SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
·
IF 2.88
Xiang-yu Kong,Ling-Jie Hou,Xiu-qing Shao,Shao-Min Shuang,Yu Wang,Chuan Dong
A novel fluorescent probe , phenolphthalein‑dialdehyde‑(2‑pyridyl) hydrazone (L), for sequentially detecting Al 3+ and F − in almost 100% aqueous medium was successfully designed and synthesized. The probe offers two binding pockets for Al 3+ to form a 1: 2 ligand/metal complex, leading to a significant fluorescence enhancement at 465 nm. Further, the in-situ formed L-Al complex acts as a secondary fluorescent chemosensor for F − by quenching the fluorescence of the complex with high selectivity. The detection limit for Al 3+ and F − sensing is 2.28 nM and 0.13 μM, respectively, which are far below the World Health Organization (WHO) acceptable limits (7.41 μM for Al 3+ ion and 79 μM for F − ) in drinking water . The probe L was successfully applied to the detection of Al 3+ and F − in cells using fluorescence microscopy .
研究领域:
分析化学
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生物医学
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DOI
PubMed
高影响因子
Polymers
·
2019
·Vol. 11
·期 3
·411
·
IF 3.164
Liujun Pei,Yuni Luo,Xiaomin Gu,Huashu Dou,Jiping Wang
The main goal of this article is to study the diffusion mechanism of aqueous solutions and the swelling of cellulosic fibers in the silicone non-aqueous dyeing system via fluorescent labeling. Due to non-polar media only adsorbing on the surface of fiber, cellulosic fiber could not swell as a result of the non-polar media. However, because water molecules can diffuse into the non-crystalline region of the fiber, cellulosic fiber could swell by water which was dispersed or emulsified in a non-aqueous dyeing system. To study the diffusion mechanism of an aqueous solution in the siloxane non-aqueous dyeing system, siloxane non-aqueous media was first diffused to the cellulosic fiber because of its lower surface tension. The resulting aqueous solution took more time to diffuse the surface of the cellulosic fiber, because water molecules must penetrate the siloxane non-aqueous media film. Compared with the fluorescent intensity of the fiber surface, the siloxane film could be re-transferred to the dye bath under the emulsification of the surfactant and the mechanical force. Therefore, a longer diffusion time of the aqueous solution ensured the dyeing feasibility for cellulosic fiber in the non-aqueous dyeing system.Keywords:non-aqueous medium;cellulosic fiber;siloxane;diffusion;swelling
研究领域:
纺织科学
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化学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
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2013
·
IF 2.266
Ting Wen,Fei Qu,Nian Bing Li,Hong Qun Luo
In this work, we developed a facile, sensitive, and rapid spectrophotometric method for copper(II) ion detection in aqueous media using polyethyleneimine. Polyethyleneimine is a cationic polymer that has no absorption in the wavelength range of 250–800 nm. When trace amounts of copper(II) ion was added to the colorless polyethyleneimine solution, copper(II) ion could react with the amino groups of the polyethyleneimine to form a dark blue cuprammonium complex whose absorption spectrum exhibited two absorption peaks at 275 and 630 nm, respectively. The effects of parameters such as polyethyleneimine concentration, pH, temperature, reaction time, and the most suitable medium for the reaction were investigated. A linear relationship ( R 2 = 0.9997) between absorbance and the concentration of copper(II) ion was found at the maximum absorption peak of 275 nm in the concentration range of 2–400 μM. The detection limit for copper(II) ion was 566 nM. The response of polyethyleneimine toward different metal ions was investigated, and polyethyleneimine displayed a high selectivity for the copper(II) ion among the metal ions examined. This biocompatible and sensitive sensor may find applications in copper(II) ion detection in environmental and biological processes.
研究领域:
分析化学
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环境科学
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生物化学
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产品关联
DOI
高影响因子
Journal of Materiomics
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2020
·
IF 5.797
Gajula Prasad,Jun-Wei Liang,Wei Zhao,Yingbang Yao,Tao Tao,Bo Liang,Sheng-Guo Lu
The effect of a N,N-dimethylformamide (DMF)/acetone solvent system (3:7, 4:6, 5:5, 6:4, 7:3) and spinning medium (air and water) on the membrane morphology and the structure-property relationship were investigated. A facile method was optimized to generate a porous, polymer-fiber membrane via the combinative effect of electrospinning and thermally inducing phase separation of the DMF/acetone (4:6) solvent system in a water medium. The attenuated total reflection (ATR) - Fourier transform infrared (FTIR) results showed an increased β-phase compared to the pristine poly(vinylidene fluoride) (PVDF). The XRD and DSC results further confirmed that the co-existing α- and β-phases in the pristine PVDF were converted into a unique β-phase in the electrospun membranes. In addition, the solvent uptake percentage of the DMF/acetone (4:6) solvent system in a water medium (540) is much greater than that in an air medium (320), and over two times better than that of commercial polyethylene (PE) membranes (190). Similarly, the discharge capacity of the PVDF membrane separator prepared with the DMF/acetone (4:6) solvent system in a water medium is higher than that of the air medium. This enhancement of solvent uptake might be due to the interconnected porous morphology present in the water medium.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
NANO
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2019
·
IF 1.293
Bingjie Xu,Mengxing Li,Qi Chen,Pengfei Liu,Baosong Xu,Ben Qiu,Liang Xu,Zhao Han
The present study describes a novel method to improve the dispersibility of silicon nitride powders in aqueous media. Specifically, a new Si 3 N 4 @g-C 3 N 4 core–shell composite material was synthesized via annealing the mixture of silicon nitride and melamine under a nitrogen atmosphere using heating method. The effects of various initial mass ratios of Si 3 N 4 and melamine on the structure and dispersibility of the composite were systematically investigated. The results of X-ray photoelectron spectroscopy and transmission electron microscope demonstrated that as-obtained Si 3 N 4 @g-C 3 N 4 composite powders possess the core–shell structure, whereas the zeta potential and sedimentation analysis showed that they exhibit good dispersion in aqueous media. Furthermore, the colloidal dispersion of the composite powders is most stable when the initial mass ratio of Si 3 N 4 and melamine is 100:3. The coated g-C 3 N 4 could be completely removed in a cryogenic nitrogen atmosphere. The proposed process is expected to provide novel avenues for the study of dispersion of other inorganic powders.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Huan Zhou,Xianyu Huang,Sining Zheng,Hongyu Guo,Fafu Yang
The selective detection of arginine among all kinds of amino acids is of great significance but rarely reported. In this work, a simple fluorescence sensor for sensing arginine in near aqueous media was developed based on bis-cyanodistyrene Schiff-base ( BCS ). BCS was prepared by the Schiff-base condensation of amino-cyanodistyrene derivative and bis-benzaldehyde in yield of 86 %. BCS possessed high fluorescence in near aqueous media and exhibited selective detection for arginine among all kinds of test species including six common metallic ions and twenty amino acids. The detection limitation for arginine was as low as 1.34 × 10 −7 M. BCS showed the good sensing ability in pH = 6–9 and the sensing selectivity kept stable under the interference of other species. The 1:1 binding mechanism was proposed based on the multiple intermolecular hydrogen bonds. The selective sensing ability of BCS for arginine was successfully applied on tested paper and the sample analyses of MinJiang river and adults urine. BCS was further used in the living-cell imaging experiments, suggesting the excellent fluorescence imaging property and the good detecting ability for arginine in living-cell environment. This research supplied a good method for real-time and in-situ sensing arginine in complicated environments and living bodies.
研究领域:
分析化学
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生物化学
·
医学检测
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
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2018
·Vol. 229
·期 6
·1-11
·
IF 1.769
Wang Jian,Yan Yanan,Tian Lili,Wang Qinmei,Zhang Yan,Cao Weiqin,Yang Chun
Reactive Red 141 (RR 141) was efficiently adsorbed and enriched from an aqueous solution by oppositely charged cryogels. The cryogels were prepared with acryl amide (AAm) and dimethyl diallyl ammonium chloride (DDAC) as the monomers, along with N,N′-methylene-bis acrylamide (MBA) as the cross-linker. In the presence of DDAC, the prepared macroporous cryogels hold a strong affinity to the reactive dye. The elasticity and mechanical properties of the cryogels were improved when the mass ratio of the monomer and the cross-linker was 2:1. A maximum adsorption capacity was achieved with 21 wt% of DDAC in reactants. The impacts of conditions of non-aqueous electrolysis such as solvent types, electrolytic voltages, and electrolyte concentrations were investigated. When subjected to non-aqueous electrolysis in organic media of N-methyl pyrrolidone (NMP), propylene carbonate (PC), and ethylene carbonate (EC), the cryogel-adsorbed dye underwent a quick and efficient degradation. Higher Faradaic efficiencies were obtained compared with that from the same operations in aqueous media. The specific degradation rate of RR 141 in a non-aqueous electrolysis is substantially larger than that reported. In addition, both the cryogel and the organic solvents can be repeatedly used, making it a sustainable method to deal with related pollution problems of reactive dyes.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Kaiyang Xu,Yu Chen,Hua Yang,Yuyan Gan,Lizhi Wu,Li Tan,Yihu Dai,Yu Tang
Cyclohexanone is an important raw material for manufacturing nylon and other chemicals. The sustainable conversion of biomass derived molecules to cyclohexanone is desired but still challenging. Herein, a palladium single atom catalyst anchored in the micropores of zeolite (namely Pd 1 /ZSM-5) is designed and exhibits remarkable catalytic activity in transforming anisole to cyclohexanone in water medium (H 2 O), without using of organic solvent or halogen promoter. The selectivity to cyclohexanone is 91.2% and the turnover rate (TOR) is 400.8 h −1 at 453 K. The Pd sites, acid sites, and microporous confinement environment of zeolite cooperate to promote the partial hydrogenation to cyclohexanone, and inhibit further hydrogenation as the side reaction. H 2 O not only acts as the solvent, but also participates significantly in the partial hydrogenation. Moreover, as revealed by isotope labelled experiments (D 2 O and H 2 18 O), the water participated hydrogenolysis and the consequent partial hydrogenation mechanism is proposed.
研究领域:
催化化学
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绿色化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 3
·369-374
·
IF 1.248
Mi Zhiming,Chen Yao,Chen Xiaodong,Yan Liuqing,Gu Qiang,Zhang Hanqi,Chen Chunhai,Zhang Yumin
A small molecule fluorescent probe, 4-[2-(4-chlorophenyl)-4,5-diphenyl-1 H -imidazol-1-yl]aniline(L) for detecting Ag + ion was gently synthesized via one-pot multi-component reaction catalyzed by H 3 [PW 12 O 40 ] under solvent-free microwave irradiation. When the concentration of Ag+ ion changed from 0 to 8.0×10 −6 mol/L in the solution of H 2 O/CH 3 OH(19:1, volume ratio), the fluorescence emission spectrum was blue-shifted and accompanied by a gradual increase in fluorescence intensity with a low detection limit of 3.0×10 −11 mol/L. Moreover, UV-Vis absorption titration experiment demonstrated a 1:1 stoichiometric ratio and an association constant of (9.95±0.44)×10 5 L/mol between probe L and Ag + ion, and thus their complexation mechanism was also proposed and verified. More importantly, this fluorescent probe was remarkably specific for Ag + ion under the interference of other metal ions and exhibited a wide pH application range of 4.0―8.0. Additionally, preliminary application of this probe was also carried out and satisfactory results were shown.
研究领域:
化学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Likang Fu,Shixing Wang,Guo Lin,Libo Zhang,Qiming Liu,Houhuang Zhou,Chenxia Kang,Shuyun Wan,Hongwei Li,Sheng Wen
A new metal organic framework UiO-66-RSA (UiO-66 with hydroxyl) was prepared by the post-modification of UiO-66-NH 2 (UiO-66 with amino) with resorcyl aldehyde and was employed for the efficient and selective separation and removal of Pb(II) in aqueous media . The maximum adsorption amount of UiO-66-RSA was 189.8 mg/g at an optimal pH of 4. The adsorption isotherm and kinetic were well described by Langmuir/Dubinin-Radushkevich and pseudo-second-order models respectively. Adsorption process was monolayer chemisorption . UiO-66-RSA was regenerated by thiourea/nitric acid and the removal rate was only decreased by 3.7% after five successive cycles. The analysis of X-ray photoelectron spectroscopy suggested the adsorption mechanism lay on the complexation reaction between hydroxyl/nitrogen-containing groups and Pb(II). The UiO-66-RSA bound Pb(II) by forming double/quadri coordinated complexes. Compared with a multitude of usual metal ions , viz., Zn(II), Co(IV), Ni(II), Mg(II), Cd(II), Cu(II) and Ca(II), the Pb(II) could be absorbed selectively by UiO-66-RSA. The results indicated that the UiO-66-RSA sorbent could be of great potential in the removal of Pb(II) from aqueous solutions.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jinguo Wang,Zimei Chen,Guangjun Zhai,Yong Men
Developing metal oxides with tailored surface oxygen vacancies is very important for heterogeneous photocatalysis. In this work, uniform WO 3 nanorods with tailored surface oxygen vacancies were prepared by a facile hydrothermal route, which exhibited highly enhanced photocatalytic activity for selective oxidation of alcohols to corresponding ketones in water medium. The physicochemical structural properties of uniform WO 3 nanorods have been characterized and correlated with their photocatalytic activities. Results indicated that the enhanced photocatalytic activity of uniform WO 3 nanorods was ascribed to the synergistic effect of the following three aspects: firstly, the high surface area favored the adsorption and diffusion of alcohol molecules; secondly, the small crystallite size shortened the transfer distance of photoelectrons and thus facilitated the fast transfer of photoelectrons, thereby restrained the recombination rate of photoelectron-hole pairs; finally, the surface oxygen vacancies acted as the photoelectron sinks could capture photoelectrons and promote their separation from holes. Meanwhile, the uniform WO 3 nanorods also demonstrated good stability owning to its stable crystal phase and robust morphological structure.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Zhenghong Zhou,Kangfei Hu,Jiawei Wang,Zhibin Li,Yan Zhang,Zhenggen Zha,Zhiyong Wang
An electrochemical synthesis for quinazolines and quinazolinones was developed via a C(sp3)-H amination/C-N cleavage by virtue of the anodic oxidation. The reaction can be carried out in aqueous media under mild conditions to afford the desired products with high yields. The reaction mechanism was proposed after detailed investigation.
研究领域:
有机化学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）