Wang,Yan Li,Yurong He,Jie Liang,Jianli Zhang,Tian-sheng Zhao,Noritatsu Tsubaki,Xinhua Gao
The design and preparation of highly active and stable Ni-based catalysts has attracted extensive attention. In this study, a series of embedded Ni@C catalysts were synthesized by a facile sol-gel method. After reduction at 400 °C, the optimized Ni@C-400 catalyst showed excellent performance in CO 2 methanation at a low temperature of 300 °C, with a CO 2 conversion of 74.3 % and good stability for 70 h. The characterization results indicated that after reduction treatment, the carbon species in the precursor were transformed into graphite carbon with more disorder defects. This structure facilitated the anchoring effect of the nickel components in the Ni@C catalyst, thereby forming a distinctive embedded structure that ensured the preservation of the nickel active phase in the catalyst following prolonged reaction. Therefore, the Ni@C catalyst prevented severe sintering and loss of loaded nickel. In addition, the interaction between Ni and C facilitated charge transfer, enhancing the CO 2 activation.
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高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jiajia Zheng,Zhihui Li,Jiayue Zheng,Han Chencheng,Yiming Chen,Zhiyi Wu
Designing an absorber to mitigate the electromagnetic radiation pollution caused by the rapid development of radio technology with multiple characteristics, including high reflection loss (RL), broad absorption bandwidth, thinness, and low filling ratio, is crucial but challenging. This work prepared three-dimensional heterogeneous MXene/Ni composites by using an electrostatic self-assembly method. Due to the synergistic effect of dielectric loss, magnetic loss, and the unique heterogeneous structure, the obtained multilayer MXene/Ni composites, with a low filling ratio of 15 wt % and a thickness of only 1.5 mm, achieved an astonishing minimum RL value of −79.6 dB and an effective absorption bandwidth (EAB) of 3.35 GHz. Furthermore, an ultrawide tunable EAB of 12.35 GHz could be obtained in the frequency range of 3.30–15.65 GHz by adjusting the matching thickness of the samples. This design of a heterogeneous interface structure provides a practical strategy to develop high-performance next-generation electromagnetic absorbers.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2011
·
IF 4.057
Y.J. Chai,Z.Y. Liu,H.N. Gao,Z.Y. Zhao,N. Wang,D.L. Hou
A nanoporous Ni layer on the surface of Mg was prepared utilizing the reduction reaction of Ni 2+ by Mg in NiCl 2 .12H 2 O solution. XRD result showed that the product was composed of cubic Ni, hexagonal Mg and little Mg(OH) 2 . SEM and TEM results suggested that a nanoporous Ni layer microencapsulated Mg and formed Ni@Mg. The specific surface area of Ni@Mg formed in this reaction was 65.3 m 2 /g. Hydrogen uptake increased as the temperature increased. Moreover, Ni@Mg showed a reversible hydriding-dehydriding process without formation of the stable hydrides, which indicated that the nanoporous Ni layer on the surface of Mg showed an obvious physisorption characteristics rather than hydrogen storage behavior of Mg.
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