MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Bing Zhang,Likang Fu,Shixing Wang,Libo Zhang
Nanosilica was functionalized with imidazoline groups and used as a new sorbent to recycle Pd(II) from aqueous solution. The sorbent was investigated by thermogravimetric analysis (TGA), transmission electron microscopy (TEM), fourier transform infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS). The influence of pH, adsorption time and original Pd(II) concentration on recovery was discussed. The optimal pH value for adsorption was 4. The maximum adsorption quantity of Pd(II) was 69.6 mg/g. The coexisting ions exhibit little interference on the Pd(II) separation. The separation process of Pd(II) matches a pseudo-second-order kinetic model. The separation data obeyed best with the Langmuir isotherm model. The adsorbent exhibited good recyclability for Pd(II). Separation of Pd(II) takes place via chelation and ion-exchange. The adsorbent has wide application prospect to selectively capture Pd(II) from aqueous solutions.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Shanjian Li,Zekun Wang,Haoxuan He,Panfeng Wu
Pitting corrosion is a significant issue which significantly shorten the service life of carbon steel. In this study, imidazoline and thiourea are combined to assess the synergistic in the localized corrosion of Q235 carbon steel by a combined system. In detail, five different proportions of corrosion inhibitors are used in the simulated corrosion solution (5 wt. % NaCl + 0.5 wt. % CH 3 COOH + 1.0 wt. % Na 2 S) in the closed area to investigate the corrosion inhibition performance of Q235 steel at 80 °C. The corrosion behavior of the steel in the simulated solution was investigated using potentiodynamic polarization test and electrochemical impedance spectroscopy test. Due to the combination of imidazoline (IM) and thiourea (TU) corrosion inhibitors, the corrosion inhibitors in the simulated solution of the occlusion zone reduce the migration of corrosive anions to the occlusion zone and slowed the acidification of the solution resulting in lower concentrations of Cl - and S 2- to varying degrees and reaching a higher pH of the solution. As a result, the compounded corrosion inhibitors exhibit improved corrosion inhibition rate (80 mg/L IM+20 mg/L TU (86.91 %), 50 mg/L IM+ 50 mg/L TU (95.67 %), 20 mg/L IM+ 80 mg/L TU (86.16 %)) to Q235 steel, which is superior to that using imidazoline (63.42 %) or thiourea (92.77 %) alone. This enhanced performances fully prove the synergistic effect of imidazoline with thiourea.
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Guiqing Liu,Yunyi Han,Yuwei Hou,Yanjun Li,Xinxin Yang,Zhaocen Dong,Meili Guan,Xuezhong Gong,Jianguo Tang
In this work, a water-soluble guanidyl-imidazoline ( G ) was synthesized and used as a fluorescent probe to detect Zn 2+ in an aqueous environment without any mutually soluble organic solvent. G demonstrates excellent selectivity for Zn 2+ and strong anti-interference ability against other metal ions. It has an ultra-low detection limit of 25 nM for Zn 2+ ions, surpassing previously reported achievements. Job’s plot method, FTIR and XAFS revealed the binding mode of the G -Zn complex that the N atom in the G coordinates with Zn 2+ in a ratio of 2:1. Furthermore, this probe was successfully utilized for quantitative detection of Zn 2+ ions in tap water and synthetic water, and also applied to imaging Zn 2+ ions in living cells.
研究领域:
化学
·
生物分析
·
材料科学
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Yuyang Di,Yilei Lu,Xianliang Li,Zhihao Chen,Wenzhong Yang
In this paper, two imidazoline derivatives, N 1 -(2-aminoethyl)- N 2 -(2-((2-(2-heptyl-4,5-dihydro-1 H -imidazol-1-yl)ethyl)amino)ethyl)ethane-1,2-diamine (HEIM) and N 1 -(2-aminoethyl)- N 2 -(2-((2-(2-(perfluoroheptyl)-4,5-dihydro-1 H -imidazol-1-yl)ethyl)amino)ethyl)ethane-1,2-diamine (PFIM), have been used as corrosion inhibitors of carbon steels in 1 M HCl at elevated temperatures. Two inhibitors are confirmed by 1 H NMR, 13 C NMR, high-resolution mass spectra and FT-IR tools. Electrochemical and immersion tests indicate that the PFIM displays a stable protection performance at different temperatures, with an inhibition efficiency value around 95%. Moreover, scanning Electron Microscopy (SEM), energy dispersive X-ray (EDX) analysis, atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS) indicates that the PFIM inhibitor film shows high hydrophobicity and stability at 363 K. Theoretical calculations suggest that the adsorption of PFIM is mainly through the bonding of the F of fluorocarbon chain on the Fe surface. This study helps us further explore the inhibition mechanisms of fluorocarbon chain-based imidazoline derivatives at high temperatures.
研究领域:
材料科学
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电化学
·
表面科学
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DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2014
·Vol. 17
·期 6
·1107-1116
·
IF 1.352
Wang Liyan,Liu Jia,Huo Shichao,Deng Qigang,Yan Tie,Ding Limin,Zhang Chao,Meng Lingwei,Lu Qiangna
Five new Gemini imidazolium surfactants were synthesized from imidazole and 1-bromoalkane (C 8 , C 10 , C 12 , C 14 , C 16 ) to get 1-alkylimidazole, which was further reacted with 1,3-dichloropropan-2-ol to form the surfactant molecule, 1,1′-(propane-1,3-diyl-2-ol) bis(3-alkyl-1 H -imidazol-3-ium) chloride. The structures of the five new surfactants and intermediates were characterized by 1 H-NMR, 13 C-NMR and IR spectra. Thermal properties of the five new surfactants were studied with thermogravimetric analysis and differential scanning calorimetry, the five new surfactants showed a transition from a crystalline phase to a thermotropic liquid–crystalline phase at around ca. 100 °C, which transformed to an isotropic liquid phase at around ca. 165 °C. The five new surfactants critical micelle concentrations (CMC) in the aqueous solutions were determined by surface tension and electrical conductivity methods. The surface tension measurements provided a series of parameters, including critical micelle concentration (CMC), surface tension at the CMC ( γ
CMC ), adsorption efficiency ( pC
20 ), and effectiveness of surface tension reduction (π CMC ). In addition, with application of the Gibbs adsorption isotherm, maximum surface excess concentration (Γ max ) and minimum surface area/molecule (A min ) at the air–water interface were obtained. The parameters β (degree of counterion binding to micelles), ΔG
θ ads
(Gibbs free energy of adsorption), and ΔG
θ mic
(Gibbs free energy change of micellization) were also derived. The results indicated that the five new Gemini surfactants exhibited very low CMC and a good efficiency in lowering the surface tension of water. The foamability and foam stability of the five new surfactants were also examined at different CMC.
研究领域:
化学
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材料科学
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物理化学
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DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Jinan Cao,Jingping Wang,Youlong Xu,Hao Yuan,Lihua Yang,Huiying Yuan
The oil and gas industry frequently uses liquid corrosion inhibitors to reduce equipment and pipeline corrosion. However, this approach requires frequent additions, which are costly in terms of labor and materials. Solid corrosion inhibitor capsules (SCICs) have become an optimal alternative, as they provide long-term corrosion protection. However, the current encapsulation materials need to be modified for improving encapsulation capability. In this study, lauryl acrylate (LA) was grafted onto Ethylene-vinyl-acetates (EVA) to reduce its crystallinity and increase the interface force between EVA and oleic imidazoline (OIM). OIM was then encapsulated using the grafted EVA (EVA- g -LA) to form matrix-type solid capsules that possess the high encapsulation efficiency and long service life. The analysis with a UV–Vis spectrophotometer revealed that OIM had a stable release process from the SCIC matrix. Over a period of 91 days, the released OIM still had a high corrosion inhibition efficiency towards N80 steel (>80%). Using the prepared SCIC can reduce annual anticorrosion costs in oil and gas fields by 70%.
研究领域:
材料科学
·
腐蚀与防护
·
石油工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Songlin Chen,Zhihao Shen,Zhengyong Song,Guang Han,Qicheng Feng
The flotation separation of Cu–Fe sulfide minerals often encounters challenges due to the use of inhibitors, which can lead to difficulties in recovering precious metals and the activation of inhibited minerals, thereby limiting the overall efficiency of resource utilization. Therefore, the exploration of highly selective collectors is of great significance. In this study, 2-phenylimidazoline (2-PI) was investigated as a novel collector for the selective flotation separation of chalcopyrite from pyrite. The variations in the surface properties of minerals were analyzed by means of contact angle tests, zeta potential tests, X-ray photoelectron spectroscopy (XPS), Fourier Transform infrared spectroscopy (FT-IR), atomic force microscopy (AFM), and localized electrochemical impedance spectroscopy (LEIS) tests. Flotation experiments indicated that after being treated with 1 × 10 –5 mol/L 2-PI, the flotation recovery of chalcopyrite exceeded 90 %, while that of pyrite was below 10 %. The results of contact angle, zeta potential, AFM, and LEIS tests demonstrated that 2-PI exhibited a stronger affinity for the surface of chalcopyrite. XPS and FT-IR analyses revealed that 2-PI underwent chemical adsorption on the chalcopyrite surface, with no significant adsorption on the pyrite surface. Consequently, 2-PI has the potential to be an alternative collector for the flotation separation of Cu–Fe sulfide minerals and shows promising applications for achieving the selective separation of chalcopyrite and pyrite in the absence of inhibitors.
研究领域:
矿物加工工程
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化学工程
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材料科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Congrong Yang,Suli Wang,Wenjia Ma,Luhua Jiang,Gongquan Sun
The alkaline stability of 1,2-dimethylimidazolium with various N3-substituents (including butyl, benzyl and vinylbenzyl) and corresponding quaternary ammonium small molecular compounds, and the 1,2-dimethylimidazolium- and quaternary ammonium-based membranes are systemically studied in the same condition. The spectroscopy (such as NMR, FT-IR, XPS and mass spectrum) results of the two kinds of small molecular compounds indicate that the quaternary ammonium cations are more stable than 1,2-dimethylimidazolium cations in 3 M KOH at elevated temperature, especially at 80 °C. Moreover, the alkaline stability of the 1,2-dimethylimidazolium cations would be influenced by the N3-substitutions of the imidazolium, and N3-butyl substituted cation shows a better alkaline stability. The quaternary ammonium-based membrane are also more stable than the 1,2-dimethylimidazolium-based membrane in 1 M KOH at 60 °C. In addition, the performance of the alkaline direct methanol fuel cell using quaternary ammonium-based membrane (22 mW cm −2 ) is much better than that of the fuel cell using 1,2-dimethylimidazolium-based membrane (0.04 mW cm −2 ).
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Hui Shu,Tingrun Lai,Zhichao Yang,Xuechun Xiao,Xiumin Chen,Yude Wang
High sensitivity and ultra-trace detection of imidacloprid are important and challenging in the field of food. In this study, we prepared a Fe-rich FeCoNi-MOF in-situ modified nickel foam working electrode by one-step hydrothermal method, and achieved a highly sensitive detection of the imidacloprid. The characterization techniques confirmed that Fe-rich FeCoNi-MOF had excellent crystallinity, tighter structure, and exposed rich active sites. The detection results showed that Fe-rich FeCoNi-MOF electrochemical sensor had a minimum detection limit of 0.04 pmol/L (100 times lower than that of the bioelectrochemical sensors), a wide response range (1 pmol/L–120 μmol/L), and high sensitivity (124 μA pmol/L -1 cm −2 ). These advantages of the electrochemical sensor were revealed theoretically by the valence change of active metal and the first principle calculation. Lastly, the Fe-rich FeCoNi-MOF electrochemical sensor was applied to detect imidacloprid in apple, fresh tea leaves, tomato, cucumber, and had an excellent recovery of 98–102.8 %.
研究领域:
食品科学
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分析化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Peng Zhang,Xingying Meng,Aiju Liu,Mingming Ma,Yifei Shao,Hongwen Sun
The effects of an electron shuttle (dissolved black carbon (DBC) derived from biochar) on the microbial reduction of ferrihydrite and subsequent imidacloprid (IMI) degradation were studied. The results showed that DBC addition enhanced the microbial reduction of Fe(III) in ferrihydrite and increased the quantity of Fe(II) released into the liquid phase. The electron transfer capacity of DBC was significantly influenced by the content of redox-active oxygen-containing functional groups (e.g., quinone , hydroquinone, and polyphenol groups), which was dependent on the pyrolysis temperature. The electrochemical characteristics of DBC resulted in enhanced electron transfer , which promoted Fe(III) reduction and mediated the microbial transformation of ferrihydrite. The microbial transformation of ferrihydrite resulted in the formation of secondary minerals such as siderite and vivianite . The IMI degradation efficiency was related to the Fe(III) reduction rate and the pyrolysis temperature used in DBC production, and the degradation pathways were nitrate reduction and imino hydrolysis induced by the Fe(II) generated from the reduction of Fe(III) in ferrihydrite. The results obtained in this study provide new data for understanding the multifunctional roles of biochar-derived DBC in the redox and transformation processes of iron minerals induced by iron-reducing bacteria, the related biogeochemical cycles of iron and the fate of pollutants .
研究领域:
环境科学
·
微生物学
·
土壤化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Xing Cui,Hai Zhu,Chao-Hong He,Ke-Jun Wu
The thermal conductivities of 1-butyl-3-methylimidazolium l-tryptophan ([BMIM][l-trp]), water, ethanol, [BMIM][l-trp] + water, [BMIM][l-trp] + ethanol, water + ethanol, and [BMIM][l-trp] + water + ethanol were investigated from 283.15 to 333.15 K covering the whole scale of concentration at atmospheric pressure with the transient hot wire method. The thermal conductivities of pure [BMIM][l-trp] decease linearly from 0.180 to 0.177 W·m–1·K–1 with increasing temperature. The uncertainty of the measurement was less than 2% at the 0.95 confidence level. The experimental data of binary and ternary mixtures were correlated by a second-order Scheffé polynomial as a function of composition and temperature. The average relative deviation of the calculated values with experimental data was 0.58%.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2017
·Vol. 20
·期 5
·1121-1127
·
IF 1.45
Chen Xuewei,Xin Yujuan,Yu Fangcai,Lan Zhili
A series of carboxylic ester-containing imidazolium-based zwitterionic surfactants, namely, monoalkyl 2-(3-methylimidazolium-1-yl) succinate inner salts (C n MimSU, n = 8, 10, 12 and 14), have been synthesized. Their structures were confirmed by 1 H NMR, 13 C NMR and FTIR. The typical physicochemical properties parameters such as isoelectric point, critical micelle concentration (CMC), surface tension at CMC ( γ
CMC ), surface pressure at CMC (Π CMC ), adsorption efficiency (p C
20 ), the maximum surface excess ( Γ
m ), the minimum molecular cross-sectional area ( A
min ) and the value of CMC/ C
20 were determined. The effect of the long-chain length on the important physicochemical properties of C n MimSU was studied. It is found that the surface activity of C n MimSU is enhanced with the long-chain length increases.
研究领域:
化学
·
材料科学
·
表面化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）