RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 45
·期 5
·2587-2603
·
IF 2.064
Liu Xueting,Zhu Hongcheng,Wu Jingjing,Wang Fang,Wei Fengyu
Abstract Sulfonated polystyrene microspheres have been used as a template to produce a mesoporous polyaniline (M-PANI) spherical shell with open pores, based on which a novel visible-light-active AgI-modified M-PANI@AgI composite was prepared by a chemisorption method. The photocatalytic activity of M-PANI@AgI was significantly enhanced as compared to conventional PANI@AgI, and it increased with the increasing proportion of M-PANI. Superior stability was also observed in the cyclic runs, indicating that the as-prepared composite is highly desirable for the remediation of organic contaminated wastewaters. The improved photocatalytic performance is due to synergistic effects derived from the AgI-modified mesoporous PANI spherical shell with open pores, which can effectively accelerate the charge separation and reinforce the photostability of the composite. In addition, based on active species trapping experiments, a possible mechanism has been proposed. Graphical abstract
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-11
·
IF 3.159
Qi Feng,Liu Ruizhen
Integrating multiple tumor therapy functions into one nanoplatform has been a new tumor therapy strategy in recent years. Herein, a dual-modality therapy agent consisting of molybdenum selenide nanodots (MoSe 2 NDs) and bovine serum albumin (BSA) assembled nanospheres (MoSe 2 @BSA NSs) was successfully synthesized. After conjugation of folic acid (FA) molecules via polyethylene glycol (PEG) “bridges,” the FA-MoSe 2 @BSA NSs were equipped with tumor-targeting function. The BSA and PEG modifications provided the unstable MoSe 2 NDs with excellent physiological stability. Since the end-product FA-MoSe 2 @BSA NSs had strong near-infrared (NIR) and X-ray absorbance properties, they exhibited good photothermal properties with excellent photothermal stability and radio-sensitization ability, hence, were explored as photothermal radiotherapy agents. In vitro and in vivo experiments indicated that the FA-MoSe 2 @BSA NSs possessed highly efficient tumor-targeting effect, great biocompability, and synergistic photothermal radiotherapy effect. This work suggests that such biocompatible FA-MoSe 2 @BSA NSs may be a promising multifunctional dual-modality tumor therapy agent for use in combination tumor therapy.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 18
·9889-9899
·
IF 3.917
Tian Peixiu,Liu Mingsheng,Wan Caiyan,Zhang Guangxian,Zhang Fengxiu
Abstract A flame retardant ammonium salt of diethylene glycol phosphonate (ADGP) is synthesized using low-cost materials (diethylene glycol, phosphoric acid, and urea). The flame retardant is grafted on the cotton fabrics via P–O–C covalent bonds. The structure of the flame retardant is characterized by nuclear magnetic resonance (NMR) and Fourier transform infrared (FT-IR). The combustion performance of the treated and untreated cotton fabrics is evaluated based on vertical flammability, limiting oxygen index (LOI), and cone calorimetry. As the concentration of the flame-retardant ADGP increased, the cotton fabric treated with 40% ADGP exhibited an LOI of 43.7% and superior fire resistance, whereas physiological comfort showed a decrease. Scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction were used to characterize the surface morphology, chemical composition, and crystal structure of the control and treated cotton fabrics. The thermal stability of the treated and untreated cotton fabrics is determined by thermogravimetric analysis. The results indicated that the treated cotton showed superior flame retardancy. Graphic abstract
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 9
·1-9
·
IF 5.479
Wu Jia,Li Zhenqun,Jia Li
A method is presented for chiral separation of catecholamines present in bovine and mice blood. It combines magnetic solid phase extraction (MSPE) and chiral capillary electrophoresis (ch-CE). A copolymer consisting of poly(3,4-dihydroxyphenylalanine) and polyethyleneimine was coated onto magnetic particles (MPs) by co-deposition using the CuSO 4 /H 2 O 2 system as a polymerization initiator. The coated MPs are spherical and the average diameter is about 168 ± 4 nm. The thickness of the coating is approximately 19 nm. The functional MPs are used as sorbents in MSPE to simultaneously extract the catecholamines epinephrine, norepinephrine and isoprenaline. Under the optimum conditions, the extraction efficiencies for those catecholamines are in the range from 92.3 to 98.3%, with relative standard deviations (RSDs) of <5.3%. The extraction can be performed within 4 min. The extracts were then submitted to ch-CE. A method for field-enhanced sample injection (FESI) was used to enhance the detection sensitivities of the enantiomers. The limits of detection for catecholamine enantiomers range from 400 to 600 pg mL −1 . In comparison with the FESI-ch-CE method, the sensitivity enhancement factors of the MSPE/ch-CE method for catecholamines are about 10-fold. The method was applied to the determination of trace levels of catecholamine enantiomers in (spiked) bovine and mice blood. The recoveries ranged from 88.2 to 93.8%, with RSDs of <5.5%. The whole detection procedure takes less than 30 min.
Schematic representation of the separation and detection of catecholamine enantiomers in blood by combination of polyDOPA/PEI-magnetic particles-based solid phase extraction and chiral-capillary electrophoresis.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 9
·1-10
·
IF 5.479
Zhao Shiyuan,Yu Tao,Du Yingxiang,Sun Xiaodong,Feng Zijie,Ma Xiaofei,Ding Wen,Chen Cheng
The preparation of an organic polymer monolithic column modified with an amino acid ionic liquid and graphene oxide (AAIL-GO) and its application to capillary electrochromatography (CEC) was described. The AAIL tetramethylammonium-L-arginine was bonded to a monolithic column that was previously modified with graphene oxide by using an hydrochloride/N-hydroxysuccinimide coupling reaction. The morphology of a poly(glycidyl methacrylate-co-ethylene dimethacrylate) monolith was examined by scanning electron microscopy. The incorporation of AAIL and graphene oxide was detected by infrared spectroscopy and elemental analysis. The resulting monolithic column produced a strong and stable electroosmotic flow from the anode to the cathode in the pH range from 3 to 9. Compared with a column modified with AAIL or graphene oxide only, the AAIL-GO-modified column has a better separation ability for amino acids, β-blockers, and nucleotides (the resolution of three amino acids: 2.231 and 2.036, β-blockers: 2.779 and 2.470 and nucleotides: 8.345 and 3.321). Molecular modeling was applied to demonstrate the separation mechanism of small molecules which showed a good support for experimental results.
Schematic representation of capillary electrochromatography (CEC) systems with an amino acid ionic liquid-graphene oxide modified organic polymer monolithic column as stationary phases for separation of amino acids, β-blockers, and nucleotides.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 33
·34345-34356
·
IF 2.914
Liu Lili,Chen Xin,Wang Zhiping,Lin Sen
Fluoroquinolones (FQs) occur broadly in natural media due to its extensive use, and it has systematic effects on our ecosystem and human immunity. In this study, long-root Eichhornia crassipes was reclaimed as a multi-functional activated carbon (MFAC) to remove fluoroquinolones (FQs) from contaminated water. To get insight into the adsorption mechanism, multiple measurements, including FTIR and XPS analyses, were employed to investigate the adsorption processes of ciprofloxacin and norfloxacin as well as the experiments of effect of exogenous factors on adsorption performances. The results confirmed that the adsorption of FQs by MFAC was mainly attributed to the electrostatic interaction, hydrogen bond interaction, and electronic-donor-acceptor (EDA) interaction. In addition, the kinetics and thermodynamics experiments demonstrated that the MFAC possessed great adsorption performance for FQs. According to the Langmuir model, the saturated adsorption capacities exceeded 145.0 mg/g and 135.1 mg/g for CIP and NOR at 303.15 K, respectively. The column experiments were conducted to explore the application performance of MFAC on the advanced treatment of synthetic water at different flow rates and bed depths. The adsorption capacity of CIP on MFAC was estimated by the Thomas models and the bed-depth service time (BDST) models, reaching 127.56 mg/g and 11,999.52 mg/L, respectively. These results also provide a valid approach for the resource recycling of the redundant long-root Eichhornia crassipes plants.
Graphical abstract
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Journal of Coatings Technology and Research
·
2019
·Vol. 17
·期 1
·171-180
·
IF 1.584
Li Jing,Shan Wenwen,Cui Jincan,Qiu Hanxun,Yang Guangzhi,Zheng Shiyou,Yang Junhe
Polyetheramine (D230), an epoxy curing agent, was grafted on graphene oxide (GO) surfaces, which can be stably dispersed in a waterborne curing agent for more than 8 months. Waterborne epoxy coatings reinforced by D230-functionalized GO (DGO) were prepared on carbon steel surfaces. According to the electrochemical impedance spectra, the impedance modulus at 0.1 Hz remained at 2.2 × 10 9 Ω after 150 days of immersion in 3.5% NaCl electrolytes for 0.2 wt% DGO-reinforced waterborne epoxy coatings, while that of the neat epoxy coatings dropped below 1 × 10 7 Ω after 10 days. Besides, the addition of DGO enhanced the weathering resistance of waterborne epoxy coatings. After 60 days of the UV aging test, the yellow color index of neat epoxy coatings was 1.6 times that of 0.5 wt% DGO/epoxy coatings. The residual pencil hardness of the 0.5 wt% DGO/epoxy coatings was three levels higher than that of neat epoxy coatings.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2018
·Vol. 20
·期 2
·1-12
·
IF 2.127
Ma Lan,He Yi,Luo Pingya,Zhang Liyun,Yu Yalu
Nanoparticles have been known as the useful materials in working fluids for petroleum industry. But the stabilization of nano-scaled materials in water-based working fluids at high salinities is still a big challenge. In this study, we successfully prepared the anionic polymer/multi-walled carbon nanotubes (MWNTs) composites by covalently wrapping of MWNTs with poly (sodium 4-styrenesulfonate) (PSS) to improve the stability of MWNTs in high concentration electrolytes. The PSS/MWNTs composites can automatically disperse in salinity up to 15 wt% NaCl and API brines (8 wt% NaCl + 2 wt% CaCl 2 ). Hydrodynamic diameters of composites were measured as a function of ionic strength and API brines by dynamic light scattering (DLS). By varying the concentration of brines, hydrodynamic diameter of PSS/MWNTs composites in brines fluctuated between 545 ± 110 nm for 14 days and 673 ± 171 nm for 30 days. Above results showed that PSS/MWNTs could be well stable in high salts solutions for a long period of time. After wrapped with PSS, the diameters of nanotubes changed from 30 ~ 40 to ~ 430 nm, the thickness of wrapped polymer is about ~ 400 nm by analysis of morphologies. The zeta potentials of PSS/MWNTs composites in various salinity of brines kept at approximately − 41 ~ − 52 mV. Therefore, the well dispersion of PSS/MWNTs in high salinity is due to large negative charges of poly (sodium 4-styrenesulfonate), which provide enough electrostatic repulsion and steric repulsion to hinder compression of electric double layer caused by high concentration electrolytes.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 3
·1-9
·
IF 5.705
Zhang Kai,Gan Ning,Hu Futao,Chen Xixue,Li Tianhua,Cao Jinxuan
The authors describe an enzyme-free aptamer-based assay for the determination of the model antibiotic kanamycin (Kana). The method is making use of (a) microfluidic chip electrophoresis; (b) a stirring bar carrying a gold-labeled aptamer probe, and (c) the hybridization chain reaction (HCR) for signal amplification. Firstly, a stirring bar (length: 1 cm; diameter: 0.2 mm) was modified with a large amount of duplex DNA and then hybridized with aptamer and its partially complementary chains (cDNA). In the presence of Kana, the binding between the Kana and aptamer unwinds the duplex structures and releases a corresponding amount of cDNA into the supernatant. The released cDNA triggers the HCR in the presence of H1 and H2 DNA hairpin to produce a large amount of duplex DNA chains with different lengths. At the same time, the amounts of H1 and H2 are reduced. The decreased signal of H1/H2 after several HCR cycles can be used to quantify kana in the 1 pg·mL −1 to 10 ng·mL −1 , with a detection limit of 0.29 pg·mL −1 . The signal is generated by reading the fluorescence, best at excitation/emission maxima of 470/525 nm. The whole detection process takes 3 min only. The assay was employed to the detection of Kana in spiked milk and fish samples. Results are consistent with those of an enzyme linked immunosorbent assay. The assay has high throughput, high selectivity, and high amplification capability.
Schematic of a stirring bar functionalized with gold-labeled aptamer acting as the capture probe. It can capture the target and release primer simultaneously. The primer triggers the hybridization chain reaction inducing the consumption of H1 and H2. After a certain reaction time, the mixture is injected into the MCE platform for microfluidic electrophoretic separation and fluorometric detection.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2018
·Vol. 229
·期 3
·1-10
·
IF 1.769
Yi Yunqiang,Wu Juan,Wei Yufen,Fang Zhanqiang,Gong Yanyan,Zhao Dongye
Ni/Fe bimetallic nanoparticles have been widely used as strong reductants to degrade organic pollutants. Synthesis parameters of Ni/Fe nanoparticles can directly affect their characteristics and reactivity. In this study, Ni/Fe nanoparticles were prepared at different synthesis conditions, namely, synthesizing temperature, stirring rate, washing solutions, and preparation methods (post-coated and co-reducted Ni/Fe nanoparticles), and investigated their effectiveness of decabrominated diphenyl ether (BDE209) degradation. The results showed that the successive order of factors affecting the kinetics constant of Ni/Fe nanoparticles for the removal of decabrominated diphenyl ether (BDE209) were preparation methods, washing solutions, stirring rate, and synthesis temperature. It should be noted that the kinetics constants of post-coated Ni/Fe nanoparticles for removal of BDE209 was 0.049 min −1 , which was 14 times higher than that of co-reducted Ni/Fe nanoparticles. Moreover, the most remarkable influence on the particle size of Ni/Fe nanoparticles was the stirring rate, others synthesis conditions are mentioned in the following order: washing solutions > preparation methods > synthesis temperature. Interestingly, the effects of synthesis condition on the crystalline structure of Ni/Fe were weak. The results may facilitate more effective application of Ni/Fe nanoparticles for degradation of BDE209.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 3
·1-10
·
IF 5.705
Wang Yan,Bian Feng,Qin Xiaofei,Wang Qianqian
A visible-light driven photoelectrochemical (PEC) aptasensor is described that is capable of detecting chloramphenicol (CAP). It is based on the use of a TiO 2 based nanorod array (NRA) sensitized with Eu(III)-doped CdS quantum dots. The NRA absorbs visible-light and while strongly depressing the recombination of photogenerated charges, thereby improving photo-to-current conversion efficiency. The introduction of Eu(III) ions promotes the charge transformation and utilization, and this results in a further increase of photocurrent. The NRA was employed as the photoactive material for the fabrication of a PEC aptasensor. CAP-binding aptamers were immobilized on a fluorine-doped tin oxide (FTO) electrode that was modified with the NRA. The aptasensor was applied to the determination of CAP by monitoring the decrease in photocurrent (at a typical voltage of 0 V) that is caused by the formation of the aptamer-CAP complex. Under optimal conditions, the response is linear in the 1.0 pM to 3.0 nM CAP concentration range, with a detection limit of 0.36 pM (at S/ N = 3). The method was applied to the determination of CAP in spiked milk samples where it gave satisfactory results.
Schematic presentation of the fabrication of a visible-light driven photoelectrochemical aptasensor based on the use of a TiO 2 nanorod array sensitized with Eu(III)-doped CdS quantum dots. It was applied to the determination of chloramphenicol with good selectivity and high sensitivity. TiO 2 NRA: TiO 2 nanorod array; FTO: fluorine-doped tin oxide; CdS:Eu 3+ QDs: Eu(III)-doped CdS quantum dots; BSA: bovine serum albumin; CAP: chloramphenicol
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JOURNAL OF CHEMICAL SCIENCES
·
2018
·Vol. 130
·期 1
·1-11
·
IF 1.254
Lin Hongyan,Lin Jiafeng,Zhao Jing,Tian Yuan,Wang Xiang,Liu Guocheng
Abstract Three new cadmium(II) coordination compounds \([\hbox {Cd}_{2} (\hbox {L})_{2} (\hbox {btec}) (\hbox {H}_{2} \hbox {O})_{2}] \cdot \hbox {3H}_{2} \hbox {O}\) ( 1 ), [Cd(HL)(btb)] ( 2 ) and \([\hbox {Cd}(\hbox {L})(\hbox {pda})] \cdot \hbox {2H}_{2} \hbox {O}\) ( 3 ) were prepared by hydrothermal reactions of cadmium(II) chloride with ligands L ( \(\hbox {L} = \hbox {N}\) , \(\hbox {N}^{\prime }\) -bis(3-pyridyl)octandiamide) in the presence of different aromatic polycarboxylates ( \(\hbox {H}_{4} \hbox {btec} = \hbox {1,2,4,5-benzenetetracarboxylic acid}\) , \(\hbox {H}_{3} \hbox {btb} = \hbox {1,3,5-tri(4-carboxylphenyl)benzene}\) , \(\hbox {H}_{2} \hbox {pda} = \hbox {1,4-phenylenediacetic acid}\) ). The structures of compounds 1 – 3 have been determined by X-ray single crystal diffraction analyses and further characterized by infrared spectroscopy (IR), powder X-ray diffraction (PXRD) and thermogravimetric (TG) analyses. Compound 1 displays a 3D metal-organic framework with (4,4,4)-connected \(\{6^{2}.8^{4}\} \{6^{3}.8^{3}\} \{6^{4}.8^{2}\}\) topology constructed from 2D \([\hbox {Cd}_{2} (\hbox {btec})]_{\mathrm{n}}\) layers and \(\mu _{2}\) -bridging L ligands. Compound 2 is a 3D (3,3)-connected \(\{10^{3}\}\) topological network based on the 3D \([\hbox {Cd(btb)}]_{\mathrm{n}}^{\mathrm{n}-}\) framework and the protonated monodentate HL ligand. Compound 3 shows a 2D layer with (3,5)-connected \((4^{2} \cdot 6^{7} \cdot 8)(4^{2} \cdot 6)\) topological structure, which are further linked by hydrogen bonding interactions to form a 3D supramolecular network. The influences of three aromatic polycarboxylates on the structures of title compounds are investigated. Further, the fluorescent properties of three cadmium(II) compounds and their fluorescent sensing properties towards small solvent molecules and metal cations have been studied.
Graphical Abstract
Three new Cd(II) coordination compounds based on the flexible bis(pyridyl)-bis(amide) ligand and three different polycarboxylates have been hydrothermally synthesized. The polycarboxylates with diverse carboxyl groups and various structures play an important role in constructing three Cd(II) compounds. The thermal stabilities, fluorescent and fluorescence sensing properties of the three Cd(II) compounds towards small solvent molecules and metal cations have been reported.
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