FOOD CHEMISTRY
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2015
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IF 3.391
Mengshuo Li,Gang Hu,Yangyang Chen
This paper reports a method for evaluating antioxidant capacity based on the inhibitory effects of a macrocyclic Ni(II) complex-catalysed Briggs–Rauscher reaction. The macrocyclic Ni(II) complex NiL(ClO 4 ) 2 , in which L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene, is a porphyrin-like compound, the structure of which can be found in certain enzymes. The experiments indicated that three natural compounds could temporarily quench the oscillations for a period of time prior to regeneration of oscillations. The inhibition time was related to the compound type and concentration; thus, procedures for evaluating the antioxidant activities of polyphenolic compounds were successfully established. Three polyphenolic compounds were tested to evaluate their antioxidant activities: protocatechuic acid, rutin hydrate and procyanidin. Of these three naturally occurring compounds, procyanidin was found to be the most efficient antioxidant. We have also discussed the reaction of the antioxidant with the hydroperoxyl radical (HOO ) present in the oscillating system.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2016
·
IF 0
Jian Long,Xubiao Luo,Xiaocui Yin,Xing Wu
An unfamiliar functional monomer 2-(Allylmercapto) nicotinic acid (ANA), which contains both N and S groups that have a strong coordinating ability with nickel ions, is used for imprinting Ni(II). The obtained Ni(II) ion-imprinted polymer (Ni-IIP) shows a fast uptake ability for the removal of Ni(II), and its adsorption equilibrium time is less than 20 min. The maximum Ni(II) adsorption capacity of Ni-IIP is found to be 38.85 mg/g, that is, more than double that of non-imprinted polymer (Ni-NIP) (18.38 mg/g), at a temperature of 30 °C and optimum pH of 6. Additionally, the adsorption is a spontaneous and endothermic process according to the obtained thermodynamic parameters. Besides, Ni-IIP shows excellent selectivity factors of 33.63, 219.59, 4.23, 16.89 and 32.74 for Ni 2+ /Zn 2+ , Ni 2+ /Mg 2+ , Ni 2+ /Co 2+ , Ni 2+ /Cd 2+ and Ni 2+ /Cu 2+ , respectively. Moreover, the Ni-IIP used is stable because the adsorption capacity is 82.7% of the initial saturation binding capacity up to the 5th cycle. Most notably, the application of Ni-IIP in wastewater samples shows a high removal efficiency for Ni(II) of more than 93.4%. The results indicate that the Ni-IIP is an effective adsorption material, allowing for the selective removal of Ni(II) from aqueous solutions at high efficiency.
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BIOORGANIC CHEMISTRY
·
2024
·
IF 4.5
Haitao Zhu,Houcong Li,Yuxin Ji,Min Hou,Qingling Yang,Lili Liang,Wenge Li
A non-platinum-metal decanuclear complex [Ni 10 L 4 (CH 3 COO) 8 (C 2 H 5 OH) 8 ]·8(C 2 H 5 OH) ( Ni 10 complex) has been developed with a tri-dentate 2,3-dihydroxybenzaldehyde-2-aminophenol Schiff base ligand (H 3 L). Single crystal X-ray analysis reveals that the Ni 10 complex displays a sandwich loaf-shaped decanuclear structure and its anticancer activity was evaluated. The cell cytotoxicity results indicating that the Ni 10 complex is most effective to human breast cancer cells MDA-MB-231 and its mechanism were further investigated. Flow cytometry analysis showed that the Ni 10 complex triggered cell cycle arrest and induced apoptosis of MDA-MB-231 cells. Western blot analysis of the changes of intracellular protein expression showed that Ni 10 triggers MDA-MB-231 apoptosis through mitochondrial mediated apoptosis signaling pathways. In vivo experiments showed that the Ni 10 complex significantly suppressed breast tumor growth with low toxicity against major organs in a nude mice model. The good treatment effect, low toxicity and pharmacological mechanisms of the decanuclear Ni II complex may provide a clue for the research and development of non-platinum multinuclear based chemotherapeutic drugs.
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高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xin Ning,Yiyuan Lu,Heyun Fu,Haiqin Wan,Zhaoyi Xu,Shourong Zheng
Supported Ni catalysts on three mesoporous SiO2 supports (i.e., SBA-15, MCM-41, and HMS) were prepared using a solid-state reaction between Ni(NO3)2 and organic template-occluded mesoporous SiO2. For comparison, supported Ni catalysts on mesoporous SiO2 synthesized by the conventional impregnation method were also included. The catalysts were characterized by scanning electron microscopy, X-ray diffraction, UV–vis diffuse reflectance spectroscopy, N2 adsorption, X-ray photoelectron spectroscopy, H2 temperature-programmed reduction, transmission electron microscopy, and transmission electron microscopy–energy-dispersive X-ray. The catalytic properties of the catalysts were evaluated using gas-phase catalytic hydrodechlorination of 1,2-dichloroethane. The results showed that upon grinding Ni(NO3)2 with template-occluded mesoporous SiO2, strong coordination between Ni2+ and dodecylamine was identified in the Ni(NO3)2–HMS system. Additionally, the results of H2 temperature-programmed reduction revealed that NiO in calcined NiO/HMS was reduced at higher temperature than those in calcined NiO/SBA-15 and NiO/MCM-41, reflecting the presence of a strong interaction between NiO and mesoporous SiO2 in NiO/HMS. Consistently, the average particle sizes of metallic Ni were found to be 2.7, 3.4, and 9.6 nm in H2-reduced Ni/HMS, Ni/SBA-15, and Ni/MCM-41, respectively, indicative of a much higher Ni dispersion in Ni/HMS. For the catalytic hydrodechlorination of 1,2-dichloroethane, Ni/MCM-41 synthesized by the solid-state reaction method exhibited a catalytic activity similar to that prepared by the impregnation method, while higher catalytic activities were observed on Ni/HMS and Ni/SBA-15 than on their counterparts prepared by the impregnation method. Furthermore, a higher conversion was identified on Ni/HMS than on Ni/SBA-15 and Ni/MCM-41, highlighting the importance of template type for the preparation of highly dispersed metal catalysts on mesoporous SiO2.
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高影响因子
Desalination and Water Treatment
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2024
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IF 1
ZiJie Wang,Zheng Wang,Kai Xu,Lei Chen,ZiZeng Lin,YaLi Liu
Granular-activated carbon is a commonly used adsorbent in water treatment. It can be reused by regeneration when saturated, but there are limits to the number of regenerations in actual engineering. This study created a simple and economical treatment method allowing for the reuse of waste granular-activated carbon (WGAC) that approaches the regeneration limit. The adsorption kinetics, equilibrium, and thermodynamics of Ni(II) onto the treated waste granular-activated carbon (TWGAC) and the new granular-activated carbon (NGAC) were studied. The N 2 adsorption/desorption isotherms, zeta potential, SEM, energy-dispersive spectrometry and FTIR spectra were used to characterize and compare the NGAC and TWGAC. Analysis revealed that the structure of WGAC was severely damaged, but the adsorption capacity and adsorption mechanism after treatment were similar to those of NGAC. Experimental data showed that the pseudo-second-order kinetic model and the Freundlich isothermal model had high correlation coefficients (R 2 > 0.99). The maximum adsorption capacity of TWGAC and NGAC was 138.9 and 123.5 mg g –1 . Thermodynamic parameters, including the negative values ΔG, positive values ΔH, and positive value ΔS, indicated that the current adsorption processes of TWGAC and NGAC were feasible, spontaneous and endothermic. After three cycles, TWGAC’s removal rate for Ni(II) remained as high as 95.3%.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 96
·79022-79030
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IF 3.84
Lei Xu,Xiaoqiong Lu,Xiaomin Cheng
A series of novel cotton cellulose-graft-polycaprolactone copolymers with different grafting contents were successfully prepared via ring-opening polymerization (ROP) in an ionic liquid 1-N-butyl-3-methylimidazolium chloride ([Bmim]Cl). The structures of the grafting copolymers were systematically characterized by FTIR, CP/MAS13C-NMR, XRD, SEM and AFM, while thermal properties were investigated by DSC and TGA. Subsequently, Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D–R) adsorption isotherms were representative to simulate adsorption isotherms of Cu(II) and Ni(II) ions in aqueous solution. From the comparison of different adsorption isotherm models, it was found that adsorption of Cu(II) by modified cellulose followed Langmuir, Freundlich and Temkin models, while that of Ni(II) followed the Freundlich model. The results of adsorption indicated that the selectivity sequence of metal ions on graft copolymers was Cu(II) > Ni(II) and the maximum removal capacities of Cu(II) and Ni(II) ions were 98.7% and 35.6%, respectively. Hence, the graft copolymers exhibited significant potential to be an environmentally feasible biosorbent for removal of Cu(II) and Ni(II) ions from aqueous solution.
研究领域:
环境科学
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高分子化学
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材料科学
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重金属去除
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吸附技术
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高影响因子
JOURNAL OF CLUSTER SCIENCE
·
2023
·
IF 2.8
Luo Yun,Hou Min,Yan Yu,Li Wen Ge,Tong Jing
The Schiff base ligand (5-bromosalicylaldehyde)-2-aminophenol (H 2 L) and its complex were synthesized and characterized. The crystal structure was established by single-crystal X-ray diffraction, which showed that the monomer [Ni 4 L 4 (CH 3 CH 2 OH) 4 ]·1.46(CH 3 CH 2 OH) (the Ni(II) complex) crystallized in the tetragonal structure with space group I 4 1 / a . IR, elemental analysis, and thermogravimetric analysis were used to further confirm the structure of the Ni(II) complex. Its independent unit consists of four Ni(II) atoms, four L 2− Schiff base ligands, and four coordinated ethanol molecules. In vitro anticancer activities against the four human cell lines, A-549, MDA-MB-231, SMMC-7721, and CNE-2Z, revealed that the Ni(II) complex exhibited significant anticancer activity. Furthermore, the anticancer activities of the Ni(II) complex on SMMC-7721 and CNE-2Z cells were much better than that of cisplatin. In addition, migration and the Transwell assay illustrated that the Ni(II) complex could inhibit the invasion and cell migration of tumor cells CNE-2Z and SMMC-7721.
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POWDER TECHNOLOGY
·
2022
·
IF 5.64
Yu Xing,Qian Li,Xiaoyi Chen,Miao Li,Shujing Wang,Yan Li,Tianyu Wang,Xitong Sun,Xianzhen Li
A series of polymer brushes were formed on the surface of mesoporous silica microspheres by copolymerizing 1-vinyl imidazole and acrylic acid through reversible-addition fragmentation chain transfer (RAFT) polymerization, with pI-switchable property and high grafting groups content. The resulting materials (SiO 2 @poly(VI- co -AA)) were then applied for removing Ni(II) from aqueous solution with a fast adsorption rate, and the maximum adsorption capacity was 62.81 mg/g. Significantly, the removal rate of 30 mg/L of Ni(II) could reach up to 99.40%, and the adsorbent also exhibited a good reusability, with the desorption efficiency of over 99%. Furthermore, the adsorption mechanism was supposed to be electrostatic interaction and complexation characterized by Zeta potentials and XPS . It implied that the SiO 2 @poly(VI- co -AA) microspheres could be considered as a potential adsorbent for removing Ni(II) from wastewater, and was expected to expand its application to remove other heavy metals and dyes.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2022
·Vol. 36
·期 10
·e6833
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IF 4.072
Jing Hu,Yun Luo,Min Hou,Jia Jia Qi,Li Li Liang,Wen Ge Li
Two dinuclear complexes [Cu 2 (LO) 2 ] and [Ni 2 L 2 Cl 2 (C 2 H 5 OH) 2 ] derived from (5-chlorosalicylaldehyde)-4-aminoantipyrine (HL) were synthesized and characterized by infrared (IR) spectroscopy，thermogravimetric analysis, and powder X-ray diffraction. Molecular structures of the Cu (II) and Ni (II) complexes were determined by single-crystal X-ray diffraction. Their cytotoxicity was evaluated by methyl thiazolyl tetrazolium assay against human tumor cells, such as lung carcinoma A549, lung adenocarcinoma H1975, breast carcinoma MDA-MB-231, and nasopharyngeal carcinoma CNE-2Z cell lines. The results showed that the Cu (II) complex had much better anticancer activity than the Ni (II) complex, especially for MDA-MB-231 and CNE-2Z cells. The reason may be that they have different structures. The methyl group on the (5-chlorosalicylaldehyde)-4-aminoantipyrine (HL) was oxidized to the hydroxymethyl group, herein, namely LO, which is difficult to achieve in the normal chemical synthesis process. However, we did it by a solvothermal method at low temperature. It provides a new way of thinking and synthesis. The anticancer activity of the copper complex was next only to cisplatin, and the copper complex was nontoxic for the human normal cell lines. The experiment results also showed that the copper complex could inhibit tumor cell proliferation through the cell cycle and cell apoptosis.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Jun Wan,You Shen,Liqiang Xu,Ruixue Xu,Jinfan Zhang,Haodi Sun,Chongyu Zhang,Chuanxia Yin,Xinxing Wang
The development of selective electrochemical response materials and new detection strategies are the research focus in the field of heavy metal ion (HMI) electroanalysis. Herein, a Ni(II)-based metal-organic framework (NH 2 -Ni-MOF) was synthesized and functionalized by electrochemically active molecule of ferrocene (Fc) via post-synthesis modification. Based on the Fc-functionalized NH 2 -Ni-MOF (Fc-NH 2 -Ni-MOF), a novel electrochemical ratiometric sensing platform was developed and applied for the simultaneous determination of various HMIs. The prepared NH 2 -Ni-MOF exhibits nanoplate structure, which is conducive to increase accessible electrode area and expose more active sites, thus promoting the adsorption and pre-concentration of HMIs. The modification of Fc on MOF not only enhances the electrical conductivity of the MOF material, but also provides an internal reference signal for the ratiometric analysis. Due to the excellent characteristics of the Fc-NH 2 -Ni-MOF, the as-prepared ratiometric electrochemical sensing platform exhibits wide linear ranges (0.001 μM to 2.0 μM for lead ions (Pb 2+ ), and 0.01 μM to 2.0 μM for copper ions (Cu 2+ ) as well as cadmium ions (Cd 2+ )) and high sensitivity (the detection limit toward Cu 2+ , Pb 2+ and Cd 2+ is 6.3 nM, 0.2 nM and 7.1 nM, respectively). In addition, compared with the non-ratiometric strategy, the reproducibility of ratiometric analysis is significantly improved. The developed electrochemical method with high sensitivity, selectivity and reliability exhibits bright application prospects in the detection of real samples. Moreover, the electrochemical application of MOF materials has been effectively expanded.
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高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2015
·Vol. 91
·期 5
·1378-1386
·
IF 2.349
Qiujin Jia,Dongping Li,Xuechuan Gao,Jilong Yan,Qinglin Ma,Fanjun Meng
BACKGROUND Although methyl acrylate has been graft polymerized from cellulose and functionalized with hydrazine and hydroxylamine for removal of copper and nickel ions, the adsorption capacity was less than 80 mg g −1 . The present work reported hydrazinolysis of cellulose-graft-polymethyl acrylate and remarkably improved adsorption capacity for Cu(II) and Ni(II) in aqueous solution. RESULTS Hydrazinolyzed cellulose-graft-polymethyl acrylate (Cell-g-PMA-HZ) has been prepared by ceric salt-initiated graft polymerization of methyl acrylate from microcrystalline cellulose surface and subsequent hydrazinolysis with hydrazine hydrate. The successful synthesis was confirmed by Fourier-transform infrared spectroscopy, 13 C-NMR, elemental analysis, scanning electron microscopy and thermogravimetric analysis. Adsorption behavior of Cell-g-PMA-HZ for Cu(II) and Ni(II) were studied through batch static adsorption processes and column chromatography methods. The influences of graft yield, initial pH, contact time and temperature on adsorption capacity of Cell-g-PMA-HZ as well as adsorption equilibrium, kinetic and thermodynamic properties were studied in detail. Kinetic adsorption can be explained by pseudo-second-order and adsorption isotherms fitted with Langmuir isotherm model, from which maximum equilibrium adsorption capacity can be derived as 229.36 mg g −1 for Cu(II) and 173.91mg g −1 for Ni(II) at 28°C. Further thermodynamic investigation indicated that adsorption of Cu(II) and Ni(II) by adsorbent Cell-g-PMA-HZ was exothermic and spontaneous under the studied conditions. CONCLUSIONS Hydrazinolysis of cellulose-graft-polymethyl acrylate has been accomplished. As an adsorbent, the prepared Cell-g-PMA-HZ was reusable and fairly efficient for removal of Cu(II) and Ni(II) from aqueous solution. © 2015 Society of Chemical Industry
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Surfaces and Interfaces
·
2024
·
IF 5.7
Yitong Guo,Yukai Chang,Libo Wang,Qixun Xia,Aiguo Zhou
In this work, two−dimensional Mo 2 CT x MXene pillared with transition metal complexes [Fe(III), Co(III), or Ni(II)] was prepared, which shows ultra−high performance as the anode of lithium−ion batteries (LIBs). Firstly, Mo 2 CT x was pretreated with hexadecyl trimethyl ammonium bromide (CTAB) as a surfactant and then mixed with hydrated chloride (FeCl 3 ·6H 2 O, CoCl 2 ·6H 2 O, or NiCl 2 ·6H 2 O) at room temperature. The molar ratio of MXene to hydrated chloride was 1:1. In this process, metal ions (Fe 3+ , Co 2+ , or Ni 2+ ) were successfully loaded on the nanosheets of Mo 2 CT x . The ions were combined with the surface terminated oxygen of MXene to form transition metal complexes by liquid phase agitation method. Moreover, transition metal complexes contribute a portion of their capacity and help Mo 2 CT x enhance its own capacity to a large extent. However, the electrochemical effects on Mo 2 CT x vary depending on the type of transition metal ions. As anodes of LIBs, the final discharge specific capacities after 100th cycles at 2 A g −1 were 511.68 mAh g −1 , 229.22 mAh g −1 and 78.19 mAh g −1 for Fe(III)@Mo 2 CT x , Co(III)@Mo 2 CT x , and Ni(II)@Mo 2 CT x , respectively, while the capacity of pure Mo 2 CT x after delamination was only 31.17 mAh g −1 . At 6 A g −1 , the final discharge capacity of Fe(III)@Mo 2 CT x was 227.4 mAh g −1 after 500th cycles. Therefore, Mo 2 CT x MXene pillared by the complexes, especially Fe(III) complexes, is a promising anode material with high−performance for lithium−ion batteries.
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